US20030205461A1 - Removable modular cell for electro-chemical plating - Google Patents
Removable modular cell for electro-chemical plating Download PDFInfo
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- US20030205461A1 US20030205461A1 US10/429,684 US42968403A US2003205461A1 US 20030205461 A1 US20030205461 A1 US 20030205461A1 US 42968403 A US42968403 A US 42968403A US 2003205461 A1 US2003205461 A1 US 2003205461A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
- H01L21/67161—Apparatus for manufacturing or treating in a plurality of work-stations characterized by the layout of the process chambers
- H01L21/67167—Apparatus for manufacturing or treating in a plurality of work-stations characterized by the layout of the process chambers surrounding a central transfer chamber
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/001—Apparatus specially adapted for electrolytic coating of wafers, e.g. semiconductors or solar cells
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/004—Sealing devices
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/12—Semiconductors
- C25D7/123—Semiconductors first coated with a seed layer or a conductive layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
- H01L21/67051—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing using mainly spraying means, e.g. nozzles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67075—Apparatus for fluid treatment for etching for wet etching
- H01L21/6708—Apparatus for fluid treatment for etching for wet etching using mainly spraying means, e.g. nozzles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67126—Apparatus for sealing, encapsulating, glassing, decapsulating or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
- H01L21/6719—Apparatus for manufacturing or treating in a plurality of work-stations characterized by the construction of the processing chambers, e.g. modular processing chambers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
- H01L21/67207—Apparatus for manufacturing or treating in a plurality of work-stations comprising a chamber adapted to a particular process
- H01L21/6723—Apparatus for manufacturing or treating in a plurality of work-stations comprising a chamber adapted to a particular process comprising at least one plating chamber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/288—Deposition of conductive or insulating materials for electrodes conducting electric current from a liquid, e.g. electrolytic deposition
- H01L21/2885—Deposition of conductive or insulating materials for electrodes conducting electric current from a liquid, e.g. electrolytic deposition using an external electrical current, i.e. electro-deposition
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/241—Reinforcing the conductive pattern characterised by the electroplating method; means therefor, e.g. baths or apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
Definitions
- the present invention generally relates to deposition of a metal layer onto a substrate. More particularly, the present invention relates to a modular cell to be used within an electrochemical deposition or electroplating system.
- Electroplating has been previously limited in integrated circuit design to the fabrication of lines on circuit boards. Electroplating is now used to deposit metals (such as copper) such as on a seed layer contained within features (e.g., vias, trenches, or contacts) and over the fields surrounding these features.
- metals such as copper
- One feature filling embodiment that utilizes electroplating requires initially depositing a diffusion barrier layer on the substrate. A seed layer is deposited (typically by physical vapor deposition) to form a plating surface on the substrate. Metal is then deposited by electroplating on the seed layer on the substrate. The seed layer is typically formed from the same metal as the subsequently electroplated metal, so the deposited seed layer becomes contiguous with the deposited metal. Finally, the deposited metal can be planarized by another process, e.g., chemical mechanical polishing (CMP), to define the conductive interconnect feature.
- CMP chemical mechanical polishing
- Electroplating is performed by establishing a voltage/current level between the seed layer on the substrate and a separate anode (both the seed layer and the substrate are contained within the conductive electrolyte solution) to deposit metal ions on the layer to form the deposited metal.
- the resulting positive metal ions (for example Cu + ) are attracted to, and deposited on, the negatively charged substrate surface.
- Electroplating is performed in electrolyte cells that normally have an opening, and which are filled with electrolyte solution.
- Electrolyte cells comprise an anode, a controller, and an associated substrate holder.
- the substrate holder secures a substrate in a position so the substrate can be inserted through the opening, and the substrate seed layer is immersed in the electrolyte solution.
- the anode is also positioned in the electrolyte solution within the electrolyte cell.
- An electric current/voltage is established through the electrolyte solution between the anode and the seed layer on the substrate.
- the electrolyte solution contains the metal ions that are deposited on the substrate seed layer to form the metal film during the electroplating process.
- the electrolyte cells need to be maintained and/or repaired occasionally.
- the anode chemically reacts with the electrolyte solution when immersed therein, and the chemical reaction disperses metal ions, such as copper sulfate (that can be electrically dissociated into distinct copper and sulfate ions).
- the chemical reaction between the anode and the electrolyte solution also degrades the anode and causes the anode to be irregularly-shaped.
- the shape of the anode also can affect the shape of the electromagnetic field generated between the anode and the seed layer. An irregularly shaped electric field results in uneven deposition of metal across the surface of the seed layer during the electroplating process. When the anodes become overly worn, they must be replaced to maintain uniformity of deposition across the substrate seed layer.
- the electrolyte cell is removed from the electroplating system during maintenance and/or repair.
- the electrolyte solution is removed from the electrolyte cell and the electrolyte cell is removed from its mount. Accordingly, the electroplating system is unusable during repair of the cell, thereby resulting in loss of production and increased cost of operation of the electroplating system.
- the present invention generally provides a method and apparatus for depositing metal on a substrate.
- One embodiment of method for removing a modular metal deposition cell from a deposition cell mount comprises unfastening a fastener that secures a cell top to a cell bottom, and also fastens the cell top and the cell bottom to the deposition cell mount. The cell top or the cell bottom are removed from the deposition cell mount.
- FIG. 1 is a simplified cross sectional view of a typical fountain plater incorporating contacts
- FIG. 2 is a perspective view of one embodiment of an electroplating system platform
- FIG. 3 is a schematic view of one embodiment of an electroplating system platform
- FIG. 4 is a schematic perspective view of one embodiment of a spin-rinse-dry-(SRD) module, incorporating rinsing and dissolving fluid inlets;
- FIG. 5 is a side cross sectional view of the spin-rinse-dry (SRD) module of FIG. 4 and shows a substrate in a processing position vertically disposed between fluid inlets;
- SRD spin-rinse-dry
- FIG. 6 is a cross sectional view of one embodiment of an electroplating process cell
- FIG. 7 is a partial cross sectional perspective view of a cathode contact ring
- FIG. 8 is a cross sectional perspective view of the cathode contact ring showing an alternative embodiment of the contact pads
- FIG. 9 is a cross sectional perspective view of the cathode contact ring showing an alternative embodiment of the contact pads and an isolation gasket;
- FIG. 10 is a cross sectional perspective view of the cathode contact ring showing the isolation gasket
- FIG. 11 is a simplified schematic diagram of the electrical circuit representing the electroplating system through each contact
- FIG. 12 is a cross sectional view of one embodiment of a substrate assembly
- FIG. 12A is an enlarged cross sectional view of the bladder area of FIG. 12;
- FIG. 13 is a partial cross sectional view of a substrate holder plate
- FIG. 14 is a partial cross sectional view of a manifold
- FIG. 15 is a partial cross sectional view of a bladder
- FIG. 16 is a schematic diagram of an electrolyte solution replenishing system
- FIG. 17 is a cross sectional view of a rapid thermal anneal chamber
- FIG. 18 is a perspective view of an alternative embodiment of a cathode contact ring
- FIG. 19 is a partial cross sectional view of an alternative embodiment of a substrate holder assembly
- FIG. 20 is a cross sectional view of a first embodiment of an encapsulated anode
- FIG. 21 is a cross sectional view of a second embodiment of an encapsulated anode
- FIG. 22 is a cross sectional view of a third embodiment of an encapsulated anode
- FIG. 23 is a cross sectional view of a fourth embodiment of an encapsulated anode
- FIG. 24 is a top schematic view of a mainframe transfer robot having a flipper robot incorporated therein;
- FIG. 25 is an alternative embodiment of the process head assembly having a rotatable head assembly
- FIGS. 26 a and 26 b are cross sectional views of embodiments of a degasser module
- FIG. 27 is a perspective cross sectional view of one embodiment of a removable modular cell having a segment broken away.
- FIG. 28 is a top view of one embodiment of electroplating system including the removable modular cell of FIG. 27.
- a removable modular cell to be used in an electroplating device is described.
- One embodiment of electroplating device that contains the removable modular cell is described in detail.
- the structure and operation of the removable modular cell is also described.
- FIG. 1 shows one embodiment of fountain plater 10 used in electroplating.
- the fountain plater 10 includes an electrolyte cell 12 , a substrate holder 14 , an anode 16 , and a contact ring 20 .
- the electrolyte cell 12 contains electrolyte solution, and the electrolyte cell has a top opening 21 circumferentially defined by the contact ring 20 .
- the substrate holder 14 is disposed above the electrolyte cell, and is capable of displacing the substrate to be immersed into, and out of, the electrolyte solution. The substrate holder enters, and is removed from, the electrolyte solution, through the top opening of the electrolyte cell.
- the substrate holder 14 is also capable of securing and positioning the substrate in a desired position within the electrolyte solution during processing.
- the contact ring 20 comprises a plurality of metal or metal alloy electrical contacts that electrically contact the seed layer on the substrate.
- a controller 23 is electrically connected to the contacts and to the anode, and the controller provides an electrical current to the substrate when the seed layer on the substrate is being plated. The controller thereby determines the electrical current/voltage established across from the anode to the seed layer on the substrate.
- FIG. 2 is a perspective view of one embodiment of an electroplating system platform 200 .
- FIG. 3 is a top schematic view of the electroplating system platform 200 shown in FIG. 2.
- the electroplating system platform 200 generally comprises a loading station 210 , a thermal anneal chamber 211 , a spin-rinse-dry (SRD) station 212 , a mainframe 214 , and an electrolyte solution replenishing system 220 .
- the electroplating system platform 200 is enclosed in a clean environment using panels such as PLEXIGLAS® (a registered trademark of the Rohm and Haas Company, West Philadelphia, Pa.).
- the mainframe 214 generally comprises a mainframe transfer station 216 and a plurality of processing stations 218 . Each processing station 218 includes one or more process cells 240 .
- An electrolyte solution replenishing system 220 is positioned adjacent the electroplating system platform 200 and connected to the process cells 240 individually to circulate electrolyte solution used for the electroplating process.
- the electroplating system platform 200 also includes a controller 222 , typically comprising a programmable microprocessor.
- the controller 222 comprises a central processing unit (CPU) 260 , memory 262 , circuit portion 265 , input output interface (I/O) 279 , and bus (not shown).
- the controller 222 may be a general-purpose computer, a microprocessor, a microcontroller, or any other known suitable type of computer or controller.
- the CPU 260 performs the processing and arithmetic operations for the controller 222 .
- the controller 222 controls the processing, robotic operations, timing, etc. associated with the electroplating system platform 200 .
- the controller controls the voltage applied to the anode 16 , the plating surface 15 of the substrate 22 , and the operation of the substrate holder assembly 450 as shown in FIG. 6.
- the memory 262 includes random access memory (RAM) and read only memory (ROM) that together store the computer programs, operands, operators, dimensional values, system processing temperatures and configurations, and other parameters that control the electroplating operation.
- RAM random access memory
- ROM read only memory
- the bus provides for digital information transmissions between CPU 260 , circuit portion 265 , memory 262 , and I/O 279 .
- the bus also connects I/O 279 to the portions of the electrochemical deposition (ECD) system 200 that either receive digital information from, or transmit digital information to, controller 222 .
- ECD electrochemical deposition
- I/O 279 provides an interface to control the transmissions of digital information between each of the components in controller 222 .
- I/O 279 also provides an interface between the components of the controller 222 and different portions of the ECD system 200 .
- Circuit portion 265 comprises all of the other user interface devices (such as display and keyboard).
- the term “substrate” is intended to describe substrates, wafers, or other objects that can be processed within the electroplating system platform 200 .
- the substrates are generally cylindrical or rectangular in configuration, and may include such irregularities as notches or flatted surfaces that assist in processing.
- the loading station 210 preferably includes one or more substrate cassette receiving areas 224 , one or more loading station transfer robots 228 and at least one substrate orientor 230 .
- the number of substrate cassette receiving areas, loading station transfer robots 228 and substrate orientor included in the loading station 210 can be configured according to the desired throughput of the system. As shown for one embodiment in FIGS.
- the loading station 210 includes two substrate cassette receiving areas 224 , two loading station transfer robots 228 and one substrate orientor 230 .
- a substrate cassette 232 containing substrates 234 is loaded onto the substrate cassette receiving area 224 to introduce substrates 234 into the electroplating system platform.
- the loading station transfer robot 228 transfers substrates 234 between the substrate cassette 232 and the substrate orientor 230 .
- the loading station transfer robot 228 comprises a typical transfer robot commonly known in the art.
- the substrate orientor 230 positions each substrate 234 in a desired orientation to ensure that the substrate is properly processed.
- the loading station transfer robot 228 also transfers substrates 234 between the loading station 210 and the SRD station 212 and between the loading station 210 and the thermal anneal chamber 211 .
- FIG. 4 is a schematic perspective view of one embodiment of a spin-rinse-dry (SRD) module, incorporating rinsing and dissolving fluid inlets.
- FIG. 5 is a side cross sectional view of the spin-rinse-dry (SRD) module of FIG. 4 and shows a substrate in a processing position vertically disposed between fluid inlets.
- the SRD station 212 includes one or more SRD modules 236 and one or more substrate pass-through cassettes 238 .
- the SRD station 212 includes two SRD modules 236 corresponding to the number of loading station transfer robots 228 , and a substrate pass-through cassette 238 is positioned above each SRD module 236 .
- the substrate pass-through cassette 238 facilitates substrate transfer between the loading station 210 and the mainframe 214 .
- the substrate pass-through cassette 238 provides access to and from both the loading station transfer robot 228 and a robot in the mainframe transfer station 216 .
- the SRD module 236 comprises a bottom 330 a and a sidewall 330 b , and an upper shield 330 c which collectively define a SRD module bowl 330 d , where the shield attaches to the sidewall and assists in retaining the fluids within the SRD module.
- a pedestal 336 located in the SRD module, includes a pedestal support 332 and a pedestal actuator 334 .
- the pedestal 336 supports the substrate 338 (shown in FIG. 5) on the pedestal upper surface during processing.
- the pedestal actuator 334 rotates the pedestal to spin the substrate and raises and lowers the pedestal as described below.
- the substrate may be held in place on the pedestal by a plurality of clamps 337 .
- the clamps pivot with centrifugal force and engage the substrate preferably in the edge exclusion zone of the substrate. In one embodiment, the clamps engage the substrate only when the substrate lifts off the pedestal during the processing. Vacuum passages (not shown) may also be used as well as other holding elements.
- the pedestal has a plurality of pedestal arms 336 a and 336 b , so that the fluid through the second nozzle may impact as much surface area on the lower surface on the substrate as is practical.
- An outlet 339 allows fluid to be removed from the SRD module.
- a first conduit 346 through which a first fluid 347 flows, is connected to a valve 347 a .
- the conduit 346 may be hose, pipe, tube, or other fluid containing conduits.
- the valve 347 a controls the flow of the first fluid 347 and may be selected from a variety of valves including a needle, globe, butterfly, or other valve types and may include a valve actuator, such as a solenoid, that can be controlled with a controller 362 .
- the conduit 346 connects to a first fluid inlet 340 that is located above the substrate and includes a mounting portion 342 to attach to the SRD module and a connecting portion 344 to attach to the conduit 346 .
- the first fluid inlet is shown with a single first nozzle 348 to deliver the first fluid 347 under pressure onto the substrate upper surface.
- multiple nozzles could be used and multiple fluid inlets could be positioned about the inner perimeter of the SRD module.
- nozzles placed above the substrate should be outside the diameter of the substrate to lessen the risk of the nozzles dripping on the substrate.
- the first fluid inlet 340 could be mounted in a variety of locations, including through a cover positioned above the substrate.
- the nozzle 348 may articulate to a variety of positions using an articulating member 343 , such as a ball and socket joint.
- a second conduit 352 is connected to a control valve 349 a and a second fluid inlet 350 with a second nozzle 351 .
- the second fluid inlet 350 is shown below the substrate and angled upward to direct a second fluid under the substrate through the second nozzle 351 .
- the second fluid inlet may include a plurality of nozzles, a plurality of fluid inlets and mounting locations, and a plurality of orientations including using the articulating member 353 .
- Each fluid inlet could be extended into the SRD module at a variety of positions. For instance, if the flow is desired to be a certain angle that is directed back toward the SRD module periphery along the edge of the substrate.
- the nozzles can be extended radially outward and the discharge from the nozzles be directed back toward the SRD module periphery.
- the controller 222 could individually control the two fluids and their respective flow rates, pressure, and timing, and any associated valving, as well as the spin cycle(s).
- the controller could be remotely located, for instance, in a control panel or control room and the plumbing controlled with remote actuators.
- An alternative embodiment, shown in dashed lines, provides an auxiliary fluid inlet 346 a connected to the first conduit 346 with a conduit 346 b and having a control valve 346 c.
- the alternate embodiment may be used to flow a rinsing fluid on the backside of the substrate after the dissolving fluid is applied. the rinsing fluid may be applied without having to reorient the substrate or switch the flow through the second fluid inlet to a rinsing fluid.
- the substrate is mounted with the deposition surface of the disposed face up in the SRD module bowl.
- the first fluid inlet would generally flow a rinsing fluid, typically deionized water or alcohol. Consequently, the backside of the substrate would be mounted facing down and a fluid flowing through the second fluid inlet would be a dissolving fluid, such as an acid, including hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, or other dissolving liquids or fluids, depending on the material to be dissolved.
- the first fluid and the second fluid are both rinsing fluids, such as deionized water or alcohol, when the desired process is to rinse the processed substrate.
- the pedestal is in a raised position, shown in FIG. 4, and a robot (not shown) places the substrate, front side up, onto the pedestal.
- the pedestal lowers the substrate to a processing position where the substrate is vertically disposed between the first and the second fluid inlets.
- the pedestal actuator rotates the pedestal between about 5 to about 5000 rpm, with a typical range between about 20 to about 2000 rpm for a 200 mm substrate.
- the rotation causes the lower end 337 a of the clamps to rotate outward about pivot 337 b , toward the periphery of the SRD module sidewall, due to centrifugal force.
- the clamp rotation forces the upper end 337 c of the clamp inward and downward to center and hold the substrate 338 in position on the pedestal 336 , preferably along the substrate edge.
- the clamps may rotate into position without touching the substrate and hold the substrate in position on the pedestal only if the substrate significantly lifts off the pedestal during processing.
- a rinsing fluid is delivered onto the substrate front side through the first fluid inlet 340 .
- the second fluid such as an acid, is delivered to the backside surface through the second fluid inlet to remove any unwanted deposits.
- the dissolving fluid chemically reacts with the deposited material, dissolves, and then flushes the material away from the substrate backside (and flushes the material away from other areas that any unwanted deposits are located).
- the rinsing fluid is adjusted to flow at a greater rate than the dissolving fluid to help protect the front side of the substrate from the dissolving fluid.
- the first and second fluid inlets are located for optimal performance depending on the size of the substrate, the respective flow rates, spray patterns, and amount and type of deposits to be removed, among other factors.
- the rinsing fluid could be routed to the second fluid inlet after a dissolving fluid has dissolved the unwanted deposits to rinse the backside of the substrate.
- an auxiliary fluid inlet connected to flow rinsing fluid on the backside of the substrate could be used to rinse any dissolving fluid residue from the backside.
- the fluid(s) is generally delivered in a spray pattern, which may be varied depending on the particular nozzle spray pattern desired and may include a fan, jet, conical, and other patterns.
- One spray pattern for the first and second fluids through the respective fluid inlets, when the first fluid is a rinsing fluid, is fan pattern with a pressure of about 10 to about 15 pounds per square inch (psi) and a flow rate of about 1 to about 3 gallons per minute (gpm) (for a 200 mm substrate).
- the ECD system can also be used to remove the unwanted deposits along the edge of the substrate to create an edge exclusion zone.
- the unwanted deposits could be removed from the edge and/or edge exclusion zone of the substrate by adjustment of the orientation and placement of the nozzles, the flow rates of the fluids, the rotational speed of the substrate, and the chemical composition of the fluids.
- substantially preventing dissolution of the deposited material on the front side surface may not necessarily include the edge or edge exclusion zone of the substrate.
- preventing dissolution of the deposited material on the front side surface is intended to include at least preventing the dissolution so that the front side with the deposited material is not impaired beyond a commercial value.
- One method of accomplishing the edge exclusion zone dissolution process is to rotate the disk at a slower speed, such as about 100 to about 1000 rpm, while dispensing the dissolving fluid on the backside of the substrate. Inertia moves the dissolving fluid to the edge of the substrate and forms a layer of fluid around the edge due to surface tension of the fluid, so that the dissolving fluid overlaps from the backside to the front side in the edge area of the substrate.
- the rotational speed of the substrate and the flow rate of the dissolving fluid may be used to determine the extent of the overlap onto the front side. For instance, a decrease in rotational speed or an increase in flow results in a less overlap of fluid to the opposing side, e.g., the front side.
- the flow rate and flow angle of the rinsing fluid delivered to the front side can be adjusted to offset the layer of dissolving fluid onto the edge and/or frontside of the substrate.
- the dissolving fluid may be used initially without the rinsing fluid to obtain the edge and/or edge exclusion zone removal, followed by the rinsing/dissolving process described above.
- the SRD module 236 is connected between the loading station 210 and the mainframe 214 .
- the mainframe transfer station 216 includes a mainframe transfer robot 242 .
- the mainframe transfer robot 242 comprises a plurality of individual robot arms 244 that provides independent access of substrates in the processing stations 218 and the SRD stations 212 .
- the mainframe transfer robot 242 comprises two robot arms 244 , corresponding to the number of process cells 240 per processing station 218 .
- Each robot arm 244 includes a robot blade 246 for holding a substrate during a substrate transfer.
- each robot arm 244 is operable independently of the other arm to facilitate independent transfers of substrates in the system.
- the robot arms 244 operate in a coordinated fashion such that one robot extends as the other robot arm retracts.
- the mainframe transfer station 216 includes a flipper robot 248 that facilitates transfer of a substrate from a face-up position on the robot blade 246 of the mainframe transfer robot 242 to a face down position for a process cell 240 that requires face-down processing of substrates.
- the flipper robot 248 includes a main body 250 that provides both vertical and rotational movements with respect to a vertical axis of the main body 250 and a flipper robot arm 252 that provides rotational movement along a horizontal plane along the flipper robot arm 252 .
- a vacuum suction gripper 254 disposed at the distal end of the flipper robot arm 252 , holds the substrate as the substrate is flipped and transferred by the flipper robot 248 .
- the flipper robot 248 positions a substrate 234 into the process cell 240 for face-down processing. The details of the electroplating process cell will be discussed below.
- FIG. 24 is a top schematic view of a mainframe transfer robot having a flipper robot incorporated therein.
- the mainframe transfer robot 242 as shown in FIG. 24 serves to transfer substrates between different stations attached the mainframe station, including the processing stations and the SRD stations.
- the mainframe transfer robot 242 includes a plurality of robot arms 2402 (two shown), and a flipper type end effector 2404 is attached as an end effector for each of the robot arms 2402 .
- Flipper robots are generally known in the art and can be attached as end effectors for substrate handling robots, such as model RR701, available from Rorze Automation, Inc., located in Milpitas, Calif.
- the main transfer robot 242 has a flipper robot as the end effector is capable of transferring substrates between different stations attached to the mainframe as well as flipping the substrate being transferred to the desired surface orientation, i.e., substrate processing surface being face-down for the electroplating process.
- the mainframe transfer robot 242 provides independent robot motion along the X-Y-Z axes by the robot arm 2402 and independent substrate flipping rotation by the flipper robot end effector 2404 .
- the flipper robot 2404 as the end effector of the mainframe transfer robot, the substrate transfer process is simplified because the step of passing a substrate from a mainframe transfer robot to a flipper robot is eliminated.
- FIG. 6 is a cross sectional view of one embodiment of an electroplating process cell 400 .
- the electroplating process cell 400 as shown in FIG. 6 is the same as the electroplating process cell 240 as shown in FIGS. 2 and 3.
- the process cell 400 generally comprises a head assembly 410 , a process kit 420 and an electrolyte solution collector 440 .
- the electrolyte solution collector 440 is secured onto the body 442 of the mainframe 214 over an opening 443 that defines the location for placement of the process kit 420 .
- the electrolyte solution collector 440 includes an inner wall 446 , an outer wall 448 and a bottom 447 connecting the walls.
- An electrolyte solution outlet 449 is disposed through the bottom 447 of the electrolyte solution collector 440 and connected to the electrolyte solution replenishing system 220 (shown in FIG. 2) through tubes, hoses, pipes or other fluid transfer connectors.
- the head assembly 410 is mounted onto a head assembly frame 452 .
- the head assembly frame 452 includes a mounting post 454 and a cantilever arm 456 .
- the mounting post 454 is mounted onto the body 442 of the mainframe 214 , and the cantilever arm 456 extends laterally from an upper portion of the mounting post 454 .
- the mounting post 454 provides rotational movement with respect to a vertical axis along the mounting post to allow rotation of the head assembly 410 .
- the head assembly 410 is attached to a mounting plate 460 disposed at the distal end of the cantilever arm 456 .
- the lower end of the cantilever arm 456 is connected to a cantilever arm actuator 457 , such as a pneumatic cylinder, mounted on the mounting post 454 .
- the cantilever arm actuator 457 provides pivotal movement of the cantilever arm 456 with respect to the joint between the cantilever arm 456 and the mounting post 454 .
- the cantilever arm actuator 457 moves the head assembly 410 away from the process kit 420 to provide the spacing required to remove and/or replace the process kit 420 from the electroplating process cell 400 .
- the cantilever arm actuator 457 When the cantilever arm actuator 457 is extended, the cantilever arm 456 moves the head assembly 410 toward the process kit 420 to position the substrate in the head assembly 410 in a processing position.
- the head assembly 410 generally comprises a substrate holder assembly 450 and a substrate assembly actuator 458 .
- the substrate assembly actuator 458 is mounted onto the mounting plate 460 , and includes a head assembly shaft 462 extending downwardly through the mounting plate 460 .
- the lower end of the head assembly shaft 462 is connected to the substrate holder assembly 450 to position the substrate holder assembly 450 in a processing position and in a substrate loading position.
- the substrate holder assembly 450 generally comprises a substrate holder 464 and a cathode contact ring 466 .
- FIG. 7 is a cross sectional view of one embodiment of a cathode contact ring 466 .
- the contact ring 466 comprises an annular body having a plurality of conducting members disposed thereon.
- the annular body is constructed of an insulating material to electrically isolate the plurality of conducting members. Together the body and conducting members form a diametrically interior substrate seating surface which, during processing, supports a substrate and provides a current thereto.
- the contact ring 466 generally comprises a plurality of conducting members 765 at least partially disposed within an annular insulative body 770 .
- the insulative body 770 is shown having a flange 762 and a downward sloping shoulder portion 764 leading to a substrate seating surface 768 located below the flange 762 .
- the flange 762 and the substrate seating surface 768 lie in offset and substantially parallel planes.
- the flange 762 may be understood to define a first plane while the substrate seating surface 768 defines a second plane parallel to the first plane wherein the shoulder 764 is disposed between the two planes.
- contact ring design shown in FIG. 7 is intended to be merely illustrative.
- the shoulder portion 764 may be of a steeper angle including a substantially vertical angle so as to be substantially normal to both the flange 762 and the substrate seating surface 768 .
- the contact ring 466 may be substantially planar thereby eliminating the shoulder portion 764 .
- one embodiment comprises the shoulder portion 764 shown in FIG. 6 or some variation thereof.
- the conducting members 765 are defined by a plurality of outer electrical contact pads 780 annularly disposed on the flange 762 , a plurality of inner electrical contact pads 772 disposed on a portion of the substrate seating surface 768 , and a plurality of embedded conducting connectors 776 which link the pads 772 , 780 to one another.
- the conducting members 765 are isolated from one another by the insulative body 770 .
- the insulative body may be made of a plastic such as polyvinylidenefluoride (PVDF), perfluoroalkoxy resin (PFA), TEFLON® (a registered trademark of the E.
- the outer contact pads 780 are coupled to a power supply (not shown) to deliver current and voltage to the inner contact pads 772 via the connectors 776 during processing.
- the inner contact pads 772 supply the current and voltage to a substrate by maintaining contact around a peripheral portion of the substrate.
- the conducting members 765 act as discrete current paths electrically connected to a substrate.
- the conducting members 765 are preferably made of copper (Cu), platinum (Pt), tantalum (Ta), titanium (Ti), gold (Au), silver (Ag), stainless steel or other conducting materials. Low resistivity and low contact resistance may also be achieved by coating the conducting members 765 with a conducting material.
- the conducting members 765 may, for example, be made of copper (resistivity for copper is approximately 2 ⁇ 10 ⁇ 8 ⁇ m) and be coated with platinum (resistivity for platinum is approximately 10.6 ⁇ 10 ⁇ 8 ⁇ m).
- Coatings such as tantalum nitride (TaN), titanium nitride (TiN), rhodium (Rh), Au, Cu, or Ag on a conductive base materials such as stainless steel, molybdenum (Mo), Cu, and Ti are also possible.
- the contact pads 772 , 780 are typically separate units bonded to the conducting connectors 776 , the contact pads 772 , 780 may comprise one material, such as Cu, and the conducting members 765 another, such as stainless steel. Either or both of the pads 772 , 180 and conducting connectors 776 may be coated with a conducting material.
- the inner contact pads 772 preferably comprise a material resistant to oxidation such as Pt, Ag, or Au.
- the total resistance of each circuit is dependent on the geometry, or shape, of the inner contact inner contact pads 772 and the force supplied by the contact ring 466 . These factors define a constriction resistance, R CR , at the interface of the inner contact pads 772 and the substrate seating surface 768 due to asperities between the two surfaces.
- R CR constriction resistance
- the apparent area is also increased.
- the apparent area is, in turn, inversely related to R CR so that an increase in the apparent area results in a decreased R CR .
- the maximum force applied in operation is limited by the yield strength of a substrate which may be damaged under excessive force and resulting pressure.
- the contact pads 772 may have a flat upper surface as in FIG. 7, other shapes may be used to advantage.
- FIGS. 8 and 9 two preferred shapes are shown in FIGS. 8 and 9.
- FIG. 8 shows a knife-edge contact pad
- FIG. 9 shows a hemispherical contact pad.
- a person skilled in the art will readily recognize other shapes which may be used to advantage.
- a more complete discussion of the relation between contact geometry, force, and resistance is given in Ney Contact Manual, by Kenneth E. Pitney, The J. M. Ney Company, 1973, which is hereby incorporated by reference in its entirety.
- the number of connectors 776 may be varied depending on the particular number of contact pads 772 (shown in FIG. 7) desired. For a 200 mm substrate, preferably at least twenty-four connectors 776 are spaced equally over 360°. However, as the number of connectors reaches a critical level, the compliance of the substrate relative to the contact ring 466 is adversely affected. Therefore, while more than twenty-four connectors 776 may be used, contact uniformity may eventually diminish depending on the topography of the contact pads 772 and the substrate stiffness. Similarly, while less than twentyfour connectors 776 may be used, current flow is increasingly restricted and localized, leading to poor plating results. Since the dimensions of the components of the process cell are readily altered to suit a particular application (for example, a 300 mm substrate), the optimal number may easily be determined for varying scales and embodiments.
- the substrate seating surface 768 comprises an isolation gasket 782 .
- the isolation gasket is disposed on the insulative body 770 and extends diametrically interior to the inner contact pads 772 to define the inner diameter of the contact ring 466 .
- the isolation gasket 782 preferably extends slightly above the inner contact pads 772 (e.g., a few mils) and preferably comprises an elastomer such as VITON® (a registered trademark of the E. I duPont de Nemoirs and Company of Wilmingtopn, Del.), TEFLON®, buna rubber and the like. Where the insulative body 770 also comprises an elastomer the isolation gasket 782 may be of the same material.
- the isolation gasket 782 and the insulative body 770 may be monolithic, i.e., formed as a single piece. However, the isolation gasket 782 is preferably separate from the insulative body 770 so that it may be easily removed for replacement or cleaning.
- FIG. 10 shows one embodiment of the isolation gasket 782 wherein the isolation gasket is seated entirely on the insulative body 770
- FIGS. 8 and 9 show an alternative embodiment.
- the insulative body 770 is partially machined away to expose the upper surface of the connecting member 776 and the isolation gasket 782 is disposed thereon.
- the isolation gasket 782 contacts a portion of the connecting member 776 .
- This design requires less material to be used for the inner contact pads 772 that may be advantageous where material costs are significant such as when the inner contact pads 772 comprise gold. Persons skilled in the art will recognize other embodiments that do not depart from the scope of the present invention.
- the isolation gasket 782 maintains contact with a peripheral portion of the substrate plating surface and is compressed to provide a seal between the remaining cathode contact ring 466 and the substrate.
- the seal prevents the electrolyte solution from contacting the edge and backside of the substrate.
- maintaining a clean contact surface is necessary to achieving high plating repeatability.
- Previous contact ring designs did not provide consistent plating results because contact surface topography varied over time.
- the contact ring eliminates, or substantially minimizes, deposits which would otherwise accumulate on the inner contact pads 772 and change their characteristics thereby producing highly repeatable, consistent, and uniform plating across the substrate plating surface.
- FIG. 11 is a simplified schematic diagram representing a possible configuration of the electrical circuit for the contact ring 466 .
- an external resistor 700 is connected in series with each of the conducting members 765 .
- the resistance value of the external resistor 700 (represented as R EXT ) is much greater than the resistance of any other component of the circuit.
- the electrical circuit through each conducting member 765 is represented by the resistance of each of the components connected in series with the power supply 702 .
- R E represents the resistance of the electrolyte solution, which is typically dependent on the distance between the anode and the cathode contact ring and the chemical composition of the electrolyte solution.
- R A represents the resistance of the electrolyte solution adjacent the substrate plating surface 754 .
- R S represents the resistance of the substrate plating surface 754
- R C represents the resistance of the cathode conducting members 765 plus the constriction resistance resulting at the interface between the inner contact pads 772 and the substrate plating layer 754 .
- the resistance value of the external resistor (R EXT ) is at least as much as ⁇ R (where ⁇ R equals the sum of R E , R A , R S and R C ).
- the resistance value of the external resistor (R EXT ) is much greater than ⁇ R such that ⁇ R is negligible and the resistance of each series circuit approximates R EXT .
- one power supply is connected to all of the outer contact pads 780 of the cathode contact ring 466 , resulting in parallel circuits through the inner contact pads 772 .
- the inner contact pad-to-substrate interface resistance varies with each inner contact pad 772 , more current will flow, and thus more plating will occur, at the site of lowest resistance.
- an external resistor in series with each conducting member 765 , the value or quantity of electrical current passed through each conducting member 765 becomes controlled mainly by the value of the external resistor.
- the uniform current density applied across the plating surface contributes to a uniform plating thickness of the metal film deposited on the seed layer on the substrate.
- the external resistors also provide a uniform current distribution between different substrates of a process-sequence.
- the contact ring 466 is designed to resist deposit buildup on the inner contact pads 772 , over multiple substrate plating cycles the substrate-pad interface resistance may increase, eventually reaching an unacceptable value.
- An electronic sensor/alarm 704 can be connected across the external resistor 700 to monitor the voltage/current across the external resistor to address this problem. If the voltage/current across the external resistor 700 falls outside of a preset operating range that is indicative of a high substrate-pad resistance, the sensor/alarm 704 triggers corrective measures such as shutting down the plating process until the problems are corrected by an operator.
- a separate power supply can be connected to each conducting member 765 and can be separately controlled and monitored to provide a uniform current distribution across the substrate.
- VSS very smart system
- the VSS typically comprises a processing unit and any combination of devices known in the industry used to supply and/or control current such as variable resistors, separate power supplies, etc.
- the VSS processes and analyzes data feedback. The data is compared to pre-established setpoints and the VSS then makes appropriate current and voltage alterations to ensure uniform deposition.
- FIG. 18 is a perspective view of an alternative embodiment of a cathode contact ring.
- the cathode contact ring 1800 as shown in FIG. 18 comprises a conductive metal or a metal alloy, such as stainless steel, copper, silver, gold, platinum, titanium, tantalum, and other conductive materials, or a combination of conductive materials, such as stainless steel coated with platinum.
- the cathode contact ring 1800 includes an upper mounting portion 1810 adapted for mounting the cathode contact ring onto the substrate holder assembly and a lower substrate receiving portion 1820 adapted for receiving a substrate therein.
- the substrate receiving portion 1820 includes an annular substrate seating surface 1822 having a plurality of contact pads or bumps 1824 disposed thereon and preferably evenly spaced apart.
- the contact pads 1824 physically contact a peripheral region of the substrate to provide electrical contact to the electroplating seed layer on the substrate deposition surface.
- the contact pads 1824 are coated with a noble metal; such as platinum or gold, that is resistant to oxidation.
- the exposed surfaces of the cathode contact ring are preferably treated to provide hydrophilic surfaces or coated with a material that exhibits hydrophilic properties.
- Hydrophilic materials and hydrophilic surface treatments are known in the art.
- One company providing a hydrophilic surface treatment is Millipore Corporation, located in Bedford, Mass.
- the hydrophilic surface significantly reduces beading of the electrolyte solution on the surfaces of the cathode contact ring and promotes smooth dripping of the electrolyte solution from the cathode contact ring after the cathode contact ring is removed from the electroplating bath or electrolyte solution.
- hydrophilic surfaces on the cathode contact ring that facilitate run-off of the electrolyte solution, plating defects caused by residual electrolyte solution on the cathode contact ring are significantly reduced.
- the inventors also contemplate application of this hydrophilic treatment or coating in other embodiments of cathode contact rings to reduce residual electrolyte solution beading on the cathode contact ring and the plating defects on a subsequently processed substrate that may result therefrom.
- the substrate holder 464 is preferably positioned above the cathode contact ring 466 and comprises a bladder assembly 470 that provides pressure to the backside of a substrate and ensures electrical contact between the substrate plating surface and the cathode contact ring 466 .
- the inflatable bladder assembly 470 is disposed on a substrate holder plate 832 .
- a bladder 836 disposed on a lower surface of the substrate holder plate 832 is thus located opposite and adjacent to the contacts on the cathode contact ring 466 with the substrate 821 interposed therebetween.
- a fluid source 838 supplies a fluid, i.e., a gas or liquid, to the bladder 836 allowing the bladder 836 to be inflated to varying degrees.
- the substrate holder plate 832 is shown as substantially disc-shaped having an annular recess 840 formed on a lower surface and a centrally disposed vacuum port 841 .
- One or more inlets 842 are formed in the substrate holder plate 832 and lead into the relatively enlarged annular mounting channel 843 and the annular recess 840 .
- Quick-disconnect hoses 844 couple the fluid source 838 to the inlets 842 to provide a fluid thereto.
- the vacuum port 841 is preferably attached to a vacuum/pressure pumping system 859 adapted to selectively supply a pressure or create a vacuum at a backside of the substrate 821 .
- the pumping system 859 shown in FIG. 12, comprises a pump 845 , a cross-over valve 847 , and a vacuum ejector 849 (commonly known as a venturi).
- a vacuum ejector that may be used to advantage is available from SMC Pneumatics, Inc., of Indianapolis, Ind.
- the pump 845 may be a commercially available compressed gas source and is coupled to one end of a hose 851 , the other end of the hose 851 being coupled to the vacuum port 841 .
- the hose 851 is split into a pressure line 853 and a vacuum line 855 having the vacuum ejector 849 disposed therein.
- Fluid flow is controlled by the cross-over valve 847 which selectively switches communication with the pump 845 between the pressure line 853 and the vacuum line 855 .
- the cross-over valve has an OFF setting whereby fluid is restricted from flowing in either direction through hose 851 .
- a shut-off valve 861 disposed in hose 851 prevents fluid from flowing from pressure line 855 upstream through the vacuum ejector 849 .
- the desired direction of fluid flow is indicated by arrows.
- the fluid source 838 is a gas supply it may be coupled to hose 851 thereby eliminating the need for a separate compressed gas supply, i.e., pump 845 .
- a separate gas supply and vacuum pump may supply the backside pressure and vacuum conditions.
- a simplified embodiment may comprise a pump capable of supplying only a backside vacuum.
- deposition uniformity may be improved where a backside pressure is provided during processing. Therefore, an arrangement such as the one described above including a vacuum ejector and a cross-over valve is preferred.
- a substantially circular ring-shaped manifold 846 is disposed in the annular recess 840 .
- the manifold 846 comprises a mounting rail 852 disposed between an inner shoulder 848 and an outer shoulder 850 .
- the mounting rail 852 is adapted to be at least partially inserted into the annular mounting channel 843 .
- a plurality of fluid outlets 854 formed in the manifold 846 provide communication between the inlets 842 and the bladder 836 .
- Seals 837 such as O-rings, are disposed in the annular manifold channel 843 in alignment with the inlet 842 and outlet 854 and secured by the substrate holder plate 832 to ensure an airtight seal.
- Conventional fasteners such as screws may be used to secure the manifold 846 to the substrate holder plate 832 via cooperating threaded bores (not shown) formed in the manifold 846 and the substrate holder plate 832 .
- the bladder 836 is shown, in section, as an elongated substantially semi-tubular piece of material having annular lip seals 856 , or nodules, at each edge.
- the lip seals 856 are shown disposed on the inner shoulder 848 and the outer shoulder 850 .
- a portion of the bladder 836 is compressed against the walls of the annular recess 840 by the manifold 846 which has a width slightly less (e.g. a few millimeters) than the annular recess 840 .
- the manifold 846 , the bladder 836 , and the annular recess 840 cooperate to form a fluid-tight seal.
- the bladder 836 is preferably comprised of some fluid impervious material such as silicon rubber or any comparable elastomer which is chemically inert with respect to the electrolyte solution and exhibits reliable elasticity.
- a compliant covering 857 may be disposed over the bladder 836 , as shown in FIG. 15, and secured by means of an adhesive or thermal bonding.
- the covering 857 preferably comprises an elastomer such as VitonTM, buna rubber or the like, which may be reinforced by KevlarTM, for example.
- the covering 857 and the bladder 836 comprise the same material.
- the covering 857 has particular application where the bladder 836 is liable to rupturing.
- the bladder 836 thickness may simply be increased during its manufacturing to reduce the likelihood of puncture.
- the exposed surface of the bladder 836 (if uncovered) and the exposed surface of the covering 857 are coated or treated to provide a hydrophilic surface (as discussed above for the surfaces of the cathode contact ring). This coating promotes dripping and removal of the residual electrolyte solution after the head assembly is lifted above the process cell.
- inlets 842 and outlets 854 may be varied according to the particular application.
- FIG. 12 shows two inlets with corresponding outlets
- an alternative embodiment could employ a single fluid inlet which supplies fluid to the bladder 836 .
- the substrate 821 is introduced into the container body 802 by securing it to the lower side of the substrate holder plate 832 . This is accomplished by engaging the pumping system 159 to evacuate the space between the substrate 821 and the substrate holder plate 832 via port 841 thereby creating a vacuum condition.
- the bladder 836 is then inflated by supplying a fluid such as air or water from the fluid source 838 to the inlets 842 .
- the fluid is delivered into the bladder 836 via the manifold outlets 854 , thereby pressing the substrate 821 uniformly against the contacts of the cathode contact ring 466 .
- the electroplating process is then carried out.
- Electrolyte solution is then pumped into the process kit 420 toward the substrate 821 to contact the exposed substrate plating surface 820 .
- the power supply provides a negative bias to the substrate plating surface 820 via the cathode contact ring 466 .
- ions in the electrolytic solution are attracted to the surface 820 and deposit on the surface 820 to form the desired film.
- the bladder 836 deforms to accommodate the asperities of the substrate backside and contacts of the cathode contact ring 466 thereby mitigating misalignment with the conducting cathode contact ring 466 .
- the compliant bladder 836 prevents the electrolyte solution from contaminating the backside of the substrate 821 by establishing a fluid tight seal at a perimeter portion of a backside of the substrate 821 .
- a uniform pressure is delivered downward toward the cathode contact ring 466 to achieve substantially equal force at all points where the substrate 821 and cathode contact ring 466 interface.
- the force can be varied as a function of the pressure supplied by the fluid source 838 .
- the effectiveness of the bladder assembly 470 is not dependent on the configuration of the cathode contact ring 466 .
- FIG. 12 shows a pin configuration having a plurality of discrete contact points
- the cathode contact ring 466 may also be a continuous surface.
- the force delivered to the substrate 821 by the bladder 836 is variable, adjustments can be made to the current flow supplied by the contact ring 466 .
- an oxide layer may form on the cathode contact ring 466 and act to restrict current flow.
- increasing the pressure of the bladder 836 may counteract the current flow restriction due to oxidation.
- the malleable oxide layer is compromised and superior contact between the cathode contact ring 466 and the substrate 821 results.
- the effectiveness of the bladder 836 in this capacity may be further improved by altering the geometry of the cathode contact ring 466 . For example, a knife-edge geometry is likely to penetrate the oxide layer more easily than a dull rounded edge or flat edge.
- the fluid tight seal provided by the inflated bladder 836 allows the pump 845 to maintain a backside vacuum or pressure either selectively or continuously, before, during, and after processing.
- the pump 845 is run to maintain a vacuum only during the transfer of substrates to and from the electroplating process cell 400 because it has been found that the bladder 836 is capable of maintaining the backside vacuum condition during processing without continuous pumping.
- the backside vacuum condition is simultaneously relieved by disengaging the pumping system 859 , e.g., by selecting an OFF position on the cross-over valve 847 .
- Disengaging the pumping system 859 may be abrupt or comprise a gradual process whereby the vacuum condition is ramped down. Ramping allows for a controlled exchange between the inflating bladder 836 and the simultaneously decreasing backside vacuum condition. This exchange may be controlled manually or by computer.
- pumping system 859 is capable of selectively providing a vacuum or pressure condition to the substrate backside. For a 200 mm substrate a backside pressure up to 5 psi is preferable to bow the substrate. Because substrates typically exhibit some measure of pliability, a backside pressure causes the substrate to bow or assume a convex shape relative to the upward flow of the electrolyte solution. The degree of bowing is variable according to the pressure supplied by pumping system 859 .
- FIG. 12A shows one embodiment of a bladder 836 having a surface area sufficient to cover a relatively small perimeter portion of the substrate backside at a diameter substantially equal to the cathode contact ring 466 .
- the geometric configuration of the bladder assembly 470 can be varied.
- the bladder assembly may be constructed using more fluid impervious material to cover an increased surface area of the substrate 821 .
- FIG. 19 is a partial cross sectional view of an alternative embodiment of a substrate holder assembly.
- the alternative substrate holder assembly 1900 comprises a bladder assembly 470 , as described above, having the inflatable bladder 836 attached to the back surface of an intermediary substrate holder plate 1910 .
- a portion of the inflatable bladder 836 is sealingly attached to the back surface 1912 of the intermediary substrate holder plate 1910 using an adhesive or other bonding material.
- the front surface 1914 of the intermediary substrate holder plate 1910 is adapted to receive a substrate 821 to be processed.
- An elastomeric o-ring 1916 is disposed in an annular groove 1918 on the front surface 1914 of the intermediary substrate holder plate 1910 to contact a peripheral portion of the substrate back surface.
- the elastomeric o-ring 1916 provides a seal between the substrate back surface and the front surface of the intermediary substrate holder plate.
- the intermediary substrate holder plate includes a plurality of bores or holes 1920 extending through the plate that are in fluid communication with the vacuum port 841 .
- the plurality of holds 1920 facilitate securing the substrate on the substrate holder using a vacuum force applied to the backside of the substrate.
- the inflatable bladder does not directly contact a substrate being processed, and thus the risk of cutting or damaging the inflatable bladder during substrate transfers is significantly reduced.
- the elastomeric O-ring 1916 is preferably coated or treated to provide a hydrophilic surface (as discussed above for the surfaces of the cathode contact ring) for contacting the substrate.
- the elastomeric O-ring 1916 is replaced as needed to ensure proper contact and seal to the substrate.
- FIG. 25 is an alternative embodiment of the process head assembly having a rotatable head assembly 2410 .
- a rotational actuator is disposed on the cantilevered arm and attached to the head assembly to rotate the head assembly during substrate processing.
- the rotatable head assembly 2410 is mounted onto a head assembly frame 2452 .
- the alternative head assembly frame 2452 and the rotatable head assembly 2410 are mounted onto the mainframe similarly to the head assembly frame 452 and head assembly 410 as shown in FIG. 6 and described above.
- the head assembly frame 2452 includes a mounting post 2454 , a post cover 2455 , and a cantilever arm 2456 .
- the mounting post 2454 is mounted onto the body of the mainframe 214 , and the post cover 2455 covers a top portion of the mounting post 2454 .
- the mounting post 454 provides rotational movement (as indicated by arrow A 1 ) with respect to a vertical axis along the mounting post to allow rotation of the head assembly frame 2452 .
- the cantilever arm 2456 extends laterally from an upper portion of the mounting post 2454 and is pivotally connected to the post cover 2455 at the pivot joint 2459 .
- the rotatable head assembly 2410 is attached to a mounting slide 2460 disposed at the distal end of the cantilever arm 2456 .
- the mounting slide 2460 guides the vertical motion of the head assembly 2410 .
- a head lift actuator 2458 is disposed on top of the mounting slide 2460 to provide vertical displacement of the head assembly 2410 .
- the lower end of the cantilever arm 2456 is connected to the shaft 2453 of a cantilever arm actuator 2457 , such as a pneumatic cylinder or a lead-screw actuator, mounted on the mounting post 2454 .
- the cantilever arm actuator 2457 provides pivotal movement (as indicated by arrow A 2 ) of the cantilever arm 2456 with respect to the joint 2459 between the cantilever arm 2456 and the post cover 2454 .
- the cantilever arm actuator 2457 moves the head assembly 2410 away from the process kit 420 .
- the movement of the head assembly 2410 provide the spacing required to remove and/or replace the process kit 420 from the electroplating process cell 240 .
- the cantilever arm actuator 2457 When the cantilever arm actuator 2457 is extended, the cantilever arm 2456 moves the head assembly 2410 toward the process kit 420 to position the substrate in the head assembly 2410 in a processing position.
- the rotatable head assembly 2410 includes a rotating actuator 2464 slideably connected to the mounting slide 2460 .
- the shaft 2468 of the head lift actuator 2458 is inserted through a lift guide 2466 attached to the body of the rotating actuator 2464 .
- the shaft 2468 is a lead-screw type shaft that moves the lift guide (as indicated by arrows A 3 ) between various vertical positions.
- the rotating actuator 2464 is connected to the substrate holder assembly 2450 through the shaft 2470 and rotates the substrate holder assembly 2450 (as indicated by arrows A 4 ).
- the substrate holder assembly 2450 includes a bladder assembly, such as the embodiments described above with respect to FIGS. 12 - 15 and 19 , and a cathode contact ring, such as the embodiments described above with respect to FIGS. 7 - 10 and 18 .
- the rotation of the substrate during the electroplating process generally enhances the deposition results.
- the head assembly is rotated between about 2 rpm and about 20 rpm during the electroplating process.
- the head assembly can also be rotated.
- the head assembly can be lowered to position the seed layer on the substrate in contact with the electrolyte solution in the process cell.
- the head assembly is raised to remove the seed layer on the substrate from the electrolyte solution in the process cell.
- the head assembly is preferably rotated at a high speed (i.e., >20 rpm) after the head assembly is lifted from the process cell to enhance removal of residual electrolyte solution on the head assembly.
- the uniformity of the deposited film has been improved within about 2% (i.e., maximum deviation of deposited film thickness is at about 2% of the average film thickness) while standard electroplating processes typically achieves uniformity at best within about 5.5%.
- rotation of the head assembly is not necessary to achieve uniform electroplating deposition in some instances, particularly where the uniformity of electroplating deposition is achieved by adjusting the processing parameters, such as the chemicals in the electrolyte solution, electrolyte solution flow and other parameters.
- the process kit 420 generally comprises a bowl 430 , a container body 472 , an anode assembly 474 and a filter 476 .
- the anode assembly 474 is disposed below the container body 472 and attached to a lower portion of the container body 472
- the filter 476 is disposed between the anode assembly 474 and the container body 472 .
- the container body 472 is preferably a cylindrical body comprised of an electrically insulative material, such as ceramics, plastics, PLEXIGLAS® (acrylic), lexane, PVC, CPVC, and PVDF.
- the container body 472 can be made from a coated metal, such as stainless steel, nickel and titanium.
- the coated metal is coated with an insulating layer (such as TEFLON®, PVDF, plastic, rubber and other combinations of materials) that do not dissolve in the electrolyte solution.
- the insulating layer can be electrically insulated from the electrodes (i.e., the anode and cathode of the electroplating system).
- the container body 472 is preferably sized and adapted to conform to the substrate plating surface and the shape of the of a substrate being processed through the system, typically circular or rectangular in shape.
- One preferred embodiment of the container body 472 comprises a cylindrical ceramic tube having an inner diameter that has about the same dimension as or slightly larger than the substrate diameter. The inventors have discovered that the rotational movement typically required in typical electroplating systems is not required to achieve uniform plating results when the size of the container body conforms to about the size of the substrate plating surface.
- An upper portion of the container body 472 extends radially outwardly to form an annular weir 478 .
- the weir 478 extends over the inner wall 446 of the electrolyte solution collector 440 and allows the electrolyte solution to flow into the electrolyte solution collector 440 .
- the upper surface of the weir 478 preferably matches the lower surface of the cathode contact ring 466 .
- the upper surface of the weir 478 includes an inner annular flat portion 480 , a middle inclined portion 482 and an outer declined portion 484 .
- a gap for electrolyte solution flow is formed between the lower surface of the cathode contact ring 466 and the upper surface of the weir 478 .
- the lower surface of the cathode contact ring 466 is disposed above the inner flat portion 480 and the middle inclined portion of the weir 478 .
- the outer declined portion 484 is sloped downwardly to facilitate flow of the electrolyte solution into the electrolyte solution collector 440 .
- a lower portion of the container body 472 extends radially outwardly to form a lower annular flange 486 for securing the container body 472 to the bowl 430 .
- the outer dimension (i.e., circumference) of the annular flange 486 is smaller than the dimensions of the opening 444 and the inner circumference of the electrolyte solution collector 440 .
- the smaller dimension of the annular flange to allow removal and replacement of the process kit 420 from the electroplating process cell 400 .
- multiple bolts 488 are fixedly disposed on the annular flange 486 and extend downwardly through matching bolt holes on the bowl 430 .
- a plurality of removable fastener nuts 490 secure the process kit 420 onto the bowl 430 .
- a seal 487 such as an elastomer O-ring, is disposed between container body 472 and the bowl 430 radially inwardly from the bolts 488 to prevent leaks from the process kit 420 .
- the nuts/bolts combination facilitates fast and easy removal and replacement of the components of the process kit 420 during maintenance.
- the filter 476 is attached to and completely covers the lower opening of the container body 472 , and the anode assembly 474 is disposed below the filter 476 .
- a spacer 492 is disposed between the filter 476 and the anode assembly 474 .
- the filter 476 , the spacer 492 , and the anode assembly 474 are fastened to a lower surface of the container body 472 using removable fasteners, such as screws and/or bolts.
- the filter 476 , the spacer 492 , and the anode assembly 474 are removably secured to the bowl 430 .
- the anode assembly 474 preferably comprises a consumable anode that serves as a metal source in the electrolyte solution.
- the anode assembly 474 comprises a non-consumable anode, and the metal to be electroplated is supplied within the electrolyte solution from the electrolyte solution replenishing system 220 .
- the anode assembly 474 is a self-enclosed module having a porous anode enclosure 494 preferably made of the same metal as the metal to be electroplated, such as copper.
- the anode enclosure 494 is made of porous materials, such as ceramics or polymeric membranes.
- a soluble metal 496 such as high purity copper for electrochemical deposition of copper, is disposed within the anode enclosure 494 .
- the soluble metal 496 preferably comprises metal particles, wires or a perforated sheet.
- the porous anode enclosure 494 also acts as a filter that keeps the particulates generated by the dissolving metal within the anode enclosure 494 .
- the consumable (i.e., soluble) anode provides gas-generation-free electrolyte solution and minimizes the need to constantly replenish the metal in the electrolyte solution.
- An anode electrode contact 498 is inserted through the anode enclosure 494 to provide electrical connection to the soluble metal 496 from a power supply.
- the anode electrode contact 498 is made from a conductive material that is insoluble in the electrolyte solution, such as titanium, platinum and platinum-coated stainless steel.
- the anode electrode contact 498 extends through the bowl 430 and is connected to an electrical power supply.
- the anode electrical contact 498 includes a threaded portion 497 (for a fastener nut 499 to secure the anode electrical contact 498 to the bowl 430 ), and a seal 495 (such as a elastomer washer, is disposed between the fastener nut 499 and the bowl 430 to prevent leaks from the process kit 420 ).
- a seal 495 such as a elastomer washer
- the bowl 430 generally comprises a cylindrical portion 502 and a bottom portion 504 .
- An upper annular flange 506 extends radially outwardly from the top of the cylindrical portion 502 .
- the upper annular flange 506 includes a plurality of holes 508 that matches the number of bolts 488 from the lower annular flange 486 of the container body 472 .
- Bolts 488 are inserted through the holes 508 , and the fastener nuts 490 are fastened onto the bolts 488 that secure the upper annular flange 506 of the bowl 430 to the lower annular flange 486 of the container body 472 .
- the outer dimension (i.e., circumference) of the upper annular flange 506 is about the same as the outer dimension (i.e., circumference) of the lower annular flange 486 .
- the lower surface of the upper annular flange 506 of the bowl 430 rests on a support flange of the mainframe 214 when the process kit 420 is positioned on the mainframe 214 .
- the inner circumference of the cylindrical portion 502 accommodates the anode assembly 474 and the filter 476 .
- the outer dimensions of the filter 476 and the anode assembly 474 are slightly smaller than the inner dimension of the cylindrical portion 502 . These relative dimensions force a substantial portion of the electrolyte solution to flow through the anode assembly 474 first before flowing through the filter 476 .
- the bottom portion 504 of the bowl 430 includes an electrolyte solution inlet 510 that connects to an electrolyte solution supply line from the electrolyte solution replenishing system 220 .
- the anode assembly 474 is disposed about a middle portion of the cylindrical portion 502 of the bowl 430 .
- the anode assembly 474 is configured to provide a gap for electrolyte solution flow between the anode assembly 474 and the electrolyte solution inlet 510 on the bottom portion 504 .
- the electrolyte solution inlet 510 and the electrolyte solution supply line are preferably connected by a releasable connector that facilitates easy removal and replacement of the process kit 420 .
- the electrolyte solution is drained from the process kit 420 , and the electrolyte solution flow in the electrolyte solution supply line is discontinued and drained.
- the connector for the electrolyte solution supply line is released from the electrolyte solution inlet 510 , and the electrical connection to the anode assembly 474 is also disconnected.
- the head assembly 410 is raised or rotated to provide clearance for removal of the process kit 420 .
- the process kit 420 is then removed from the mainframe 214 , and a new or reconditioned process kit is replaced into the mainframe 214 .
- the bowl 430 can be secured onto the support flange of the mainframe 214 , and the container body 472 along with the anode and the filter are removed for maintenance.
- the nuts securing the anode assembly 474 and the container body 472 to the bowl 430 are removed to facilitate removal of the anode assembly 474 and the container body 472 .
- New or reconditioned anode assembly 474 and container body 472 are then replaced into the mainframe 214 and secured to the bowl 430 .
- FIG. 20 is a cross sectional view of a first embodiment of an encapsulated anode.
- the encapsulated anode 2000 includes a permeable anode enclosure that filters or traps “anode sludge” or particulates generated as the metal is dissolved from the anode plate 2004 .
- the anode plate 2004 comprises a solid piece of copper.
- the anode plate 2004 is a high purity, oxygen free copper, enclosed in a hydrophilic anode encapsulation membrane 2002 .
- the anode plate 2004 is secured and supported by a plurality of electrical contacts or feed-throughs 2006 that extend through the bottom of the bowl 430 .
- the electrical contacts or feed-throughs 2006 extend through the anode encapsulation membrane 2002 into the bottom surface of the anode plate 2004 .
- the flow of the electrolyte solution is indicated by the arrows A from the electrolyte solution inlet 510 disposed at the bottom of the bowl 430 through the gap between the anode and the bowl sidewall.
- the electrolyte solution also flows through the anode encapsulation membrane 2002 by permeation into and out of the gap between the anode encapsulation membrane and the anode plate, as indicated by the arrows B.
- the anode encapsulation membrane 2002 comprises a hydrophilic porous membrane, such as a modified polyvinyllidene fluoride membrane, having porosity between about 60% and 80%, more preferably about 70%, and pore sizes between about 0.025 ⁇ m and about 1 ⁇ m, more preferably between about 0.1 ⁇ m and about 0.2 ⁇ m.
- a hydrophilic porous membrane is the Durapore Hydrophilic Membrane, available from Millipore Corporation, located in Bedford, Mass.
- FIG. 21 is a cross sectional view of a second embodiment of an encapsulated anode. Similar to the first embodiment of an encapsulated anode, the anode plate 2004 is secured and supported on the electrical feed-throughs 2006 . A top encapsulation membrane 2008 and a bottom encapsulation membrane 2010 , disposed respectively above and below the anode plate 2004 , are attached to a membrane support ring 2012 that is disposed around the anode plate 2004 . The top and bottom encapsulation membranes 2008 , 2010 comprise a material from the list above for encapsulation membrane of the first embodiment of the encapsulated anode.
- the membrane support ring 2012 preferably comprises a relatively rigid material (as compared to the encapsulation membrane), such as plastic or other polymers.
- a bypass fluid inlet 2014 is disposed through the bottom of the bowl 430 and through the bottom encapsulation membrane 2010 to introduce electrolyte solution into the gap between the encapsulation membranes and the anode plate.
- a bypass outlet 2016 is connected to the membrane support ring 2012 and extends through the bowl 430 to facilitate flow of excess electrolyte solution with the anode sludge or generated particulates out of the encapsulated anode into a waste drain (not shown).
- the flow of the electrolyte solution within the bypass fluid inlet 2014 and the main electrolyte solution inlet 510 are individually controlled by flow control valves 2020 , 2022 .
- the individual flow control valves 2020 , 2022 are respectively placed along the fluid lines connected to the inlets.
- the fluid pressure in the bypass fluid inlet 2014 is preferably maintained at a higher pressure than the pressure in the main electrolyte solution inlet 510 .
- the flow of the electrolyte solution inside the bowl 430 from the main electrolyte solution inlet 510 is indicated by arrows A, and the flow of the electrolyte solution inside the encapsulated anode 2000 is indicated by the arrows B.
- the bypass outlet 2016 By providing a dedicated bypass electrolyte solution supply into the encapsulated anode, the anode sludge or particulates generated from the dissolving anode is continually removed from the anode, thereby improving the purity of the electrolyte solution during the electroplating process.
- FIG. 22 is a cross sectional view of a third embodiment of an encapsulated anode.
- the third embodiment of an encapsulated anode 2000 includes an anode plate 2004 secured and supported on a plurality of electrical feed-throughs 2006 , a top and a bottom encapsulation membrane 2008 , 2010 attached to a membrane support ring 2012 , and a bypass outlet 2016 connected to the membrane support ring 2012 and extending through the bowl 430 .
- This third embodiment of an encapsulated anode preferably comprises materials as described above for the first and second embodiments of an encapsulated anode.
- the bottom encapsulation membrane 2010 according to the third embodiment includes one or more openings 2024 disposed substantially above the main electrolyte solution inlet 510 .
- the opening 2024 is adapted to receive flow of electrolyte solution from the main electrolyte solution inlet 510 and is preferably about the same size as the internal circumference of the main electrolyte solution inlet 510 .
- the flow of the electrolyte solution from the main electrolyte solution inlet 510 is indicated by the arrows A and the flow of the electrolyte solution within the encapsulated anode is indicated by the arrows B.
- a portion of the electrolyte solution flows out of the encapsulated anode through the bypass outlet 2016 , carrying a portion of the anode sludge and particulates generated from anode dissolution.
- FIG. 23 is a cross sectional view of a fourth embodiment of an encapsulated anode.
- the fourth embodiment of an encapsulated anode 2000 includes an anode plate 2002 secured and supported on a plurality of electrical feed-throughs 2006 , a top and a bottom encapsulation membrane 2008 , 2010 attached to a membrane support ring 2012 , and a bypass fluid inlet 2014 disposed through the bottom of the bowl 430 and through the bottom encapsulation membrane 2010 to introduce electrolyte solution into the gap between the encapsulation membranes and the anode plate.
- This fourth embodiment of an encapsulated anode preferably comprises materials as described above for the first and second embodiments of an encapsulated anode.
- the flow of the electrolyte solution through the bypass fluid inlet 2014 and the main electrolyte solution inlet 510 are individually controlled by control valves 2020 , 2022 , respectively.
- the flow of the electrolyte solution from the main electrolyte solution inlet 510 is indicated by the arrows A while the flow of the electrolyte solution through the encapsulated anode is indicated by arrows B.
- the anode sludge and particulates generated by the dissolving anode plate are filtered and trapped by the encapsulation membranes as the electrolyte solution passes through the membrane.
- FIG. 16 is a schematic diagram of an electrolyte solution replenishing system 220 .
- the electrolyte solution replenishing system 220 provides the electrolyte solution to the electroplating process cells for the electroplating process.
- the electrolyte solution replenishing system 220 generally comprises a main electrolyte solution tank 602 , a dosing module 603 , a filtration module 605 , a chemical analyzer module 616 , and an electrolyte solution waste disposal system 622 connected to the analyzing module 616 by an electrolyte solution waste drain 620 .
- One or more controllers control the composition of the electrolyte solution in the main tank 602 and the operation of the electrolyte solution replenishing system 220 .
- the controllers are independently operable but integrated with the controller 222 of the electroplating system platform 200 .
- the main electrolyte solution tank 602 provides a reservoir for electrolyte solution and includes an electrolyte solution supply line 612 that is connected to each of the electroplating process cells through one or more fluid pumps 608 and valves 607 .
- a heat exchanger 624 or a heater/chiller disposed in thermal connection with the main tank 602 controls the temperature of the electrolyte solution stored in the main tank 602 .
- the heat exchanger 624 is connected to and operated by the controller 610 .
- the dosing module 603 is connected to the main tank 602 by a supply line and includes a plurality of source tanks 606 , or feed bottles, a plurality of valves 609 , and a controller 611 .
- the source tanks 606 contain the chemicals needed for composing the electrolyte solution and typically include a deionized water source tank and copper sulfate (CuSO 4 ) source tank for composing the electrolyte solution.
- Other source tanks 606 may contain hydrogen sulfate (H 2 SO 4 ), hydrogen chloride (HCl) and various additives such as glycol.
- Each source tank is preferably color coded and fitted with a unique mating outlet connector adapted to connect to a matching inlet connector in the dosing module. By color coding the source tanks and fitting the source tanks with unique connectors, errors caused by human operators when exchanging or replacing the source tanks are significantly reduced.
- the deionized water source tank preferably also provides deionized water to the system for cleaning the system during maintenance.
- the valves 609 associated with each source tank 606 regulate the flow of chemicals to the main tank 602 and may be any of numerous commercially available valves such as butterfly valves, throttle valves and the like. Activation of the valves 609 is accomplished by the controller 611 which is preferably connected to the system control 222 to receive signals therefrom.
- the electrolyte solution filtration module 605 includes a plurality of filter tanks 604 .
- An electrolyte solution return line 614 is connected between each of the process cells and one or more filter tanks 604 .
- the filter tanks 604 remove the undesired contents in the used electrolyte solution before returning the electrolyte solution to the main tank 602 for re-use.
- the main tank 602 is also connected to the filter tanks 604 to facilitate re-circulation and filtration of the electrolyte solution in the main tank 602 .
- By re-circulating the electrolyte solution from the main tank 602 through the filter tanks 604 the undesired contents in the electrolyte solution are continuously removed by the filter tanks 604 to maintain a consistent level of purity. Additionally, re-circulating the electrolyte solution between the main tank 602 and the filtration module 605 allows the various chemicals in the electrolyte solution to be thoroughly mixed.
- the electrolyte solution replenishing system 220 also includes a chemical analyzer module 616 that provides real-time chemical analysis of the chemical composition of the electrolyte solution.
- the analyzer module 616 is fluidly coupled to the main tank 602 by a sample line 613 and to the waste disposal system 622 by an outlet line 621 .
- the analyzer module 616 generally comprises at least one analyzer and a controller to operate the analyzer. The number of analyzers required for a particular processing tool depends on the composition of the electrolyte solution. For example, while a first analyzer may be used to monitor the concentrations of organic substances, a second analyzer is needed for inorganic chemicals. In the specific embodiment shown in FIG.
- the chemical analyzer module 616 comprises an auto titration analyzer 615 and a cyclic voltametric stripper (CVS) 617 . Both analyzers are commercially available from various suppliers. An auto titration analyzer which may be used to advantage is available from Parker Systems and a cyclic voltametric stripper is available from ECI. The auto titration analyzer 615 determines the concentrations of inorganic substances such as copper chloride and acid. The CVS 617 determines the concentrations of organic substances such as the various additives which may be used in the electrolyte solution and by-products resulting from the processing which are returned to the main tank 602 from the process cells.
- CVS cyclic voltametric stripper
- each analyzer may be coupled to the main electrolyte solution tank by a separate supply line and be operated by separate controllers. Persons skilled in the art will recognize other embodiments.
- a sample of electrolyte solution is flowed to the analyzer module 616 via the sample line 613 .
- the sample may be taken periodically, preferably a continuous flow of electrolyte solution is maintained to the analyzer module 616 .
- a portion of the sample is delivered to the auto titration analyzer 615 and a portion is delivered to the CVS 617 for the appropriate analysis.
- the controller 619 initiates command signals to operate the analyzers 615 , 617 in order to generate data.
- the information from the chemical analyzers 615 , 617 is then communicated to the controller 222 .
- the controller 222 processes the information and transmits signals that include user-defined chemical dosage parameters to the dosing controller 611 .
- the received information is used to provide real-time adjustments to the source chemical replenishment rates by operating one or more of the valves 609 .
- the received information thereby maintains a desired, and preferably constant, chemical composition of the electrolyte solution throughout the electroplating process.
- the waste electrolyte solution from the analyzer module is then flowed to the waste disposal system 622 via the outlet line 621 .
- the dosing module 603 may be controlled manually by an operator observing the output values provided by the chemical analyzer module 616 .
- the system software allows for both an automatic real-time adjustment mode as well as an operator (manual) mode.
- multiple controllers are shown in FIG. 16, a single controller may be used to operate various components of the system such as the chemical analyzer module 616 , the dosing module 603 , and the heat exchanger 624 .
- Other embodiments will be apparent to those skilled in the art.
- the electrolyte solution replenishing system 220 also includes an electrolyte solution waste drain 620 connected to an electrolyte solution waste disposal system 622 for safe disposal of used electrolyte solutions, chemicals and other fluids used in the electroplating system.
- the electroplating cells include a direct line connection to the electrolyte solution waste drain 620 (or the electrolyte solution waste disposal system 622 ).
- the electrolyte solution waste drain 620 drains the electroplating cells without returning the electrolyte solution through the electrolyte solution replenishing system 220 .
- the electrolyte solution replenishing system 220 preferably also includes a bleed off connection to bleed off excess electrolyte solution to the electrolyte solution waste drain 620 .
- the electrolyte solution replenishing system 220 also includes one or more degasser modules 630 adapted to remove undesirable gases from the electrolyte solution.
- the degasser module generally comprises a membrane that separates gases from the fluid passing through the degasser module and a vacuum system for removing the released gases.
- the degasser modules 630 are preferably placed in line on the electrolyte solution supply line 612 adjacent to the process cells 240 .
- the degasser modules 630 are preferably positioned as close as possible to the process cells 240 so most of the gases from the electrolyte solution replenishing system are removed by the degasser modules before the electrolyte solution enters the process cells.
- each degasser module 630 includes two outlets to supply degassed electrolyte solution to the two process cells 240 of each processing station 218 .
- a degasser module 630 is provided for each process cell.
- the degasser modules can be placed at many other alternative positions.
- the degasser module can be placed at other positions - in the electrolyte solution replenishing system, such as along with the filter section or in a closed-loop system with the main tank or with the process cell.
- one degasser module is placed in line with the electrolyte solution supply line 612 to provide degassed electrolyte solution to all of the process cells 240 of the electrochemical deposition system.
- a separate degasser module is positioned in-line or in a closed-loop with the deionized water supply line and is dedicated for removing oxygen from the deionized water source. Because deionized water is used to rinse the processed substrates, free oxygen gases are preferable removed from the deionized water before reaching the SRD modules so that the electroplated copper is less likely to become oxidized by the rinsing process.
- Degasser modules are well known in the art and commercial embodiments are generally available and adaptable for use in a variety of applications. A commercially available degasser module is available from Millipore Corporation, located in Bedford, Mass.
- One embodiment of the degasser module 630 includes a hydrophobic membrane 632 having a fluid (i.e., electrolyte solution) passage 634 on one side of the membrane 632 .
- a vacuum system 636 disposed on the opposite side of the membrane.
- the enclosure 638 of the degasser module includes an inlet 640 and one or more outlets 642 .
- the gases and other micro-bubbles in the electrolyte solution are separated from the electrolyte solution through the hydrophobic membrane and removed by the vacuum system.
- Another embodiment of the degasser module 630 ′ as shown in FIG.
- 26 b includes a tube of hydrophobic membrane 632 ′ and a vacuum system 636 disposed around the tube of hydrophobic membrane 632 ′.
- the electrolyte solution is introduced inside the tube of hydrophobic membrane, and as the electrolyte solution passes through the fluid passage 634 in the tube.
- the hydrophobic membrane separates gases and other micro-bubbles in the electrolyte solution, and a tube that is connected to the vacuum system 636 removes the separated gasses.
- More complex designs of degasser modules are contemplated, including designs having serpentine paths of the electrolyte solution across the membrane and other multi-sectioned designs of degasser modules.
- the electrolyte solution replenishing system 220 may include a number of other components.
- the electrolyte solution replenishing system 220 preferably also includes one or more additional tanks for storage of chemicals for a substrate cleaning system, such as the SRD station. Double-contained piping for hazardous material connections may also be employed to provide safe transport of the chemicals throughout the system.
- the electrolyte solution replenishing system 220 includes connections to additional or external electrolyte solution processing system to provide additional electrolyte solution supplies to the electroplating system.
- FIG. 17 is a cross sectional view of one embodiment of rapid thermal anneal (RTA) chamber.
- the RTA chamber 211 is preferably connected to the loading station 210 , and substrates are transferred into and out of the RTA chamber 211 by the loading station transfer robot 228 .
- the electroplating system as shown in FIGS. 2 and 3, preferably comprises two RTA chambers 211 disposed on opposing sides of the loading station 210 , corresponding to the symmetric design of the loading station 210 .
- RTA chambers are generally well known in the art, and RTA chambers are typically utilized in substrate processing systems to enhance the properties of the deposited materials. A variety of RTA chamber designs may be utilized, including hot plate designs and heat lamp designs, to enhance the electroplating results.
- One particular applicable RTA chamber is the W ⁇ Z chamber available from Applied materials, Inc., located in Santa Clara, Calif.
- the RTA chamber 211 generally comprises an enclosure 902 , a heater plate 904 , a heater 907 and a plurality of substrate support pins 906 .
- the enclosure 902 includes a base 908 , a sidewall 910 and a top 912 .
- a cold plate 913 is disposed below the top 912 of the enclosure.
- the cold plate is integrally formed as part of the top 912 of the enclosure.
- a reflector insulator dish 914 is disposed inside the enclosure 902 on the base 908 .
- the reflector insulator dish 914 is typically made from a material such as quartz, alumina, or other material that can withstand high temperatures (i.e., greater than about 500° C.).
- the reflector insulator dish acts as a thermal insulator between the heater 907 and the enclosure 902 .
- the dish 914 may also be coated with a reflective material, such as gold, to direct heat back to the heater plate 906 .
- the heater plate 904 preferably has a large mass compared to the substrate being processed in the system.
- the heater plate is preferably fabricated from a material such as silicon carbide, quartz, or other materials that do not react with any ambient gases in the RTA chamber 211 or with the substrate material.
- the heater 907 typically comprises a resistive heating element or a conductive/radiant heat source and is disposed between the heated plate 906 and the reflector insulator dish 914 .
- the heater 907 is connected to a power source 916 which supplies the energy needed to heat the heater 907 .
- a thermocouple 920 is disposed in a conduit 922 , disposed through the base 908 and dish 914 , and extends into the heater plate 904 .
- the thermocouple 920 is connected to a controller (i.e., the system controller described below) and supplies temperature measurements to the controller. The controller then increases or decreases the heat supplied by the heater 907 according to the temperature measurements and the desired anneal temperature.
- the enclosure 902 preferably includes a cooling member 918 disposed outside of the enclosure 902 in thermal contact with the sidewall 910 to cool the enclosure 902 .
- a cooling member 918 disposed outside of the enclosure 902 in thermal contact with the sidewall 910 to cool the enclosure 902 .
- one or more cooling channels are formed within the sidewall 910 to control the temperature of the enclosure 902 .
- the cold plate 913 disposed on the inside surface of the top 912 cools a substrate that is positioned in close proximity to the cold plate 913 .
- the RTA chamber 211 includes a slit valve 922 disposed on the sidewall 910 of the enclosure 902 for facilitating transfers of substrates into and out of the RTA chamber.
- the slit valve 922 selectively seals an opening 924 on the sidewall 910 of the enclosure that communicates with the loading station 210 .
- the loading station transfer robot 228 (see FIG. 2) transfers substrates into and out of the RTA chamber through the opening 924 .
- the substrate support pins 906 preferably comprise distally tapered members constructed from quartz, aluminum oxide, silicon carbide, or other high temperature resistant materials. Each substrate support pin 906 is disposed within a tubular conduit 926 , preferably made of a heat and oxidation resistant material, that extends through the heater plate 904 .
- the substrate support pins 906 are connected to a lift plate 928 for moving the substrate support pins 906 in a uniform manner.
- the lift plate 928 is attached to an actuator 930 (such as a stepper motor) through a lift shaft 932 .
- the actuator 930 moves the lift plate 928 to facilitate positioning of a substrate at various vertical positions within the RTA chamber.
- the lift shaft 932 extends through the base 908 of the enclosure 902 and is sealed by a sealing flange 934 disposed around the shaft.
- the slit valve 922 is opened, and the loading station transfer robot 228 extends its robot blade having a substrate positioned thereon through the opening 924 into the RTA chamber.
- the robot blade of the loading station transfer robot 228 positions the substrate in the RTA chamber above the heater plate 904 , and the substrate support pins 906 are extended upwards to lift the substrate above the robot blade.
- the robot blade then retracts out of the RTA chamber, and the slit valve 922 closes the opening.
- the substrate support pins 906 are then retracted to lower the substrate to a desired distance from the heater plate 904 .
- the substrate support pins 906 may retract fully to place the substrate in direct contact with the heater plate.
- a gas inlet 936 is disposed through the sidewall 910 of the enclosure 902 to allow selected gas flow into the RTA chamber 211 during the anneal treatment process.
- the gas inlet 936 is connected to a gas source 938 through a valve 940 for controlling the flow of the gas into the RTA chamber 211 .
- a gas outlet 942 is preferably disposed at a lower portion of the sidewall 910 of the enclosure 902 to exhaust the gases in the RTA chamber.
- the gas outlet is preferably connected to a relief/check valve 944 to prevent backstreaming of atmosphere from outside of the chamber.
- the gas outlet 942 is connected to a vacuum pump (not shown) to exhaust the RTA chamber to a desired vacuum level during an anneal treatment.
- a substrate is annealed in the RTA chamber 211 after the substrate has been electroplated in the electroplating cell and cleaned in the SRD station.
- the RTA chamber 211 is maintained at about atmospheric pressure, and the oxygen content inside the RTA chamber 211 is controlled to less than about 100 ppm during the anneal treatment process.
- the ambient environment inside the RTA chamber 211 comprises nitrogen (N 2 ) or a combination of nitrogen (N 2 ) and less than about 4% hydrogen (H 2 ).
- the ambient gas flow into the RTA chamber 211 is maintained at greater than 20 liters/min to control the oxygen content to less than 100 ppm.
- the electroplated substrate is preferably annealed at a temperature between about 200° C. and about 450° C.
- RTA processing typically requires a temperature increase of at least 50° C. per second.
- the heater plate is preferably maintained at between about 350° C. and 450° C.
- the substrate is preferably positioned at between about 0 mm and about 20 mm from the heater plate (i.e., contacting the heater plate) for the duration of the anneal treatment process.
- a controller 222 controls the operation of the RTA chamber 211 , including maintaining the desired ambient environment in the RTA chamber and the temperature of the heater plate.
- the substrate support pins 906 lift the substrate to a position for transfer out of the RTA chamber 211 .
- the slit valve 922 opens, and the robot blade of the loading station transfer robot 228 is extended into the RTA chamber and positioned below the substrate.
- the substrate support pins 906 retract to lower the substrate onto the robot blade, and the robot blade then retracts out of the RTA chamber.
- the loading station transfer robot 228 then transfers the processed substrate into the cassette 232 for removal out of the electroplating processing system. (see FIGS. 2 and 3).
- the electroplating system platform 200 includes a controller 222 that controls the functions of each component of the platform.
- the controller 222 is mounted above the mainframe 214 , and the controller comprises a programmable microprocessor.
- the programmable microprocessor is typically programmed using a software designed specifically for controlling all components of the electroplating system platform 200 .
- the controller 222 also provides electrical power to the components of the system and includes a control panel 223 that allows an operator to monitor and operate the electroplating system platform 200 .
- the control panel 223 as shown in FIG. 2, is a stand-alone module that is connected to the controller 222 through a cable and provides easy access to an operator.
- the controller 222 coordinates the operations of the loading station 210 , the RTA chamber 211 , the SRD station 212 , the mainframe 214 and the processing stations 218 . Additionally, the controller 222 coordinates with the controller of the electrolyte solution replenishing system 220 to provide the electrolyte solution for the electroplating process.
- a substrate cassette containing a plurality of substrates is loaded into the substrate cassette receiving areas 224 in the loading station 210 of the electroplating system platform 200 .
- a loading station transfer robot 228 picks up a substrate from a substrate slot in the substrate cassette and places the substrate in the substrate orientor 230 .
- the substrate orientor 230 determines and orients the substrate to a desired orientation for processing through the system.
- the loading station transfer robot 228 then transfers the oriented substrate from the substrate orientor 230 and positions the substrate in one of the substrate slots in the substrate pass-through cassette 238 in the SRD station 212 .
- the mainframe transfer robot 242 picks up the substrate from the substrate pass-through cassette 238 and positions the substrate for transfer by the flipper robot 248 .
- the flipper robot 248 rotates its robot blade below the substrate and picks up substrate from mainframe transfer robot blade.
- the vacuum suction gripper on the flipper robot blade secures the substrate on the flipper robot blade, and the flipper robot flips the substrate from a face up position to a face down position.
- the flipper robot 248 rotates and positions the substrate face down in the substrate holder assembly 450 .
- the substrate is positioned below the substrate holder 464 but above the cathode contact ring 466 .
- the flipper robot 248 then releases the substrate to position the substrate into the cathode contact ring 466 .
- the substrate holder 464 moves toward the substrate and the vacuum chuck secures the substrate on the substrate holder 464 .
- the bladder assembly 470 on the substrate holder assembly 450 exerts pressure against the substrate backside to ensure electrical contact between the substrate plating surface and the cathode contact ring 466 .
- the head assembly 452 is lowered to a processing position above the process kit 420 . At this position the substrate is below the upper plane of the weir 478 and contacts the electrolyte solution contained in the process kit 420 .
- the power supply is activated to supply electrical power (i.e., voltage and current) to the cathode and the anode to enable the electroplating process.
- the electrolyte solution is typically continually pumped into the process kit during the electroplating process.
- the electrical power supplied to the cathode and the anode and the flow of the electrolyte solution are controlled by the controller 222 to achieve the desired electroplating results.
- the head assembly is rotated as the head assembly is lowered and also during the electroplating process.
- the head assembly 410 raises the substrate holder assembly and removes the substrate from the electrolyte solution.
- the head assembly is rotated for a period of time to enhance removal of residual electrolyte solution from the substrate holder assembly.
- the vacuum chuck and the bladder assembly of the substrate holder then release the substrate from the substrate holder.
- the substrate holder is raised to allow the flipper robot blade to pick up the processed substrate from the cathode contact ring.
- the flipper robot rotates the flipper robot blade above the backside of the processed substrate in the cathode contact ring and picks up the substrate using the vacuum suction gripper on the flipper robot blade.
- the flipper robot rotates the flipper robot blade with the substrate out of the substrate holder assembly, flips the substrate from a face-down position to a face-up position, and positions the substrate on the mainframe transfer robot blade.
- the mainframe transfer robot then transfers and positions the processed substrate above the SRD module 236 .
- the SRD substrate support lifts the substrate, and the mainframe transfer robot blade retracts away from the SRD module 236 .
- the substrate is cleaned in the SRD module using deionized water or a combination of deionized water and a cleaning fluid as described in detail above.
- the substrate is then positioned for transfer out of the SRD module.
- the loading station transfer robot 228 picks up the substrate from the SRD module 236 and transfers the processed substrate into the RTA chamber 211 for an anneal treatment process to enhance the properties of the deposited materials.
- the annealed substrate is then transferred out of the RTA chamber 211 by the loading station robot 228 and placed back into the substrate cassette for removal from the electroplating system.
- the above-described sequence can be carried out for a plurality of substrates substantially simultaneously in the electroplating system platform 200 .
- the electroplating system can be adapted to provide multi-stack substrate processing.
- FIG. 27 One embodiment of a modular metal deposition cell 2700 is shown in FIG. 27.
- the modular metal deposition cell 2700 represents one embodiment of the process cell 240 shown in FIG. 3.
- the modular metal deposition cell 2700 comprises a cell base 2702 , a cell top 2704 , an anode 2706 , a diffuser 2720 , and an de-connectable fastener portion 2712 .
- the cell base may include the encapsulated anode 2000 shown in the embodiments of FIGS. 20 - 23 .
- the modular metal deposition cell 2700 is configured to be mounted to a modular cell frame 2800 formed in a support member 2802 .
- One embodiment of the modular cell frame 2800 is shown in FIG. 28.
- the modular cell frame 2800 includes a recess perimeter 2804 and one or more support flanges 2806 attached to the support member 2802 at the recess perimeter 2804 .
- One or more bolt recesses 2808 are formed in the support flanges 2806 .
- the de-connectable fastener portion 2712 comprises an upper flange 2714 and a lower flange 2716 .
- the cell top 2704 includes the upper flange 2714 .
- the cell base 2702 includes the lower flange 2716 .
- the upper flange 2714 is positioned above, and in contact with, the support flange 2806 .
- the lower flange 2716 is positioned below, and in contact with, the support flanges 2806 .
- One or more fasteners 2718 connect the upper flange 2714 to the lower flange 2716 through the bolt recesses 2808 formed in the support flanges 2806
- One sealing member such as an elastomeric gasket extends around the periphery of the modular metal deposition cell 2700 between the support flanges 2806 and each one of the flanges 2714 and 2716 to limit electrolyte solution escaping from within the cell.
- the fasteners 2718 (bolts) that connect the upper flange 2714 to the lower flange 2716 extend through the bolt recesses 2808 formed in the support flanges 2806 .
- the fasteners 2718 not only connect the cell top 2704 (including the upper flange 2714 ) to the cell base 2702 (including the lower flange 2716 ), but the fasteners 2718 secure both the cell top 2704 and the cell base 2702 to the support flanges 2806 of the modular cell frame 2800 .
- the de-connectable fastener portion 2712 sealably connects the cell top 2704 to the cell base 2702 to define the interior recess 2708 within the modular metal deposition cell 2700 .
- electrolyte solution is contained within the interior recess 2708 in a manner so a substrate contained in the head assembly 2410 or 410 described above can be inserted into, or removed from, electrolyte solution contained in the modular metal deposition cell 2700 through an opening 2710 formed in the modular metal deposition cell 2700 .
- the head assembly 2410 shown in FIG. 25, can be mounted to the modular cell frame 2800 in a position that provides for insertion into, and retraction from, the opening 2710 formed in the modular metal deposition cell 2700 .
- the anode 2706 is supported within the cell base 2702 by electrical contacts and feed throughs 2006 that extend through a bottom portion 2722 of the cell base 2702 .
- the electric contacts and feed throughs 2006 provide electrical voltage/current to the anode 2706 under the control of the controller 222 .
- the electrical contacts and feed throughs 2006 support the anode in a raised position above the bottom portion 2722 so a first fluid void 2724 is formed between the anode 2706 and the bottom portion.
- the anode 2706 does not extend to the vertical periphery of the interior recess 2708 so a second fluid void 2726 is created between the side of the anode 2706 and the cell base 2702 .
- a third fluid void 2728 is formed between the upper surface of the anode 2706 and the lower surface of the diffuser 2720 .
- the first fluid void 2724 , the second fluid void 2726 , and the third fluid void 2728 form a fluid continuum that are each in fluid communication with each other.
- the electrolyte solution inlet 510 is in fluid communication with the first fluid void 2724 , so any electrolyte solution applied through the electrolyte solution inlet 510 can pass through the fluid voids 2724 , 2726 , and 2728 to be in fluid communication with the upper surface of the anode 2706 and the lower surface of the diffuser 2720 .
- the diffuser 2720 extends within a recess mount 2732 formed in the cell base 2702 .
- the diffuser 2720 is secured between the cell top 2704 and the cell base 2702 .
- the diffuser 2710 is formed from a plastic, rubber, metal, or other material that can maintain its general shape within the modular metal deposition cell 2700 under the electrolyte solution fluid pressures applied through the electrolyte solution inlet 510 .
- the diffuser contains generally vertically-oriented pores 2721 that enhance fluid flow of electrolyte solution in the vertical direction above the diffuser, and limit fluid flow of electrolyte solution in the horizontal direction above the diffuser 2720 .
- the electrolyte solution is applied through the electrolyte solution inlet at a pressure above atmospheric pressure.
- the pressure of the electrolyte solution within the third fluid void 2728 that is in fluid communication with the diffuser is also above atmospheric pressure. Therefore, electrolyte solution will be directed through the pores in the diffuser 2720 from below the diffuser to above the diffuser in a direction that is substantially parallel to the orientation of the pores formed in the diffuser.
- the diffuser 2720 therefore enhances the uniformity of the electrolyte solution fluid flow in the vertical direction across the width of the modular metal deposition cell.
- the modular metal deposition cell 2700 applies a metal film to the seed layer on a substrate.
- the head assembly 2410 shown in the embodiment of FIG. 25 moves the substrate through the opening 2710 to a position within the interior recess 2708 . Subsequently, the head assembly 2410 removes the substrate from within the modular metal deposition cell 2728 for further transport and processing.
- the electrolyte solution is initially drained from within the interior recess 2708 .
- the draining of the electrolyte solution is typically performed through a drain in a fluid connector coupled to the electrolyte solution inlet 510 (or through the electrolyte solution inlet itself). Any electric connection to the electrical contacts or feed throughs 2006 is disconnected.
- the de-connectable fastener portion is then disconnected by removing the fasteners 2718 . After the fasteners 2718 are removed, the cell base 2702 is lowered from below, and the cell top 2704 is raised above, the modular recess frame 2800 .
- the fastener can be removed and only that portion needs to be replaced. For example, if only the anode 2706 in the cell base 2702 needs to be replaced, then the fasteners 2718 are removed, the cell base to be replaced 2702 is removed, the replacement cell base 2702 is inserted into the position, and the fasteners 2718 are re-inserted. During this procedure, the cell top 2704 remains in the position. After the modular metal deposition cell 2700 is reinstalled, and operating, any repair work on the replaced cell base 2702 or cell top 2704 can be performed.
- a new modular metal deposition cell replacement part is installed. Any repair that is to be done on the removed modular metal deposition cell 2700 can be performed after the new modular metal deposition cell 2700 is installed.
- This rapid replacement of the modular metal deposition cells limits down-time of the electroplating system platform 200 to the time necessary to replace the cell top or cell bottom in the modular metal deposition cell, and does not include time necessary to repair the specific part of the modular metal deposition cell.
- the diffuser 2720 is initially lifted from the cell base 2702 .
- the electrical contacts and feed throughs 2006 contain a threaded connection joint 2736 that may be unscrewed to provide for separation of the anode 2706 from the cell base 2702 , and the removed anode 2706 is then removed from within the cell base 2702 .
- the replacement anode is then inserted into the cell base 2702 , and the electrical contacts and feed throughs 2006 are connected to the replacement anode 2706 .
- the diffuser 2720 is initially inserted in the cell base 2702 .
- the cell top 2704 is positioned above the modular cell frame 2800 so the fasteners 2718 that extend through the upper flange 2714 align with the bolt recesses 2808 formed in the support flanges 2806 .
- the cell top 2704 is supported by the modular cell frame 2800 .
- the cell base 2702 is then positioned below the modular cell frame 2800 and the fasteners 2718 are aligned with the threaded fastener recesses (or nuts) in the lower flange 2716 .
- the fasteners 2718 are then tightened to form a sealing connection between the cell top 2704 and the cell base 2702 .
- a gasket may be inserted to enhance the seal between the cell top and the cell base.
- the fluid connections are then re-connected or re-sealed to the electrolyte solution inlet 510 .
- the electrical connections are re-established to the electrical contacts and feed throughs 2006 .
- Electrolyte solution is input to fill the interior recess 2708 of the interior of the modular metal deposition cell.
- the modular metal deposition cell 2700 is then ready for operation when the head assembly 2410 lowers the substrate into the electrolyte solution in the modular metal deposition cell 2700 .
- the modular metal deposition cell is configured to provide for rapid replacement of the high wear items such as the anode 2706 to limit down-time in the modular metal deposition cell 2700 .
- the high wear items can be repaired or replaced within the removed cell top or cell base following removal from the modular metal deposition cell, and the cell top or cell base with the replacement part can be re-used.
- Replacement cell tops and/or cell bottoms of modular metal deposition cells 2700 can be kept on supply, and old or worn modular metal deposition cells can be repaired or replaced without excessive down-time of the electroplating system platform 200 . Limiting the down-time of the electroplating system associated with repair or replacement of modular metal deposition cells 2700 increases the usage time of the overall system.
Abstract
The present invention relates to a method and apparatus for depositing metal on a substrate. More particularly, one embodiment of the metal deposition cell comprising a cell base, an anode, and a cell top. The cell base at least partially defines an interior recess. The anode mounted within the interior recess to the cell base. The cell top is removably mounted to the cell base. In one embodiment, a method of removing a modular metal deposition cell from a deposition cell mount is provided. The modular metal deposition cell comprises a cell top and a cell bottom. The method comprises unfastening a fastener that secures the cell top to the cell bottom, and also fastens the cell top and the cell bottom to the deposition cell mount. The cell top or the cell bottom is then removed from the deposition cell mount.
Description
- This application is a continuation of co-pending U.S. patent application Ser. No. 09/663,814 filed Sep. 15, 2000, which claims benefit of U.S. patent application Ser. No. 09/289,074 filed Apr. 8, 1999. Each of the aforementioned related patent applications is herein incorporated by reference.
- 1. Field of the Invention
- The present invention generally relates to deposition of a metal layer onto a substrate. More particularly, the present invention relates to a modular cell to be used within an electrochemical deposition or electroplating system.
- 2. Description of the Related Art
- Electroplating has been previously limited in integrated circuit design to the fabrication of lines on circuit boards. Electroplating is now used to deposit metals (such as copper) such as on a seed layer contained within features (e.g., vias, trenches, or contacts) and over the fields surrounding these features. One feature filling embodiment that utilizes electroplating requires initially depositing a diffusion barrier layer on the substrate. A seed layer is deposited (typically by physical vapor deposition) to form a plating surface on the substrate. Metal is then deposited by electroplating on the seed layer on the substrate. The seed layer is typically formed from the same metal as the subsequently electroplated metal, so the deposited seed layer becomes contiguous with the deposited metal. Finally, the deposited metal can be planarized by another process, e.g., chemical mechanical polishing (CMP), to define the conductive interconnect feature.
- Electroplating is performed by establishing a voltage/current level between the seed layer on the substrate and a separate anode (both the seed layer and the substrate are contained within the conductive electrolyte solution) to deposit metal ions on the layer to form the deposited metal. The resulting positive metal ions (for example Cu+) are attracted to, and deposited on, the negatively charged substrate surface.
- Electroplating is performed in electrolyte cells that normally have an opening, and which are filled with electrolyte solution. Electrolyte cells comprise an anode, a controller, and an associated substrate holder. The substrate holder secures a substrate in a position so the substrate can be inserted through the opening, and the substrate seed layer is immersed in the electrolyte solution. The anode is also positioned in the electrolyte solution within the electrolyte cell. An electric current/voltage is established through the electrolyte solution between the anode and the seed layer on the substrate. The electrolyte solution contains the metal ions that are deposited on the substrate seed layer to form the metal film during the electroplating process.
- The electrolyte cells need to be maintained and/or repaired occasionally. For example, the anode chemically reacts with the electrolyte solution when immersed therein, and the chemical reaction disperses metal ions, such as copper sulfate (that can be electrically dissociated into distinct copper and sulfate ions). The chemical reaction between the anode and the electrolyte solution also degrades the anode and causes the anode to be irregularly-shaped. The shape of the anode also can affect the shape of the electromagnetic field generated between the anode and the seed layer. An irregularly shaped electric field results in uneven deposition of metal across the surface of the seed layer during the electroplating process. When the anodes become overly worn, they must be replaced to maintain uniformity of deposition across the substrate seed layer.
- The electrolyte cell is removed from the electroplating system during maintenance and/or repair. To remove an electrolyte cell from the electroplating system, the electrolyte solution is removed from the electrolyte cell and the electrolyte cell is removed from its mount. Accordingly, the electroplating system is unusable during repair of the cell, thereby resulting in loss of production and increased cost of operation of the electroplating system.
- Therefore, there remains a need for an electroplating or other electrochemical deposition system in which the down-time of the entire electroplating system for maintenance and repair of the electrolyte cell is minimized.
- The present invention generally provides a method and apparatus for depositing metal on a substrate. One embodiment of method for removing a modular metal deposition cell from a deposition cell mount comprises unfastening a fastener that secures a cell top to a cell bottom, and also fastens the cell top and the cell bottom to the deposition cell mount. The cell top or the cell bottom are removed from the deposition cell mount.
- So that the manner in which the above recited features, advantages and objects of the present invention are attained can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
- The terms “below”, “above”, “bottom”, “top”, “up”, “down”, “upper”, and “lower” and other positional terms used herein are shown with respect to the embodiments in the figures and may be varied depending on the relative orientation of the processing apparatus.
- FIG. 1 is a simplified cross sectional view of a typical fountain plater incorporating contacts;
- FIG. 2 is a perspective view of one embodiment of an electroplating system platform;
- FIG. 3 is a schematic view of one embodiment of an electroplating system platform;
- FIG. 4 is a schematic perspective view of one embodiment of a spin-rinse-dry-(SRD) module, incorporating rinsing and dissolving fluid inlets;
- FIG. 5 is a side cross sectional view of the spin-rinse-dry (SRD) module of FIG. 4 and shows a substrate in a processing position vertically disposed between fluid inlets;
- FIG. 6 is a cross sectional view of one embodiment of an electroplating process cell;
- FIG. 7 is a partial cross sectional perspective view of a cathode contact ring;
- FIG. 8 is a cross sectional perspective view of the cathode contact ring showing an alternative embodiment of the contact pads;
- FIG. 9 is a cross sectional perspective view of the cathode contact ring showing an alternative embodiment of the contact pads and an isolation gasket;
- FIG. 10 is a cross sectional perspective view of the cathode contact ring showing the isolation gasket;
- FIG. 11 is a simplified schematic diagram of the electrical circuit representing the electroplating system through each contact;
- FIG. 12 is a cross sectional view of one embodiment of a substrate assembly;
- FIG. 12A is an enlarged cross sectional view of the bladder area of FIG. 12;
- FIG. 13 is a partial cross sectional view of a substrate holder plate;
- FIG. 14 is a partial cross sectional view of a manifold;
- FIG. 15 is a partial cross sectional view of a bladder;
- FIG. 16 is a schematic diagram of an electrolyte solution replenishing system;
- FIG. 17 is a cross sectional view of a rapid thermal anneal chamber;
- FIG. 18 is a perspective view of an alternative embodiment of a cathode contact ring;
- FIG. 19 is a partial cross sectional view of an alternative embodiment of a substrate holder assembly;
- FIG. 20 is a cross sectional view of a first embodiment of an encapsulated anode;
- FIG. 21 is a cross sectional view of a second embodiment of an encapsulated anode;
- FIG. 22 is a cross sectional view of a third embodiment of an encapsulated anode;
- FIG. 23 is a cross sectional view of a fourth embodiment of an encapsulated anode;
- FIG. 24 is a top schematic view of a mainframe transfer robot having a flipper robot incorporated therein;
- FIG. 25 is an alternative embodiment of the process head assembly having a rotatable head assembly;
- FIGS. 26a and 26 b are cross sectional views of embodiments of a degasser module;
- FIG. 27 is a perspective cross sectional view of one embodiment of a removable modular cell having a segment broken away; and
- FIG. 28 is a top view of one embodiment of electroplating system including the removable modular cell of FIG. 27.
- A removable modular cell to be used in an electroplating device is described. One embodiment of electroplating device that contains the removable modular cell is described in detail. The structure and operation of the removable modular cell is also described.
- 1. Electroplating System and Operation
- FIG. 1 shows one embodiment of
fountain plater 10 used in electroplating. Thefountain plater 10 includes anelectrolyte cell 12, asubstrate holder 14, ananode 16, and acontact ring 20. Theelectrolyte cell 12 contains electrolyte solution, and the electrolyte cell has a top opening 21 circumferentially defined by thecontact ring 20. Thesubstrate holder 14 is disposed above the electrolyte cell, and is capable of displacing the substrate to be immersed into, and out of, the electrolyte solution. The substrate holder enters, and is removed from, the electrolyte solution, through the top opening of the electrolyte cell. Thesubstrate holder 14 is also capable of securing and positioning the substrate in a desired position within the electrolyte solution during processing. Thecontact ring 20 comprises a plurality of metal or metal alloy electrical contacts that electrically contact the seed layer on the substrate. Acontroller 23 is electrically connected to the contacts and to the anode, and the controller provides an electrical current to the substrate when the seed layer on the substrate is being plated. The controller thereby determines the electrical current/voltage established across from the anode to the seed layer on the substrate. - FIG. 2 is a perspective view of one embodiment of an
electroplating system platform 200. FIG. 3 is a top schematic view of theelectroplating system platform 200 shown in FIG. 2. Referring to both FIGS. 2 and 3, theelectroplating system platform 200 generally comprises aloading station 210, athermal anneal chamber 211, a spin-rinse-dry (SRD)station 212, amainframe 214, and an electrolytesolution replenishing system 220. Preferably, theelectroplating system platform 200 is enclosed in a clean environment using panels such as PLEXIGLAS® (a registered trademark of the Rohm and Haas Company, West Philadelphia, Pa.). Themainframe 214 generally comprises amainframe transfer station 216 and a plurality ofprocessing stations 218. Eachprocessing station 218 includes one ormore process cells 240. An electrolytesolution replenishing system 220 is positioned adjacent theelectroplating system platform 200 and connected to theprocess cells 240 individually to circulate electrolyte solution used for the electroplating process. Theelectroplating system platform 200 also includes acontroller 222, typically comprising a programmable microprocessor. - The
controller 222, whose components are shown in FIG. 3, comprises a central processing unit (CPU) 260,memory 262,circuit portion 265, input output interface (I/O) 279, and bus (not shown). Thecontroller 222 may be a general-purpose computer, a microprocessor, a microcontroller, or any other known suitable type of computer or controller. TheCPU 260 performs the processing and arithmetic operations for thecontroller 222. Thecontroller 222 controls the processing, robotic operations, timing, etc. associated with theelectroplating system platform 200. The controller controls the voltage applied to theanode 16, the plating surface 15 of thesubstrate 22, and the operation of thesubstrate holder assembly 450 as shown in FIG. 6. - The
memory 262 includes random access memory (RAM) and read only memory (ROM) that together store the computer programs, operands, operators, dimensional values, system processing temperatures and configurations, and other parameters that control the electroplating operation. The bus provides for digital information transmissions betweenCPU 260,circuit portion 265,memory 262, and I/O 279. The bus also connects I/O 279 to the portions of the electrochemical deposition (ECD)system 200 that either receive digital information from, or transmit digital information to,controller 222. - I/O279 provides an interface to control the transmissions of digital information between each of the components in
controller 222. I/O 279 also provides an interface between the components of thecontroller 222 and different portions of theECD system 200.Circuit portion 265 comprises all of the other user interface devices (such as display and keyboard). - In this disclosure, the term “substrate” is intended to describe substrates, wafers, or other objects that can be processed within the
electroplating system platform 200. The substrates are generally cylindrical or rectangular in configuration, and may include such irregularities as notches or flatted surfaces that assist in processing. Theloading station 210 preferably includes one or more substratecassette receiving areas 224, one or more loadingstation transfer robots 228 and at least onesubstrate orientor 230. The number of substrate cassette receiving areas, loadingstation transfer robots 228 and substrate orientor included in theloading station 210 can be configured according to the desired throughput of the system. As shown for one embodiment in FIGS. 2 and 3, theloading station 210 includes two substratecassette receiving areas 224, two loadingstation transfer robots 228 and onesubstrate orientor 230. Asubstrate cassette 232 containingsubstrates 234 is loaded onto the substratecassette receiving area 224 to introducesubstrates 234 into the electroplating system platform. The loadingstation transfer robot 228transfers substrates 234 between thesubstrate cassette 232 and thesubstrate orientor 230. The loadingstation transfer robot 228 comprises a typical transfer robot commonly known in the art. The substrate orientor 230 positions eachsubstrate 234 in a desired orientation to ensure that the substrate is properly processed. The loadingstation transfer robot 228 also transferssubstrates 234 between theloading station 210 and theSRD station 212 and between theloading station 210 and thethermal anneal chamber 211. - FIG. 4 is a schematic perspective view of one embodiment of a spin-rinse-dry (SRD) module, incorporating rinsing and dissolving fluid inlets. FIG. 5 is a side cross sectional view of the spin-rinse-dry (SRD) module of FIG. 4 and shows a substrate in a processing position vertically disposed between fluid inlets. Preferably, the
SRD station 212 includes one ormore SRD modules 236 and one or more substrate pass-throughcassettes 238. Preferably, theSRD station 212 includes twoSRD modules 236 corresponding to the number of loadingstation transfer robots 228, and a substrate pass-throughcassette 238 is positioned above eachSRD module 236. The substrate pass-throughcassette 238 facilitates substrate transfer between theloading station 210 and themainframe 214. The substrate pass-throughcassette 238 provides access to and from both the loadingstation transfer robot 228 and a robot in themainframe transfer station 216. - Referring to FIGS. 4 and 5, the
SRD module 236 comprises a bottom 330 a and asidewall 330 b, and anupper shield 330 c which collectively define aSRD module bowl 330 d, where the shield attaches to the sidewall and assists in retaining the fluids within the SRD module. Alternatively, a removable cover could also be used. Apedestal 336, located in the SRD module, includes apedestal support 332 and apedestal actuator 334. Thepedestal 336 supports the substrate 338 (shown in FIG. 5) on the pedestal upper surface during processing. Thepedestal actuator 334 rotates the pedestal to spin the substrate and raises and lowers the pedestal as described below. The substrate may be held in place on the pedestal by a plurality ofclamps 337. The clamps pivot with centrifugal force and engage the substrate preferably in the edge exclusion zone of the substrate. In one embodiment, the clamps engage the substrate only when the substrate lifts off the pedestal during the processing. Vacuum passages (not shown) may also be used as well as other holding elements. The pedestal has a plurality ofpedestal arms outlet 339 allows fluid to be removed from the SRD module. - A
first conduit 346, through which afirst fluid 347 flows, is connected to avalve 347 a. Theconduit 346 may be hose, pipe, tube, or other fluid containing conduits. Thevalve 347 a controls the flow of thefirst fluid 347 and may be selected from a variety of valves including a needle, globe, butterfly, or other valve types and may include a valve actuator, such as a solenoid, that can be controlled with a controller 362. Theconduit 346 connects to a firstfluid inlet 340 that is located above the substrate and includes a mountingportion 342 to attach to the SRD module and a connectingportion 344 to attach to theconduit 346. The first fluid inlet is shown with a singlefirst nozzle 348 to deliver thefirst fluid 347 under pressure onto the substrate upper surface. However, multiple nozzles could be used and multiple fluid inlets could be positioned about the inner perimeter of the SRD module. Preferably, nozzles placed above the substrate should be outside the diameter of the substrate to lessen the risk of the nozzles dripping on the substrate. The firstfluid inlet 340 could be mounted in a variety of locations, including through a cover positioned above the substrate. Additionally, thenozzle 348 may articulate to a variety of positions using an articulating member 343, such as a ball and socket joint. - Similar to the first conduit and related elements described above, a
second conduit 352 is connected to acontrol valve 349 a and a secondfluid inlet 350 with asecond nozzle 351. The secondfluid inlet 350 is shown below the substrate and angled upward to direct a second fluid under the substrate through thesecond nozzle 351. Similar to the first fluid inlet, the second fluid inlet may include a plurality of nozzles, a plurality of fluid inlets and mounting locations, and a plurality of orientations including using the articulatingmember 353. Each fluid inlet could be extended into the SRD module at a variety of positions. For instance, if the flow is desired to be a certain angle that is directed back toward the SRD module periphery along the edge of the substrate. The nozzles can be extended radially outward and the discharge from the nozzles be directed back toward the SRD module periphery. - The
controller 222 could individually control the two fluids and their respective flow rates, pressure, and timing, and any associated valving, as well as the spin cycle(s). The controller could be remotely located, for instance, in a control panel or control room and the plumbing controlled with remote actuators. An alternative embodiment, shown in dashed lines, provides anauxiliary fluid inlet 346 a connected to thefirst conduit 346 with aconduit 346 b and having acontrol valve 346 c. The alternate embodiment may be used to flow a rinsing fluid on the backside of the substrate after the dissolving fluid is applied. the rinsing fluid may be applied without having to reorient the substrate or switch the flow through the second fluid inlet to a rinsing fluid. - In one embodiment, the substrate is mounted with the deposition surface of the disposed face up in the SRD module bowl. As will be explained below, for such an arrangement, the first fluid inlet would generally flow a rinsing fluid, typically deionized water or alcohol. Consequently, the backside of the substrate would be mounted facing down and a fluid flowing through the second fluid inlet would be a dissolving fluid, such as an acid, including hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, or other dissolving liquids or fluids, depending on the material to be dissolved. Alternatively, the first fluid and the second fluid are both rinsing fluids, such as deionized water or alcohol, when the desired process is to rinse the processed substrate.
- In operation, the pedestal is in a raised position, shown in FIG. 4, and a robot (not shown) places the substrate, front side up, onto the pedestal. The pedestal lowers the substrate to a processing position where the substrate is vertically disposed between the first and the second fluid inlets. Generally, the pedestal actuator rotates the pedestal between about 5 to about 5000 rpm, with a typical range between about 20 to about 2000 rpm for a 200 mm substrate. The rotation causes the
lower end 337 a of the clamps to rotate outward aboutpivot 337 b, toward the periphery of the SRD module sidewall, due to centrifugal force. The clamp rotation forces theupper end 337 c of the clamp inward and downward to center and hold thesubstrate 338 in position on thepedestal 336, preferably along the substrate edge. The clamps may rotate into position without touching the substrate and hold the substrate in position on the pedestal only if the substrate significantly lifts off the pedestal during processing. With the pedestal rotating the substrate, a rinsing fluid is delivered onto the substrate front side through the firstfluid inlet 340. The second fluid, such as an acid, is delivered to the backside surface through the second fluid inlet to remove any unwanted deposits. The dissolving fluid chemically reacts with the deposited material, dissolves, and then flushes the material away from the substrate backside (and flushes the material away from other areas that any unwanted deposits are located). In one embodiment, the rinsing fluid is adjusted to flow at a greater rate than the dissolving fluid to help protect the front side of the substrate from the dissolving fluid. The first and second fluid inlets are located for optimal performance depending on the size of the substrate, the respective flow rates, spray patterns, and amount and type of deposits to be removed, among other factors. In some instances, the rinsing fluid could be routed to the second fluid inlet after a dissolving fluid has dissolved the unwanted deposits to rinse the backside of the substrate. In other instances, an auxiliary fluid inlet connected to flow rinsing fluid on the backside of the substrate could be used to rinse any dissolving fluid residue from the backside. After rinsing the front side and/or backside of the substrate, the fluid(s) flow is stopped and the pedestal continues to rotate, spinning the substrate, and thereby effectively drying the substrate surface. - The fluid(s) is generally delivered in a spray pattern, which may be varied depending on the particular nozzle spray pattern desired and may include a fan, jet, conical, and other patterns. One spray pattern for the first and second fluids through the respective fluid inlets, when the first fluid is a rinsing fluid, is fan pattern with a pressure of about 10 to about 15 pounds per square inch (psi) and a flow rate of about 1 to about 3 gallons per minute (gpm) (for a 200 mm substrate).
- The ECD system can also be used to remove the unwanted deposits along the edge of the substrate to create an edge exclusion zone. The unwanted deposits could be removed from the edge and/or edge exclusion zone of the substrate by adjustment of the orientation and placement of the nozzles, the flow rates of the fluids, the rotational speed of the substrate, and the chemical composition of the fluids. Thus, substantially preventing dissolution of the deposited material on the front side surface may not necessarily include the edge or edge exclusion zone of the substrate. Also, preventing dissolution of the deposited material on the front side surface is intended to include at least preventing the dissolution so that the front side with the deposited material is not impaired beyond a commercial value.
- One method of accomplishing the edge exclusion zone dissolution process is to rotate the disk at a slower speed, such as about 100 to about 1000 rpm, while dispensing the dissolving fluid on the backside of the substrate. Inertia moves the dissolving fluid to the edge of the substrate and forms a layer of fluid around the edge due to surface tension of the fluid, so that the dissolving fluid overlaps from the backside to the front side in the edge area of the substrate. The rotational speed of the substrate and the flow rate of the dissolving fluid may be used to determine the extent of the overlap onto the front side. For instance, a decrease in rotational speed or an increase in flow results in a less overlap of fluid to the opposing side, e.g., the front side. Additionally, the flow rate and flow angle of the rinsing fluid delivered to the front side can be adjusted to offset the layer of dissolving fluid onto the edge and/or frontside of the substrate. In some instances, the dissolving fluid may be used initially without the rinsing fluid to obtain the edge and/or edge exclusion zone removal, followed by the rinsing/dissolving process described above.
- The
SRD module 236 is connected between theloading station 210 and themainframe 214. Themainframe transfer station 216 includes amainframe transfer robot 242. Preferably, themainframe transfer robot 242 comprises a plurality ofindividual robot arms 244 that provides independent access of substrates in theprocessing stations 218 and theSRD stations 212. As shown in FIG. 3, themainframe transfer robot 242 comprises tworobot arms 244, corresponding to the number ofprocess cells 240 perprocessing station 218. Eachrobot arm 244 includes arobot blade 246 for holding a substrate during a substrate transfer. Preferably, eachrobot arm 244 is operable independently of the other arm to facilitate independent transfers of substrates in the system. Alternatively, therobot arms 244 operate in a coordinated fashion such that one robot extends as the other robot arm retracts. - Preferably, the
mainframe transfer station 216 includes aflipper robot 248 that facilitates transfer of a substrate from a face-up position on therobot blade 246 of themainframe transfer robot 242 to a face down position for aprocess cell 240 that requires face-down processing of substrates. Theflipper robot 248 includes amain body 250 that provides both vertical and rotational movements with respect to a vertical axis of themain body 250 and aflipper robot arm 252 that provides rotational movement along a horizontal plane along theflipper robot arm 252. Preferably, avacuum suction gripper 254, disposed at the distal end of theflipper robot arm 252, holds the substrate as the substrate is flipped and transferred by theflipper robot 248. Theflipper robot 248 positions asubstrate 234 into theprocess cell 240 for face-down processing. The details of the electroplating process cell will be discussed below. - FIG. 24 is a top schematic view of a mainframe transfer robot having a flipper robot incorporated therein. The
mainframe transfer robot 242 as shown in FIG. 24 serves to transfer substrates between different stations attached the mainframe station, including the processing stations and the SRD stations. Themainframe transfer robot 242 includes a plurality of robot arms 2402 (two shown), and a flippertype end effector 2404 is attached as an end effector for each of therobot arms 2402. Flipper robots are generally known in the art and can be attached as end effectors for substrate handling robots, such as model RR701, available from Rorze Automation, Inc., located in Milpitas, Calif. Themain transfer robot 242 has a flipper robot as the end effector is capable of transferring substrates between different stations attached to the mainframe as well as flipping the substrate being transferred to the desired surface orientation, i.e., substrate processing surface being face-down for the electroplating process. Preferably, themainframe transfer robot 242 provides independent robot motion along the X-Y-Z axes by therobot arm 2402 and independent substrate flipping rotation by the flipperrobot end effector 2404. By incorporating theflipper robot 2404 as the end effector of the mainframe transfer robot, the substrate transfer process is simplified because the step of passing a substrate from a mainframe transfer robot to a flipper robot is eliminated. - FIG. 6 is a cross sectional view of one embodiment of an
electroplating process cell 400. Theelectroplating process cell 400 as shown in FIG. 6 is the same as theelectroplating process cell 240 as shown in FIGS. 2 and 3. Theprocess cell 400 generally comprises ahead assembly 410, aprocess kit 420 and anelectrolyte solution collector 440. Preferably, theelectrolyte solution collector 440 is secured onto thebody 442 of themainframe 214 over anopening 443 that defines the location for placement of theprocess kit 420. Theelectrolyte solution collector 440 includes aninner wall 446, anouter wall 448 and a bottom 447 connecting the walls. Anelectrolyte solution outlet 449 is disposed through thebottom 447 of theelectrolyte solution collector 440 and connected to the electrolyte solution replenishing system 220 (shown in FIG. 2) through tubes, hoses, pipes or other fluid transfer connectors. - The
head assembly 410 is mounted onto ahead assembly frame 452. Thehead assembly frame 452 includes a mountingpost 454 and acantilever arm 456. The mountingpost 454 is mounted onto thebody 442 of themainframe 214, and thecantilever arm 456 extends laterally from an upper portion of the mountingpost 454. Preferably, the mountingpost 454 provides rotational movement with respect to a vertical axis along the mounting post to allow rotation of thehead assembly 410. Thehead assembly 410 is attached to a mounting plate 460 disposed at the distal end of thecantilever arm 456. The lower end of thecantilever arm 456 is connected to acantilever arm actuator 457, such as a pneumatic cylinder, mounted on the mountingpost 454. Thecantilever arm actuator 457 provides pivotal movement of thecantilever arm 456 with respect to the joint between thecantilever arm 456 and the mountingpost 454. When thecantilever arm actuator 457 is retracted, thecantilever arm 456 moves thehead assembly 410 away from theprocess kit 420 to provide the spacing required to remove and/or replace theprocess kit 420 from theelectroplating process cell 400. When thecantilever arm actuator 457 is extended, thecantilever arm 456 moves thehead assembly 410 toward theprocess kit 420 to position the substrate in thehead assembly 410 in a processing position. - The
head assembly 410 generally comprises asubstrate holder assembly 450 and asubstrate assembly actuator 458. Thesubstrate assembly actuator 458 is mounted onto the mounting plate 460, and includes ahead assembly shaft 462 extending downwardly through the mounting plate 460. The lower end of thehead assembly shaft 462 is connected to thesubstrate holder assembly 450 to position thesubstrate holder assembly 450 in a processing position and in a substrate loading position. - The
substrate holder assembly 450 generally comprises asubstrate holder 464 and acathode contact ring 466. FIG. 7 is a cross sectional view of one embodiment of acathode contact ring 466. In general, thecontact ring 466 comprises an annular body having a plurality of conducting members disposed thereon. The annular body is constructed of an insulating material to electrically isolate the plurality of conducting members. Together the body and conducting members form a diametrically interior substrate seating surface which, during processing, supports a substrate and provides a current thereto. - Referring now to FIG. 7 in detail, the
contact ring 466 generally comprises a plurality of conductingmembers 765 at least partially disposed within an annularinsulative body 770. Theinsulative body 770 is shown having aflange 762 and a downwardsloping shoulder portion 764 leading to asubstrate seating surface 768 located below theflange 762. Theflange 762 and thesubstrate seating surface 768 lie in offset and substantially parallel planes. Thus, theflange 762 may be understood to define a first plane while thesubstrate seating surface 768 defines a second plane parallel to the first plane wherein theshoulder 764 is disposed between the two planes. However, contact ring design shown in FIG. 7 is intended to be merely illustrative. In another embodiment, theshoulder portion 764 may be of a steeper angle including a substantially vertical angle so as to be substantially normal to both theflange 762 and thesubstrate seating surface 768. Alternatively, thecontact ring 466 may be substantially planar thereby eliminating theshoulder portion 764. However, for reasons described below, one embodiment comprises theshoulder portion 764 shown in FIG. 6 or some variation thereof. - The conducting
members 765 are defined by a plurality of outerelectrical contact pads 780 annularly disposed on theflange 762, a plurality of innerelectrical contact pads 772 disposed on a portion of thesubstrate seating surface 768, and a plurality of embedded conductingconnectors 776 which link thepads members 765 are isolated from one another by theinsulative body 770. The insulative body may be made of a plastic such as polyvinylidenefluoride (PVDF), perfluoroalkoxy resin (PFA), TEFLON® (a registered trademark of the E. I duPont de Nemoirs and Company of Wilmingtopn, Del.), and TEFZEL® (a registered trademark of the E. I duPont de Nemoirs and Company of Wilmingtopn, Del.), or any other insulating material such as Alumina (Al2O3) or other ceramics. Theouter contact pads 780 are coupled to a power supply (not shown) to deliver current and voltage to theinner contact pads 772 via theconnectors 776 during processing. In turn, theinner contact pads 772 supply the current and voltage to a substrate by maintaining contact around a peripheral portion of the substrate. Thus, in operation the conductingmembers 765 act as discrete current paths electrically connected to a substrate. - Low resistivity, and conversely high conductivity, are directly related to good plating. To ensure low resistivity, the conducting
members 765 are preferably made of copper (Cu), platinum (Pt), tantalum (Ta), titanium (Ti), gold (Au), silver (Ag), stainless steel or other conducting materials. Low resistivity and low contact resistance may also be achieved by coating the conductingmembers 765 with a conducting material. Thus, the conductingmembers 765 may, for example, be made of copper (resistivity for copper is approximately 2×10−8 Ω·m) and be coated with platinum (resistivity for platinum is approximately 10.6×10−8 Ω·m). Coatings such as tantalum nitride (TaN), titanium nitride (TiN), rhodium (Rh), Au, Cu, or Ag on a conductive base materials such as stainless steel, molybdenum (Mo), Cu, and Ti are also possible. Further, since thecontact pads connectors 776, thecontact pads members 765 another, such as stainless steel. Either or both of thepads 772, 180 and conductingconnectors 776 may be coated with a conducting material. Additionally, because plating repeatability may be adversely affected by oxidation that acts as an insulator, theinner contact pads 772 preferably comprise a material resistant to oxidation such as Pt, Ag, or Au. - In addition to being a function of the contact material, the total resistance of each circuit is dependent on the geometry, or shape, of the inner contact
inner contact pads 772 and the force supplied by thecontact ring 466. These factors define a constriction resistance, RCR, at the interface of theinner contact pads 772 and thesubstrate seating surface 768 due to asperities between the two surfaces. Generally, as the applied force is increased the apparent area is also increased. The apparent area is, in turn, inversely related to RCR so that an increase in the apparent area results in a decreased RCR. Thus, to minimize overall resistance it is preferable to maximize force. The maximum force applied in operation is limited by the yield strength of a substrate which may be damaged under excessive force and resulting pressure. However, because pressure is related to both force and area, the maximum sustainable force is also dependent on the geometry of theinner contact pads 772. Thus, while thecontact pads 772 may have a flat upper surface as in FIG. 7, other shapes may be used to advantage. For example, two preferred shapes are shown in FIGS. 8 and 9. FIG. 8 shows a knife-edge contact pad and FIG. 9 shows a hemispherical contact pad. A person skilled in the art will readily recognize other shapes which may be used to advantage. A more complete discussion of the relation between contact geometry, force, and resistance is given in Ney Contact Manual, by Kenneth E. Pitney, The J. M. Ney Company, 1973, which is hereby incorporated by reference in its entirety. - The number of
connectors 776 may be varied depending on the particular number of contact pads 772 (shown in FIG. 7) desired. For a 200 mm substrate, preferably at least twenty-fourconnectors 776 are spaced equally over 360°. However, as the number of connectors reaches a critical level, the compliance of the substrate relative to thecontact ring 466 is adversely affected. Therefore, while more than twenty-fourconnectors 776 may be used, contact uniformity may eventually diminish depending on the topography of thecontact pads 772 and the substrate stiffness. Similarly, while less thantwentyfour connectors 776 may be used, current flow is increasingly restricted and localized, leading to poor plating results. Since the dimensions of the components of the process cell are readily altered to suit a particular application (for example, a 300 mm substrate), the optimal number may easily be determined for varying scales and embodiments. - As shown in FIG. 10, the
substrate seating surface 768 comprises anisolation gasket 782. The isolation gasket is disposed on theinsulative body 770 and extends diametrically interior to theinner contact pads 772 to define the inner diameter of thecontact ring 466. Theisolation gasket 782 preferably extends slightly above the inner contact pads 772 (e.g., a few mils) and preferably comprises an elastomer such as VITON® (a registered trademark of the E. I duPont de Nemoirs and Company of Wilmingtopn, Del.), TEFLON®, buna rubber and the like. Where theinsulative body 770 also comprises an elastomer theisolation gasket 782 may be of the same material. In the latter embodiment, theisolation gasket 782 and theinsulative body 770 may be monolithic, i.e., formed as a single piece. However, theisolation gasket 782 is preferably separate from theinsulative body 770 so that it may be easily removed for replacement or cleaning. - While FIG. 10 shows one embodiment of the
isolation gasket 782 wherein the isolation gasket is seated entirely on theinsulative body 770, FIGS. 8 and 9 show an alternative embodiment. In the latter embodiment, theinsulative body 770 is partially machined away to expose the upper surface of the connectingmember 776 and theisolation gasket 782 is disposed thereon. Thus, theisolation gasket 782 contacts a portion of the connectingmember 776. This design requires less material to be used for theinner contact pads 772 that may be advantageous where material costs are significant such as when theinner contact pads 772 comprise gold. Persons skilled in the art will recognize other embodiments that do not depart from the scope of the present invention. - During processing, the
isolation gasket 782 maintains contact with a peripheral portion of the substrate plating surface and is compressed to provide a seal between the remainingcathode contact ring 466 and the substrate. The seal prevents the electrolyte solution from contacting the edge and backside of the substrate. As noted above, maintaining a clean contact surface is necessary to achieving high plating repeatability. Previous contact ring designs did not provide consistent plating results because contact surface topography varied over time. The contact ring eliminates, or substantially minimizes, deposits which would otherwise accumulate on theinner contact pads 772 and change their characteristics thereby producing highly repeatable, consistent, and uniform plating across the substrate plating surface. - FIG. 11 is a simplified schematic diagram representing a possible configuration of the electrical circuit for the
contact ring 466. To provide a uniform current distribution between the conductingmembers 765, anexternal resistor 700 is connected in series with each of the conductingmembers 765. Preferably, the resistance value of the external resistor 700 (represented as REXT) is much greater than the resistance of any other component of the circuit. As shown in FIG. 11, the electrical circuit through each conductingmember 765 is represented by the resistance of each of the components connected in series with thepower supply 702. RE represents the resistance of the electrolyte solution, which is typically dependent on the distance between the anode and the cathode contact ring and the chemical composition of the electrolyte solution. Thus, RA represents the resistance of the electrolyte solution adjacent the substrate plating surface 754. RS represents the resistance of the substrate plating surface 754, and RC represents the resistance of thecathode conducting members 765 plus the constriction resistance resulting at the interface between theinner contact pads 772 and the substrate plating layer 754. Generally, the resistance value of the external resistor (REXT) is at least as much as ΣR (where ΣR equals the sum of RE, RA, RS and RC). Preferably, the resistance value of the external resistor (REXT) is much greater than ΣR such that ΣR is negligible and the resistance of each series circuit approximates REXT. - Typically, one power supply is connected to all of the
outer contact pads 780 of thecathode contact ring 466, resulting in parallel circuits through theinner contact pads 772. However, as the inner contact pad-to-substrate interface resistance varies with eachinner contact pad 772, more current will flow, and thus more plating will occur, at the site of lowest resistance. However, by placing an external resistor in series with each conductingmember 765, the value or quantity of electrical current passed through each conductingmember 765 becomes controlled mainly by the value of the external resistor. As a result, the variations in the electrical properties between each of theinner contact pads 772 do not affect the current distribution on the substrate. The uniform current density applied across the plating surface contributes to a uniform plating thickness of the metal film deposited on the seed layer on the substrate. The external resistors also provide a uniform current distribution between different substrates of a process-sequence. - Although the
contact ring 466 is designed to resist deposit buildup on theinner contact pads 772, over multiple substrate plating cycles the substrate-pad interface resistance may increase, eventually reaching an unacceptable value. An electronic sensor/alarm 704 can be connected across theexternal resistor 700 to monitor the voltage/current across the external resistor to address this problem. If the voltage/current across theexternal resistor 700 falls outside of a preset operating range that is indicative of a high substrate-pad resistance, the sensor/alarm 704 triggers corrective measures such as shutting down the plating process until the problems are corrected by an operator. Alternatively, a separate power supply can be connected to each conductingmember 765 and can be separately controlled and monitored to provide a uniform current distribution across the substrate. A very smart system (VSS) may also be used to modulate the current flow. The VSS typically comprises a processing unit and any combination of devices known in the industry used to supply and/or control current such as variable resistors, separate power supplies, etc. As the physiochemical, and hence electrical, properties of theinner contact pads 772 change over time, the VSS processes and analyzes data feedback. The data is compared to pre-established setpoints and the VSS then makes appropriate current and voltage alterations to ensure uniform deposition. - FIG. 18 is a perspective view of an alternative embodiment of a cathode contact ring. The
cathode contact ring 1800 as shown in FIG. 18 comprises a conductive metal or a metal alloy, such as stainless steel, copper, silver, gold, platinum, titanium, tantalum, and other conductive materials, or a combination of conductive materials, such as stainless steel coated with platinum. Thecathode contact ring 1800 includes anupper mounting portion 1810 adapted for mounting the cathode contact ring onto the substrate holder assembly and a lowersubstrate receiving portion 1820 adapted for receiving a substrate therein. Thesubstrate receiving portion 1820 includes an annularsubstrate seating surface 1822 having a plurality of contact pads orbumps 1824 disposed thereon and preferably evenly spaced apart. When a substrate is positioned on thesubstrate seating surface 1822, thecontact pads 1824 physically contact a peripheral region of the substrate to provide electrical contact to the electroplating seed layer on the substrate deposition surface. Preferably, thecontact pads 1824 are coated with a noble metal; such as platinum or gold, that is resistant to oxidation. - The exposed surfaces of the cathode contact ring, except the surfaces of the contact pads that come in contact with the substrate, are preferably treated to provide hydrophilic surfaces or coated with a material that exhibits hydrophilic properties. Hydrophilic materials and hydrophilic surface treatments are known in the art. One company providing a hydrophilic surface treatment is Millipore Corporation, located in Bedford, Mass. The hydrophilic surface significantly reduces beading of the electrolyte solution on the surfaces of the cathode contact ring and promotes smooth dripping of the electrolyte solution from the cathode contact ring after the cathode contact ring is removed from the electroplating bath or electrolyte solution. By providing hydrophilic surfaces on the cathode contact ring that facilitate run-off of the electrolyte solution, plating defects caused by residual electrolyte solution on the cathode contact ring are significantly reduced. The inventors also contemplate application of this hydrophilic treatment or coating in other embodiments of cathode contact rings to reduce residual electrolyte solution beading on the cathode contact ring and the plating defects on a subsequently processed substrate that may result therefrom.
- Referring to FIGS. 12 and 12A, the
substrate holder 464 is preferably positioned above thecathode contact ring 466 and comprises a bladder assembly 470 that provides pressure to the backside of a substrate and ensures electrical contact between the substrate plating surface and thecathode contact ring 466. The inflatable bladder assembly 470 is disposed on asubstrate holder plate 832. Abladder 836 disposed on a lower surface of thesubstrate holder plate 832 is thus located opposite and adjacent to the contacts on thecathode contact ring 466 with thesubstrate 821 interposed therebetween. Afluid source 838 supplies a fluid, i.e., a gas or liquid, to thebladder 836 allowing thebladder 836 to be inflated to varying degrees. - Referring now to FIGS. 12, 12A, and13, the details of the bladder assembly 470 will be discussed. The
substrate holder plate 832 is shown as substantially disc-shaped having anannular recess 840 formed on a lower surface and a centrally disposedvacuum port 841. One ormore inlets 842 are formed in thesubstrate holder plate 832 and lead into the relatively enlargedannular mounting channel 843 and theannular recess 840. Quick-disconnect hoses 844 couple thefluid source 838 to theinlets 842 to provide a fluid thereto. Thevacuum port 841 is preferably attached to a vacuum/pressure pumping system 859 adapted to selectively supply a pressure or create a vacuum at a backside of thesubstrate 821. Thepumping system 859, shown in FIG. 12, comprises a pump 845, across-over valve 847, and a vacuum ejector 849 (commonly known as a venturi). One vacuum ejector that may be used to advantage is available from SMC Pneumatics, Inc., of Indianapolis, Ind. The pump 845 may be a commercially available compressed gas source and is coupled to one end of a hose 851, the other end of the hose 851 being coupled to thevacuum port 841. The hose 851 is split into apressure line 853 and avacuum line 855 having thevacuum ejector 849 disposed therein. Fluid flow is controlled by thecross-over valve 847 which selectively switches communication with the pump 845 between thepressure line 853 and thevacuum line 855. Preferably, the cross-over valve has an OFF setting whereby fluid is restricted from flowing in either direction through hose 851. A shut-offvalve 861 disposed in hose 851 prevents fluid from flowing frompressure line 855 upstream through thevacuum ejector 849. The desired direction of fluid flow is indicated by arrows. - Persons skilled in the art will readily appreciate other arrangements which do not depart from the spirit and scope of the present invention. For example, where the
fluid source 838 is a gas supply it may be coupled to hose 851 thereby eliminating the need for a separate compressed gas supply, i.e., pump 845. Further, a separate gas supply and vacuum pump may supply the backside pressure and vacuum conditions. While it is preferable to allow for both a backside pressure as well as a backside vacuum, a simplified embodiment may comprise a pump capable of supplying only a backside vacuum. However, as will be explained below, deposition uniformity may be improved where a backside pressure is provided during processing. Therefore, an arrangement such as the one described above including a vacuum ejector and a cross-over valve is preferred. - Referring now to FIGS. 12A and 14, a substantially circular ring-shaped
manifold 846 is disposed in theannular recess 840. The manifold 846 comprises a mountingrail 852 disposed between aninner shoulder 848 and anouter shoulder 850. The mountingrail 852 is adapted to be at least partially inserted into theannular mounting channel 843. A plurality offluid outlets 854 formed in the manifold 846 provide communication between theinlets 842 and thebladder 836.Seals 837, such as O-rings, are disposed in theannular manifold channel 843 in alignment with theinlet 842 andoutlet 854 and secured by thesubstrate holder plate 832 to ensure an airtight seal. Conventional fasteners (not shown) such as screws may be used to secure the manifold 846 to thesubstrate holder plate 832 via cooperating threaded bores (not shown) formed in the manifold 846 and thesubstrate holder plate 832. - Referring now to FIG. 15, the
bladder 836 is shown, in section, as an elongated substantially semi-tubular piece of material having annular lip seals 856, or nodules, at each edge. In FIG. 12A, the lip seals 856 are shown disposed on theinner shoulder 848 and theouter shoulder 850. A portion of thebladder 836 is compressed against the walls of theannular recess 840 by the manifold 846 which has a width slightly less (e.g. a few millimeters) than theannular recess 840. Thus, the manifold 846, thebladder 836, and theannular recess 840 cooperate to form a fluid-tight seal. To prevent fluid loss, thebladder 836 is preferably comprised of some fluid impervious material such as silicon rubber or any comparable elastomer which is chemically inert with respect to the electrolyte solution and exhibits reliable elasticity. Where needed a compliant covering 857 may be disposed over thebladder 836, as shown in FIG. 15, and secured by means of an adhesive or thermal bonding. The covering 857 preferably comprises an elastomer such as Viton™, buna rubber or the like, which may be reinforced by Kevlar™, for example. In one embodiment, the covering 857 and thebladder 836 comprise the same material. The covering 857 has particular application where thebladder 836 is liable to rupturing. Alternatively, thebladder 836 thickness may simply be increased during its manufacturing to reduce the likelihood of puncture. Preferably, the exposed surface of the bladder 836 (if uncovered) and the exposed surface of the covering 857 are coated or treated to provide a hydrophilic surface (as discussed above for the surfaces of the cathode contact ring). This coating promotes dripping and removal of the residual electrolyte solution after the head assembly is lifted above the process cell. - The precise number of
inlets 842 andoutlets 854 may be varied according to the particular application. For example, while FIG. 12 shows two inlets with corresponding outlets, an alternative embodiment could employ a single fluid inlet which supplies fluid to thebladder 836. - In operation, the
substrate 821 is introduced into the container body 802 by securing it to the lower side of thesubstrate holder plate 832. This is accomplished by engaging the pumping system 159 to evacuate the space between thesubstrate 821 and thesubstrate holder plate 832 viaport 841 thereby creating a vacuum condition. Thebladder 836 is then inflated by supplying a fluid such as air or water from thefluid source 838 to theinlets 842. The fluid is delivered into thebladder 836 via themanifold outlets 854, thereby pressing thesubstrate 821 uniformly against the contacts of thecathode contact ring 466. The electroplating process is then carried out. Electrolyte solution is then pumped into theprocess kit 420 toward thesubstrate 821 to contact the exposedsubstrate plating surface 820. The power supply provides a negative bias to thesubstrate plating surface 820 via thecathode contact ring 466. As the electrolyte solution is flowed across thesubstrate plating surface 820, ions in the electrolytic solution are attracted to thesurface 820 and deposit on thesurface 820 to form the desired film. - Because of its flexibility, the
bladder 836 deforms to accommodate the asperities of the substrate backside and contacts of thecathode contact ring 466 thereby mitigating misalignment with the conductingcathode contact ring 466. Thecompliant bladder 836 prevents the electrolyte solution from contaminating the backside of thesubstrate 821 by establishing a fluid tight seal at a perimeter portion of a backside of thesubstrate 821. Once inflated, a uniform pressure is delivered downward toward thecathode contact ring 466 to achieve substantially equal force at all points where thesubstrate 821 andcathode contact ring 466 interface. The force can be varied as a function of the pressure supplied by thefluid source 838. Further, the effectiveness of the bladder assembly 470 is not dependent on the configuration of thecathode contact ring 466. For example, while FIG. 12 shows a pin configuration having a plurality of discrete contact points, thecathode contact ring 466 may also be a continuous surface. - Because the force delivered to the
substrate 821 by thebladder 836 is variable, adjustments can be made to the current flow supplied by thecontact ring 466. As described above, an oxide layer may form on thecathode contact ring 466 and act to restrict current flow. However, increasing the pressure of thebladder 836 may counteract the current flow restriction due to oxidation. As the pressure is increased, the malleable oxide layer is compromised and superior contact between thecathode contact ring 466 and thesubstrate 821 results. The effectiveness of thebladder 836 in this capacity may be further improved by altering the geometry of thecathode contact ring 466. For example, a knife-edge geometry is likely to penetrate the oxide layer more easily than a dull rounded edge or flat edge. - Additionally, the fluid tight seal provided by the
inflated bladder 836 allows the pump 845 to maintain a backside vacuum or pressure either selectively or continuously, before, during, and after processing. Generally, however, the pump 845 is run to maintain a vacuum only during the transfer of substrates to and from theelectroplating process cell 400 because it has been found that thebladder 836 is capable of maintaining the backside vacuum condition during processing without continuous pumping. Thus, while inflating thebladder 836, as described above, the backside vacuum condition is simultaneously relieved by disengaging thepumping system 859, e.g., by selecting an OFF position on thecross-over valve 847. Disengaging thepumping system 859 may be abrupt or comprise a gradual process whereby the vacuum condition is ramped down. Ramping allows for a controlled exchange between the inflatingbladder 836 and the simultaneously decreasing backside vacuum condition. This exchange may be controlled manually or by computer. - As described above, continuous backside vacuum pumping while the
bladder 836 is inflated is not needed and may actually cause thesubstrate 820 to buckle or warp leading to undesirable deposition results. It may be desirable to provide a backside pressure to thesubstrate 820 in order to cause a “bowing” effect of the substrate to be processed. Bowing the substrate results in superior deposition. Thus,pumping system 859 is capable of selectively providing a vacuum or pressure condition to the substrate backside. For a 200 mm substrate a backside pressure up to 5 psi is preferable to bow the substrate. Because substrates typically exhibit some measure of pliability, a backside pressure causes the substrate to bow or assume a convex shape relative to the upward flow of the electrolyte solution. The degree of bowing is variable according to the pressure supplied by pumpingsystem 859. - Those skilled in the art will readily recognize other embodiments that are contemplated. For example, while FIG. 12A shows one embodiment of a
bladder 836 having a surface area sufficient to cover a relatively small perimeter portion of the substrate backside at a diameter substantially equal to thecathode contact ring 466. The geometric configuration of the bladder assembly 470 can be varied. Thus, the bladder assembly may be constructed using more fluid impervious material to cover an increased surface area of thesubstrate 821. - FIG. 19 is a partial cross sectional view of an alternative embodiment of a substrate holder assembly. The alternative
substrate holder assembly 1900 comprises a bladder assembly 470, as described above, having theinflatable bladder 836 attached to the back surface of an intermediarysubstrate holder plate 1910. Preferably, a portion of theinflatable bladder 836 is sealingly attached to theback surface 1912 of the intermediarysubstrate holder plate 1910 using an adhesive or other bonding material. The front surface 1914 of the intermediarysubstrate holder plate 1910 is adapted to receive asubstrate 821 to be processed. An elastomeric o-ring 1916 is disposed in anannular groove 1918 on the front surface 1914 of the intermediarysubstrate holder plate 1910 to contact a peripheral portion of the substrate back surface. The elastomeric o-ring 1916 provides a seal between the substrate back surface and the front surface of the intermediary substrate holder plate. Preferably, the intermediary substrate holder plate includes a plurality of bores orholes 1920 extending through the plate that are in fluid communication with thevacuum port 841. The plurality ofholds 1920 facilitate securing the substrate on the substrate holder using a vacuum force applied to the backside of the substrate. According to this alternative embodiment of the substrate holder assembly, the inflatable bladder does not directly contact a substrate being processed, and thus the risk of cutting or damaging the inflatable bladder during substrate transfers is significantly reduced. The elastomeric O-ring 1916 is preferably coated or treated to provide a hydrophilic surface (as discussed above for the surfaces of the cathode contact ring) for contacting the substrate. The elastomeric O-ring 1916 is replaced as needed to ensure proper contact and seal to the substrate. - FIG. 25 is an alternative embodiment of the process head assembly having a
rotatable head assembly 2410. Preferably, a rotational actuator is disposed on the cantilevered arm and attached to the head assembly to rotate the head assembly during substrate processing. Therotatable head assembly 2410 is mounted onto ahead assembly frame 2452. The alternativehead assembly frame 2452 and therotatable head assembly 2410 are mounted onto the mainframe similarly to thehead assembly frame 452 andhead assembly 410 as shown in FIG. 6 and described above. Thehead assembly frame 2452 includes a mountingpost 2454, apost cover 2455, and acantilever arm 2456. The mountingpost 2454 is mounted onto the body of themainframe 214, and thepost cover 2455 covers a top portion of the mountingpost 2454. Preferably, the mountingpost 454 provides rotational movement (as indicated by arrow A1) with respect to a vertical axis along the mounting post to allow rotation of thehead assembly frame 2452. Thecantilever arm 2456 extends laterally from an upper portion of the mountingpost 2454 and is pivotally connected to thepost cover 2455 at the pivot joint 2459. Therotatable head assembly 2410 is attached to a mountingslide 2460 disposed at the distal end of thecantilever arm 2456. The mountingslide 2460 guides the vertical motion of thehead assembly 2410. Ahead lift actuator 2458 is disposed on top of the mountingslide 2460 to provide vertical displacement of thehead assembly 2410. - The lower end of the
cantilever arm 2456 is connected to theshaft 2453 of acantilever arm actuator 2457, such as a pneumatic cylinder or a lead-screw actuator, mounted on the mountingpost 2454. Thecantilever arm actuator 2457 provides pivotal movement (as indicated by arrow A2) of thecantilever arm 2456 with respect to the joint 2459 between thecantilever arm 2456 and thepost cover 2454. When thecantilever arm actuator 2457 is retracted, thecantilever arm 2456 moves thehead assembly 2410 away from theprocess kit 420. The movement of thehead assembly 2410 provide the spacing required to remove and/or replace theprocess kit 420 from theelectroplating process cell 240. When thecantilever arm actuator 2457 is extended, thecantilever arm 2456 moves thehead assembly 2410 toward theprocess kit 420 to position the substrate in thehead assembly 2410 in a processing position. - The
rotatable head assembly 2410 includes arotating actuator 2464 slideably connected to the mountingslide 2460. Theshaft 2468 of thehead lift actuator 2458 is inserted through a lift guide 2466 attached to the body of therotating actuator 2464. Preferably, theshaft 2468 is a lead-screw type shaft that moves the lift guide (as indicated by arrows A3) between various vertical positions. Therotating actuator 2464 is connected to thesubstrate holder assembly 2450 through theshaft 2470 and rotates the substrate holder assembly 2450 (as indicated by arrows A4). Thesubstrate holder assembly 2450 includes a bladder assembly, such as the embodiments described above with respect to FIGS. 12-15 and 19, and a cathode contact ring, such as the embodiments described above with respect to FIGS. 7-10 and 18. - The rotation of the substrate during the electroplating process generally enhances the deposition results. Preferably, the head assembly is rotated between about 2 rpm and about 20 rpm during the electroplating process. The head assembly can also be rotated. The head assembly can be lowered to position the seed layer on the substrate in contact with the electrolyte solution in the process cell. The head assembly is raised to remove the seed layer on the substrate from the electrolyte solution in the process cell. The head assembly is preferably rotated at a high speed (i.e., >20 rpm) after the head assembly is lifted from the process cell to enhance removal of residual electrolyte solution on the head assembly.
- In one embodiment, the uniformity of the deposited film has been improved within about 2% (i.e., maximum deviation of deposited film thickness is at about 2% of the average film thickness) while standard electroplating processes typically achieves uniformity at best within about 5.5%. However, rotation of the head assembly is not necessary to achieve uniform electroplating deposition in some instances, particularly where the uniformity of electroplating deposition is achieved by adjusting the processing parameters, such as the chemicals in the electrolyte solution, electrolyte solution flow and other parameters.
- Referring back to FIG. 6, a cross sectional view of an
electroplating process cell 400, thesubstrate holder assembly 450 is positioned above theprocess kit 420. Theprocess kit 420 generally comprises abowl 430, acontainer body 472, ananode assembly 474 and afilter 476. Preferably, theanode assembly 474 is disposed below thecontainer body 472 and attached to a lower portion of thecontainer body 472, and thefilter 476 is disposed between theanode assembly 474 and thecontainer body 472. Thecontainer body 472 is preferably a cylindrical body comprised of an electrically insulative material, such as ceramics, plastics, PLEXIGLAS® (acrylic), lexane, PVC, CPVC, and PVDF. Alternatively, thecontainer body 472 can be made from a coated metal, such as stainless steel, nickel and titanium. The coated metal is coated with an insulating layer (such as TEFLON®, PVDF, plastic, rubber and other combinations of materials) that do not dissolve in the electrolyte solution. The insulating layer can be electrically insulated from the electrodes (i.e., the anode and cathode of the electroplating system). Thecontainer body 472 is preferably sized and adapted to conform to the substrate plating surface and the shape of the of a substrate being processed through the system, typically circular or rectangular in shape. One preferred embodiment of thecontainer body 472 comprises a cylindrical ceramic tube having an inner diameter that has about the same dimension as or slightly larger than the substrate diameter. The inventors have discovered that the rotational movement typically required in typical electroplating systems is not required to achieve uniform plating results when the size of the container body conforms to about the size of the substrate plating surface. - An upper portion of the
container body 472 extends radially outwardly to form anannular weir 478. Theweir 478 extends over theinner wall 446 of theelectrolyte solution collector 440 and allows the electrolyte solution to flow into theelectrolyte solution collector 440. The upper surface of theweir 478 preferably matches the lower surface of thecathode contact ring 466. Preferably, the upper surface of theweir 478 includes an inner annularflat portion 480, a middleinclined portion 482 and an outer declinedportion 484. When a substrate is positioned in the processing position, the substrate plating surface is positioned above the cylindrical opening of thecontainer body 472. A gap for electrolyte solution flow is formed between the lower surface of thecathode contact ring 466 and the upper surface of theweir 478. The lower surface of thecathode contact ring 466 is disposed above the innerflat portion 480 and the middle inclined portion of theweir 478. The outer declinedportion 484 is sloped downwardly to facilitate flow of the electrolyte solution into theelectrolyte solution collector 440. - A lower portion of the
container body 472 extends radially outwardly to form a lowerannular flange 486 for securing thecontainer body 472 to thebowl 430. The outer dimension (i.e., circumference) of theannular flange 486 is smaller than the dimensions of theopening 444 and the inner circumference of theelectrolyte solution collector 440. The smaller dimension of the annular flange to allow removal and replacement of theprocess kit 420 from theelectroplating process cell 400. Preferably,multiple bolts 488 are fixedly disposed on theannular flange 486 and extend downwardly through matching bolt holes on thebowl 430. A plurality ofremovable fastener nuts 490 secure theprocess kit 420 onto thebowl 430. Aseal 487, such as an elastomer O-ring, is disposed betweencontainer body 472 and thebowl 430 radially inwardly from thebolts 488 to prevent leaks from theprocess kit 420. The nuts/bolts combination facilitates fast and easy removal and replacement of the components of theprocess kit 420 during maintenance. - Preferably, the
filter 476 is attached to and completely covers the lower opening of thecontainer body 472, and theanode assembly 474 is disposed below thefilter 476. A spacer 492 is disposed between thefilter 476 and theanode assembly 474. Preferably, thefilter 476, the spacer 492, and theanode assembly 474 are fastened to a lower surface of thecontainer body 472 using removable fasteners, such as screws and/or bolts. Alternatively, thefilter 476, the spacer 492, and theanode assembly 474 are removably secured to thebowl 430. - The
anode assembly 474 preferably comprises a consumable anode that serves as a metal source in the electrolyte solution. Alternatively, theanode assembly 474 comprises a non-consumable anode, and the metal to be electroplated is supplied within the electrolyte solution from the electrolytesolution replenishing system 220. As shown in FIG. 6, theanode assembly 474 is a self-enclosed module having a porous anode enclosure 494 preferably made of the same metal as the metal to be electroplated, such as copper. Alternatively, the anode enclosure 494 is made of porous materials, such as ceramics or polymeric membranes. A soluble metal 496, such as high purity copper for electrochemical deposition of copper, is disposed within the anode enclosure 494. The soluble metal 496 preferably comprises metal particles, wires or a perforated sheet. The porous anode enclosure 494 also acts as a filter that keeps the particulates generated by the dissolving metal within the anode enclosure 494. As compared to a non-consumable anode, the consumable (i.e., soluble) anode provides gas-generation-free electrolyte solution and minimizes the need to constantly replenish the metal in the electrolyte solution. - An
anode electrode contact 498 is inserted through the anode enclosure 494 to provide electrical connection to the soluble metal 496 from a power supply. Preferably, theanode electrode contact 498 is made from a conductive material that is insoluble in the electrolyte solution, such as titanium, platinum and platinum-coated stainless steel. Theanode electrode contact 498 extends through thebowl 430 and is connected to an electrical power supply. Preferably, the anodeelectrical contact 498 includes a threaded portion 497 (for afastener nut 499 to secure the anodeelectrical contact 498 to the bowl 430), and a seal 495 (such as a elastomer washer, is disposed between thefastener nut 499 and thebowl 430 to prevent leaks from the process kit 420). - The
bowl 430 generally comprises acylindrical portion 502 and abottom portion 504. An upperannular flange 506 extends radially outwardly from the top of thecylindrical portion 502. The upperannular flange 506 includes a plurality ofholes 508 that matches the number ofbolts 488 from the lowerannular flange 486 of thecontainer body 472.Bolts 488 are inserted through theholes 508, and thefastener nuts 490 are fastened onto thebolts 488 that secure the upperannular flange 506 of thebowl 430 to the lowerannular flange 486 of thecontainer body 472. Preferably, the outer dimension (i.e., circumference) of the upperannular flange 506 is about the same as the outer dimension (i.e., circumference) of the lowerannular flange 486. Preferably, the lower surface of the upperannular flange 506 of thebowl 430 rests on a support flange of themainframe 214 when theprocess kit 420 is positioned on themainframe 214. - The inner circumference of the
cylindrical portion 502 accommodates theanode assembly 474 and thefilter 476. Preferably, the outer dimensions of thefilter 476 and theanode assembly 474 are slightly smaller than the inner dimension of thecylindrical portion 502. These relative dimensions force a substantial portion of the electrolyte solution to flow through theanode assembly 474 first before flowing through thefilter 476. Thebottom portion 504 of thebowl 430 includes anelectrolyte solution inlet 510 that connects to an electrolyte solution supply line from the electrolytesolution replenishing system 220. Preferably, theanode assembly 474 is disposed about a middle portion of thecylindrical portion 502 of thebowl 430. Theanode assembly 474 is configured to provide a gap for electrolyte solution flow between theanode assembly 474 and theelectrolyte solution inlet 510 on thebottom portion 504. - The
electrolyte solution inlet 510 and the electrolyte solution supply line are preferably connected by a releasable connector that facilitates easy removal and replacement of theprocess kit 420. When theprocess kit 420 needs maintenance, the electrolyte solution is drained from theprocess kit 420, and the electrolyte solution flow in the electrolyte solution supply line is discontinued and drained. The connector for the electrolyte solution supply line is released from theelectrolyte solution inlet 510, and the electrical connection to theanode assembly 474 is also disconnected. Thehead assembly 410 is raised or rotated to provide clearance for removal of theprocess kit 420. Theprocess kit 420 is then removed from themainframe 214, and a new or reconditioned process kit is replaced into themainframe 214. - Alternatively, the
bowl 430 can be secured onto the support flange of themainframe 214, and thecontainer body 472 along with the anode and the filter are removed for maintenance. In this case, the nuts securing theanode assembly 474 and thecontainer body 472 to thebowl 430 are removed to facilitate removal of theanode assembly 474 and thecontainer body 472. New or reconditionedanode assembly 474 andcontainer body 472 are then replaced into themainframe 214 and secured to thebowl 430. - FIG. 20 is a cross sectional view of a first embodiment of an encapsulated anode. The encapsulated
anode 2000 includes a permeable anode enclosure that filters or traps “anode sludge” or particulates generated as the metal is dissolved from theanode plate 2004. As shown in FIG. 20, theanode plate 2004 comprises a solid piece of copper. Preferably, theanode plate 2004 is a high purity, oxygen free copper, enclosed in a hydrophilicanode encapsulation membrane 2002. Theanode plate 2004 is secured and supported by a plurality of electrical contacts or feed-throughs 2006 that extend through the bottom of thebowl 430. The electrical contacts or feed-throughs 2006 extend through theanode encapsulation membrane 2002 into the bottom surface of theanode plate 2004. The flow of the electrolyte solution is indicated by the arrows A from theelectrolyte solution inlet 510 disposed at the bottom of thebowl 430 through the gap between the anode and the bowl sidewall. The electrolyte solution also flows through theanode encapsulation membrane 2002 by permeation into and out of the gap between the anode encapsulation membrane and the anode plate, as indicated by the arrows B. Preferably, theanode encapsulation membrane 2002 comprises a hydrophilic porous membrane, such as a modified polyvinyllidene fluoride membrane, having porosity between about 60% and 80%, more preferably about 70%, and pore sizes between about 0.025 μm and about 1 μm, more preferably between about 0.1 μm and about 0.2 μm. One example of a hydrophilic porous membrane is the Durapore Hydrophilic Membrane, available from Millipore Corporation, located in Bedford, Mass. As the electrolyte solution flows through the encapsulation membrane, anode sludge and particulates generated by the dissolving anode are filtered or trapped by the encapsulation membrane. Thus, the encapsulation membranes improve the purity of the electrolyte solution during the electroplating process, and defect formations on the substrate during the electroplating process caused by anode sludge and contaminant particulates are significantly reduced. - FIG. 21 is a cross sectional view of a second embodiment of an encapsulated anode. Similar to the first embodiment of an encapsulated anode, the
anode plate 2004 is secured and supported on the electrical feed-throughs 2006. Atop encapsulation membrane 2008 and abottom encapsulation membrane 2010, disposed respectively above and below theanode plate 2004, are attached to amembrane support ring 2012 that is disposed around theanode plate 2004. The top andbottom encapsulation membranes membrane support ring 2012 preferably comprises a relatively rigid material (as compared to the encapsulation membrane), such as plastic or other polymers. Abypass fluid inlet 2014 is disposed through the bottom of thebowl 430 and through thebottom encapsulation membrane 2010 to introduce electrolyte solution into the gap between the encapsulation membranes and the anode plate. Abypass outlet 2016 is connected to themembrane support ring 2012 and extends through thebowl 430 to facilitate flow of excess electrolyte solution with the anode sludge or generated particulates out of the encapsulated anode into a waste drain (not shown). - Preferably, the flow of the electrolyte solution within the
bypass fluid inlet 2014 and the mainelectrolyte solution inlet 510 are individually controlled byflow control valves flow control valves bypass fluid inlet 2014 is preferably maintained at a higher pressure than the pressure in the mainelectrolyte solution inlet 510. The flow of the electrolyte solution inside thebowl 430 from the mainelectrolyte solution inlet 510 is indicated by arrows A, and the flow of the electrolyte solution inside the encapsulatedanode 2000 is indicated by the arrows B. A portion of the electrolyte solution introduced into the encapsulated anode flows out of the encapsulated anode through thebypass outlet 2016. By providing a dedicated bypass electrolyte solution supply into the encapsulated anode, the anode sludge or particulates generated from the dissolving anode is continually removed from the anode, thereby improving the purity of the electrolyte solution during the electroplating process. - FIG. 22 is a cross sectional view of a third embodiment of an encapsulated anode. The third embodiment of an encapsulated
anode 2000 includes ananode plate 2004 secured and supported on a plurality of electrical feed-throughs 2006, a top and abottom encapsulation membrane membrane support ring 2012, and abypass outlet 2016 connected to themembrane support ring 2012 and extending through thebowl 430. This third embodiment of an encapsulated anode preferably comprises materials as described above for the first and second embodiments of an encapsulated anode. Thebottom encapsulation membrane 2010 according to the third embodiment includes one ormore openings 2024 disposed substantially above the mainelectrolyte solution inlet 510. Theopening 2024 is adapted to receive flow of electrolyte solution from the mainelectrolyte solution inlet 510 and is preferably about the same size as the internal circumference of the mainelectrolyte solution inlet 510. The flow of the electrolyte solution from the mainelectrolyte solution inlet 510 is indicated by the arrows A and the flow of the electrolyte solution within the encapsulated anode is indicated by the arrows B. A portion of the electrolyte solution flows out of the encapsulated anode through thebypass outlet 2016, carrying a portion of the anode sludge and particulates generated from anode dissolution. - FIG. 23 is a cross sectional view of a fourth embodiment of an encapsulated anode. The fourth embodiment of an encapsulated
anode 2000 includes ananode plate 2002 secured and supported on a plurality of electrical feed-throughs 2006, a top and abottom encapsulation membrane membrane support ring 2012, and abypass fluid inlet 2014 disposed through the bottom of thebowl 430 and through thebottom encapsulation membrane 2010 to introduce electrolyte solution into the gap between the encapsulation membranes and the anode plate. This fourth embodiment of an encapsulated anode preferably comprises materials as described above for the first and second embodiments of an encapsulated anode. Preferably, the flow of the electrolyte solution through thebypass fluid inlet 2014 and the mainelectrolyte solution inlet 510 are individually controlled bycontrol valves electrolyte solution inlet 510 is indicated by the arrows A while the flow of the electrolyte solution through the encapsulated anode is indicated by arrows B. For this embodiment, the anode sludge and particulates generated by the dissolving anode plate are filtered and trapped by the encapsulation membranes as the electrolyte solution passes through the membrane. - FIG. 16 is a schematic diagram of an electrolyte
solution replenishing system 220. The electrolytesolution replenishing system 220 provides the electrolyte solution to the electroplating process cells for the electroplating process. The electrolytesolution replenishing system 220 generally comprises a mainelectrolyte solution tank 602, adosing module 603, afiltration module 605, a chemical analyzer module 616, and an electrolyte solutionwaste disposal system 622 connected to the analyzing module 616 by an electrolytesolution waste drain 620. One or more controllers control the composition of the electrolyte solution in themain tank 602 and the operation of the electrolytesolution replenishing system 220. Preferably, the controllers are independently operable but integrated with thecontroller 222 of theelectroplating system platform 200. - The main
electrolyte solution tank 602 provides a reservoir for electrolyte solution and includes an electrolytesolution supply line 612 that is connected to each of the electroplating process cells through one or more fluid pumps 608 andvalves 607. Aheat exchanger 624 or a heater/chiller disposed in thermal connection with themain tank 602 controls the temperature of the electrolyte solution stored in themain tank 602. Theheat exchanger 624 is connected to and operated by thecontroller 610. - The
dosing module 603 is connected to themain tank 602 by a supply line and includes a plurality ofsource tanks 606, or feed bottles, a plurality ofvalves 609, and acontroller 611. Thesource tanks 606 contain the chemicals needed for composing the electrolyte solution and typically include a deionized water source tank and copper sulfate (CuSO4) source tank for composing the electrolyte solution.Other source tanks 606 may contain hydrogen sulfate (H2SO4), hydrogen chloride (HCl) and various additives such as glycol. Each source tank is preferably color coded and fitted with a unique mating outlet connector adapted to connect to a matching inlet connector in the dosing module. By color coding the source tanks and fitting the source tanks with unique connectors, errors caused by human operators when exchanging or replacing the source tanks are significantly reduced. - The deionized water source tank preferably also provides deionized water to the system for cleaning the system during maintenance. The
valves 609 associated with eachsource tank 606 regulate the flow of chemicals to themain tank 602 and may be any of numerous commercially available valves such as butterfly valves, throttle valves and the like. Activation of thevalves 609 is accomplished by thecontroller 611 which is preferably connected to thesystem control 222 to receive signals therefrom. - The electrolyte
solution filtration module 605 includes a plurality offilter tanks 604. An electrolytesolution return line 614 is connected between each of the process cells and one ormore filter tanks 604. Thefilter tanks 604 remove the undesired contents in the used electrolyte solution before returning the electrolyte solution to themain tank 602 for re-use. Themain tank 602 is also connected to thefilter tanks 604 to facilitate re-circulation and filtration of the electrolyte solution in themain tank 602. By re-circulating the electrolyte solution from themain tank 602 through thefilter tanks 604, the undesired contents in the electrolyte solution are continuously removed by thefilter tanks 604 to maintain a consistent level of purity. Additionally, re-circulating the electrolyte solution between themain tank 602 and thefiltration module 605 allows the various chemicals in the electrolyte solution to be thoroughly mixed. - The electrolyte
solution replenishing system 220 also includes a chemical analyzer module 616 that provides real-time chemical analysis of the chemical composition of the electrolyte solution. The analyzer module 616 is fluidly coupled to themain tank 602 by asample line 613 and to thewaste disposal system 622 by anoutlet line 621. The analyzer module 616 generally comprises at least one analyzer and a controller to operate the analyzer. The number of analyzers required for a particular processing tool depends on the composition of the electrolyte solution. For example, while a first analyzer may be used to monitor the concentrations of organic substances, a second analyzer is needed for inorganic chemicals. In the specific embodiment shown in FIG. 16 the chemical analyzer module 616 comprises anauto titration analyzer 615 and a cyclic voltametric stripper (CVS) 617. Both analyzers are commercially available from various suppliers. An auto titration analyzer which may be used to advantage is available from Parker Systems and a cyclic voltametric stripper is available from ECI. Theauto titration analyzer 615 determines the concentrations of inorganic substances such as copper chloride and acid. TheCVS 617 determines the concentrations of organic substances such as the various additives which may be used in the electrolyte solution and by-products resulting from the processing which are returned to themain tank 602 from the process cells. - The analyzer module shown FIG. 16 is merely illustrative. In another embodiment each analyzer may be coupled to the main electrolyte solution tank by a separate supply line and be operated by separate controllers. Persons skilled in the art will recognize other embodiments.
- In operation, a sample of electrolyte solution is flowed to the analyzer module616 via the
sample line 613. Although the sample may be taken periodically, preferably a continuous flow of electrolyte solution is maintained to the analyzer module 616. A portion of the sample is delivered to theauto titration analyzer 615 and a portion is delivered to theCVS 617 for the appropriate analysis. Thecontroller 619 initiates command signals to operate theanalyzers chemical analyzers controller 222. Thecontroller 222 processes the information and transmits signals that include user-defined chemical dosage parameters to thedosing controller 611. The received information is used to provide real-time adjustments to the source chemical replenishment rates by operating one or more of thevalves 609. The received information thereby maintains a desired, and preferably constant, chemical composition of the electrolyte solution throughout the electroplating process. The waste electrolyte solution from the analyzer module is then flowed to thewaste disposal system 622 via theoutlet line 621. - Although one embodiment utilizes real-time monitoring and adjustments of the electrolyte solution, various alternatives may be employed. For example, the
dosing module 603 may be controlled manually by an operator observing the output values provided by the chemical analyzer module 616. Preferably, the system software allows for both an automatic real-time adjustment mode as well as an operator (manual) mode. Further, although multiple controllers are shown in FIG. 16, a single controller may be used to operate various components of the system such as the chemical analyzer module 616, thedosing module 603, and theheat exchanger 624. Other embodiments will be apparent to those skilled in the art. - The electrolyte
solution replenishing system 220 also includes an electrolytesolution waste drain 620 connected to an electrolyte solutionwaste disposal system 622 for safe disposal of used electrolyte solutions, chemicals and other fluids used in the electroplating system. Preferably, the electroplating cells include a direct line connection to the electrolyte solution waste drain 620 (or the electrolyte solution waste disposal system 622). The electrolytesolution waste drain 620 drains the electroplating cells without returning the electrolyte solution through the electrolytesolution replenishing system 220. The electrolytesolution replenishing system 220 preferably also includes a bleed off connection to bleed off excess electrolyte solution to the electrolytesolution waste drain 620. - Preferably, the electrolyte
solution replenishing system 220 also includes one ormore degasser modules 630 adapted to remove undesirable gases from the electrolyte solution. The degasser module generally comprises a membrane that separates gases from the fluid passing through the degasser module and a vacuum system for removing the released gases. Thedegasser modules 630 are preferably placed in line on the electrolytesolution supply line 612 adjacent to theprocess cells 240. Thedegasser modules 630 are preferably positioned as close as possible to theprocess cells 240 so most of the gases from the electrolyte solution replenishing system are removed by the degasser modules before the electrolyte solution enters the process cells. Preferably, eachdegasser module 630 includes two outlets to supply degassed electrolyte solution to the twoprocess cells 240 of eachprocessing station 218. Alternatively, adegasser module 630 is provided for each process cell. The degasser modules can be placed at many other alternative positions. For example, the degasser module can be placed at other positions - in the electrolyte solution replenishing system, such as along with the filter section or in a closed-loop system with the main tank or with the process cell. As another example, one degasser module is placed in line with the electrolytesolution supply line 612 to provide degassed electrolyte solution to all of theprocess cells 240 of the electrochemical deposition system. Additionally, a separate degasser module is positioned in-line or in a closed-loop with the deionized water supply line and is dedicated for removing oxygen from the deionized water source. Because deionized water is used to rinse the processed substrates, free oxygen gases are preferable removed from the deionized water before reaching the SRD modules so that the electroplated copper is less likely to become oxidized by the rinsing process. Degasser modules are well known in the art and commercial embodiments are generally available and adaptable for use in a variety of applications. A commercially available degasser module is available from Millipore Corporation, located in Bedford, Mass. - One embodiment of the
degasser module 630, as shown in FIG. 26a, includes ahydrophobic membrane 632 having a fluid (i.e., electrolyte solution)passage 634 on one side of themembrane 632. Avacuum system 636 disposed on the opposite side of the membrane. Theenclosure 638 of the degasser module includes aninlet 640 and one ormore outlets 642. As the electrolyte solution passes through thedegasser module 630, the gases and other micro-bubbles in the electrolyte solution are separated from the electrolyte solution through the hydrophobic membrane and removed by the vacuum system. Another embodiment of thedegasser module 630′, as shown in FIG. 26b, includes a tube ofhydrophobic membrane 632′ and avacuum system 636 disposed around the tube ofhydrophobic membrane 632′. The electrolyte solution is introduced inside the tube of hydrophobic membrane, and as the electrolyte solution passes through thefluid passage 634 in the tube. The hydrophobic membrane separates gases and other micro-bubbles in the electrolyte solution, and a tube that is connected to thevacuum system 636 removes the separated gasses. More complex designs of degasser modules are contemplated, including designs having serpentine paths of the electrolyte solution across the membrane and other multi-sectioned designs of degasser modules. - Although not shown in FIG. 16, the electrolyte
solution replenishing system 220 may include a number of other components. For example, the electrolytesolution replenishing system 220 preferably also includes one or more additional tanks for storage of chemicals for a substrate cleaning system, such as the SRD station. Double-contained piping for hazardous material connections may also be employed to provide safe transport of the chemicals throughout the system. Optionally, the electrolytesolution replenishing system 220 includes connections to additional or external electrolyte solution processing system to provide additional electrolyte solution supplies to the electroplating system. - FIG. 17 is a cross sectional view of one embodiment of rapid thermal anneal (RTA) chamber. The
RTA chamber 211 is preferably connected to theloading station 210, and substrates are transferred into and out of theRTA chamber 211 by the loadingstation transfer robot 228. The electroplating system, as shown in FIGS. 2 and 3, preferably comprises twoRTA chambers 211 disposed on opposing sides of theloading station 210, corresponding to the symmetric design of theloading station 210. RTA chambers are generally well known in the art, and RTA chambers are typically utilized in substrate processing systems to enhance the properties of the deposited materials. A variety of RTA chamber designs may be utilized, including hot plate designs and heat lamp designs, to enhance the electroplating results. One particular applicable RTA chamber is the W×Z chamber available from Applied materials, Inc., located in Santa Clara, Calif. - The
RTA chamber 211 generally comprises anenclosure 902, aheater plate 904, aheater 907 and a plurality of substrate support pins 906. Theenclosure 902 includes abase 908, asidewall 910 and a top 912. Preferably, acold plate 913 is disposed below the top 912 of the enclosure. Alternatively, the cold plate is integrally formed as part of the top 912 of the enclosure. Preferably, areflector insulator dish 914 is disposed inside theenclosure 902 on thebase 908. Thereflector insulator dish 914 is typically made from a material such as quartz, alumina, or other material that can withstand high temperatures (i.e., greater than about 500° C.). The reflector insulator dish acts as a thermal insulator between theheater 907 and theenclosure 902. Thedish 914 may also be coated with a reflective material, such as gold, to direct heat back to theheater plate 906. - The
heater plate 904 preferably has a large mass compared to the substrate being processed in the system. The heater plate is preferably fabricated from a material such as silicon carbide, quartz, or other materials that do not react with any ambient gases in theRTA chamber 211 or with the substrate material. Theheater 907 typically comprises a resistive heating element or a conductive/radiant heat source and is disposed between theheated plate 906 and thereflector insulator dish 914. Theheater 907 is connected to apower source 916 which supplies the energy needed to heat theheater 907. Preferably, athermocouple 920 is disposed in aconduit 922, disposed through thebase 908 anddish 914, and extends into theheater plate 904. Thethermocouple 920 is connected to a controller (i.e., the system controller described below) and supplies temperature measurements to the controller. The controller then increases or decreases the heat supplied by theheater 907 according to the temperature measurements and the desired anneal temperature. - The
enclosure 902 preferably includes a coolingmember 918 disposed outside of theenclosure 902 in thermal contact with thesidewall 910 to cool theenclosure 902. Alternatively, one or more cooling channels (not shown) are formed within thesidewall 910 to control the temperature of theenclosure 902. Thecold plate 913 disposed on the inside surface of the top 912 cools a substrate that is positioned in close proximity to thecold plate 913. - The
RTA chamber 211 includes aslit valve 922 disposed on thesidewall 910 of theenclosure 902 for facilitating transfers of substrates into and out of the RTA chamber. Theslit valve 922 selectively seals anopening 924 on thesidewall 910 of the enclosure that communicates with theloading station 210. The loading station transfer robot 228 (see FIG. 2) transfers substrates into and out of the RTA chamber through theopening 924. - The substrate support pins906 preferably comprise distally tapered members constructed from quartz, aluminum oxide, silicon carbide, or other high temperature resistant materials. Each
substrate support pin 906 is disposed within atubular conduit 926, preferably made of a heat and oxidation resistant material, that extends through theheater plate 904. The substrate support pins 906 are connected to alift plate 928 for moving the substrate support pins 906 in a uniform manner. Thelift plate 928 is attached to an actuator 930 (such as a stepper motor) through alift shaft 932. Theactuator 930 moves thelift plate 928 to facilitate positioning of a substrate at various vertical positions within the RTA chamber. Thelift shaft 932 extends through thebase 908 of theenclosure 902 and is sealed by a sealingflange 934 disposed around the shaft. - To transfer a substrate into the
RTA chamber 211, theslit valve 922 is opened, and the loadingstation transfer robot 228 extends its robot blade having a substrate positioned thereon through theopening 924 into the RTA chamber. The robot blade of the loadingstation transfer robot 228 positions the substrate in the RTA chamber above theheater plate 904, and the substrate support pins 906 are extended upwards to lift the substrate above the robot blade. The robot blade then retracts out of the RTA chamber, and theslit valve 922 closes the opening. The substrate support pins 906 are then retracted to lower the substrate to a desired distance from theheater plate 904. Optionally, the substrate support pins 906 may retract fully to place the substrate in direct contact with the heater plate. - Preferably, a
gas inlet 936 is disposed through thesidewall 910 of theenclosure 902 to allow selected gas flow into theRTA chamber 211 during the anneal treatment process. Thegas inlet 936 is connected to agas source 938 through avalve 940 for controlling the flow of the gas into theRTA chamber 211. Agas outlet 942 is preferably disposed at a lower portion of thesidewall 910 of theenclosure 902 to exhaust the gases in the RTA chamber. The gas outlet is preferably connected to a relief/check valve 944 to prevent backstreaming of atmosphere from outside of the chamber. Optionally, thegas outlet 942 is connected to a vacuum pump (not shown) to exhaust the RTA chamber to a desired vacuum level during an anneal treatment. - A substrate is annealed in the
RTA chamber 211 after the substrate has been electroplated in the electroplating cell and cleaned in the SRD station. Preferably, theRTA chamber 211 is maintained at about atmospheric pressure, and the oxygen content inside theRTA chamber 211 is controlled to less than about 100 ppm during the anneal treatment process. Preferably, the ambient environment inside theRTA chamber 211 comprises nitrogen (N2) or a combination of nitrogen (N2) and less than about 4% hydrogen (H2). The ambient gas flow into theRTA chamber 211 is maintained at greater than 20 liters/min to control the oxygen content to less than 100 ppm. The electroplated substrate is preferably annealed at a temperature between about 200° C. and about 450° C. for between about 30 seconds and 30 minutes (and more preferably, between about 250° C. and about 400° C. for between about 1 minute and 5 minutes). RTA processing typically requires a temperature increase of at least 50° C. per second. To provide the required rate of temperature increase for the substrate during the anneal treatment, the heater plate is preferably maintained at between about 350° C. and 450° C. The substrate is preferably positioned at between about 0 mm and about 20 mm from the heater plate (i.e., contacting the heater plate) for the duration of the anneal treatment process. Preferably, acontroller 222 controls the operation of theRTA chamber 211, including maintaining the desired ambient environment in the RTA chamber and the temperature of the heater plate. - After the anneal treatment process is completed, the substrate support pins906 lift the substrate to a position for transfer out of the
RTA chamber 211. Theslit valve 922 opens, and the robot blade of the loadingstation transfer robot 228 is extended into the RTA chamber and positioned below the substrate. The substrate support pins 906 retract to lower the substrate onto the robot blade, and the robot blade then retracts out of the RTA chamber. The loadingstation transfer robot 228 then transfers the processed substrate into thecassette 232 for removal out of the electroplating processing system. (see FIGS. 2 and 3). - Referring back to FIG. 2, the
electroplating system platform 200 includes acontroller 222 that controls the functions of each component of the platform. Preferably, thecontroller 222 is mounted above themainframe 214, and the controller comprises a programmable microprocessor. The programmable microprocessor is typically programmed using a software designed specifically for controlling all components of theelectroplating system platform 200. Thecontroller 222 also provides electrical power to the components of the system and includes a control panel 223 that allows an operator to monitor and operate theelectroplating system platform 200. The control panel 223, as shown in FIG. 2, is a stand-alone module that is connected to thecontroller 222 through a cable and provides easy access to an operator. Generally, thecontroller 222 coordinates the operations of theloading station 210, theRTA chamber 211, theSRD station 212, themainframe 214 and theprocessing stations 218. Additionally, thecontroller 222 coordinates with the controller of the electrolytesolution replenishing system 220 to provide the electrolyte solution for the electroplating process. - The following is a description of a typical substrate electroplating process sequence through the
electroplating system platform 200 as shown in FIG. 2. A substrate cassette containing a plurality of substrates is loaded into the substratecassette receiving areas 224 in theloading station 210 of theelectroplating system platform 200. A loadingstation transfer robot 228 picks up a substrate from a substrate slot in the substrate cassette and places the substrate in thesubstrate orientor 230. Thesubstrate orientor 230 determines and orients the substrate to a desired orientation for processing through the system. The loadingstation transfer robot 228 then transfers the oriented substrate from thesubstrate orientor 230 and positions the substrate in one of the substrate slots in the substrate pass-throughcassette 238 in theSRD station 212. Themainframe transfer robot 242 picks up the substrate from the substrate pass-throughcassette 238 and positions the substrate for transfer by theflipper robot 248. Theflipper robot 248 rotates its robot blade below the substrate and picks up substrate from mainframe transfer robot blade. The vacuum suction gripper on the flipper robot blade secures the substrate on the flipper robot blade, and the flipper robot flips the substrate from a face up position to a face down position. Theflipper robot 248 rotates and positions the substrate face down in thesubstrate holder assembly 450. The substrate is positioned below thesubstrate holder 464 but above thecathode contact ring 466. Theflipper robot 248 then releases the substrate to position the substrate into thecathode contact ring 466. Thesubstrate holder 464 moves toward the substrate and the vacuum chuck secures the substrate on thesubstrate holder 464. The bladder assembly 470 on thesubstrate holder assembly 450 exerts pressure against the substrate backside to ensure electrical contact between the substrate plating surface and thecathode contact ring 466. - The
head assembly 452 is lowered to a processing position above theprocess kit 420. At this position the substrate is below the upper plane of theweir 478 and contacts the electrolyte solution contained in theprocess kit 420. The power supply is activated to supply electrical power (i.e., voltage and current) to the cathode and the anode to enable the electroplating process., The electrolyte solution is typically continually pumped into the process kit during the electroplating process. The electrical power supplied to the cathode and the anode and the flow of the electrolyte solution are controlled by thecontroller 222 to achieve the desired electroplating results. Preferably, the head assembly is rotated as the head assembly is lowered and also during the electroplating process. - After the electroplating process is completed, the
head assembly 410 raises the substrate holder assembly and removes the substrate from the electrolyte solution. Preferably, the head assembly is rotated for a period of time to enhance removal of residual electrolyte solution from the substrate holder assembly. The vacuum chuck and the bladder assembly of the substrate holder then release the substrate from the substrate holder. The substrate holder is raised to allow the flipper robot blade to pick up the processed substrate from the cathode contact ring. The flipper robot rotates the flipper robot blade above the backside of the processed substrate in the cathode contact ring and picks up the substrate using the vacuum suction gripper on the flipper robot blade. The flipper robot rotates the flipper robot blade with the substrate out of the substrate holder assembly, flips the substrate from a face-down position to a face-up position, and positions the substrate on the mainframe transfer robot blade. The mainframe transfer robot then transfers and positions the processed substrate above theSRD module 236. The SRD substrate support lifts the substrate, and the mainframe transfer robot blade retracts away from theSRD module 236. The substrate is cleaned in the SRD module using deionized water or a combination of deionized water and a cleaning fluid as described in detail above. The substrate is then positioned for transfer out of the SRD module. The loadingstation transfer robot 228 picks up the substrate from theSRD module 236 and transfers the processed substrate into theRTA chamber 211 for an anneal treatment process to enhance the properties of the deposited materials. The annealed substrate is then transferred out of theRTA chamber 211 by theloading station robot 228 and placed back into the substrate cassette for removal from the electroplating system. The above-described sequence can be carried out for a plurality of substrates substantially simultaneously in theelectroplating system platform 200. Also, the electroplating system can be adapted to provide multi-stack substrate processing. - 2. Modular Metal Deposition Cell Configuration and Operation
- One embodiment of a modular
metal deposition cell 2700 is shown in FIG. 27. The modularmetal deposition cell 2700 represents one embodiment of theprocess cell 240 shown in FIG. 3. The modularmetal deposition cell 2700 comprises acell base 2702, acell top 2704, ananode 2706, adiffuser 2720, and ande-connectable fastener portion 2712. The cell base may include the encapsulatedanode 2000 shown in the embodiments of FIGS. 20-23. The modularmetal deposition cell 2700 is configured to be mounted to amodular cell frame 2800 formed in asupport member 2802. One embodiment of themodular cell frame 2800 is shown in FIG. 28. Themodular cell frame 2800 includes arecess perimeter 2804 and one ormore support flanges 2806 attached to thesupport member 2802 at therecess perimeter 2804. One ormore bolt recesses 2808 are formed in thesupport flanges 2806. - The
de-connectable fastener portion 2712 comprises anupper flange 2714 and alower flange 2716. Thecell top 2704 includes theupper flange 2714. Thecell base 2702 includes thelower flange 2716. During assembly, theupper flange 2714 is positioned above, and in contact with, thesupport flange 2806. Thelower flange 2716 is positioned below, and in contact with, thesupport flanges 2806. One ormore fasteners 2718 connect theupper flange 2714 to thelower flange 2716 through the bolt recesses 2808 formed in thesupport flanges 2806 One sealing member, such as an elastomeric gasket extends around the periphery of the modularmetal deposition cell 2700 between thesupport flanges 2806 and each one of theflanges upper flange 2714 to thelower flange 2716 extend through the bolt recesses 2808 formed in thesupport flanges 2806. In this manner, thefasteners 2718 not only connect the cell top 2704 (including the upper flange 2714) to the cell base 2702 (including the lower flange 2716), but thefasteners 2718 secure both thecell top 2704 and thecell base 2702 to thesupport flanges 2806 of themodular cell frame 2800. Thede-connectable fastener portion 2712 sealably connects thecell top 2704 to thecell base 2702 to define theinterior recess 2708 within the modularmetal deposition cell 2700. - During operation, electrolyte solution is contained within the
interior recess 2708 in a manner so a substrate contained in thehead assembly metal deposition cell 2700 through anopening 2710 formed in the modularmetal deposition cell 2700. Thehead assembly 2410 shown in FIG. 25, can be mounted to themodular cell frame 2800 in a position that provides for insertion into, and retraction from, theopening 2710 formed in the modularmetal deposition cell 2700. - The
anode 2706 is supported within thecell base 2702 by electrical contacts andfeed throughs 2006 that extend through abottom portion 2722 of thecell base 2702. The electric contacts andfeed throughs 2006 provide electrical voltage/current to theanode 2706 under the control of thecontroller 222. The electrical contacts andfeed throughs 2006 support the anode in a raised position above thebottom portion 2722 so afirst fluid void 2724 is formed between theanode 2706 and the bottom portion. Theanode 2706 does not extend to the vertical periphery of theinterior recess 2708 so asecond fluid void 2726 is created between the side of theanode 2706 and thecell base 2702. Athird fluid void 2728 is formed between the upper surface of theanode 2706 and the lower surface of thediffuser 2720. Thefirst fluid void 2724, thesecond fluid void 2726, and thethird fluid void 2728 form a fluid continuum that are each in fluid communication with each other. Theelectrolyte solution inlet 510 is in fluid communication with thefirst fluid void 2724, so any electrolyte solution applied through theelectrolyte solution inlet 510 can pass through thefluid voids anode 2706 and the lower surface of thediffuser 2720. - The
diffuser 2720 extends within arecess mount 2732 formed in thecell base 2702. When thecell top 2704 and thecell base 2702 are connected at thede-connectable fastener portion 2712, thediffuser 2720 is secured between thecell top 2704 and thecell base 2702. Thediffuser 2710 is formed from a plastic, rubber, metal, or other material that can maintain its general shape within the modularmetal deposition cell 2700 under the electrolyte solution fluid pressures applied through theelectrolyte solution inlet 510. The diffuser contains generally vertically-orientedpores 2721 that enhance fluid flow of electrolyte solution in the vertical direction above the diffuser, and limit fluid flow of electrolyte solution in the horizontal direction above thediffuser 2720. The electrolyte solution is applied through the electrolyte solution inlet at a pressure above atmospheric pressure. The pressure of the electrolyte solution within thethird fluid void 2728 that is in fluid communication with the diffuser is also above atmospheric pressure. Therefore, electrolyte solution will be directed through the pores in thediffuser 2720 from below the diffuser to above the diffuser in a direction that is substantially parallel to the orientation of the pores formed in the diffuser. Thediffuser 2720 therefore enhances the uniformity of the electrolyte solution fluid flow in the vertical direction across the width of the modular metal deposition cell. - During operation, the modular
metal deposition cell 2700 applies a metal film to the seed layer on a substrate. Thehead assembly 2410 shown in the embodiment of FIG. 25 moves the substrate through theopening 2710 to a position within theinterior recess 2708. Subsequently, thehead assembly 2410 removes the substrate from within the modularmetal deposition cell 2728 for further transport and processing. - To repair or replace the modular metal deposition cell, the electrolyte solution is initially drained from within the
interior recess 2708. The draining of the electrolyte solution is typically performed through a drain in a fluid connector coupled to the electrolyte solution inlet 510 (or through the electrolyte solution inlet itself). Any electric connection to the electrical contacts or feedthroughs 2006 is disconnected. The de-connectable fastener portion is then disconnected by removing thefasteners 2718. After thefasteners 2718 are removed, thecell base 2702 is lowered from below, and thecell top 2704 is raised above, themodular recess frame 2800. If it is necessary to replace one or more components in only either thecell top 2704 or thecell base 2702, then the fastener can be removed and only that portion needs to be replaced. For example, if only theanode 2706 in thecell base 2702 needs to be replaced, then thefasteners 2718 are removed, the cell base to be replaced 2702 is removed, thereplacement cell base 2702 is inserted into the position, and thefasteners 2718 are re-inserted. During this procedure, thecell top 2704 remains in the position. After the modularmetal deposition cell 2700 is reinstalled, and operating, any repair work on the replacedcell base 2702 orcell top 2704 can be performed. - Following the removal of any part of the modular
metal deposition cell 2700 from themodular cell frame 2800, a new modular metal deposition cell replacement part is installed. Any repair that is to be done on the removed modularmetal deposition cell 2700 can be performed after the new modularmetal deposition cell 2700 is installed. This rapid replacement of the modular metal deposition cells limits down-time of theelectroplating system platform 200 to the time necessary to replace the cell top or cell bottom in the modular metal deposition cell, and does not include time necessary to repair the specific part of the modular metal deposition cell. - It is envisioned that those operating
electroplating system platforms 200 will keep a sufficient supply ofcell bases 2702 and cell tops 2704 on hand to replace those cells that have become worn or degraded. Since the greatest wear portion of the modularmetal deposition cell 2700 is almost certainly theanode 2706, it is envisioned that thecell base 2702 may have to repaired much more frequently than thecell top 2704. Another frequent wear item is thediffuser 2720. - To repair or replace the
anode 2706 from a replaced cell base, thediffuser 2720 is initially lifted from thecell base 2702. The electrical contacts andfeed throughs 2006 contain a threaded connection joint 2736 that may be unscrewed to provide for separation of theanode 2706 from thecell base 2702, and the removedanode 2706 is then removed from within thecell base 2702. The replacement anode is then inserted into thecell base 2702, and the electrical contacts and feedthroughs 2006 are connected to thereplacement anode 2706. - To re-install the modular
metal deposition cell 2700 into themodular cell frame 2800, thediffuser 2720 is initially inserted in thecell base 2702. Thecell top 2704 is positioned above themodular cell frame 2800 so thefasteners 2718 that extend through theupper flange 2714 align with the bolt recesses 2808 formed in thesupport flanges 2806. At this time, thecell top 2704 is supported by themodular cell frame 2800. Thecell base 2702 is then positioned below themodular cell frame 2800 and thefasteners 2718 are aligned with the threaded fastener recesses (or nuts) in thelower flange 2716. Thefasteners 2718 are then tightened to form a sealing connection between thecell top 2704 and thecell base 2702. A gasket may be inserted to enhance the seal between the cell top and the cell base. The fluid connections are then re-connected or re-sealed to theelectrolyte solution inlet 510. The electrical connections are re-established to the electrical contacts and feedthroughs 2006. Electrolyte solution is input to fill theinterior recess 2708 of the interior of the modular metal deposition cell. The modularmetal deposition cell 2700 is then ready for operation when thehead assembly 2410 lowers the substrate into the electrolyte solution in the modularmetal deposition cell 2700. - The modular metal deposition cell is configured to provide for rapid replacement of the high wear items such as the
anode 2706 to limit down-time in the modularmetal deposition cell 2700. The high wear items can be repaired or replaced within the removed cell top or cell base following removal from the modular metal deposition cell, and the cell top or cell base with the replacement part can be re-used. Replacement cell tops and/or cell bottoms of modularmetal deposition cells 2700 can be kept on supply, and old or worn modular metal deposition cells can be repaired or replaced without excessive down-time of theelectroplating system platform 200. Limiting the down-time of the electroplating system associated with repair or replacement of modularmetal deposition cells 2700 increases the usage time of the overall system. - While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof.
Claims (26)
1. An electrochemical plating cell, comprising:
a lower cell body defining a first fluid containing volume, the first fluid containing volume having a base and upstanding wall that defines an opening;
an upper cell body removably secured to the lower cell body over the opening and defining a second fluid containing volume; and
an anode positioned in the first fluid containing volume.
2. The electrochemical plating cell of claim 1 , wherein the first fluid containing volume is in fluid communication with the second fluid containing volume.
3. The electrochemical plating cell of claim 2 , wherein the first fluid containing volume is separated from the second fluid containing volume by a diffusion member.
4. The electrochemical plating cell of claim 3 , wherein the diffusion member is a fluid permeable porous disk.
5. The electrochemical plating cell of claim 4 , wherein the porous disk comprises a porous ceramic material.
6. The electrochemical plating cell of claim 1 , wherein an upper portion of the upstanding wall comprises an annular recess forming an overflow weir.
7. The electrochemical plating cell of claim 6 , comprising a disk shaped diffusion member sized to be received in the annular recess.
8. The electrochemical plating cell of claim 1 , wherein an upper portion of the upstanding wall defines an opening sized to receive substrates therein for processing.
9. The electrochemical plating cell of claim 8 , wherein the upper portion of the upstanding wall comprises an overflow weir.
10. The electrochemical plating cell of claim 1 , further comprising a removable fastener that connects the cell base to the cell top.
11. A modular plating cell, comprising:
a lower cell body comprising a base member having an annular upstanding wall extending therefrom;
an upper cell body comprising a wall detachably secured at a lower portion thereof to an upper surface of the annular upstanding wall, the upper and lower cell bodies cooperatively defining a fluid volume; and
a diffusion member positioned across the fluid volume.
12. The modular plating cell of claim 11 , comprising an anode positioned in the lower cell body.
13. The modular plating cell of claim 11 , wherein the upper cell body comprises an annular weir positioned on a top portion of the upstanding wall.
14. The modular plating cell of claim 11 , wherein the lower cell body comprises a first annular flange positioned on the upper surface of the annular upstanding wall and the upper cell body comprises a second annular flange positioned on a lower portion of the wall, the first annular flange being configured to engage the second annular flange to secure the upper cell body to the lower cell body.
15. The modular plating cell of claim 12 , wherein the first and second annular flanges cooperatively form a detachable fastener.
16. The modular plating cell of claim 15 , wherein the detachable fastener comprises a bolted joint.
17. An electrochemical plating cell, comprising:
first cell means for confining electrolyte;
second cell means for confining electrolyte and receiving a substrate therein;
diffusing means disposed at least partially between the first and second cell means to selectively provide fluid communication between the first and second cell means; and
substrate support means for positioning a substrate in the second cell means.
18. The electrochemical plating cell of claim 17 , wherein the first cell means comprises a lower cell body defining a first fluid containing volume and the second cell means comprises an upper cell body defining a second fluid containing volume.
19. The electrochemical plating cell of claim 18 , wherein the first cell means is detachably connected to the second cell means.
20. The electrochemical plating cell of claim 19 , further comprising an anode disposed in the first cell means.
21. The electrochemical plating cell of claim 20 , wherein the diffusing means comprises a fluid permeable porous plate.
22. The electrochemical plating cell of claim 21 , wherein the diffusing means comprises a ceramic plate.
23. The electrochemical plating cell of claim 17 , further comprising an anode disposed in the first cell means.
24. The electrochemical plating cell of claim 23 , wherein the diffusing means is a permeable porous plate.
25. The electrochemical plating cell of claim 24 , wherein the diffusing means is comprised of ceramic.
26. The electrochemical plating cell of claim 24 , wherein the first cell means comprises a lower cell body defining a first fluid containing volume and the second cell means comprises an upper cell body defining a second fluid containing volume and the diffusing means is disposed between the lower cell body and the upper cell body and the upper body defines an opening an upper end thereof.
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US10/429,684 US20030205461A1 (en) | 2000-09-15 | 2003-05-05 | Removable modular cell for electro-chemical plating |
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US09/663,814 US6557237B1 (en) | 1999-04-08 | 2000-09-15 | Removable modular cell for electro-chemical plating and method |
US10/429,684 US20030205461A1 (en) | 2000-09-15 | 2003-05-05 | Removable modular cell for electro-chemical plating |
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US10/429,684 Abandoned US20030205461A1 (en) | 2000-09-15 | 2003-05-05 | Removable modular cell for electro-chemical plating |
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Also Published As
Publication number | Publication date |
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TWI227749B (en) | 2005-02-11 |
US6557237B1 (en) | 2003-05-06 |
WO2002022915A2 (en) | 2002-03-21 |
WO2002022915A3 (en) | 2004-12-29 |
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