WO2020100593A1 - 半導体部品用洗浄剤及びその利用 - Google Patents
半導体部品用洗浄剤及びその利用 Download PDFInfo
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- WO2020100593A1 WO2020100593A1 PCT/JP2019/042576 JP2019042576W WO2020100593A1 WO 2020100593 A1 WO2020100593 A1 WO 2020100593A1 JP 2019042576 W JP2019042576 W JP 2019042576W WO 2020100593 A1 WO2020100593 A1 WO 2020100593A1
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- 238000001039 wet etching Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- 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
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3263—Amides or imides
-
- 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
- C11D7/34—Organic compounds containing sulfur
-
- 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
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- 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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/34—Organic compounds containing sulfur
-
- 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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/378—(Co)polymerised monomers containing sulfur, e.g. sulfonate
-
- 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
-
- 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
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- 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
- H01L21/02041—Cleaning
-
- 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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
-
- 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
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/22—Electronic devices, e.g. PCBs or semiconductors
Definitions
- the present specification relates to a cleaning agent for semiconductor parts and its use.
- a polymer having a sulfonic acid group or a salt thereof (hereinafter, also referred to as a sulfonic acid polymer) is industrially used in a wide variety of fields such as a papermaking dispersant, a coagulant, a thickener, and a detergent. ..
- Patent Document 1 a semiconductor component cleaning agent containing a sulfonic acid polymer as a main component is disclosed. It is described that this cleaning agent can efficiently remove metal impurities remaining on semiconductor components after CMP (chemical mechanical polishing).
- the present specification provides a cleaning agent for semiconductor parts, which enables to obtain higher quality semiconductor parts.
- a cleaning agent for semiconductor parts comprising a sulfonic acid group-containing polymer, A cleaning agent for semiconductor components, wherein the content of at least one metal selected from the group consisting of Na, Al, K, Ca and Fe is 0.7 ppm or less.
- a cleaning method comprising a step of cleaning the semiconductor component after the polishing treatment with the cleaning agent according to any one of [1] to [9].
- a method of manufacturing a semiconductor component comprising a cleaning step of cleaning the surface of the semiconductor component with the cleaning agent according to any one of [1] to [9].
- a method of manufacturing a semiconductor component comprising a cleaning step of cleaning the surface of the semiconductor component after the polishing treatment with the cleaning agent according to any one of [1] to [9].
- the present specification provides a cleaning agent for semiconductor components.
- the cleaning agent for semiconductor parts disclosed in the present specification (hereinafter, also simply referred to as “main cleaning agent”) contains a sulfonic acid group-containing polymer, and the content of a specific type of metal in the cleaning agent is 0.
- the content is 7 ppm or less
- the metal of the specific type that is, metal impurities
- the contamination level is easily suppressed. It is possible to obtain a good semiconductor component. Therefore, according to the present cleaning agent, a high-quality semiconductor component can be obtained without further requiring a step of removing metal impurities after cleaning.
- the cleaning method and the semiconductor component manufacturing method disclosed in this specification (hereinafter, also referred to as “the manufacturing method”) and the like can produce the same effects as those of the cleaning agent.
- (meth) acrylic means acrylic and / or methacrylic
- (meth) acrylate means acrylate and / or methacrylate
- (meth) acrylamide means It means acrylamide and / or methacrylamide
- (meth) allyl means allyl and / or methallyl.
- the “polymer” means a polymer obtained by polymerizing one kind or two or more kinds of monomers.
- polymer means various liquids containing a polymer, for example, a polymerization reaction liquid after polymerization, a polymer solution containing the polymerization reaction liquid for the purpose of preservation, or a product sold as a polymer solution. It can take the form that exists in the form. It should be noted that various liquids containing such a polymer include a "polymer", a polymerization reaction liquid thereof, and optionally a residual component for reaction such as an unreacted monomer and an initiator.
- the "cleaning agent” is an agent used for cleaning the surface to be cleaned, and a polymer having a structural unit derived from a monomer having a sulfonic acid group or a salt thereof as an active ingredient.
- the cleaning agent can be used, for example, when an appropriate medium is mixed and the surface to be cleaned is actually cleaned.
- the medium mixed with the cleaning agent include water, a mixed medium of water and alcohol, a mixed medium containing water and an organic solvent compatible with water, and the like.
- the detergent can contain a sulfonic acid group-containing polymer.
- the sulfonic acid group-containing polymer contained in the present detergent (hereinafter, also referred to as the present polymer) is not particularly limited to polymer forms such as random copolymers in the case of copolymers and various block copolymers. The molecular weight and distribution thereof are not particularly limited.
- the present cleaning agent can set the content of a specific type of metal in the cleaning agent to a content not more than a predetermined amount.
- the metal content in this cleaning agent will be described later.
- the present polymer is a polymer having a structural unit derived from a monomer containing a sulfonic acid group or a salt thereof (hereinafter, also referred to as a sulfonic acid (salt) group-containing monomer).
- a sulfonic acid (salt) group-containing monomer examples include unsaturated monomers having sulfonic acid or a salt thereof and further having an unsaturated group such as a polymerizable vinyl group.
- Examples of such a monomer or a salt thereof include isoprenesulfonic acid, (meth) acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, ⁇ -methylstyrenesulfonic acid, (meth) allylsulfonic acid, vinylsulfonic acid, Unsaturated (meth) allyl ether monomers such as isoamylene sulfonic acid, eg, 2-hydroxy-3- (meth) allyloxy-1-propane sulfonic acid, sulfoethyl (meth) acrylate, eg, 2-methyl- Examples thereof include conjugated diene sulfonic acids such as 1,3-butadiene-1-sulfonic acid, 2-hydroxy-3-acrylamidopropanesulfonic acid and salts thereof.
- the sulfonic acid (salt) group-containing monomer can be used alone or in combination of two or more.
- (meth) acrylamido-2-methylpropanesulfonic acid such as 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof is mentioned from the viewpoint of excellent polymerizability.
- the salt in the sulfonic acid (salt) group-containing monomer is not particularly limited, and generally, an alkali metal salt such as potassium; an alkaline earth metal salt such as calcium or magnesium; ammonia; tetrahydroxide Ammonium salts such as quaternary ammonium hydroxide such as methylammonium, tetraethylammonium hydroxide and tetrabutylammonium hydroxide; alkyl such as methylamine, ethylamine, propylamine, dimethylamine, diethylamine, triethylamine, butylamine, dibutylamine and tributylamine.
- an alkali metal salt such as potassium
- an alkaline earth metal salt such as calcium or magnesium
- ammonia such as ammonia
- Ammonium salts such as quaternary ammonium hydroxide such as methylammonium, tetraethylammonium hydrox
- Amines such as monoethanolamine, triethanolamine and diisopropanolamine; polyamines such as ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, triethylpentamine and tetraethylpentamine, organic amine salts such as morpholine and piperidine Can be mentioned.
- the above-mentioned salt is preferably a metal salt or a non-metal salt other than the metal to be restricted, from the viewpoint of the metal content specified in the present detergent. More preferred are ammonia, ammonium salts and various organic amine salts.
- the present polymer may further contain a polymer having a structural unit derived from a monomer containing a carboxy group or a salt thereof (hereinafter, also referred to as a carboxy (salt) group-containing monomer).
- carboxy (salt) group-containing monomer examples include unsaturated monomers having a carboxy (salt) group and further having an unsaturated group such as a polymerizable vinyl group.
- examples of such a monomer include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, carboxy group-containing vinyl compounds such as 2-carboxyethyl (meth) acrylate; maleic anhydride, itacone anhydride.
- Unsaturated acid anhydrides such as acids and citraconic anhydride; half ester compounds of the unsaturated acid anhydrides and alkyl alcohols; and salts thereof, and the like, and one or more of them are used. can do.
- (meth) acrylic acid, maleic acid, and maleic anhydride are preferable, in that the polymerizability is good and sufficient hydrophilicity can be imparted to the obtained polymer, and among them, acrylic acid is more preferable. preferable.
- the total mass of the sulfonic acid (salt) group-containing monomer is, for example, 1% by mass or more based on the total mass of the monomer composition, and, for example, 2 Mass% or more, for example 5 mass% or more, for example 10 mass% or more, for example 30 mass% or more, for example 60 mass% or more, and for example 90 mass% or more Further, it may be, for example, 95% by mass or more, or may be, for example, 99% by mass or more, and may be, for example, 100% by mass.
- the total mass thereof is, for example, 99% by mass or less, or 95% by mass or less, or 90% by mass or less, or 60% by mass or less, or 30% by mass or less, for example. And is, for example, 10% by mass or less, for example, 5% by mass or less, and for example, 2% by mass or less.
- the lower limit and the upper limit of these total masses are set in consideration of the substance to be polished, the cleaning performance, etc. However, if it is 1 mass% or more and 100 mass% or less, the number of surface defects and the number of organic residues are reduced.
- it is 10% by mass or more and 100% by mass or less, and further preferable that it is, for example, 20% by mass or more and 100% by mass or less, and, for example, 50% by mass. % Or more and 100% by mass or less is more preferable, and for example, 95% by mass or more and 100% by mass or less is more preferable.
- the said mass% when defining the mass% of a certain kind of monomer with respect to the total mass of the monomer composition for obtaining one kind of polymer, the said mass% is said monomer composition. It defines the mass% of the structural unit derived from the certain monomer in the polymer obtained by polymerizing. Similarly, when defining the mass% of another specific monomer to the total mass of a specific monomer in the monomer composition, the mass% is obtained by polymerizing such a monomer composition. The mass% of the structural unit derived from another specific monomer with respect to the total mass of the structural unit derived from the specific monomer in a polymer shall be defined.
- the total mass of the carboxy (salt) group-containing monomer is, for example, 0% by mass or more based on the total mass of the monomer composition, and, for example, 1 mass% or more, for example 2 mass% or more, for example 5 mass% or more, for example 10 mass% or more, for example 30 mass% or more, for example 60 mass% or more And is, for example, 90% by mass or more, and for example, 95% by mass or more, and may be, for example, 99% by mass.
- the total mass thereof is, for example, 99% by mass or less, or 90% by mass or less, or 60% by mass or less, or 30% by mass or less, or 10% by mass or less, for example.
- the lower limit and the upper limit of these total masses are set in consideration of the substance to be polished, cleaning performance, etc., but if it is 0 mass% or more and 90 mass% or less, the number of surface defects and the number of organic residues are reduced. Therefore, it is preferable.
- the ratio of the sulfonic acid (salt) group-containing monomer in the sulfonic acid (salt) group-containing monomer and the carboxy (salt) group-containing monomer is, for example, based on the total mass of these monomers. 10% by mass or more, for example 30% by mass or more, and for example 50% by mass or more, for example 70% by mass or more, and for example 90% by mass or more, and for example 95% by mass or more And is, for example, 97% by mass or more, for example, 98% by mass or more, and for example, 99% by mass or more, and may be, for example, 100% by mass.
- the proportion of the sulfonic acid (salt) group-containing monomer is, for example, 99% by mass or less, also 98% by mass or less, 97% by mass or less, and 95% by mass or less, for example. Or, for example, 90% by mass or less, or, for example, 70% by mass or less, or, for example, 50% by mass or less, or, for example, 30% by mass or less, or, for example, 20% by mass or less.
- the lower limit and the upper limit of these total masses are set in consideration of the substance to be polished, the cleaning performance, etc. However, if it is 1 mass% or more and 100 mass% or less, the number of surface defects and the number of organic residues are reduced.
- it is 10% by mass or more and 100% by mass or less, and further preferable that it is, for example, 20% by mass or more and 100% by mass or less, and, for example, 50% by mass. % Or more and 100% by mass or less is more preferable, and for example, 95% by mass or more and 100% by mass or less is more preferable.
- the present polymer may have a structural unit derived from a monomer copolymerizable with these monomers, in addition to the above-mentioned monomers, as long as the effect is not impaired.
- the monomer is not particularly limited, but includes, for example, amide group-containing vinyl monomer, N-vinyl lactam monomer, hydroxyl group-containing vinyl monomer, and (meth) acrylic acid alkyl ester monomer.
- Aromatic vinyl monomer, amino group-containing vinyl monomer, polyoxyalkylene group-containing vinyl monomer, alkoxy group-containing vinyl monomer, cyano group-containing vinyl monomer, vinyl ether monomer, vinyl ester monomer Examples include monomers and conjugated dienes. These can be used alone or in combination of two or more.
- amide group-containing vinyl monomer examples include (meth) acrylamide; N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N -Butyl (meth) acrylamide, N-isobutyl (meth) acrylamide, N-tert-butyl (meth) acrylamide, N-hexyl (meth) acrylamide, N-heptyl (meth) acrylamide, N-octyl (meth) acrylamide, 2 N-monoalkyl-substituted (meth) acrylamides such as ethylhexyl (meth) acrylamide, N-dodecyl (meth) acrylamide, N-octadecyl (meth) acrylamide; N-methylol (meth) acrylamide, N-ethyl
- N, N-dialkyl-substituted (meth) acrylamide N, N-dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N- N, N-dialkylaminoalkyl (meth) acrylamides such as diethylaminopropyl (meth) acrylamide; N- (meth) acryloylmorpholine, N- (meth) acryloylthiomorpholine, N- (meth) acryloylpiperidine, N- (meth) N- (meth) acryloyl cyclic amide compounds such as acryloylpyrrolidine; N-vinylacetamide, N-vinylpropionic acid amide, N-vinylbutyric acid amide and the like, and one or more of them should be used.
- N-vinyllactam monomer examples include N-vinylpyrrolidone, N-vinylpiperidone, N-vinylmorpholinone, N-vinylcaprolactam, N-vinyl-1,3-oxazin-2-one, N-vinyl- 3,5-morpholinedione and the like can be mentioned, and one or more of these can be used.
- hydroxyl group-containing vinyl monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and polyethylene glycol mono (meth) acrylate. Among these, one kind or two or more kinds can be used.
- alkyl (meth) acrylate monomer examples include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and n- (meth) acrylate.
- Aromatic vinyl monomers include styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, ⁇ -methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 4-tert-butyl. Examples thereof include styrene, tert-butoxystyrene, vinyltoluene, vinylnaphthalene, halogenated styrene and the like. These can be used alone or in combination of two or more.
- Examples of the vinyl monomer containing an amino group include dimethylaminomethyl (meth) acrylate, diethylaminomethyl (meth) acrylate, 2-dimethylaminoethyl (meth) acrylate, 2-diethylaminoethyl (meth) acrylate, and (meth ) 2- (di-n-propylamino) ethyl acrylate, 2-dimethylaminopropyl (meth) acrylate, 2-diethylaminopropyl (meth) acrylate, 2- (di-n-propylamino) (meth) acrylate ) Propyl, 3-dimethylaminopropyl (meth) acrylate, 3-diethylaminopropyl (meth) acrylate, 3- (di-n-propylamino) propyl (meth) acrylate, and the like. These can be used alone or in combination of two or more.
- vinyl monomer containing a polyoxyalkylene group examples include (meth) acrylic acid ester of alcohol having a polyoxyethylene group and / or a polyoxypropylene group. These can be used alone or in combination of two or more.
- alkoxy group-containing vinyl compound examples include 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2- (n-propoxy) ethyl (meth) acrylate, and 2- (n) methacrylate acrylate.
- n-butoxy) ethyl, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 2- (n-propoxy) propyl (meth) acrylate, 2- (n- (meth) acrylate Butoxy) propyl and the like can be mentioned. These can be used alone or in combination of two or more.
- cyano group-containing vinyl monomer examples include cyanomethyl (meth) acrylate, 1-cyanoethyl (meth) acrylate, 2-cyanoethyl (meth) acrylate, 1-cyanopropyl (meth) acrylate, and (meth) acrylic acid.
- vinyl ether monomers examples include vinyl methyl ether, vinyl ethyl ether, vinyl-n-butyl ether, vinyl phenyl ether, vinyl cyclohexyl ether and the like. These may be used alone or in combination of two or more.
- vinyl ester monomers examples include vinyl formate, vinyl acetate, vinyl propionate and the like. These can be used alone or in combination of two or more.
- 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-hexadiene, 4,5 -Diethyl-1,3-octadiene, 3-butyl-1,3-octadiene, chloroprene and the like can be mentioned. These can be used alone or in combination of two or more.
- maleimide compounds such as maleimide, N-methylmaleimide, N-butylmaleimide, N-phenylmaleimide and N-cyclohexylmaleimide; maleic acid ester compounds; itaconic acid ester compounds; N-vinylheterocyclic compounds such as vinylpyridine Is mentioned.
- the amount of the above-mentioned other monomer used is not particularly limited, but is 0% by mass or more based on the total mass of the monomer composition used for one polymer used in the present polymer. It is 50% by mass or less, for example, 0% by mass or more and 40% by mass or less, and for example, 0% by mass or more and 30% by mass or less.
- the weight average molecular weight (Mw) of the present polymer is not particularly limited, but from the viewpoint of production stability, it is, for example, 1000 to 1,000,000, for example, 2000 to 500000, and for example, 3000 to 100000. Is. When used as a cleaning agent for semiconductors, it is, for example, 1000 to 1,000,000, for example, 2000 to 100000, and for example, 5000 to 50,000 from the viewpoint of cleaning performance.
- the weight average molecular weight can be measured by gel permeation chromatography (GPC) using a standard substance such as sodium polyacrylate.
- the concentration of the sulfonic acid (salt) group-containing polymer contained in the detergent is not particularly limited, but is preferably 0.01% by mass or more and 40% by mass or less.
- the lower limit value of the same concentration is 0.01% by mass or more, effective cleaning performance is ensured, which is preferable from the viewpoint of reducing surface defects and organic residues.
- the lower limit value is more preferably 0.1% by mass or more, further preferably 0.5% by mass or more, and further preferably 1.0% by mass or more.
- the upper limit value is 40% by mass or less, a detergent having a low viscosity and good handleability can be obtained.
- the upper limit may be 30% by mass or less, or 20% by mass or less. Further, when the upper limit value is 10% by mass or less, it is preferable because the corrosion resistance becomes good.
- the present cleaning agent can set the content of a specific type of metal in the cleaning agent to a predetermined content or less.
- the specific type of metal include Na, Al, K, Ca and Fe, although they vary depending on the type of polymer.
- These metals are metal species that can be eluted from the liquid contact element (polymer reaction container or the like) described later used in the production process of the present polymer, and are metal species that contaminate semiconductor components such as wafers. That is, these metals are the metal species whose source of contamination has been overlooked in the past, and it is difficult to remove them.
- the content of at least one of these metals is set to a predetermined content or less in the present cleaning agent, when the present cleaning agent is used for cleaning semiconductor components, it remains on the surface of the semiconductor component after cleaning. It is possible to preferably reduce the amount of metal impurities that occur. Preferably, two, more preferably three, even more preferably four, and most preferably all of these metals are targeted.
- the metal is, for example, at least Na, and is, for example, Na and Fe, and is, for example, Na, Fe and Ca, and is, for example, Na, Fe, Ca and K, and is, for example, Na, Fe, Ca, K and Al.
- the content of at least one selected from the above-mentioned five kinds of metals can be, for example, 0.7 ppm or less. This is because when it is 0.7 ppm or less, it is possible to provide the semiconductor component with excellent cleaning performance as compared with the conventional case.
- the content is also, for example, 0.5 ppm or less, and for example, 0.4 ppm or less, and for example, 0.3 ppm or less, and for example, 0.2 ppm or less, and for example, 0.1 ppm or less, It is, for example, 0.05 ppm or less, and for example, 0.01 ppm or less.
- the method for measuring the metal element in dilute sulfuric acid which will be described later, can be used.
- the upper limit of the content can be set to the following.
- the upper limit of the content of Na in the present cleaning agent is also, for example, 0.4 ppm, and is, for example, 0.2 ppm, also, for example, 0.1 ppm, and is, for example, 0.05 ppm, and is, for example, 0 ppm. 0.04 ppm, for example 0.02 ppm.
- the upper limit of the Al content is, for example, 0.1 ppm, also, for example, 0.05 ppm, also, for example, 0.02 ppm, and for example, 0.01 ppm.
- the upper limit of the content of K is also, for example, 0.1 ppm, for example 0.08 ppm, also for example 0.05 ppm, for example 0.03 ppm, for example 0.02 ppm, and also for example It is 0.01 ppm.
- the upper limit of the Ca content is also, for example, 0.3 ppm, and is, for example, 0.2 ppm, and is, for example, 0.1 ppm, and is, for example, 0.08 ppm, and, for example, 0.06 ppm, for example 0.05 ppm, also for example 0.04 ppm, for example 0.03 ppm, for example 0.02 ppm.
- the upper limit for the Fe content is also, for example, 0.3 ppm, for example 0.25 ppm, for example 0.2 ppm, and for example 0.1 ppm.
- the content of Mg, Cr, Ni, Zn, Ta may be limited. Although these metals are unlikely to be mixed in the cleaning agent due to the liquid contact element, they are known as metals that contaminate semiconductor components.
- at least one selected from these metals can be, for example, 0.7 ppm or less.
- the content is also, for example, 0.5 ppm or less, for example, 0.5 ppm or less, for example, 0.3 ppm or less, for example, 0.2 ppm or less, and for example, 0. It is 1 ppm or less.
- the contents of Mn, Cu, Ti, Co, Zr, Ag, Sn, W and Pb may be further limited.
- These metals are also known as metals that contaminate semiconductor components, although they are unlikely to be mixed in the cleaning agent due to the liquid contact element.
- at least one selected from these metals can be, for example, 0.7 ppm or less.
- the content is also, for example, 0.5 ppm or less, for example, 0.5 ppm or less, for example, 0.3 ppm or less, for example, 0.2 ppm or less, and for example, 0. It is 1 ppm or less.
- the cleaning agent can be used for cleaning semiconductor components of various materials and shapes.
- the material forming the semiconductor component to be cleaned to which the present cleaning agent is applied is not particularly limited, but examples thereof include silicon, glass, and ceramics.
- the surface material of the semiconductor part to be cleaned to which the present cleaning agent can be applied is not particularly limited, and examples thereof include single crystal silicon, polycrystalline silicon, amorphous silicon, thermal silicon oxide film, non-doped silicate glass film, phosphorus-doped silicate glass film, and boron.
- TEOS tetraethyl orthosilicate
- plasma CVD oxide film silicon nitride film, silicon carbide film, silicon oxycarbide film, silicon oxynitride film, silicon carbonitride film, or silicon Examples thereof include an oxycarbonitride film.
- metal, glass, quartz, crystal, ceramics and the like are also included.
- the surface to be cleaned may be composed of these materials alone, or may be patterned or laminated with two or more kinds of materials having a certain distribution.
- the method for producing a cleaning agent for semiconductor parts can include a polymerization step of polymerizing one or more monomers or salts thereof as described above. ..
- a polymerization step for example, one kind or two or more kinds of monomers or salts thereof are added in the presence of a polymerization initiator at a reaction temperature of usually 20 to 200 ° C., preferably 40 to 150 ° C.
- the (co) polymer can be produced by carrying out a polymerization reaction for about 20 hours, preferably for 1 to 15 hours.
- the monomers used for the polymerization can be sequentially added and polymerized.
- the term “sequential polymerization” refers to adding a monomer component to a polymerization system within a predetermined time in a constant amount per unit time or by changing an addition amount.
- the polymerization method in the polymerization step is not particularly limited, but a solution polymerization method is preferable.
- solution polymerization the present polymer can be obtained as a uniform solution.
- a polymerization solvent for solution polymerization for example, water or a mixture of water and an organic solvent miscible with water can be used.
- the organic solvent are not particularly limited as long as they can be mixed with water, and examples thereof include tetrahydrofuran, 1,4-dioxane, dimethylformamide, alcohols and the like.
- a known polymerization initiator can be used, but a radical polymerization initiator is particularly preferably used.
- the radical polymerization initiator include persulfates such as sodium persulfate, potassium persulfate and ammonium persulfate, hydroperoxides such as t-butyl hydroperoxide, water-soluble peroxides such as hydrogen peroxide, and methyl ethyl ketone.
- Ketone peroxides such as peroxides and cyclohexanone peroxide, dialkyl peroxides such as di-t-butyl peroxide, t-butylcumyl peroxide, t-butylperoxypivalate, t-hexylperoxypivalate, etc.
- Oil-soluble peroxides such as peroxyesters of 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2 -Methylbutyronitrile), 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) propionamide], 2,2'-azobis [2- (2-imidazolin-2-yl) propane] Examples thereof include azo compounds such as disulfate dihydrate and 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] tetrahydrate.
- the radical polymerization initiator may be used alone or in combination of two or more.
- the polymerization step from the viewpoint of the metal content of the detergent to be produced, those which do not inherently contain the metal component or whose amount is suppressed can be preferably used. From this point of view, for example, ammonium persulfate, peroxides and azo compounds can be mentioned.
- the ratio of the radical polymerization initiator to be used is not particularly limited, but it is preferably 0.01 to 10% by mass based on the total weight of all the monomers constituting the entire water-soluble polymer, and is preferably 0. The proportion of 05 to 7 mass% is more preferable, and the proportion of 0.1 to 4 mass% is further preferable.
- a chain transfer agent may be appropriately added to the polymerization system in order to adjust the molecular weight, if necessary.
- the chain transfer agent include mercaptoacetic acid, mercaptopropionic acid, 2-propanethiol, 2-mercaptoethanol, 3-mercapto-1,2-propanediol and the like.
- the polymerization method in the polymerization step is a living polymerization method such as a reversible addition-fragmentation chain transfer (RAFT) method, a nitroxide-mediated polymerization (NMP) method, an atom transfer radical polymerization, depending on the molecular weight and distribution of the polymer to be synthesized.
- RAFT reversible addition-fragmentation chain transfer
- NMP nitroxide-mediated polymerization
- ATRP reversible addition-fragmentation chain transfer
- NMP nitroxide-mediated polymerization
- TMP organic tellurium-mediated living radical polymerization
- RAFT agent specific polymerization control agent
- RAFT agent a specific polymerization control agent
- the molecular weight of the polymer can be adjusted by the charging ratio of the monomer and the RAFT agent.
- the RAFT agent is not particularly limited, and examples thereof include various known RAFT agents such as dithioester compounds, xanthate compounds, trithiocarbonate compounds and dithiocarbamate compounds.
- the ratio of the RAFT agent used is appropriately adjusted depending on the type of the monomer used and the RAFT agent, and the like, but it is 0.01 to 100% based on the total weight of all the monomers constituting the whole water-soluble polymer. It is preferably used in a ratio of 5.0% by mass, more preferably 0.05 to 3.0% by mass, and further preferably 0.1 to 2.0% by mass.
- a specific alkoxyamine compound having a nitroxide is used as a living radical polymerization initiator, and the polymerization proceeds via a nitroxide radical derived from this.
- the type of nitroxide radical to be used is not particularly limited, but from the viewpoint of polymerization controllability at the time of polymerizing monomers such as acrylamide derivatives including acrylate and acrylamide, for example, a compound represented by the general formula (1) as a nitroxide compound. Is preferably used.
- R 1 is an alkyl group having 1 to 2 carbon atoms or a hydrogen atom
- R 2 is an alkyl group having 1 to 2 carbon atoms or a nitrile group
- R 3 is-(CH 2 ) m- (m Is 0 to 2)
- R 4 and R 5 are alkyl groups having 1 to 4 carbon atoms.
- the acid of the polymer having a monomer having an acid group such as a non-oxidizing acid group and the polymer having a structural unit derived from the monomer in the step of producing a sulfonic acid group-containing polymer may be in the form of a salt. However, it may be in the free acid form. When the salt is used, it is the salt already described. When a free acid monomer is used in the polymerization step, a base can be added after the polymerization step to form a polymer salt as a part of the polymerization step. The type of salt can be exchanged by ion exchange.
- the degree of neutralization of the acid group is not particularly limited.
- a monomer such as a non-oxidizing acid group or a heavy metal It is preferable to sufficiently neutralize the acid groups of the combined polymer so that the pH of the process liquid does not drop too much.
- the pH is more than 1, for example, 2 or more, for example, 3 or more, for example, 4 or more, or for example 5 or more.
- the degree of neutralization can be, for example, 90 mol% or more and 150 mol% or less, and, for example, 90 mol% or more and 140 mol% or less, and, for example, 90 mol% or more. It can be set to mol% or more and 130 mol% or less, and for example, 90 mol% or more and 120 mol% or less.
- the present detergent manufacturing method can include a mixing step of adding an aqueous medium to the detergent containing the sulfonic acid group-containing polymer described above.
- the mixing step include a method in which a pipe for supplying a cleaning agent and a pipe for supplying an aqueous medium are merged in the middle to mix them, and the mixed cleaning agent is supplied to the surface to be cleaned.
- This mixing is a method of colliding and mixing liquids with each other through a narrow passage under pressure; a method of repeatedly filling a pipe with a filling material such as a glass pipe and separating and combining the liquid flows; A commonly used method such as a method of providing blades that rotate by power can be adopted.
- a pipe for supplying a cleaning agent and a pipe for supplying an aqueous medium are provided independently, and a predetermined amount of liquid is supplied from each to the surface to be cleaned and mixed on the surface to be cleaned.
- a method may be mentioned in which a predetermined amount of a cleaning agent and an aqueous medium are put into one container and mixed, and then the mixed cleaning agent is supplied to the surface to be cleaned.
- the total mass of the aqueous medium mixed with the polymer can be, for example, 4 times or more and 1 million times or less.
- the total mass is, for example, 50 times or more and 100,000 times or less, or, for example, 100 times or more and 50,000 times or less, or, for example, 500 times or more and 10,000 times or less, or, for example, 1000 times or more and 5000 times or less.
- the aqueous medium the same medium as the polymerization solvent used for the sulfonic acid group-containing polymer described above may be used, or alcohol or the like may be appropriately added if necessary.
- liquid contact elements In the present method for producing a detergent, one or more liquid contact elements to which one or more process liquids, which are liquids used in at least a part of the polymerization process and the mixing process, come into contact with the above-mentioned process. It is preferable to suppress mixing of metal components into the liquid.
- Examples of the step liquid in the polymerization step include a reaction medium containing an additive such as a polymerization initiator and a catalyst in addition to a solvent and a monomer used for producing the present polymer, a reaction liquid during the polymerization reaction, and a polymerization reaction.
- the reaction solution after completion may be mentioned.
- Examples of the step liquid in the mixing step include a liquid in which a detergent containing the present polymer is dissolved or dispersed, an aqueous medium for mixing with the detergent, and the like.
- the liquid contact element in the polymerization step, has a reaction vessel having a step liquid in the above-mentioned polymerization step and a portion contacted by vaporized vapor of the step liquid, a conduit member, a liquid feeding member, a stirring member, and a heating member. , A filter member, a storage container, a measuring instrument, and the like.
- a reaction vessel having a step liquid in the above-mentioned mixing step and a portion which is brought into contact with vaporized vapor of the step liquid, a conduit member, a liquid feeding member, a stirring member, a heating member, a filtering member, and a storage examples include containers and measuring instruments.
- the content of the above-mentioned specific type of metal can be suppressed to a predetermined content or less by suppressing the mixing of the metal component from the liquid contact element into the process liquid.
- the following modes can be adopted.
- the liquid contact element can be (a) a metal member having a metal component elution-resistant material on the liquid contact surface, or (b) a member mainly composed of the metal component elution-resistant material.
- the aspect of (a) is not particularly limited, but includes, for example, an aspect in which a metal component elution-resistant material is provided as a coating or lining on the surface of the liquid contact element that contacts the process liquid.
- Examples of the mode (b) include a mode in which a part or the whole of the liquid contact element is mainly composed of a metal component elution resistant material.
- mainly composed of a metal component-eluting resistant material means that the material is preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, and further preferably, all the materials. Is 80% by mass or more, more preferably 90% by mass or more, more preferably 95% by mass or more, still more preferably 99% by mass or more, still more preferably 100% by mass or more. There is.
- the metal component-eluting resistant material for example, when the following conditions; 80 g of dilute sulfuric acid having a concentration of 5 g / L is contacted with a contact area of 200 cm 2 and heated at 80 ° C. for 1 hour, dilute sulfuric acid is used. A material satisfying the requirement that the amount of each of Na, Al, K, Ca, and Fe is increased by 1 ppm or less is included. Dilute sulfuric acid is a non-oxidizing acid, and if the increase of each metal element is 1 ppm or less under the condition of 80 ° C. for 1 hour, the elution of the metal component can be sufficiently suppressed in the production process of the present polymer. Conceivable.
- the concentration of the metal element in the dilute sulfuric acid can be measured by ICP emission spectrometry (high frequency inductively coupled plasma emission spectrometry) or ICP mass spectrometry (high frequency inductively coupled plasma mass spectrometry). Typical measurement conditions are disclosed in this embodiment.
- the metal component elution resistant material does not inherently contain a metal having a greater ionization tendency than hydrogen (for example, K, Ca, Na, Mg, Al, Zn, Fe, Ni, Sn, Pb).
- a metal having a greater ionization tendency than hydrogen for example, K, Ca, Na, Mg, Al, Zn, Fe, Ni, Sn, Pb.
- the content of each metal element is about 10% by mass or less.
- the non-oxidizing acid is more preferably 1.0% by mass or less, still more preferably 0.1% by mass or less, and further preferably 0.01% by mass or less. This is because metals that have a higher ionization tendency than hydrogen tend to oxidize, and if the wetted element contains such metals, these metals may elute.
- metal component elution-resistant material satisfying such conditions include fluororesins (polytetrafluoroethylene: PTFE, perfluoroalkoxyalkane: PFA, perfluoroethylenepropene copolymer: FEP, ethylenetetrafluoroethylene copolymer: ETFE, polyvinylidene fluoride).
- fluororesins polytetrafluoroethylene: PTFE, perfluoroalkoxyalkane: PFA, perfluoroethylenepropene copolymer: FEP, ethylenetetrafluoroethylene copolymer: ETFE, polyvinylidene fluoride).
- PVDF polyvinyl fluoride: PVF, ethylene-chlorotrifluoroethylene copolymer: ECTFE, etc.
- polyolefin resin polyethylene, etc.
- tantalum and the like.
- the metal component elution-resistant material regardless of whether or not it is the above-mentioned material, for example, a material whose metal elution amount has been reduced by repeated use or washing, or by contact with a process liquid etc. Materials that have become passive are formed.
- the amount of at least one metal element or ion selected from the group consisting of Na, Al, K, Ca and Fe is, for example, 2 ppm or less in the process liquid containing the polymer. That is, when the content of each of these metal components is 2 ppm or less in the process liquid containing the polymer, it is possible to suppress the adverse effect of the presence of metal ions on the use of the produced detergent.
- the process liquid containing a polymer include a reaction liquid after completion of the polymerization reaction, a solution containing a cleaning agent, and the like.
- the content of the metal element or ion is, for example, 1.5 ppm or less, the same as 1.0 ppm or less, or for example, 0.5 ppm or less, or for example, 0.1 ppm. It is below, for example, 0.05 ppm or less.
- the measurement method of metal elements in dilute sulfuric acid can be applied.
- the present specification provides a cleaning method for cleaning a semiconductor component using the cleaning agent.
- This cleaning agent is used in the process of manufacturing semiconductor parts, for example, before and after CMP, before and after CVD (Chemical Vapor Deposition), after resist development, after dry etching, after wet etching, after dry ashing and after resist stripping. Can be used. Above all, it is preferably used for cleaning after CMP from the viewpoint of suppressing the content of metal impurities.
- a component made of the above materials can be used as the semiconductor component to be cleaned.
- a cleaning method for cleaning the semiconductor part to be cleaned with the present cleaning agent a known cleaning method usually used in the semiconductor field may be applied.
- a cleaning tank is filled with the main cleaning agent to immerse the semiconductor part to be cleaned.
- examples include methods such as a dip method, a spin method in which the main cleaning agent is rotated at a high speed while flowing the main cleaning agent from the nozzle onto the semiconductor element to be cleaned, and a spray method in which the main cleaning agent is sprayed onto the semiconductor element to be cleaned. Be done.
- a batch type cleaning apparatus for simultaneously cleaning a plurality of semiconductor components to be cleaned contained in a cassette, one semiconductor component to be cleaned mounted on a holder and cleaned. A single wafer cleaning device and the like can be mentioned.
- the cleaning process may be performed on the polishing surface plate by supplying the cleaning agent with the polishing pad attached to the semiconductor component after the polishing process as the cleaning target.
- the polishing pad physically wipes and removes foreign matter on the surface of the object to be cleaned, and as a result of the chemical cleaning action of the present cleaning agent, impurities on the surface are reduced.
- the cleaning step may be performed by removing the semiconductor component after the polishing treatment from the polishing platen and then supplying the cleaning agent to the semiconductor component (without using the polishing pad).
- impurities on the surface of the object to be cleaned are reduced based on the mechanical action when the cleaning agent is supplied by spraying or the like and the chemical cleaning action of the present cleaning agent.
- a physical cleaning operation using a cleaning cloth or a cleaning brush may be used together.
- the time in which the cleaning agent is brought into contact with the semiconductor components to be cleaned in order to clean the semiconductor components to be cleaned may be appropriately selected according to the cleaning method.
- a batch type cleaning device for example, 0.5 minutes or more and 1 hour or less. And 1 minute or more and 30 minutes or less, and 1 minute or more and 15 minutes or less, for example.
- it is, for example, 1 second or more and 15 minutes or less, or 5 seconds or more and 10 minutes or less, or 5 seconds or more and 5 minutes or less.
- the semiconductor component manufacturing method disclosed in the present specification can include a cleaning step of cleaning the surface of the semiconductor component to be cleaned using the cleaning agent.
- the semiconductor parts to be cleaned the parts made of various materials described above can be used.
- the cleaning method and the like in the cleaning step of the present manufacturing method can be the same as the above-described cleaning method.
- the cleaning agent disclosed in the present specification for cleaning the semiconductor component to be cleaned, foreign matter such as abrasive grains and polishing debris remaining on the surface of the component after CMP is reduced, and the foreign matter is removed. Occurrence of defects in the post-process due to the residual is suppressed. Furthermore, since the present cleaning agent contains a small amount of a specific metal, the amount of metal impurities remaining in the semiconductor component after cleaning is small. Therefore, according to this manufacturing method, a highly reliable semiconductor component can be manufactured. In addition, it is possible to significantly reduce the amount of chemical liquid used in the washing step, which is also preferable from the viewpoint of reducing the environmental load.
- Production Example 1 In a high-purity polyethylene container, 180 g of pure water, 99 g of 2-acrylamido-2-methylpropanesulfonic acid (ATBS) and 1 g of acrylic acid (ATBS: acrylic acid) as monomers for use in the production of the sulfonic acid group-containing polymer. The mass ratio of 99: 1) was added, and the mixture was stirred and dissolved at room temperature to prepare a sample of Production Example 1 (hereinafter, also referred to as a monomer solution of Production Example 1). Immediately thereafter, the metallic element in this monomer solution was measured.
- ATBS 2-acrylamido-2-methylpropanesulfonic acid
- ATBS acrylic acid
- the metal element was measured by an ICP emission spectroscopy analyzer and an ICP mass spectrometer. Specifically, it measured on the following measurement conditions. (1) After diluting 1 g of the liquid to be measured with 20 g of ultrapure water, 1 ml of nitric acid (ultra-purity reagent ultrapur-100 manufactured by Kanto Chemical Co., Inc.) was added to obtain a measurement sample. (2) The metal element content of the measurement sample was measured by an ICP emission spectroscopy analyzer (SPECTROCOS SOP) and an ICP mass spectrometer (Agilent 7700s). (3) For metal elements whose measured metal component amount by ICP emission spectroscopy was 1 ppm or more, the measured value was adopted. On the other hand, as for the metal component whose measured value is less than 1 ppm, the measurement result by ICP mass spectrometry was adopted.
- SPECTROCOS SOP ICP emission spectroscopy analyzer
- ICP mass spectrometer Agilent 7700s
- Example 1 When evaluated by the following metal elution property evaluation method, using a glass reaction container (with a tantalum thermocouple installed therein) that was determined to be a metal component elution resistant material, after introducing 180 g of pure water, 80 While heating at 80 ° C. and maintaining at 80 ° C., 280 g of the monomer solution of Production Example 1 and an ammonium persulfate solution (ammonium persulfate (APS) 2 g dissolved in 30 g of water) were used for 4 hours by using a quantitative pump. Was added to carry out the polymerization reaction. The polymer solution after the polymerization reaction was immediately stored in a high-purity polyethylene container, and the metal element concentration in the polymerization solution was measured. The results are shown in Table 1.
- the increase in the amount of each metal element selected from the above is 1 ppm or less, the container or the like is considered to be resistant to metal component elution, and when the amount exceeds 1 ppm, it is considered to be metal component elution.
- the metal component concentration was measured by an ICP emission spectrometer and an ICP mass spectrometer.
- Example 2 The same operation as in Example 1 was performed except that the reaction container was made of PFA resin (no tantalum thermocouple was installed).
- Example 3 The procedure of Example 1 was repeated, except that the reaction vessel was a SUS304 vessel whose surface was coated with ETFE resin (no tantalum thermocouple was installed).
- Example 4 Same as Example 1 except that the monomer solution prepared in Production Example 1 was neutralized with aqueous ammonia (120 mol% with respect to ATBS) and then polymerized in a SUS304 container (no tantalum thermocouple was installed). Operated.
- Example 5 180 g of pure water was placed in a PFA resin reaction vessel (no tantalum thermocouple was installed) and heated to 70 ° C., and 280 g of the monomer solution prepared in Test Example 1 and 2,2′-azobis [2 An aqueous solution of (-(2-imidazolin-2-yl) propane] disulfate dihydrate (VA-046B) (4 g of VA-046B dissolved in 30 g of water) was charged using a metering pump over 4 hours. Polymerization reaction was carried out in the same manner as above, and otherwise the same operation as in Example 1.
- Example 6 425 g of pure water was placed in a SUS304 container (no tantalum thermocouple was installed) whose surface was coated with ETFE resin, and heated to 90 ° C. Then, while maintaining 90 ° C, 425 g of pure water immediately contained 70 g of ASTB and acrylic. A monomer solution in which 30 g of acid was dissolved and an ammonium persulfate solution (3.5 g of ammonium persulfate in 30 g of pure water) were charged for 4 hours using a metering pump to carry out the polymerization reaction, and thereafter, The same operation as in Example 1 was performed.
- Example 7 A monomer solution prepared by dissolving 70 g of ATBS and 30 g of acrylic acid in 405 g of pure water, 0.1 g of ammonium persulfate and 2.0 g of 3-((((1-carboxyethyl) thio) carbonothioyl) thio) propanoic acid ( CESPA, RAFT agent) into a SUS304 container whose surface is coated with ETFE resin (no tantalum thermocouple is installed), and then heated to 70 ° C., a polymerization reaction is carried out for 4 hours while maintaining 70 ° C., After that, the same operation as in Example 1 was performed.
- CESPA, RAFT agent 3-((((1-carboxyethyl) thio) carbonothioyl) thio) propanoic acid
- Example 1 The same operation as in Example 1 was performed except that 180 g of pure water was used in a borosilicate glass container (with a thermocouple of SUS304 and a baffle plate installed inside).
- Comparative example 2 The same operation as in Comparative Example 1 was performed except that 2 g of sodium persulfate was used as the polymerization initiator.
- the metal concentration in the process liquid containing the polymer is effectively increased. It was found that it can be reduced easily and easily.
- Example 2 The polymers of Examples 2 to 7 and Comparative Examples 1 and 2 were also processed in the same manner as in Example 1.
- a contaminated silicon wafer was washed and dried in the same manner as above except that distilled water was used instead of the washing liquid, and then the amount of metal elements on the surface of the silicon wafer was measured. The results are shown in Table 2.
- cleaning semiconductor components with a cleaning liquid with a reduced content of contaminating metals is important for obtaining clean semiconductor components.
- a cleaning agent obtained by using a wetted element made of a material whose metal component elution is suppressed as a wetted element in the manufacturing process and having a sufficiently reduced content of Na, Al, K, Ca and Fe is a simple and efficient method for obtaining clean semiconductor parts because it can avoid the step of removing metal ions using an ion exchange resin and can reliably avoid unintentional contamination and rewashing. I understood it.
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Abstract
Description
本出願は、2018年11月16日に出願された日本国特許出願である特願2018-215817の関連出願であり、この出願に基づく優先権を主張するものであり、本出願は、また、2018年10月2日に出願された日本国特許出願である特願2018-187676及び2019年9月26日に出願された日本国特許出願である特願2019-175704の関連出願である。これらの関連する日本出願は、参照によりその全体が本明細書に組み込まれる。
Na、Al、K、Ca及びFeからなる群より選択される少なくとも1種の金属の含有量が0.7ppm以下である、半導体部品用洗浄剤。
[2]前記少なくとも1種の金属は、Naを含む、[1]に記載の半導体部品洗浄剤。
[3]前記少なくとも1種の金属は、さらに、Feを含む、[2]に記載の半導体部品洗浄剤。
[4]前記少なくとも1種の金属は、さらに、Caを含む、[3]に記載の半導体部品洗浄剤。
[5]前記少なくとも1種の金属は、さらに、Kを含む、[4]に記載の半導体部品洗浄剤。
[6]前記少なくとも1種の金属は、さらに、Alを含む、[5]に記載の半導体部品洗浄剤。
[7]前記スルホン酸基含有重合体は、2-アクリルアミド-2-メチルプロパンスルホン酸又はその塩に由来する構造単位を有する、[1]~[6]のいずれかに記載の半導体部品用洗浄剤。
[8]前記スルホン酸基含有重合体の全構造単位に対し、2-アクリルアミド-2-メチルプロパンスルホン酸又はその塩に由来する構造単位を、70質量%以上100質量%以下有する、[7]に記載の半導体部品用洗浄剤。
[9]前記スルホン酸基含有重合体の全構造単位に対し、カルボキシ基含有単量体に由来する構造単位を0質量%以上30質量%以下有する、[1]~[8]のいずれかに記載の半導体部品用洗浄剤。
[10]研磨処理後の半導体部品の洗浄剤である、[1]~[9]のいずれかに記載の半導体部品洗浄剤。
[11][1]~[9]のいずれかに記載の洗浄剤を用いて半導体部品を洗浄する工程、を備える、半導体部品の洗浄方法。
[12][1]~[9]のいずれかに記載の洗浄剤を用いて研磨処理後の半導体部品を洗浄する工程、を備える、洗浄方法。
[13]半導体部品の表面を、[1]~[9]のいずれかに記載の洗浄剤により洗浄する洗浄工程を備える、半導体部品の製造方法。
[14]研磨処理後の半導体部品の表面を、[1]~[9]のいずれかに記載の洗浄剤により洗浄する洗浄工程を備える、半導体部品の製造方法。
本洗浄剤は、スルホン酸基含有重合体を含有することができる。本洗浄剤が含有するスルホン酸基含有重合体(以下、本重合体ともいう。)は、共重合体の場合におけるランダムコポリマー、種々のブロックコポリマーなどのポリマー形態を特に限定するものではないほか、その分子量や分布等についても特に限定するものではない。
本重合体は、スルホン酸基又はその塩を含む単量体(以下、スルホン酸(塩)基含有単量体ともいう。)に由来する構造単位を有する重合体である。スルホン酸(塩)基含有単量体としては、スルホン酸又はその塩を有し、さらに重合可能なビニル基などの不飽和基を有する不飽和単量体が挙げられる。かかる単量体又はその塩としては、例えば、イソプレンスルホン酸、(メタ)アクリルアミド-2-メチルプロパンスルホン酸、スチレンスルホン酸、αーメチルスチレンスルホン酸、(メタ)アリルスルホン酸、ビニルスルホン酸、イソアミレンスルホン酸、例えば、2-ヒドロキシ-3-(メタ)アリルオキシ-1-プロパンスルホン酸などの不飽和(メタ)アリルエーテル系単量体、スルホエチル(メタ)アクリレート、例えば、2-メチル-1,3-ブタジエン-1-スルホン酸などの共役ジエンスルホン酸、2-ヒドロキシ-3-アクリルアミドプロパンスルホン酸及びこれらの塩などが挙げられる。
本重合体は、その効果を損なわない範囲において、上記した単量体のほか、これらの単量体と共重合可能な単量体に由来する構造単位を有することができる。かかる単量体としては、特に限定するものではないが、例えば、アミド基含有ビニル単量体、N-ビニルラクタム単量体、水酸基含有ビニル単量体、(メタ)アクリル酸アルキルエステル単量体、芳香族ビニル単量体、アミノ基含有ビニル単量体、ポリオキシアルキレン基含有ビニル単量体、アルコキシ基含有ビニル単量体、シアノ基含有ビニル単量体、ビニルエーテル単量体、ビニルエステル単量体、共役ジエン等が挙げられる。これらは、1種単独であるいは2種以上を組み合わせて用いることができる。
N-ビニルラクタム単量体としては、例えば、N-ビニルピロリドン、N-ビニルピペリドン、N-ビニルモルホリノン、N-ビニルカプロラクタム、N-ビニル-1,3-オキサジン-2-オン、N-ビニル-3,5-モルホリンジオン等が挙げられ、これらの内の1種又は2種以上を使用することができる。
本重合体の重量平均分子量(Mw)は、特に限定するものではないが、製造安定性の観点から、例えば、1000~1000000であり、また例えば、2000~500000であり、また例えば、3000~100000である。また、半導体用洗浄剤として使用した場合、洗浄性能の観点から、例えば、1000~1000000であり、また例えば、2000~100000であり、また例えば、5000~50000である。重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)により、ポリアクリル酸ナトリウム等の標準物質を用いて測定することができる。
本洗浄剤は、当該洗浄剤における特定種類の金属の含有量を、所定の含有量以下とすることができる。特定種類の金属としては、重合体の種類によっても異なるが、例えば、Na、Al、K、Ca及びFeが挙げられる。これらの金属は、本重合体の製造工程において用いる後述する接液要素(重合体反応容器等)から溶出し得る金属種であり、かつウェハなどの半導体部品を汚染する金属種である。すなわち、これらの金属は、従来、混入源が見過ごされてきた金属種であって除くことが難しかった金属である。本洗浄剤において、これらの金属の少なくとも1種の含有量を所定の含有量以下とすることにより、本洗浄剤が半導体部品の洗浄に用いられた場合に、洗浄後の半導体部品の表面に残留する金属不純物を好適に低減することができる。好ましくは、これらの金属のうち2種、さらに好ましくは3種、さらにまた好ましくは4種、最も好ましくは、これらの全てを対象とする。
本洗浄剤は、種々の材料及び形状の半導体部品の洗浄に用いることができる。本洗浄剤の適用の対象となる被洗浄半導体部品を構成する材料としては、特に限定されるものではないが、例えば、シリコン、ガラス、セラミックス等が挙げられる。本洗浄剤が適用可能な被洗浄半導体部品の表面材料は特に限定されず、例えば、単結晶シリコン、多結晶シリコン、アモルファスシリコン、熱シリコン酸化膜、ノンドープシリケートガラス膜、リンドープシリケートガラス膜、ボロンドープシリケートガラス膜、リンボロンドープシリケートガラス膜、テトラエチルオルトシリケート(TEOS)膜、プラズマCVD酸化膜、シリコン窒化膜、シリコン炭化膜、シリコン酸炭化膜、シリコン酸窒化膜、シリコン炭窒化膜、又はシリコン酸炭窒化膜等が挙げられる。さらに、金属、ガラス、石英、水晶、セラミックス等も挙げられる。被洗浄面は、これらの材料単独で構成される物であってもよいし、2種以上の材料がある分布を有してパターニングされたものや積層されたものであってもよい。
(重合工程)
半導体部品用洗浄剤の製造方法(以下、本洗浄剤製造方法ともいう。)は、既述したとおりの1種又は2種以上の単量体又はその塩を重合する重合工程を備えることができる。重合工程は、例えば、1種又は2種以上の単量体又はその塩を、重合開始剤の存在下、反応温度を、通常、20~200℃、好ましくは40~150℃で、0.1~20時間、好ましくは1~15時間にわたり重合反応させ、(共)重合体を製造することができる。例えば、一つの処方として、重合に使用する単量体を逐次添加し重合を行うことができる。ここで、逐次重合とは、単位時間あたり一定量で、あるいは添加量を変量させて単量体成分を重合系に所定時間内に投入することである。
スルホン酸基含有重合体の製造工程における非酸化性の酸基などの酸基を有する単量体及び当該単量体に由来する構造単位を有する重合体の酸は塩の形態であってもよいし、遊離の酸の形態であってもよい。塩とする場合には、既に記載した塩とする。重合工程で遊離酸の単量体を用いる場合には、重合工程の一部として、重合工程後に、塩基を加えて重合体塩とすることができる。なお、イオン交換により塩の種類を交換することもできる。
本洗浄剤製造方法は、上述したスルホン酸基含有重合体を含有する洗浄剤に水系媒体を加える混合工程を備えることができる。混合工程としては、例えば、洗浄剤を供給する配管と水系媒体を供給する配管とを途中で合流させて混合し、この混合された洗浄剤を被洗浄面に供給する方法が挙げられる。この混合は、圧力を付した状態で狭い通路を通して液同士を衝突混合する方法;配管中にガラス管などの充填物を詰め液体の流れを分流分離、合流させることを繰り返し行う方法;配管中に動力で回転する羽根を設ける方法など通常行われている方法を採用することができる。
本洗浄剤製造方法においては、重合工程及び混合工程の少なくとも一部に供される液体である1種又は2種以上の工程液が接液する1種又は2種以上の接液要素から前記工程液への金属成分の混入を抑制することが好ましい。
本明細書では、本洗浄剤を用いて半導体部品を洗浄する洗浄方法が提供される。本洗浄剤は、半導体部品を製造する過程において、例えば、CMP前後、CVD(Chemical Vapor Deposition)前後、レジスト現像後、ドライエッチング後、ウェットエッチング後、ドライアッシング後及びレジスト剥離後等の洗浄工程に用いることができる。なかでも、金属不純物の含有量が抑制されている観点から、CMP後の洗浄に用いられることが好ましい。被洗浄半導体部品としては上述した材料により構成される部品を用いることができる。
本明細書に開示される半導体部品の製造方法は、本洗浄剤を用いて、被洗浄半導体部品の表面を洗浄する洗浄工程を備えることができる。被洗浄半導体部品としては、上述した各種材料により構成される部品を用いることができる。本製造方法の洗浄工程における洗浄方法等は、上述した洗浄方法と同様とすることができる。
高純度ポリエチレン容器に、純水180gと、スルホン酸基含有重合体の製造に用いるための単量体として2-アクリルアミド-2-メチルプロパンスルホン酸(ATBS)99gとアクリル酸1g(ATBS:アクリル酸の質量比99:1)を投入して、室温で撹拌して溶解させて製造例1の試料(以下、製造例1の単量体溶液ともいう。)を調製した。その後、直ちにこの単量体溶液中の金属元素を測定した。
(1)測定対象である液1gを超純水20gで希釈した後、硝酸(関東化学社製、超高純度試薬ultrapur-100)1mlを加えて測定試料とした。
(2)上記測定試料の金属元素量を、ICP発光分光分析装置(SPECTROARCOS SOP)及びICP質量分析装置(Agilent7700s)により測定した。
(3)ICP発光分光分析による金属成分量測定値が1ppm以上であった金属元素については、当該測定値を採用した。一方、測定値が1ppm未満の金属成分については、ICP質量分析による測定結果を採用した。
以下の金属溶出性評価方法で評価したとき、耐金属成分溶出性材料であると肯定できたガラス製反応容器(内部にタンタルの熱電対を設置)を用いて、純水180gを投入後、80℃に加熱し、80℃に維持しつつ、製造例1の単量体溶液280gと、過硫酸アンモニウム溶液(過硫酸アンモニウム(APS)2gを水30gに溶解したもの)を4時間かけて定量ポンプを用いて投入して重合反応を実施した。重合反応後の重合体溶液を直ちに高純度ポリエチレン容器に保存し、当該重合溶液中の金属元素濃度を測定した。結果を表1に示す。
濃度5g/Lの希硫酸80gを、接触面積200cm2で接液要素に接触させた状態で、80℃で1時間加熱したとき、希硫酸中のNa、Al、K、Ca及びFeからなる群から選択される各金属元素の増量が1ppm以下であるとき、その容器等を耐金属成分溶出性であるとし、1ppmを超えるとき、金属成分溶出性であるとする。なお、金属成分の濃度は、ICP発光分析装置及びICP質量分析装置により測定した。
これらの例についても、以下のように操作した。結果を表1に示す。
反応容器をPFA樹脂(タンタルの熱電対は設置せず)とした以外は、実施例1と同様に操作した。
反応容器をETFE樹脂で表面をコートしたSUS304製容器(タンタルの熱電対は設置せず)とした以外は、実施例1と同様に操作した。
製造例1で調製した単量体溶液をアンモニア水(ATBSに対して120mol%)で中和後、SUS304製容器(タンタルの熱電対は設置せず)で重合した以外は、実施例1と同様に操作した。
純水180gをPFA樹脂製の反応容器(タンタルの熱電対は設置せず)に入れて70℃に加熱し、試験例1で調製した単量体溶液280gと、2,2’-アゾビス[2-(2-イミダゾリン-2-イル)プロパン]二硫酸塩二水和物(VA-046B)の水溶液(VA-046B4gを水30gに溶解したもの)を4時間かけて定量ポンプを用いて投入して重合反応を実施し、その他は、実施例1と同様に操作した。
純水425gをETFE樹脂で表面をコートしたSUS304製容器(タンタルの熱電対は設置せず)に入れて90℃に加熱し、その後、90℃を維持しつつ、直ちに純水425gにASTB70g及びアクリル酸30gを溶解させた単量体溶液と過硫酸アンモニウム溶液(過硫酸アンモニウム3.5gを純水30gに溶解したもの)を4時間かけて定量ポンプを用いて投入して重合反応を実施し、その後は、実施例1と同様に操作した。
純水405gにATBS70gとアクリル酸30gを溶解させた単量体溶液と、過硫酸アンモニウム0.1g及び3-((((1-カルボキシエチル)チオ)カルボノチオイル)チオ)プロパン酸2.0g(CESPA、RAFT剤)を、ETFE樹脂で表面をコートしたSUS304容器(タンタル熱電対は設置せず)に投入した後、70℃に加熱し、70℃を維持しつつ4時間重合反応を実施し、その後は実施例1と同様に操作した。
純水180gを、ほう珪酸ガラス容器(内部にSUS304の熱電対と邪魔板を設置したもの)を用いた以外は、実施例1と同様に操作した。
重合開始剤を過硫酸ナトリウム2gとした以外は、比較例1と同様に操作した。
鏡面研磨されたシリコンウェハ(2cm×2cm)を、実施例1の重合体溶液(洗浄剤)50gに1時間浸漬させた後、窒素ブローを行い、蛍光X線法(テクノス社製、TREX630III、検出限界:5.0×1012個/cm2)により、シリコンウェハ上に残留するNa元素の分析を行った。検出不可能(検出下限以下)である場合を○として評価した。実施例2~7及び比較例1、2についても実施例1の洗浄剤と同様に操作した。結果を表1に示す。
鏡面研磨されたシリコンウェハ(6インチ)を3%水酸化ナトリウム、3%水酸化カリウム、3%水酸化鉄(III)、3%水酸化カルシウム、3%水酸化アルミニウムの混合液に3分間浸漬し、軽く水洗して汚染処理を行った。汚染処理したシリコンウェハ表面の各金属元素量を、気相分解-誘導結合プラズマ質量分析(VPD-ICPMS)法により測定した。次に、実施例1の重合体の2%水溶液を洗浄液として調整し、汚染処理したシリコンウェハを洗浄液中、25℃3分洗浄し、水洗・乾燥後、再びシリコンウェハ表面の金属元素量を測定した。実施例2~7及び比較例1~2の重合体についても実施例1と同様に操作した。また、参考例として、汚染処理したシリコンウェハを、上記洗浄液に替えて蒸留水を用いる以外は上記と同様に洗浄して乾燥した後、シリコンウェハ表面の金属元素量を測定した。結果を表2に示す。
Claims (14)
- スルホン酸基含有重合体を含む半導体部品用洗浄剤であって、
Na、Al、K、Ca及びFeからなる群より選択される少なくとも1種の金属の含有量が0.7ppm以下である、半導体部品用洗浄剤。 - 前記少なくとも1種の金属は、Naを含む、請求項1に記載の半導体部品洗浄剤。
- 前記少なくとも1種の金属は、さらに、Feを含む、請求項2に記載の半導体部品洗浄剤。
- 前記少なくとも1種の金属は、さらに、Caを含む、請求項3に記載の半導体部品洗浄剤。
- 前記少なくとも1種の金属は、さらに、Kを含む、請求項4に記載の半導体部品洗浄剤。
- 前記少なくとも1種の金属は、さらに、Alを含む、請求項5に記載の半導体部品洗浄剤。
- 前記スルホン酸基含有重合体は、2-アクリルアミド-2-メチルプロパンスルホン酸又はその塩に由来する構造単位を有する、請求項1~6のいずれかに記載の半導体部品用洗浄剤。
- 前記スルホン酸基含有重合体の全構造単位に対し、2-アクリルアミド-2-メチルプロパンスルホン酸又はその塩に由来する構造単位を、70質量%以上100質量%以下有する、請求項7に記載の半導体部品用洗浄剤。
- 前記スルホン酸基含有重合体の全構造単位に対し、カルボキシ基含有単量体に由来する構造単位を0質量%以上30質量%以下有する、請求項1~8のいずれかに記載の半導体部品用洗浄剤。
- 研磨処理後の半導体部品の洗浄剤である、請求項1~9のいずれかに記載の半導体部品洗浄剤。
- 請求項1~9のいずれかに記載の洗浄剤を用いて半導体部品を洗浄する工程、を備える、半導体部品の洗浄方法。
- 請求項1~9のいずれかに記載の洗浄剤を用いて研磨処理後の半導体部品を洗浄する工程、を備える、洗浄方法。
- 半導体部品の表面を、請求項1~9のいずれかに記載の洗浄剤により洗浄する洗浄工程を備える、半導体部品の製造方法。
- 研磨処理後の半導体部品の表面を、請求項1~9のいずれかに記載の洗浄剤により洗浄する洗浄工程を備える、半導体部品の製造方法。
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KR20210093300A (ko) | 2021-07-27 |
JPWO2020100593A1 (ja) | 2021-09-24 |
US20210403836A1 (en) | 2021-12-30 |
US11634670B2 (en) | 2023-04-25 |
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