EP1472017A1 - Procede de nettoyage d'un article - Google Patents

Procede de nettoyage d'un article

Info

Publication number
EP1472017A1
EP1472017A1 EP03729378A EP03729378A EP1472017A1 EP 1472017 A1 EP1472017 A1 EP 1472017A1 EP 03729378 A EP03729378 A EP 03729378A EP 03729378 A EP03729378 A EP 03729378A EP 1472017 A1 EP1472017 A1 EP 1472017A1
Authority
EP
European Patent Office
Prior art keywords
fluid
carbon dioxide
pressure
article
solvent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03729378A
Other languages
German (de)
English (en)
Other versions
EP1472017A4 (fr
Inventor
John Fredric Billingham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Praxair Technology Inc
Original Assignee
Praxair Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Praxair Technology Inc filed Critical Praxair Technology Inc
Publication of EP1472017A1 publication Critical patent/EP1472017A1/fr
Publication of EP1472017A4 publication Critical patent/EP1472017A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
    • H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/06—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0021—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by liquid gases or supercritical fluids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/08—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/28—Organic compounds containing halogen
    • C11D7/30—Halogenated hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/50—Solvents
    • C11D2111/22—

Definitions

  • supercritical carbon dioxide often results in reduced water consumption, reduced waste streams, reduced emissions, and/or enhanced solubility characteristics.
  • supercritical carbon dioxide has been utilized for many applications, such as photo-resist developing, photo-resist stripping, wafer cleaning, and wafer drying.
  • supercritical fluids are fluids which are above their critical pressure and temperature, and have both gas- and liquid-like properties.
  • Solvent properties of a supercritical fluid such as supercritical carbon dioxide, depend on the fluid density, which in turn dependents on the pressure/temperature conditions of the fluid.
  • the solvating properties of carbon dioxide decrease as the pressure of the fluid is reduced from supercritical to a lower pressure, for instance to atmospheric pressure, as occurs during depressurizing a chamber employed in a cleaning operation.
  • the invention is generally related to a method for cleaning an article by contacting an article with a solvent fluid that includes carbon dioxide, thereby removing impurities from the article, and displacing the solvent fluid with a displacing fluid.
  • the displacing fluid is other than carbon dioxide.
  • the article is a wafer and displacing is conducted at a temperature and pressure sufficient to prevent forming a second phase in the solvent fluid.
  • displacing is conducted at a temperature and pressure sufficient to prevent forming a second phase in the solvent fluid being displaced and carbon dioxide is recycled to the fluid.
  • the invention is directed to a method for reducing deposition of non- volatile residues during a workpiece cleaning operation.
  • the method includes the steps of contacting the workpiece with a solvent fluid at a first pressure, the solvent fluid including carbon dioxide, whereby contaminants on the workpiece are removed by the solvent fluid; reducing the pressure of the solvent fluid, whereby non-volatile residues become insoluble in the solvent fluid; and displacing the solvent fluid at the reduced pressure with a displacing gas that is other than carbon dioxide, whereby the time that the workpiece is exposed to insoluble non- volatile residues is reduced, thereby reducing deposition of insoluble nonvolatile residues on the workpiece.
  • the invention is directed to a method for supplying cleaning fluids to a vessel.
  • the method includes the steps of supplying a solvent fluid stream at a first pressure to a vessel housing a article, wherein the solvent fluid includes carbon dioxide and is capable of dissolving contaminants on an article in the vessel; supplying a displacing fluid stream to the vessel, wherein the displacing fluid stream has a pressure sufficient to displace the solvent fluid from the vessel and the displacing fluid is other than carbon dioxide; and exhausting the solvent fluid from the vessel.
  • the invention has numerous advantages. For example, practicing the method of the invention results in preparing ultra-clean surfaces, as required in semiconductor manufacturing and other industries. The method of the invention is economical and can be easily integrated into existing manufacturing facilities.
  • the method of the invention employs nitrogen displacing gas, as nitrogen lines generally are available at the facility.
  • low pressure e.g. 80-100 psig
  • available nitrogen can be employed.
  • spent carbon dioxide is recycled thereby reducing carbon dioxide consumption and associated costs.
  • recycling can be conducted without requiring compression of the spent fluid.
  • the invention takes into account non-volatile residue impurities that can be present in even high purity grades of carbon dioxide and addresses problems caused by their precipitation upon chamber depressurization.
  • Figs 1A-1C illustrate the stages in the formation of a second phase as pressure is reduced in a chamber housing an article that is contacted with carbon dioxide solvent.
  • Figs.2A-2D illustrate method steps in an example of one embodiments of the invention.
  • Figs 3A-3E illustrate method steps in an example of another embodiment of the invention.
  • the invention generally is related to producing clean surfaces, such as, required, for example, during semiconductor manufacturing or processing.
  • the invention is related to removing, preventing or minimizing deposition of contaminants on wafers, such as wafers that include one or more electromechanical devices, one or more integrated circuits or combinations thereof, as known in the art.
  • optical parts for example, optical lenses, filters, frequency doubling devices, lasing crystals, light splitting elements, optical cavities, fiber optics, mirrors, and others.
  • Articles such as television, füro-recording and photograhic camera components, components used in scientific and medical instruments, in satellite communication, in the aerospace industry and other workpieces also can be processed as described herein.
  • the article can be fabricated from of any material, including inorganic matter, such as silicon, silicon dioxide, graphite, or metal; organic matter, such as polymers; or a material made from a combination of inorganic and organic materials.
  • This method for cleaning can be applied to a single article, or it can be used to clean two or more articles at a time.
  • the invention relates to a method for removing contaminants or impurities from an article or from the environment surrounding the article, such as found in a chamber housing the article during its manufacture or processing.
  • the method can itself be a step in a larger manufacturing operation, such as a process for depositing or growing a film, a photolithographic process, an etching process, an ion implantation process, a chemical mechanical planarization process, a diffusion process, a photo-resist development process, a process for developing photosensitive materials, a process for cleaning optical parts, a process for cleaning components useful in aerospace applications, a photo-resist stripping process, a wafer cleaning process, a wafer drying process, a degreasing process, or an extraction process.
  • Contaminants include organic and/or inorganic materials not desired on the final product. They can be solid, liquid or in gaseous form. Examples include polymers, greases, and other organic materials; silicon; carbon; and/or metals and other impurities. They can be present on the surface of the article or diffused throughout at least a portion of a material comprising of the article.
  • Impurities can be generated from the article itself, and can include portions of a wafer that are removed during wafer processing or debris produced during an etching process. Impurities also can be delivered to the article with a process fluid. Chemical compounds, such as employed in fabricating or processing an article, also can be left on the surface of the article or can be present in the process chamber once the operation is completed.
  • the invention is particularly suitable in removing non-volatile residues (NVRs).
  • NVRs non-volatile residues
  • non volatile residues include, but are not limited to heavy organics, such as, for example, hydrocarbons, (e.g., C )0+ ), heavy halocarbons and others.
  • heavy organics such as, for example, hydrocarbons, (e.g., C )0+ ), heavy halocarbons and others.
  • Sources of NVRs include compressor oils, paints, elastomeric materials that have some solubility in the solvent and are commonly found in gasket and valve seat materials, sealants used in the solvent feed lines and others. NVRs can be generated during a process operation on a workpiece, for instance during wafer cleaning.
  • NVRs also can be brought into contact with the surface of an article by a fluid employed in the manufacture, processing or in cleaning the article.
  • a fluid employed in the manufacture, processing or in cleaning the article for example, carbon dioxide is used during photo-resist developing; photo-resist stripping; wafer cleaning; and wafer drying.
  • Bulk liquid carbon dioxide is believed to contain NVRs in concentrations of up to 10 parts per million (ppm) by weight.
  • ppm parts per million
  • Some higher purity grades, available in cylinders, can contain approximately 0.15 ppm NVRs by weight. Even the higher purity grades can carry an unacceptable amount of NVRs for sensitive processes which require that the finished article contain less than a specific number of particles of a given size.
  • Some manufacturing processes require that gases have less than 100 particles above some critical size (typically on the order of 100 nanometers) per standard cubic meter. It is estimated that vaporization of one liter of the higher purity grades of liquid carbon dioxide (-10 ppb) can result in millions of NVR particles. In order to reach such cleanliness levels, the purity of the carbon dioxide would need to be increased at least a thousand fold over the highest purity carbon dioxide currently available.
  • Chamber 10 that houses wafer 12.
  • Chamber 10 is a vessel or container such as encountered, for instance, at a tool or process station in a semiconductor fabrication facility.
  • Chamber 10 is designed to receive and hold high pressure fluids such as supercritical carbon dioxide (i.e., carbon dioxide above its critical temperature and pressure, specifically, above 31°C and 1070 pounds per square inch absolute (psia)).
  • Chamber 10 is provided with port(s) for introducing process fluids and other chemicals and with evacuation port(s), as known in the art.
  • Means for introducing and for evacuating chamber 10 can be employed, as known in the art. Examples include compressors, pumps, vent valves and others.
  • chamber 10 is filled with carbon dioxide at a pressure of 2000 pounds per square inch gauge (psig). At this pressure, contaminants on the wafer are dissolved in the carbon dioxide solvent and the concentration of second phase (insoluble) NVRs is minimal. As chamber 10 is decompressed to a lower pressure, e.g., 200 psig, as shown in Fig. 2B, and then to ambient pressure, as shown in Fig. IC, the solvating properties of carbon dioxide towards the NVRs diminish and a second phase is formed. The second phase NVRs in chamber 10 can impact the wafer, thereby contaminating it.
  • psig pounds per square inch gauge
  • the method of the invention includes contacting an article, e.g., a wafer with a solvent fluid that includes carbon dioxide, whereby contaminants on the article dissolve in the solvent fluid.
  • a solvent fluid that includes carbon dioxide
  • the method of the invention can be employed with bulk carbon dioxide.
  • the solvent fluid includes at least 50 percent (%) by weight carbon dioxide.
  • the solvent fluid includes at least 75%, more preferably at least 90% and most preferably, at least 98% carbon dioxide by weight.
  • the solvent fluid can be 100% carbon dioxide.
  • the solvent fluid includes at least one addtional component such as, for instance, a co- solvent, surfactant or a chelating agent.
  • addtional component such as, for instance, a co- solvent, surfactant or a chelating agent.
  • examples of components that can be employed in addition to carbon dioxide, alone or in combination, include ammonia, halogenated hydrocarbons, hydrofluoric acid, sulfur dioxide and others.
  • cosolvents, surfactants, and/or chelating agents include silane; hydrocarbons, such as methane, ethane, propane, butane, pentane, hexane, ethylene, and propylene; halogenated hydrocarbons such as tetrafluoromethane, chlorodifluoromethane, sulfur hexafluoride, and perfluoropropane; inorganics such as ammonia, helium, krypton, argon, and nitrous oxide; alcohols, such as ethanol, methanol, or isopropyl alcohol; propylene carbonate; atmospheric gasses, such as nitrogen, hydrogen, ozone, or oxygen; water; amines, such as hydroxylamine and alkanolamines; acetone; pyrrolidones such as N-methylpyrrolidone, N- ethylpyrrolidone, N-hydroxyethylpyrrolidone and N-cyclohe
  • the solvent fluid includes carbon dioxide having a pressure that is at least 800 psig.
  • the solvent fluid includes carbon dioxide that is at or near its critical state or at supercritical conditions.
  • the carbon dioxide solvent may be directed to the container in either a vapor, liquid, or supercritical phase. Once inside the container, the carbon dioxide solvent contacts the article in order to remove the impurities.
  • the removal of the impurities can be accomplished through a physical or chemical mechanism, for example the carbon dioxide solvent may dissolve the impurities; the impurities may diffuse into the carbon dioxide solvent from the material making up the article; or the impurities may react with the carbon dioxide solvent in a way that results in their removal from the article.
  • the removal can also be a mechanical mechanism, for example the or the pressure and/or temperature of the carbon dioxide solvent can be manipulated so that its specific volume increases and/or decreases, resulting in stresses that break the impurities from the article.
  • the removal of the impurities can also be accomplished through a combination of chemical and mechanical mechanisms.
  • the carbon dioxide solvent can also be agitated in order to enhance both a chemical and mechanical mechanism.
  • agitation can increase the speed of chemical removal mechanisms (such as dissolution, diffusion, and reaction) by increasing concentration gradients across the surface of the article, thereby driving the chemical mechanism towards completion.
  • agitation can increase the rate of removal for mechanical removal mechanisms because the agitation creates shear forces in the fluid which can assist in pulling the impurities away from the surface of the article.
  • the temperature and/or pressure of the carbon dioxide solvent can be manipulated to also facilitate the removal of the impurities. These manipulations of process conditions can result in the carbon dioxide solvent undergoing one or more phase shifts between the vapor, liquid, and/or supercritical phases depending on whether the chosen manipulations cross the carbon dioxide solvent's critical temperature and/or pressure and it's condensation pressure and/or temperature. These manipulations are preferably done to enhance the removal of the impurities. If there are several different types of impurities on or in the article, the carbon dioxide solvent can be cycled through various process conditions to enhance the removal of each type of impurity. While the carbon dioxide solvent is undergoing these manipulations, NVRs or removed impurities may dissolve into and/or precipitate out of the solvent fluid.
  • At least a portion of solvent fluid including contaminants can be replaced with fresh solvent fluid or pure carbon dioxide in an intermediate rinsing step, whereby spent solvent fluid is pushed through and additional contaminants can be removed from the surface being cleaned.
  • the method includes displacing the solvent fluid with a displacing fluid, that is other than carbon dioxide, at a temperature and pressure sufficient to prevent forming a second phase in the solvent fluid being displaced, whereby the contaminants are separated from the wafer, thereby cleaning the wafer.
  • the solvent fluid is displaced at its pressure in the chamber, without partial or total chamber decompression. If decompression of the chamber is employed, it is to a pressure at which solubility of NVRs in the solvent fluid is maintained.
  • the displacing fluid can be a gas, a liquid or a supercritical fluid. Suitable displacing fluids include inert gases such as nitrogen, helium, argon or krypton, other gases, such as oxygen, and any combinations thereof. Nitrogen is preferred. In one embodiment of the invention, the displacing fluid is a high purity gas. In another embodiment, the displacing fluid is an ultrahigh purity gas, for instance having purity levels of sub parts per billion in all contaminants or as known in the industry. High purity and ultra-high purity gases, such as nitrogen and others can be obtained commercially.
  • the method of the invention can be conducted continuously or in batch-wise manner.
  • FIG. 14 shows chamber 14, housing wafer 12.
  • Chamber 14 can be a chamber such as described above.
  • chamber 14 can be designed so that fresh fluid fed to the container mixes to a significant degree with the carbon dioxide solvent already present (for instance, in the fashion of a continuously-stirred tank reactor), or so that the flow path that enhances the displacement of used solvent, impurities, and NVRs (e.g., in a plug-flow fashion).
  • the chamber geometry is such that the exposure of the article to impurities and NVRs is minimized during the displacement of the carbon dioxide solvent, impurities, and NVRs.
  • Ports and means for feeding and evacuating fluids from chamber 14 can be provided as known in the art.
  • chamber 14 is filled with carbon dioxide at about 2000 psig that includes dissolved contaminants.
  • An inert gas at a pressure higher than that of the carbon dioxide in the chamber, e.g., higher than 2000 psig is directed to chamber 14, as shown in Fig 2B.
  • Carbon dioxide together with dissolved contaminants is displaced from chamber 14, as shown in Fig. 2C.
  • Chamber 14, including displacing gas is then depressurized to atmospheric pressure, as shown in Fig. 2D.
  • the final number of impurities left on the article after evacuation can be improved by using a higher purity displacing fluid and/or carbon dioxide solvent, or by increasing the volume of the displacing fluid used in order to more thoroughly displace the carbon dioxide solvent, impurities, and NVRs.
  • Carbon dioxide displaced from the chamber can be exhausted as a waste stream or can be directed to another operation or tool in the facility.
  • the fluid displaced from chamber 14 is purified, for example by directing fluid exhausted from the chamber to one or more purification units.
  • the pressure of fluid exhausted from chamber 14 is high, (e.g., 2000psig)
  • the spent fluid generally can be directed to a purification unit without further compression.
  • purification techniques that can be employed include distillation, adsorption, absorption, chemical reactions, phase separation and other methods.
  • the solvent fluid displaced can be purified with respect to NVRs, co- solvents, surfactants and chelating agents.
  • the resulting stream can be further purified to separate carbon dioxide from the displacing fluid, e.g., nitrogen.
  • a suitable method for separating carbon dioxide from nitrogen includes distillation.
  • carbon dioxide is recycled as described in U.S. Patent Application No 10/274,302, Recycle for Supercritical Carbon Dioxide, filed on October 17, 2002, the teachings of which are incorporated herein by reference in their entirety.
  • Displacing fluid also can be recycled. If helium is used as a displacing fluid, recycling is particularly attractive due to its cost and its significantly light weight to effect an easier removal process.
  • the invention is related to a method for reducing deposition of non- volatile residues during a workpiece cleaning operation.
  • the method includes contacting the workpiece with a solvent fluid, essentially as described above.
  • the method includes reducing the pressure of the solvent fluid, whereby contaminants, e.g., NVRs, become insoluble in the solvent fluid.
  • the method further includes displacing the solvent fluid, at the reduced pressure, with a displacing fluid, such as described above, whereby the time during which the workpiece is exposed to insoluble contaminants, e.g., NVRs, is reduced, thereby reducing deposition of insoluble contaminants, e.g., NVRs on the workpiece.
  • the pressure of the solvent fluid is reduced to less than about 1000 psig. In another embodiment, the pressure is reduced to less than 200 psig. In further embodiment, the pressure of the solvent fluid is reduced to a value that is lower than the pressure of a nitrogen gas source or line available at the facility, e.g., to less than about 80-100 psig.
  • the wafer is exposed to insoluble NVRs for less than about 30 seconds. More preferably, the wafer is exposed to insoluble NVRs for less than 3 seconds.
  • at least a portion of the solvent fluid, together with dissolved contaminants can be displaced using fresh solvent fluid or pure carbon dioxide in an intermediate rinsing step.
  • the rinsing step can be conducted before or after chamber depressurization.
  • Carbon dioxide and, optionally, displacing gas recycling can be employed, essentially as described above. Recycling can include a compression step prior to directing fluid that is to be recycled to a purifier. As discussed above, the method can be conducted continuously or in batch- wise fashion.
  • FIG. 3 A An example of the stages of this embodiment of the invention is shown in Figs 3 A - 3E. Shown in Fig 3 A is chamber 14 housing wafer 12, essentially as described above. Carbon dioxide at a pressure of about 2000 psig is present in chamber 14. Chamber 14 is depressurized to 200 psig, as shown in Fig. 3B. Upon the pressure reduction, NVRs precipitate out of solution, forming a second phase. An inert gas, e.g., nitrogen at a pressure sufficient to push through solvent fluid at 200 psig is directed into chamber 14, as shown in Fig. 3C, thereby displacing carbon dioxide and second phase impurities from chamber 14, as shwon in Fig. 3D.
  • inert gas e.g., nitrogen at a pressure sufficient to push through solvent fluid at 200 psig is directed into chamber 14, as shown in Fig. 3C, thereby displacing carbon dioxide and second phase impurities from chamber 14, as shwon in Fig. 3D.
  • the invention is related to a method for producing an ultraclean article.
  • the term "ultra-clean” refers to a substrate contaminated by less than about 2,000 particles per square meter of surface areas, the impurities having an effective diameter greater than about 0.1 micron and being measured by a light scattering technique. Light scattering methods for measuring particles having an effective diameter greater than about 0.1 micron on a solid surface are known in the art.
  • the method includes contacting the article, in a chamber, with carbon dioxide solvent, whereby impurities on the article dissolve in the carbon dioxide solvent and directing a displacing gas into the chamber to reduce the time that the article is exposed to non-volatile residues present in the carbon dioxide, thereby reducing the number of impurities on the article to less than about 2000 particles per square meter of surface area, wherein each of the impurities has an effective diameter greater than 0.1 microns as measured by a light scattering technique.
  • the invention is directed to a method for supplying cleaning fluids to a vessel.
  • the method includes the steps of supplying a solvent fluid stream at a first pressure to a vessel housing a article, wherein the solvent fluid includes carbon dioxide and is capable of dissolving contaminants on an article in the vessel; supplying a displacing fluid stream to the vessel, wherein the displacing fluid stream has a pressure sufficient to displace the solvent fluid from the vessel and the displacing fluid is other than carbon dioxide; and exhausting the solvent fluid from the vessel.
  • Exhaust fluid from the vessel can be purified, essentially as described above, and carbon dioxide can be recycled to the vessel. Purified carbon dioxide can be compressed prior to being returned to the vessel, by means known in the art.
  • the displacing fluid stream is at a pressure that is at least as high as the first pressure.
  • the displacing fluid is no more than about 100 psi greater than the pressure of the solvent fluid that it displaces.
  • the first pressure is at least 1000 psig.
  • the fluid exhausted from the vessel can be at a pressure higher than the operating pressure of the purification unit.
  • solvent fluid is exhausted from the vessel at a pressure that is lower than the first pressure and the displacing fluid is at a pressure sufficient to push through the solvent fluid.

Abstract

L'invention concerne un procédé de nettoyage d'un article, consistant à mettre l'article en contact avec un fluide solvant renfermant du dioxyde de carbone pour dissoudre les contaminants de l'article dans le solvant, puis à déplacer le fluide solvant avec un fluide de déplacement autre que le dioxyde de carbone. Dans un aspect de l'invention, le fluide de déplacement est à une température et à une pression suffisantes pour éviter la formation d'une seconde phase dans le fluide solvant déplacé, au moins une partie du dioxyde de carbone étant recyclée vers l'article. Dans un autre aspect de l'invention, le procédé consiste à réduire la pression du fluide solvant avant qu'il ne soit déplacé à l'aide du gaz de déplacement.
EP03729378A 2002-01-07 2003-01-07 Procede de nettoyage d'un article Withdrawn EP1472017A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US34650702P 2002-01-07 2002-01-07
US346507P 2002-01-07
PCT/US2003/000529 WO2003057377A1 (fr) 2002-01-07 2003-01-07 Procede de nettoyage d'un article

Publications (2)

Publication Number Publication Date
EP1472017A1 true EP1472017A1 (fr) 2004-11-03
EP1472017A4 EP1472017A4 (fr) 2007-03-21

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EP03729378A Withdrawn EP1472017A4 (fr) 2002-01-07 2003-01-07 Procede de nettoyage d'un article

Country Status (8)

Country Link
EP (1) EP1472017A4 (fr)
JP (1) JP2005515619A (fr)
KR (1) KR20040073548A (fr)
CN (1) CN1741863A (fr)
AU (1) AU2003235748A1 (fr)
CA (1) CA2472478A1 (fr)
TW (1) TWI291200B (fr)
WO (1) WO2003057377A1 (fr)

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CN108598019A (zh) * 2018-04-17 2018-09-28 德淮半导体有限公司 晶圆清洗设备及其清洗方法
CN111744870A (zh) * 2020-06-24 2020-10-09 中国科学院苏州纳米技术与纳米仿生研究所广东(佛山)研究院 一种半导体器件金锡焊接后的清洗方法
CN114078692B (zh) * 2022-01-07 2024-02-20 浙江大学杭州国际科创中心 一种晶圆清洗方法和晶圆清洗设备
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EP1472017A4 (fr) 2007-03-21
KR20040073548A (ko) 2004-08-19
WO2003057377A1 (fr) 2003-07-17
AU2003235748A1 (en) 2003-07-24
CA2472478A1 (fr) 2003-07-17
TWI291200B (en) 2007-12-11
TW200412631A (en) 2004-07-16
CN1741863A (zh) 2006-03-01
JP2005515619A (ja) 2005-05-26

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