USRE37104E1 - Planarization of a gate electrode for improved gate patterning over non-planar active area isolation - Google Patents
Planarization of a gate electrode for improved gate patterning over non-planar active area isolation Download PDFInfo
- Publication number
- USRE37104E1 USRE37104E1 US08/710,287 US71028796A USRE37104E US RE37104 E1 USRE37104 E1 US RE37104E1 US 71028796 A US71028796 A US 71028796A US RE37104 E USRE37104 E US RE37104E
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- layer
- forming
- conductive material
- planarized
- partially reflective
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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
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28123—Lithography-related aspects, e.g. sub-lithography lengths; Isolation-related aspects, e.g. to solve problems arising at the crossing with the side of the device isolation; Planarisation aspects
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/7684—Smoothing; Planarisation
Definitions
- This invention relates to a semiconductor fabrication process and more particularly to a process for gate patterning over an active area isolation.
- a conventional process starts with a wafer substrate 10 , as depicted in FIG. 1, that has patterned thin oxide layers 12 separating isolation regions of thick (or field) oxide 11 .
- a wafer substrate 10 as depicted in FIG. 1, that has patterned thin oxide layers 12 separating isolation regions of thick (or field) oxide 11 .
- light can reflect off of the uneven topology topography of silicide 14 and cause what is know as reflective notching.
- the reflective notching in the photoresist pattern is then transferred into the underlying conductive layer following a subsequent etch.
- a conductive strip 21 shows the results of reflective notching during the exposure of the photoresist that has caused some of the conductive strip to be removed during the etching of the strip.
- the conductive strip 21 has been patterned over active area 22 to serve as a control gate to an MOS device. It becomes obvious that this reflective notch is undesirable as it would reduce the reliability of the MOS device.
- the present invention addresses the reflective notching problem by forming a planarized conductor on a wafer's surface that has a an uneven topology topography that results from the formation of spaced apart spaced- apart , patterned oxide isolation regions including oxide regions formed by LOCOS trench isolation and other advanced isolation technologies.
- the present invention is realized in a process for providing a planarized conductor on a non-planar starting substrate, by:
- FIG. 1 is a composite cross-sectional view of an in-process wafer portion depicting a conventional method used to pattern a gate electrode between field oxide isolation regions;
- FIG. 2 is an overhead view of the results of the process steps of FIG. 1 wherein reflective notching is demonstrated;
- FIG. 3 is a composite cross-sectional view of an in-process wafer portion depicting a silicide layer overlying a planarized polysilicon which in turn overlies a starting substrate;
- FIG. 4A is a composite cross-sectional view of the in-process wafer portion of FIG. 3 depicting the results of an etch
- FIG. 4B is a composite cross-sectional view of an in-process wafer portion depicting a planarized conductive control gates gate made of a single planarized polysilicon layer overlying a starting substrate;
- FIG. 4C is a composite cross sectional cross- sectional view of an in-process wafer portion depicting a planarized conductive control gate made of planarized polysilicon, silicide and partially reflective insulator layers overlaying a staringstarting substrate;
- FIG. 5 is a composite cross-sectional view of the in-process wafer portion utilizing the process steps of the present invention in a second embodiment
- FIG. 6 is a flow diagram depicting the process steps of the present invention.
- a silicon substrate 31 has patterned thick oxide isolation regions 32 (formed by a LOCOS isolation), spaced apart by a thin oxide film 33 (i.e. grown gate oxide).
- a thick layer of conductively doped polysilicon 34 e.g., a conductive material
- thick oxide region extends regions 32 extend approximately 2000 ⁇ 2000 ANG above the substrate's surface. Therefore, polysilicon 34 must be thick enough whereby its thickness extends substantially above the 2000 ⁇ 2000 ANG height of the thick oxide regions 32 .
- the overall thickness of the polysilicon 34 (e.g., a conductive material layer ) after planarization is about 3000 ⁇ .
- a layer of reflective material 35 such as silicide (i.e. tungsten silicide, titanium silicide, etc.) or metal is formed over planarized polysilicon 34 .
- silicide i.e. tungsten silicide, titanium silicide, etc.
- metal is formed over planarized polysilicon 34 .
- the planarization of the conductively doped polysilicon 34 (e.g., a conductive material ) can be achieved by abrasion, such as chemical mechanical polishing.
- planarized polysilicon 34 and silicide 35 are patterned to form planarized conductive strips 41 that will serve as (planarized) control gates to a MOS transistor.
- FIG. 4 b show 4 A
- FIG. 4B shows planarized conductive strips 42 that is are formed out of polysilicon only.
- FIG. 4 c show 4 A
- FIG. 4C shows planarized conductive strips 43 that are formed out of polysilicon 34 , silicide 35 and a partially reflective insulator 37 (such as nitride).
- FIG. 5 shows a second embodiment depicting the use of the process steps of the present invention wherein a thick oxide is patterned and etched to form thick blocks of isolation oxide 52 that is are spaced apart by a thin gate oxide 51 that results from the etching of thick oxide 52 .
- gate oxide 51 the thick oxide is etched to bare silicon and then a thin gate oxide is thermally grown on silicon 31 .
- FIG. 6 is a flow diagram depicting the general process steps of the present invention described above wherein; Step A : Step 1 comprises forming a planarized conductive layer over ana non-planar substrate; Alternate Step BStep 1 . 1 comprises forming a second conductive layer on the planarized conductive layer of Step AStep 1 ; and Step CStep 3 comprises patternedpatterning the conductive layers of Steps A and CSteps 1 and 3 to form a planarized conductor.
- planarized conductive strips on an a non-planarized surface wherein the conductive strips comprise various conductive materials including multiple doped polysilicon layers, metal layers and any combination thereof.
Abstract
Description
Claims (61)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/710,287 USRE37104E1 (en) | 1993-08-12 | 1996-09-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/105,276 US5346587A (en) | 1993-08-12 | 1993-08-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
US08/710,287 USRE37104E1 (en) | 1993-08-12 | 1996-09-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/105,276 Reissue US5346587A (en) | 1993-08-12 | 1993-08-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
Publications (1)
Publication Number | Publication Date |
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USRE37104E1 true USRE37104E1 (en) | 2001-03-20 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US08/105,276 Expired - Lifetime US5346587A (en) | 1993-08-12 | 1993-08-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
US08/710,287 Expired - Lifetime USRE37104E1 (en) | 1993-08-12 | 1996-09-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
Family Applications Before (1)
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US08/105,276 Expired - Lifetime US5346587A (en) | 1993-08-12 | 1993-08-12 | Planarization of a gate electrode for improved gate patterning over non-planar active area isolation |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7153781B2 (en) | 2000-06-19 | 2006-12-26 | Infineon Technologies Ag | Method to etch poly Si gate stacks with raised STI structure |
US20100270625A1 (en) * | 2009-04-22 | 2010-10-28 | Polar Semiconductor, Inc. | Method of fabricating high-voltage metal oxide semiconductor transistor devices |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06349826A (en) * | 1993-04-13 | 1994-12-22 | Toshiba Corp | Semiconductor device and its manufacture |
TW304301B (en) * | 1994-12-01 | 1997-05-01 | At & T Corp | |
FR2728102A1 (en) * | 1994-12-08 | 1996-06-14 | Sgs Thomson Microelectronics | Mfr. of MOS transistors on semiconductor wafer |
US5576579A (en) * | 1995-01-12 | 1996-11-19 | International Business Machines Corporation | Tasin oxygen diffusion barrier in multilayer structures |
WO1996027206A2 (en) * | 1995-02-24 | 1996-09-06 | Intel Corporation | Polysilicon polish for patterning improvement |
JPH08293543A (en) * | 1995-04-25 | 1996-11-05 | Mitsubishi Electric Corp | Semiconductor device and manufacture thereof |
US5606202A (en) * | 1995-04-25 | 1997-02-25 | International Business Machines, Corporation | Planarized gate conductor on substrates with above-surface isolation |
US5682055A (en) * | 1995-06-07 | 1997-10-28 | Sgs-Thomson Microelectronics, Inc. | Method of forming planarized structures in an integrated circuit |
JP2790084B2 (en) * | 1995-08-16 | 1998-08-27 | 日本電気株式会社 | Method for manufacturing semiconductor device |
US5945348A (en) * | 1996-04-04 | 1999-08-31 | Micron Technology, Inc. | Method for reducing the heights of interconnects on a projecting region with a smaller reduction in the heights of other interconnects |
US5854128A (en) * | 1996-04-29 | 1998-12-29 | Micron Technology, Inc. | Method for reducing capacitive coupling between conductive lines |
JP3008858B2 (en) * | 1996-09-06 | 2000-02-14 | 日本電気株式会社 | Method for manufacturing semiconductor device |
US6322634B1 (en) | 1997-01-27 | 2001-11-27 | Micron Technology, Inc. | Shallow trench isolation structure without corner exposure |
JP2001338979A (en) * | 2000-05-30 | 2001-12-07 | Mitsubishi Electric Corp | Semiconductor device and its manufacturing method |
JP2002057330A (en) * | 2000-08-10 | 2002-02-22 | Sanyo Electric Co Ltd | Insulated gate semiconductor device and its manufacturing method |
US6753266B1 (en) * | 2001-04-30 | 2004-06-22 | Advanced Micro Devices, Inc. | Method of enhancing gate patterning properties with reflective hard mask |
US6541360B1 (en) | 2001-04-30 | 2003-04-01 | Advanced Micro Devices, Inc. | Bi-layer trim etch process to form integrated circuit gate structures |
US6534418B1 (en) | 2001-04-30 | 2003-03-18 | Advanced Micro Devices, Inc. | Use of silicon containing imaging layer to define sub-resolution gate structures |
US8211786B2 (en) * | 2008-02-28 | 2012-07-03 | International Business Machines Corporation | CMOS structure including non-planar hybrid orientation substrate with planar gate electrodes and method for fabrication |
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US4829024A (en) * | 1988-09-02 | 1989-05-09 | Motorola, Inc. | Method of forming layered polysilicon filled contact by doping sensitive endpoint etching |
US4966868A (en) * | 1988-05-16 | 1990-10-30 | Intel Corporation | Process for selective contact hole filling including a silicide plug |
US5030584A (en) * | 1988-10-06 | 1991-07-09 | Nec Corporation | Method for fabricating MOS semiconductor device operable in a high voltage range using polysilicon outdiffusion |
US5037772A (en) * | 1989-12-13 | 1991-08-06 | Texas Instruments Incorporated | Method for forming a polysilicon to polysilicon capacitor |
US5063175A (en) * | 1986-09-30 | 1991-11-05 | North American Philips Corp., Signetics Division | Method for manufacturing a planar electrical interconnection utilizing isotropic deposition of conductive material |
US5069002A (en) | 1991-04-17 | 1991-12-03 | Micron Technology, Inc. | Apparatus for endpoint detection during mechanical planarization of semiconductor wafers |
US5122473A (en) * | 1989-10-24 | 1992-06-16 | Sgs-Thomson Microelectronics S.R.L. | Process for forming a field isolation structure and gate structures in integrated misfet devices |
US5126289A (en) * | 1990-07-20 | 1992-06-30 | At&T Bell Laboratories | Semiconductor lithography methods using an arc of organic material |
US5200030A (en) * | 1990-10-25 | 1993-04-06 | Hyundai Electronics Industries Co., Ltd. | Method for manufacturing a planarized metal layer for semiconductor device |
US5264076A (en) * | 1992-12-17 | 1993-11-23 | At&T Bell Laboratories | Integrated circuit process using a "hard mask" |
US5302551A (en) * | 1992-05-11 | 1994-04-12 | National Semiconductor Corporation | Method for planarizing the surface of an integrated circuit over a metal interconnect layer |
-
1993
- 1993-08-12 US US08/105,276 patent/US5346587A/en not_active Expired - Lifetime
-
1996
- 1996-09-12 US US08/710,287 patent/USRE37104E1/en not_active Expired - Lifetime
Patent Citations (11)
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US5063175A (en) * | 1986-09-30 | 1991-11-05 | North American Philips Corp., Signetics Division | Method for manufacturing a planar electrical interconnection utilizing isotropic deposition of conductive material |
US4966868A (en) * | 1988-05-16 | 1990-10-30 | Intel Corporation | Process for selective contact hole filling including a silicide plug |
US4829024A (en) * | 1988-09-02 | 1989-05-09 | Motorola, Inc. | Method of forming layered polysilicon filled contact by doping sensitive endpoint etching |
US5030584A (en) * | 1988-10-06 | 1991-07-09 | Nec Corporation | Method for fabricating MOS semiconductor device operable in a high voltage range using polysilicon outdiffusion |
US5122473A (en) * | 1989-10-24 | 1992-06-16 | Sgs-Thomson Microelectronics S.R.L. | Process for forming a field isolation structure and gate structures in integrated misfet devices |
US5037772A (en) * | 1989-12-13 | 1991-08-06 | Texas Instruments Incorporated | Method for forming a polysilicon to polysilicon capacitor |
US5126289A (en) * | 1990-07-20 | 1992-06-30 | At&T Bell Laboratories | Semiconductor lithography methods using an arc of organic material |
US5200030A (en) * | 1990-10-25 | 1993-04-06 | Hyundai Electronics Industries Co., Ltd. | Method for manufacturing a planarized metal layer for semiconductor device |
US5069002A (en) | 1991-04-17 | 1991-12-03 | Micron Technology, Inc. | Apparatus for endpoint detection during mechanical planarization of semiconductor wafers |
US5302551A (en) * | 1992-05-11 | 1994-04-12 | National Semiconductor Corporation | Method for planarizing the surface of an integrated circuit over a metal interconnect layer |
US5264076A (en) * | 1992-12-17 | 1993-11-23 | At&T Bell Laboratories | Integrated circuit process using a "hard mask" |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7153781B2 (en) | 2000-06-19 | 2006-12-26 | Infineon Technologies Ag | Method to etch poly Si gate stacks with raised STI structure |
US20100270625A1 (en) * | 2009-04-22 | 2010-10-28 | Polar Semiconductor, Inc. | Method of fabricating high-voltage metal oxide semiconductor transistor devices |
US7915129B2 (en) | 2009-04-22 | 2011-03-29 | Polar Semiconductor, Inc. | Method of fabricating high-voltage metal oxide semiconductor transistor devices |
Also Published As
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US5346587A (en) | 1994-09-13 |
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