WO2018135290A1 - 半導体基板洗浄剤 - Google Patents
半導体基板洗浄剤 Download PDFInfo
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- WO2018135290A1 WO2018135290A1 PCT/JP2017/047177 JP2017047177W WO2018135290A1 WO 2018135290 A1 WO2018135290 A1 WO 2018135290A1 JP 2017047177 W JP2017047177 W JP 2017047177W WO 2018135290 A1 WO2018135290 A1 WO 2018135290A1
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- semiconductor substrate
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- cleaning agent
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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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3707—Polyethers, e.g. polyalkyleneoxides
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/38—Cationic compounds
- C11D1/42—Amino alcohols or amino ethers
- C11D1/44—Ethers of polyoxyalkylenes with amino alcohols; Condensation products of epoxyalkanes with amines
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
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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
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
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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
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/08—Liquid soap, e.g. for dispensers; capsuled
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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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/26—Organic compounds containing nitrogen
- C11D3/30—Amines; Substituted amines ; Quaternized amines
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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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3942—Inorganic per-compounds
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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
- C11D7/26—Organic compounds containing oxygen
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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
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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
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
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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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
- H01L21/02074—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers the processing being a planarization of conductive layers
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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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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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
- 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 invention relates to a cleaning agent used for removing impurities such as metal polishing dust adhering to a semiconductor substrate.
- a multilayer wiring structure in which metal wirings are stacked in layers is formed on the surface of a semiconductor substrate.
- copper is deposited by plating on an insulating film provided with a recess having a wiring pattern shape, and then chemical mechanical polishing (CMP) or the like using an abrasive.
- CMP chemical mechanical polishing
- a damascene method is mainly employed in which copper deposited on portions other than the recesses is removed by flattening the surface.
- the semiconductor substrate after CMP is contaminated with impurities such as metal polishing scraps and abrasives, but the impurities cause a short circuit of the wiring and an increase in electric resistance, so it is necessary to remove them cleanly.
- an acidic cleaner for example, hydrofluoric acid
- an alkaline cleaner for example, an aqueous ammonia solution
- Patent Document 1 describes a cleaning agent containing an organic acid compound such as oxalic acid.
- Patent Document 2 describes a cleaning agent containing an amine.
- Patent Document 3 describes a detergent containing an aliphatic polycarboxylic acid such as oxalic acid or malonic acid and a polyhydric alcohol or a monoether form thereof.
- Patent Document 4 describes a cleaning agent containing an ethylene oxide type surfactant, water, and an organic acid or base. It is described that any cleaning agent can remove impurities without corroding the metal.
- the impurities peeled off by the cleaning agent are likely to be reattached to the semiconductor substrate, and even if the cleaning is performed using the cleaning agent, the effect of preventing the short circuit of the wiring and the increase of the electric resistance cannot be sufficiently obtained. there were.
- an object of the present invention is to provide a cleaning agent capable of removing impurities such as metal polishing scraps adhering to a semiconductor substrate and preventing re-adhesion of the impurities without corroding the metal.
- the present inventor removed impurities such as metal polishing dust adhering to the semiconductor substrate without corroding the metal forming the wiring and the like with the cleaning agent containing the following components. And it has been found that re-deposition of the removed impurities can be prevented.
- the present invention has been completed based on these findings.
- the present invention provides a semiconductor substrate cleaning agent containing at least the following component (A) and component (B).
- component (A) Water-soluble oligomer component having a weight average molecular weight of 100 or more and less than 10,000
- B Water
- the component (A) is represented by the compound represented by the following formula (a-1), the compound represented by the following formula (a-2), and the following formula (a-3).
- the semiconductor substrate cleaning agent is at least one compound selected from compounds.
- R a1 O- (C 3 H 6 O 2) n -H (a1) (In the formula, R a1 represents a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms which may have a hydroxyl group, or an acyl group having 2 to 24 carbon atoms.
- N represents glycerin shown in parentheses.
- R a2 represents a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or an acyl group having 2 to 24 carbon atoms
- R a3 represents an ethylene group or a propylene group.
- N ′ is in parentheses.
- the average degree of polymerization of the indicated ethylene oxide or propylene oxide unit is an integer of 2 to 60 (R a4 ) 3-s -N-[(R a5 O) n " -H] s (a-3)
- R a4 represents an alkyl group having 1 to 20 carbon atoms
- R a5 represents an ethylene group or a propylene group.
- N ′′ represents an average degree of polymerization of ethylene oxide or propylene oxide units shown in parentheses.
- s represents 1 or 2.
- s is 1, two R a4 s may be the same or different, and s is 2. In which case the groups in the two square brackets may be the same or different)
- the present invention also provides the semiconductor substrate cleaning agent, wherein the content of the component (A) is 0.1% by weight or more of the total amount of the semiconductor substrate cleaning agent.
- the present invention also provides the semiconductor substrate cleaner, wherein the chloride ion content is 0.01 to 50 ppm.
- the present invention also provides the semiconductor substrate cleaning agent comprising the following component (C).
- the present invention also provides the semiconductor substrate cleaning agent, wherein the component (C) is an alkanolamine represented by the following formula (c5). (Wherein R c1 ′ and R c2 ′ are the same or different and are a hydrogen atom or an aliphatic hydrocarbon group, and R c3 ′ is an aliphatic hydrocarbon group having a hydroxyl group)
- the present invention also provides the semiconductor substrate cleaning agent, wherein the content of the component (C) is 0.1 to 2.0 parts by weight with respect to 1 part by weight of the component (A).
- the present invention also provides the above semiconductor substrate cleaning agent, which contains 0.1 to 3.0 parts by weight of the following component (D) with respect to 1 part by weight of the component (A).
- component (D) Hydrogen peroxide
- the present invention also provides a method for manufacturing a semiconductor device, in which a semiconductor device having a multilayer wiring structure is manufactured by repeating the following steps.
- the semiconductor substrate cleaning agent of the present invention Since the semiconductor substrate cleaning agent of the present invention has the above-described configuration, impurities such as metal polishing dust attached to the semiconductor substrate can be removed without corroding the metal forming the wiring and the like, and the removed impurities Can be prevented from re-adhering. Therefore, if the semiconductor substrate cleaning agent of the present invention is used for cleaning, the impurities remaining on the semiconductor substrate can be suppressed or prevented extremely low. If the semiconductor substrate is cleaned using the semiconductor substrate cleaning agent of the present invention, it is possible to prevent a short circuit of wiring and an increase in electrical resistance, which have conventionally been caused by residual impurities, thereby reducing the yield. And a highly accurate semiconductor element can be efficiently manufactured.
- the semiconductor substrate cleaning agent of the present invention contains at least the following component (A) and component (B).
- the semiconductor substrate cleaning agent of the present invention can further contain at least one selected from the following component (C) and component (D).
- component (C) Amine component (D): Hydrogen peroxide
- Component (A) in the present invention is a water-soluble oligomer.
- the water-soluble oligomer has a weight average molecular weight of 100 or more and less than 10,000, preferably 300 to 8000, more preferably 500 to 6000.
- a water-soluble oligomer having a weight average molecular weight within the above range is particularly excellent in adhesion to the surface of a semiconductor substrate and exhibits an excellent effect in preventing reattachment of impurities.
- the weight average molecular weight in this specification is a molecular weight of standard polystyrene conversion measured by gel permeation chromatography (GPC).
- the solubility of the water-soluble oligomer is, for example, at least 1 g per 100 g of water.
- water-soluble oligomer examples include a compound represented by the following formula (a-1), a compound represented by the following formula (a-2), a compound represented by the following formula (a-3), and an alkylamine.
- examples thereof include lactic acid oligomers or derivatives thereof, (meth) acrylic acid oligomers or derivatives thereof, acrylamide oligomers or derivatives thereof, saponified vinyl acetate oligomers or derivatives thereof, and the like. These can be used individually by 1 type or in combination of 2 or more types.
- Examples of the water-soluble oligomer include a compound represented by the following formula (a-1), a compound represented by the following formula (a-2), and a compound represented by the following formula (a-3). At least one selected compound is preferred. This is because these compounds have a surface active action, improve the wettability of the cleaning agent, can efficiently remove impurities, and are further excellent in the effect of preventing reattachment of impurities.
- R a1 O— (C 3 H 6 O 2 ) n —H (a-1) In the formula, R a1 represents a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms which may have a hydroxyl group, or an acyl group having 2 to 24 carbon atoms.
- N represents glycerin shown in parentheses. Indicates the average degree of polymerization of the unit and is an integer of 2 to 60) R a2 O— (R a3 O) n ′ —H (a-2) (In the formula, R a2 represents a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or an acyl group having 2 to 24 carbon atoms, R a3 represents an ethylene group or a propylene group. N ′ is in parentheses.
- the average degree of polymerization of the indicated ethylene oxide or propylene oxide unit is an integer of 2 to 60) (R a4 ) 3-s -N-[(R a5 O) n " -H] s (a-3) (Wherein, R a4 represents an alkyl group having 1 to 20 carbon atoms, R a5 is .n which represents an ethylene or propylene group "represents an average degree of polymerization of ethylene oxide or propylene oxide units as shown in parentheses If an integer of 3 ⁇ 15 .s is .s showing a 1 or 2 is 1, the two R a4 may be the same or different. Further, s is 2 In which case the groups in the two square brackets may be the same or different)
- R a1 O— (C 3 H 6 O 2 ) n —H (a-1) (Glycerin wherein, R a1 represents a hydrogen atom, .n which a hydrocarbon group, or an acyl group having 2 to 24 carbon atoms of hydroxyl groups to 1 carbon atoms which may have a 18 shown in parentheses Indicates the average degree of polymerization of the unit and is an integer of 2 to 60)
- C 3 H 6 O 2 in parentheses in the formula (a-1) has a structure represented by the following formula (1) and / or (2).
- the hydrocarbon group having 1 to 18 carbon atoms includes an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, an alkapolyenyl group having 2 to 18 carbon atoms, and an aliphatic group having 3 to 18 carbon atoms. Examples thereof include a cyclic hydrocarbon group, an aromatic hydrocarbon group having 6 to 18 carbon atoms, and a group in which two or more thereof are linked.
- alkenyl group having 2 to 18 carbon atoms examples include linear or branched alkenyl groups such as vinyl, allyl, 2-butenyl, propenyl, hexenyl, 2-ethylhexenyl, and oleyl groups.
- alkapolyenyl group having 2 to 18 carbon atoms examples include alkadienyl groups such as butadienyl, pentadienyl, hexadienyl, heptadienyl, octadienyl, linoleyl and linolyl groups; alkatrienyl groups such as 1,2,3-pentatrienyl An alkatetraenyl group.
- Examples of the alicyclic hydrocarbon group having 3 to 18 carbon atoms include saturated or unsaturated alicyclic hydrocarbons such as cyclobutyl, cyclopentyl, cyclohexyl, cyclooctyl, cyclododecyl, 2-cycloheptenyl, and 2-cyclohexenyl groups. Groups (particularly cycloalkyl groups, cycloalkenyl groups).
- aromatic hydrocarbon group having 6 to 18 carbon atoms examples include phenyl and naphthyl groups.
- Examples of the group in which two or more of the groups are linked include, for example, benzyl, 2-phenylethenyl, 1-cyclopentylethyl, 1-cyclohexylethyl, cyclohexylmethyl, 2-cyclohexylethyl, 1-cyclohexyl-1-methylethyl group and the like Is mentioned.
- the acyl group having 2 to 24 carbon atoms includes an aliphatic acyl group and an aromatic acyl group.
- the aliphatic acyl group include saturated or unsaturated aliphatic acyl groups such as acetyl, propionyl, butyryl, isobutyryl, stearoyl, and oleoyl groups.
- the aromatic acyl group include benzoyl, toluoyl, and naphthoyl group.
- the R a among others, a hydrogen atom, a linear or branched alkyl group (especially a linear or branched alkyl group having 8 to 18 carbon atoms, especially straight-chain or branched carbon atoms 10-18 A linear alkyl group), a linear or branched alkenyl group (in particular, a linear or branched alkenyl group having 2 to 18 carbon atoms, particularly a linear or branched alkenyl group having 2 to 8 carbon atoms) Or an aliphatic acyl group (particularly a saturated aliphatic acyl group having 10 to 18 carbon atoms), and particularly preferably a hydrogen atom, the alkyl group, or the alkenyl group.
- a linear or branched alkyl group especially a linear or branched alkyl group having 8 to 18 carbon atoms, especially straight-chain or branched carbon atoms 10-18 A linear alkyl group
- a linear or branched alkenyl group in particular,
- n represents the average degree of polymerization of glycerin units shown in parentheses.
- the value of n is an integer of 2 to 60, and the lower limit of the value of n is preferably 5, more preferably 10, still more preferably 15, particularly preferably 20, most preferably 25, and particularly preferably 30.
- the upper limit of the value of n is preferably 55, more preferably 50, particularly preferably 45, and most preferably 40.
- a compound represented by the formula (a-1), wherein the value of n in the formula is within the above range easily adheres to the surface of the semiconductor substrate and forms a coating film, and once peeled from the surface of the semiconductor substrate by the coating film formation. It is possible to prevent the impurities from reattaching, and to suppress or prevent the impurities from remaining on the surface of the semiconductor substrate.
- the compound represented by the formula (a-1) has a weight average molecular weight of 100 or more and less than 10,000, preferably 300 to 8000, more preferably 500 to 6000, particularly preferably 1000 to 5000, and most preferably 2000 to 4000. is there.
- HO— (C 3 H 6 O 2 ) 10 H HO— (C 3 H 6 O 2 ) 20 —H HO— (C 3 H 6 O 2 ) 30 —H HO— (C 3 H 6 O 2 ) 40 —H CH 2 ⁇ CHCH 2 —O— (C 3 H 6 O 2 ) 6 —H C 12 H 25 O— (C 3 H 6 O 2 ) 4 —H C 12 H 25 O— (C 3 H 6 O 2 ) 10 —H C 18 H 37 O- (C 3 H 6 O 2) 4 -H C 18 H 37 O— (C 3 H 6 O 2 ) 10 —H
- polyglycerin that is, a compound in which R a1 is a hydrogen atom
- polyglycerin for example, trade name “PGL 03P” (poly (3) glycerin), “PGL 06” (poly (6) glycerin), “PGL 10PSW” (poly (10) glycerin), “PGL 20PW” (poly (20) glycerin), “PGL XPW” (poly (40) glycerin) (above, Commercially available products such as Daicel Co., Ltd. can be suitably used.
- polyglycerol derivative i.e., hydrocarbon group R a1 is ⁇ carbon atoms 1 which may have a hydroxyl group 18 in the formula, or carbon 2 ⁇
- Examples of the method for producing a polyglycerin derivative include the following methods, but the polyglycerin derivative in the present invention is not limited to those produced by the method.
- R a1 represents a hydrocarbon group having 1 to 18 carbon atoms, a carboxylic acid (for example, R a1 ′′ OH: R a1 ′′ represents an acyl group having 2 to 24 carbon atoms), or a derivative thereof ( For example, carboxylic acid halide, acid anhydride, etc.)
- the addition reaction is preferably performed in the presence of an alkali catalyst.
- the alkali catalyst include sodium hydroxide, potassium hydroxide, lithium hydroxide, metallic sodium, sodium hydride and the like. These can be used alone or in combination of two or more.
- the above-mentioned commercially available products can be suitably used.
- R a2 represents a hydrogen atom, a hydrocarbon group having 1 to 18 carbon atoms, or an acyl group having 2 to 24 carbon atoms
- R a3 represents an ethylene group or a propylene group.
- N ′ is in parentheses. The average degree of polymerization of the indicated ethylene oxide or propylene oxide unit is an integer of 2 to 60)
- Examples of the hydrocarbon group having 1 to 18 carbon atoms and the acyl group having 2 to 24 carbon atoms in R a2 in the formula (a-2) include the same examples as in the above R a1 .
- Examples of the hydrocarbon group having 1 to 18 carbon atoms in R a2 include a straight chain having 8 to 18 carbon atoms (particularly preferably 8 to 15 and most preferably 10 to 15) such as a lauryl group, a myristyl group, and a stearyl group.
- a linear or branched alkyl group having 8 to 20 carbon atoms (particularly preferably 8 to 15 and most preferably 10 to 15) such as an oleyl group is preferable.
- N ′ is preferably 6 to 12, particularly preferably 8 to 10.
- the weight average molecular weight of the compound represented by the formula (a-2) is 100 or more and less than 10,000, preferably 500 to 8000, more preferably 1000 to 7000, particularly preferably 2000 to 7000, and most preferably 3000 to 7000. is there.
- the weight average molecular weight of the compound represented by the formula (a-2) is preferably 100 or more and less than 1000, more preferably 100 to 800.
- Specific examples of the compound represented by the formula (a-2) include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, octanol, lauryl alcohol, 2-dodecanol, 1- Ethylene oxide adducts of saturated alcohols (primary or secondary alcohols) such as tridecanol, 2-tridecanol, myristyl alcohol, 2-tetradecanol, stearyl alcohol; unsaturated alcohols such as oleyl alcohol and linolyl alcohol (primary or Secondary alcohol) ethylene oxide adducts and the like.
- saturated alcohols primary or secondary alcohols
- unsaturated alcohols such as oleyl alcohol and linolyl alcohol (primary or Secondary alcohol) ethylene oxide adducts and the like.
- R a4 in the formula (a-3) represents an alkyl group having 1 to 20 carbon atoms.
- R a4 in the formula (a-3) represents an alkyl group having 1 to 20 carbon atoms.
- R a4 in the formula (a-3) represents an alkyl group having 1 to 20 carbon atoms.
- R a4 in the formula (a-3) represents an alkyl group having 1 to 20 carbon atoms.
- methyl, ethyl, n-propyl, 2-methyl-1-propyl, n-butyl, t-butyl, 3, 3-dimethyl-2-butyl, n-pentyl, isopentyl, t-amyl, n-hexyl, 2-ethylhexyl, n-octyl, isooctyl, n-decyl, 4-decyl, isodecyl, dodecyl ( n-lauryl), Examples thereof include
- Examples of the compound represented by the formula (a-3) include monoalkylamine ethylene such as butylamine, hexylamine, octylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, and coconutamine.
- Oxide adducts ethylene oxide adducts of dialkylamines such as propylmethylamine, butylmethylamine, diethylamine, propylethylamine, butylethylamine, dipropylamine, and butylpropylamine.
- the compound represented by the formula (a-3) has a weight average molecular weight of 100 or more and less than 10,000, preferably 500 to 8000, more preferably 1000 to 7000, particularly preferably 2000 to 7000, and most preferably 3000 to 7000. is there.
- the content of component (A) in the semiconductor substrate cleaning agent of the present invention (the total amount when containing two or more) is, for example, 0.1% by weight or more, preferably 0.1 to 5% by weight of the total amount of the semiconductor substrate cleaning agent. %, More preferably 0.1 to 3% by weight, particularly preferably 0.1 to 2% by weight, and most preferably 0.2 to 1% by weight.
- the semiconductor substrate cleaning agent of the present invention preferably contains at least a compound represented by formula (a-1) and / or a compound represented by formula (a-2) as component (A).
- the proportion of the content of the compound represented by formula (a-1) in the total amount of component (A) is, for example, 60% by weight or more, preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90%. % By weight or more.
- the content of the compound represented by the formula (a-1) is, for example, 0.1 wt% or more, preferably 0.1 to 5 wt%, more preferably 0.1 to 3 wt% of the total amount of the semiconductor substrate cleaning agent.
- % By weight, particularly preferably 0.1-2% by weight, most preferably 0.2-1% by weight.
- the compound represented by formula (a-2) in the total amount of component (A) contained in the semiconductor substrate cleaner of the present invention preferably a compound represented by formula (a-2) having a weight average molecular weight
- the proportion of the content of the compound of 1000 or more and less than 10,000 is, for example, 60% by weight or more, preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight. That's it.
- a compound represented by the formula (a-2) (preferably a compound represented by the formula (a-2) having a weight average molecular weight of 1000 or more and less than 10,000 (preferably 800 or more and less than 10,000) ) Is, for example, 0.1% by weight or more, preferably 0.1 to 5% by weight, more preferably 0.1 to 3% by weight, and particularly preferably 0.1 to 2% by weight of the total amount of the semiconductor substrate cleaning agent. %, Most preferably 0.2 to 1% by weight.
- the proportion of the total content of the compound represented by formula (a-1) and the compound represented by formula (a-2) in the total amount of component (A) contained in the semiconductor substrate cleaning agent of the present invention is, for example, 60 % By weight or more, preferably 70% by weight or more, particularly preferably 80% by weight or more, and most preferably 90% by weight or more.
- the total content of the compound represented by the formula (a-1) and the compound represented by the formula (a-2) is, for example, 0.1% by weight or more of the total amount of the semiconductor substrate cleaning agent, preferably 0.1%. To 5 wt%, more preferably 0.1 to 3 wt%, particularly preferably 0.1 to 2 wt%, and most preferably 0.2 to 1 wt%.
- the component (A) is a compound represented by the formula (a-1) and a compound represented by the formula (a-2), and has a weight average molecular weight of 100 or more and less than 1000 (preferably 100 To 800), the content of the compound represented by formula (a-2) having a weight average molecular weight of 100 or more and less than 1000 (preferably 100 to 800) is: For example, 0.01 to 0.50 parts by weight, preferably 0.05 to 0.5 parts by weight, and particularly preferably 0.05 to 0. 0 parts by weight with respect to 1 part by weight of the compound represented by the formula (a-1). 3 parts by weight.
- the content of the compound represented by the formula (a-2) having a weight average molecular weight of 100 or more and less than 1000 is, for example, 0.001 of the total amount of the semiconductor substrate cleaning agent. From 0.3 to 0.3% by weight, preferably from 0.001 to 0.2% by weight, particularly preferably from 0.001 to 0.1% by weight, and most preferably from 0.001 to 0.01% by weight.
- the semiconductor substrate cleaning agent of the present invention may contain a polyglycerol diether or a polyglycerol diester corresponding to the compound represented by the formula (a-1).
- the formula (a-1) The proportion of the content of the compound represented by formula (a-1) in the total content of the compound represented by formula (1), the corresponding polyglycerin diether, and the polyglycerin diester is 75% by weight or more. Preferably, it is 85% by weight or more, more preferably 90% by weight or more.
- the content of the polyglycerol diether or polyglycerol diester corresponding to the compound represented by the formula (a-1) is preferably 5% by weight or less of the total amount of the semiconductor substrate cleaning agent of the present invention, particularly preferably. 1% by weight or less.
- the content ratio of each component is obtained from the area ratio when each component is eluted by high performance liquid chromatography and the peak area is calculated by a differential refractive index detector.
- the semiconductor substrate cleaning agent of the present invention contains water as an essential component.
- water it is preferable to use water having a low electric conductivity (at 25 ° C.) in terms of excellent removal of impurities and prevention of re-deposition of the impurities. It is preferable to use water that is 0.2 ⁇ S / cm (preferably 0.056 to 0.1 ⁇ S / cm, particularly preferably 0.057 to 0.08 ⁇ S / cm), and it is particularly preferable to use ultrapure water. preferable.
- the electrical conductivity of water can be measured by a method based on JIS K0552.
- the water content in the semiconductor substrate cleaning agent of the present invention is, for example, 60.0 to 99.9% by weight, preferably 70.0 to 99.9% by weight, more preferably 85.0%, based on the total amount of the semiconductor substrate cleaning agent. To 99.9% by weight, particularly preferably 90.0 to 99.9% by weight.
- the semiconductor substrate cleaning agent of the present invention preferably contains one or more amines in terms of improving the removal efficiency of impurities (particularly abrasive grains contained in the abrasive).
- the amine is represented by the following formula (c), for example. (Wherein R c1 to R c3 are the same or different and each represents a hydrogen atom, a hydrocarbon group which may have a hydroxyl group or an amino group, or a group in which two or more of the groups are bonded via a linking group) And two or more groups selected from R c1 to R c3 may be bonded to each other to form a ring together with the nitrogen atom in the formula)
- the hydrocarbon group in R c1 to R c3 includes an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group in which two or more of these are linked.
- an alkyl group having 1 to 6 carbon atoms an alkenyl group having 2 to 6 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms or a cycloalkenyl group, and an aryl group having 6 to 10 carbon atoms are preferable.
- a substituent for example, an alkyl group having 1 to 3 carbon atoms
- linking group examples include —O—, —NH—, —NR c4 — (R c4 represents a hydrocarbon group, and examples similar to the hydrocarbon group in R c1 to R c3 can be given). Is mentioned.
- Examples of the ring that may be formed by combining two or more groups selected from R c1 to R c3 together with the nitrogen atom in the formula include a pyrrole ring, a pyrrolidine ring, a pyrazole ring, and an imidazole ring.
- 5-membered rings such as triazole ring; 6-membered rings such as isocyanuric ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrazine ring, piperidine ring and piperazine ring.
- the ring may be condensed with a ring selected from an alicyclic ring, an aromatic ring, an aromatic heterocyclic ring, and a non-aromatic attribute heterocyclic ring.
- the amine represented by formula (c) includes aliphatic amine (c1), alicyclic amine (c2), aromatic amine (c3), heterocyclic amine (c4), and alkanolamine (c5). It is.
- Examples of the aliphatic amine (c1) include monoalkylamines such as methylamine, ethylamine, propylamine, isopropylamine, hexylamine; dimethylamine, ethylmethylamine, propylmethylamine, butylmethylamine, diethylamine, propylethylamine Dialkylamines such as diisopropylamine; trialkylamines such as trimethylamine, ethyldimethylamine, diethylmethylamine, triethylamine, tri-n-propylamine, tri-n-butylamine; 2-diaminoethane, 1,2-propanediamine, 1, 3-propanediamine, 1,4-butanediamine, 1,6-diaminohexane, 1,2-bis (2-aminoethoxy) ethane, triethylenetetramine, tetraethylenepentamine, penta Chirenhekisamin, iminobispropylamine
- Examples of the alicyclic amine (c2) include isophorone diamine and 1,2-cyclohexane diamine.
- aromatic amine (c3) examples include aniline, 1,3-phenylenediamine, 2,4-tolylenediamine, 1,3-xylylenediamine, 1,5-naphthalenediamine, and 2,3-anthracenediamine. Aromatic amines and the like.
- heterocyclic amine (c4) examples include piperazine, N-aminoethylpiperazine, 1,4-diaminoethylpiperazine, 1,5-diazabicyclo [4,3,0] non-5-ene, 1,8. -Diazabicyclo [5,4,0] undec-7-ene and the like.
- alkanolamine (c5) examples include monoethanolamine, diethanolamine, triethanolamine, N, N-dimethyl-2-aminoethanol, N, N-diethyl-2-aminoethanol, and 2-amino-2-methyl.
- alkanolamine (c5) examples include 1-propanol, N- (aminoethyl) ethanolamine, 2- (2-aminoethylaminoethanol) and the like.
- an alkanolamine (c5) is preferable, and in particular, R c1 to R c3 in the formula (c) are the same or different and are each a hydrogen atom, a hydroxyl group or an amino group.
- An aliphatic hydrocarbon group (preferably a C 1-6 aliphatic hydrocarbon group) which may have a group, and at least one of R c1 to R c3 is an aliphatic hydrocarbon group having a hydroxyl group (Preferably a C 1-6 aliphatic hydrocarbon group) is preferable, and in particular, R c1 to R c3 in formula (c) are the same or different, and a hydrogen atom or an aliphatic hydrocarbon group (preferably, a C 1-6 aliphatic hydrocarbon group), at least one aliphatic hydrocarbon group having a hydroxyl group of R c1 ⁇ R c3 (preferably, C 1-6 aliphatic hydrocarbon group) Is preferred.
- the amine represented by the formula (c) is preferably an alkanolamine represented by the following formula (c5).
- R c1 ′ and R c2 ′ are the same or different and are a hydrogen atom or an aliphatic hydrocarbon group (preferably a C 1-6 aliphatic hydrocarbon group), and R c3 ′ represents a hydroxyl group.
- An aliphatic hydrocarbon group (preferably a C 1-6 aliphatic hydrocarbon group)
- the amine content is, for example, 0.2 to 2.0 parts by weight, preferably 0.3 to 1.5 parts by weight, particularly preferably 0.5 to 1. parts by weight per 1 part by weight of component (A). 2 parts by weight.
- the amine content is, for example, 0.2 to 2.0 parts by weight, preferably 0.3 to 1.5 parts by weight, particularly preferably, based on 1 part by weight of the compound represented by the formula (a-1). Is 0.5 to 1.2 parts by weight.
- the amine content is, for example, 5.0% by weight or less, preferably 0.01 to 1.0% by weight, particularly preferably 0.05 to 0.5% by weight, based on the total amount of the semiconductor substrate cleaning agent. .
- the amine content is such that the pH of the semiconductor substrate cleaning agent after addition of the amine is, for example, 5.0 to 12.0 (preferably 7.0 to 11.0, more preferably 8.5 to 10.5). ) Is preferable.
- the semiconductor substrate cleaning agent of the present invention contains an amine in the above range, it is preferable because impurities such as abrasive grains adhering to the semiconductor substrate can be more rapidly removed while preventing metal corrosion.
- the semiconductor substrate cleaning agent of the present invention preferably contains hydrogen peroxide in that it can further improve the removal efficiency of impurities (particularly metal polishing scraps).
- the content of hydrogen peroxide is, for example, 0.1 to 3.0 parts by weight, preferably 0.2 to 2.0 parts by weight, particularly preferably 0.3 to 2.0 parts by weight with respect to 1 part by weight of component (A). 1.5 parts by weight.
- the content of hydrogen peroxide is, for example, 0.1 to 3.0 parts by weight, preferably 0.2 to 2.0 parts by weight with respect to 1 part by weight of the compound represented by the formula (a-1). Particularly preferred is 0.3 to 1.5 parts by weight.
- the hydrogen peroxide content is, for example, 5.0% by weight or less, preferably 0.01 to 2.0% by weight, particularly preferably 0.05 to 1.0% by weight, based on the total amount of the semiconductor substrate cleaning agent. It is.
- the semiconductor substrate cleaning agent of the present invention contains hydrogen peroxide in the above range, it is possible to more rapidly remove impurities such as metal polishing dust attached to the semiconductor substrate while preventing metal corrosion.
- the content of hydrogen peroxide is excessive, it tends to be difficult to prevent metal corrosion.
- the semiconductor substrate cleaner of the present invention preferably has a chloride ion content of 0.01 to 50 ppm, for example, from the viewpoint of further improving the corrosion resistance of metals.
- the chloride ion content in the semiconductor substrate cleaner of the present invention can be adjusted, for example, by adding an aqueous hydrochloric acid solution.
- the semiconductor substrate cleaning agent of the present invention may further contain other components [for example, metal corrosion inhibitors (adenine, adenosine, thiazole, imidazole, etc.), polyphenol-based reducing agents (catechol, caffeic acid, alizarin, endo, as necessary. Crocin, urushiol, flavone, resorcinol, hydroquinone, emodin, pyrogallol, etc.), quaternary ammonium hydroxide (tetramethylammonium hydroxide, tetraethylammonium hydroxide, hydroxyethyltrimethylammonium hydroxide, etc.)] It can be contained above.
- metal corrosion inhibitors adenine, adenosine, thiazole, imidazole, etc.
- polyphenol-based reducing agents catechol, caffeic acid, alizarin, endo, as necessary. Crocin, urushiol, flavone, resorcino
- the semiconductor substrate cleaning agent of the present invention includes at least one selected from component (A) and component (B), if necessary, from other components (for example, component (C), component (D), hydrochloric acid, etc. ) Can be prepared by mixing.
- the proportion of the total content of the component (A), the component (B), the component (C), and the component (D) in the total amount (100% by weight) of the semiconductor substrate cleaning agent of the present invention is, for example, 70% by weight or more, Preferably it is 80 weight% or more, Especially preferably, it is 90 weight% or more, Most preferably, it is 95 weight% or more.
- the semiconductor substrate cleaning agent of the present invention contains at least component (A) and component (B), impurities such as metal polishing debris adhering to the semiconductor substrate can be removed, and the removed impurities are reattached. Can be prevented. Therefore, if the semiconductor substrate is cleaned using the semiconductor substrate cleaning agent of the present invention, the residual impurities can be suppressed or prevented very low. Furthermore, the semiconductor substrate cleaning agent of the present invention does not corrode metals. Therefore, it can be suitably used not only for cleaning a semiconductor substrate having no metal wiring but also for cleaning a semiconductor substrate having metal wiring.
- the method for manufacturing a semiconductor device of the present invention is characterized by manufacturing a semiconductor device having a multilayer wiring structure by repeating the following steps.
- Step (1) is a step of forming metal wiring (Cu wiring, Al wiring, etc.) on the semiconductor substrate via an interlayer insulating film.
- metal wiring There is no particular limitation on the method of forming the metal wiring, and metal coating is performed by RIE technology.
- Etching the film to form a wiring pattern, and forming an insulating film for example, a crystalline silicon film, an amorphous silicon film, a silicon oxide film (SiO 2 film), a silicon nitride film (SiN film) in the gap, Examples include a method of etching the insulating film to provide a recess having a wiring pattern shape, and embedding a metal in the resulting recess (damascene method), etc.
- a damascene method should be adopted. Is preferred.
- Step (2) is a step of flattening the metal wiring formation surface in the semiconductor substrate after the metal wiring is formed.
- CMP chemical mechanical polishing
- polishing is performed using an abrasive (slurry) containing abrasive grains such as alumina and silica, organic additives, and the like.
- the amount of abrasive used and the polishing rate can be adjusted as appropriate.
- the semiconductor substrate that has been subjected to the planarization process is cleaned with the semiconductor substrate cleaning agent of the present invention, so that the abrasive grains and abrasive grains contained in the abrasive material generated during the planarization process are used. It is a process of removing impurities such as.
- the semiconductor substrate cleaning agent of the present invention for example, the semiconductor substrate cleaning agent of the present invention is stored in a tank, and the semiconductor substrate after planarization treatment is immersed therein (for example, at room temperature for 1 to 15 minutes) And a method of spraying the semiconductor substrate cleaning agent of the present invention on the semiconductor substrate after the planarization treatment.
- physical cleaning such as ultrasonic cleaning, brush cleaning, jet cleaning, and the like can be performed together.
- the semiconductor substrate is cleaned using the semiconductor substrate cleaning agent of the present invention, and therefore, even if the semiconductor substrate is formed after the metal wiring is formed, the semiconductor substrate is not corroded. Impurities such as metal polishing scraps adhering to the metal can be removed, and the impurities once removed can be prevented from reattaching. Therefore, it is possible to prevent the impurities from remaining on the semiconductor substrate.
- the impurities do not remain on the semiconductor substrate.
- Comparative Examples 1-7 Each component was blended according to the formulation (unit: parts by weight) described in Table 2 to obtain a cleaning agent.
- the metal impurities removability of the cleaning agents obtained in Examples and Comparative Examples was evaluated by the following method.
- Metal impurity removal ability-1 was evaluated according to the following procedure.
- Silicon wafer having a silicon oxide single layer film (trade name “P-TEOS 1.5 ⁇ ”, manufactured by Advantech, thickness of silicon oxide single layer film: 1.5 ⁇ m) was cut into sections of length 1.0 cm ⁇ width 2.0 cm, immersed in a 10% aqueous acetic acid solution for 1 minute, and then washed with ultrapure water.
- the concentration of zinc, iron, and magnesium metal ions contained in the obtained measurement solution was measured using an ICP-MS analyzer (inductively coupled plasma mass spectrometer, Agilent Technologies, Inc., Agilent 7500cs type), and metal impurities Removability was determined according to the following criteria.
- ⁇ Evaluation criteria> ⁇ (very good): metal ion concentration is 1.5 ng / cm 2 or more ⁇ (good): metal ion concentration is 0.5 ng / cm 2 or more and less than 1.5 ng / cm 2 ⁇ (bad): metal ion concentration but less than 0.5ng / cm 2
- Metal impurity removal property-2 was evaluated by replacing a silicon wafer having a silicon oxide single layer film with a silicon bare wafer having a single crystal silicon single layer film (trade name “Bare Wafer”, manufactured by Advantech, single crystal silicon single layer). Evaluation was performed in the same manner as in ⁇ Metal Impurity Removability-1> except that the thickness of the film was 1.5 ⁇ m.
- a-1 Poly (40) glycerin, trade name “PGL XPW”, weight average molecular weight: 2981, manufactured by Daicel Corporation
- a-2 Polyethylene glycol, weight average molecular weight: 6000 a-3: Polyethylene glycol, weight average molecular weight: 4000 a-4: 9 mol of ethylene oxide adduct of lauryl alcohol, weight average molecular weight: 581 a-5: Hydroxyethyl cellulose, weight average molecular weight: 250,000 a-6: Polyvinylpyrrolidone, weight average molecular weight: 40,000 a-7: Polyethylene glycol, weight average molecular weight: 20,000 c-1: N, N-dimethyl-2-aminoethanol
- the semiconductor substrate cleaning agent of the present invention has both a metal corrosion prevention property and a metal impurity removal property. Therefore, the semiconductor substrate cleaning agent of the present invention can be suitably used not only for cleaning a semiconductor substrate having no metal wiring but also for cleaning a semiconductor substrate having metal wiring.
- the component (A) is at least selected from a compound represented by the formula (a-1), a compound represented by the formula (a-2), and a compound represented by the formula (a-3)
- the semiconductor substrate cleaning agent according to [1] which is a single compound.
- the semiconductor substrate cleaner according to [1] wherein the component (A) is a compound represented by the formula (a-1) and / or a compound represented by the formula (a-2).
- the semiconductor substrate cleaning agent according to any one of [1] to [3], wherein the content of the component (A) is 0.1% by weight or more of the total amount of the semiconductor substrate cleaning agent.
- the proportion of the compound represented by formula (a-1) in the total amount of component (A) is 60% by weight or more (preferably 70% by weight or more, particularly preferably 80% by weight or more, most preferably 90% by weight or more)
- the semiconductor substrate cleaning agent according to any one of [2] to [4].
- the content of the compound represented by the formula (a-1) is 0.1% by weight or more (preferably 0.1 to 5% by weight, more preferably 0.1 to 3% by weight of the total amount of the semiconductor substrate cleaning agent).
- the semiconductor substrate cleaning agent according to any one of [2] to [5], which is, by weight, particularly preferably 0.1 to 2% by weight, and most preferably 0.2 to 1% by weight.
- Compound represented by formula (a-2) in the total amount of component (A) preferably a compound represented by formula (a-2) having a weight average molecular weight of 1,000 or more and less than 10,000 (preferably [2] to [6], in which the proportion of the compound is from 60% by weight or more (preferably 70% by weight or more, particularly preferably 80% by weight or more, most preferably 90% by weight or more).
- the semiconductor substrate cleaning agent as described in any one of these.
- a compound represented by formula (a-2) (preferably a compound represented by formula (a-2) having a weight average molecular weight of 1,000 or more and less than 10,000 (preferably 800 or more and less than 10,000).
- the content of the compound is 0.1% by weight or more (preferably 0.1 to 5% by weight, more preferably 0.1 to 3% by weight, particularly preferably 0.1 to 2% by weight) of the total amount of the semiconductor substrate cleaning agent. %, Most preferably 0.2 to 1% by weight).
- the semiconductor substrate cleaner according to any one of [2] to [7].
- the proportion of the total content of the compound represented by formula (a-1) and the compound represented by formula (a-2) in the total amount of component (A) is 60% by weight or more (preferably 70% by weight)
- the total content of the compound represented by the formula (a-1) and the compound represented by the formula (a-2) is 0.1% by weight or more of the total amount of the semiconductor substrate cleaning agent (preferably 0.1% -5% by weight, more preferably 0.1-3% by weight, particularly preferably 0.1-2% by weight, most preferably 0.2-1% by weight), any of [2]-[9]
- the semiconductor substrate cleaning agent as described in any one.
- the component (A) is a compound represented by the formula (a-1) and a compound represented by the formula (a-2), and has a weight average molecular weight of 100 or more and less than 1000 (preferably 100 to 800) is a compound represented by formula (a-2) with respect to 1 part by weight of the compound represented by formula (a-1), and has a weight average molecular weight of 100 or more and less than 1000 ( Preferably, it is contained in a proportion of 0.01 to 0.50 parts by weight (preferably 0.05 to 0.5 parts by weight, particularly preferably 0.05 to 0.3 parts by weight).
- [2] to [10] The semiconductor substrate cleaner according to any one of [1] to [10].
- the compound represented by the formula (a-2) having a weight average molecular weight of 100 or more and less than 1000 (preferably 100 to 800) is 0.001 to 0.3 wt% (preferably 0.001 to 0.2 wt%, particularly preferably 0.001 to 0.1 wt%, most preferably 0.001 to 0.01 wt%), [2]
- Component (B) has an electric conductivity (at 25 ° C.) of 0.055 to 0.2 ⁇ S / cm (preferably 0.056 to 0.1 ⁇ S / cm, particularly preferably 0.057 to 0.08 ⁇ S).
- the semiconductor substrate cleaning agent of the present invention can remove impurities such as metal polishing debris adhering to the semiconductor substrate without corroding the metal forming the wiring, etc., and also prevents reattachment of the removed impurities. can do. Therefore, if the semiconductor substrate cleaning agent of the present invention is used for cleaning, the impurities remaining on the semiconductor substrate can be suppressed or prevented extremely low. If the semiconductor substrate is cleaned using the semiconductor substrate cleaning agent of the present invention, it is possible to prevent a short circuit of wiring and an increase in electrical resistance, which have conventionally been caused by residual impurities, thereby reducing the yield. And a highly accurate semiconductor element can be efficiently manufactured.
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Abstract
Description
成分(A):重量平均分子量が100以上10000未満の水溶性オリゴマー
成分(B):水
Ra1O-(C3H6O2)n-H (a-1)
(式中、Ra1は、水素原子、ヒドロキシル基を有していてもよい炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示す。nは括弧内に示されるグリセリン単位の平均重合度を示し、2~60の整数である)
Ra2O-(Ra3O)n'-H (a-2)
(式中、Ra2は、水素原子、炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示し、Ra3はエチレン基又はプロピレン基を示す。n’は括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、2~60の整数である)
(Ra4)3-s-N-[(Ra5O)n"-H]s (a-3)
(式中、Ra4は、炭素数1~20のアルキル基を示し、Ra5はエチレン基又はプロピレン基を示す。n”は丸括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、3~15の整数である。sは1又は2を示す。sが1である場合、2個のRa4は同一であってもよく、異なっていてもよい。また、sが2である場合、2個の角括弧内の基は、同一であってもよく、異なっていてもよい)
成分(C):アミン
成分(D):過酸化水素
工程(1):半導体基板上に層間絶縁膜を介して金属配線を形成する
工程(2):半導体基板における金属配線形成面に平坦化処理を施す
工程(3):平坦化処理が施された半導体基板を、前記半導体基板洗浄剤を用いて洗浄する
そして、本発明の半導体基板洗浄剤を使用して半導体基板を洗浄すれば、従来、前記不純物の残留によって引き起こされていた配線の短絡や電気抵抗の上昇を防止することができ、歩留まりの低下を防止し、高精度の半導体素子を効率よく製造することができる。
本発明の半導体基板洗浄剤は、下記成分(A)及び成分(B)を少なくとも含有する。
成分(A):重量平均分子量が100以上10000未満の水溶性オリゴマー
成分(B):水
成分(C):アミン
成分(D):過酸化水素
本発明における成分(A)は、水溶性オリゴマーである。前記水溶性オリゴマーの重量平均分子量は100以上10000未満であり、好ましくは300~8000、より好ましくは500~6000である。上記範囲の重量平均分子量を有する水溶性オリゴマーは、半導体基板表面への密着性に特に優れ、不純物の再付着防止に優れた効果を発揮する。尚、本明細書中の重量平均分子量は、ゲル・パーミエーション・クロマトグラフィー(GPC)により測定される標準ポリスチレン換算の分子量である。
Ra1O-(C3H6O2)n-H (a-1)
(式中、Ra1は、水素原子、ヒドロキシル基を有していてもよい炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示す。nは括弧内に示されるグリセリン単位の平均重合度を示し、2~60の整数である)
Ra2O-(Ra3O)n'-H (a-2)
(式中、Ra2は、水素原子、炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示し、Ra3はエチレン基又はプロピレン基を示す。n’は括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、2~60の整数である)
(Ra4)3-s-N-[(Ra5O)n"-H]s (a-3)
(式中、Ra4は、炭素数1~20のアルキル基を示し、Ra5はエチレン基又はプロピレン基を示す。n”は丸括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、3~15の整数である。sは1又は2を示す。sが1である場合、2個のRa4は同一であってもよく、異なっていてもよい。また、sが2である場合、2個の角括弧内の基は、同一であってもよく、異なっていてもよい)
Ra1O-(C3H6O2)n-H (a-1)
(式中、Ra1は、水素原子、ヒドロキシル基を有していてもよい炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示す。nは括弧内に示されるグリセリン単位の平均重合度を示し、2~60の整数である)
-CH2-CHOH-CH2O- (1)
-CH(CH2OH)CH2O- (2)
HO-(C3H6O2)10-H
HO-(C3H6O2)20-H
HO-(C3H6O2)30-H
HO-(C3H6O2)40-H
CH2=CHCH2-O-(C3H6O2)6-H
C12H25O-(C3H6O2)4-H
C12H25O-(C3H6O2)10-H
C18H37O-(C3H6O2)4-H
C18H37O-(C3H6O2)10-H
(1)Ra1OH(Ra1は前記に同じ)に2,3-エポキシ-1-プロパノールを付加重合する方法
(2)ポリグリセリンに、アルキルハライド(例えば、Ra1'X:Xはハロゲン原子を示す。Ra1'は炭素数1~18の炭化水素基を示す)、カルボン酸(例えば、Ra1"OH:Ra1"は炭素数2~24のアシル基を示す)、又はその誘導体(例えば、カルボン酸ハライド、酸無水物等)を縮合させる方法
Ra2O-(Ra3O)n'-H (a-2)
(式中、Ra2は、水素原子、炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示し、Ra3はエチレン基又はプロピレン基を示す。n’は括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、2~60の整数である)
(Ra4)3-s-N-[(Ra5O)n"-H]s (a-3)
(式中、Ra4は、炭素数1~20のアルキル基を示し、Ra5はエチレン基又はプロピレン基を示す。n”は丸括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、3~15の整数である。sは1又は2を示す。sが1である場合、2個のRa4は同一であってもよく、異なっていてもよい。また、sが2である場合、2個の角括弧内の基は、同一であってもよく、異なっていてもよい)
本発明の半導体基板洗浄剤は水を必須成分とする。水としては、不純物の除去性、及び前記不純物の再付着防止性に優れる点で、電気伝導率(25℃における)が小さい水を使用することが好ましく、電気伝導率が、例えば0.055~0.2μS/cm(好ましくは0.056~0.1μS/cm、特に好ましくは0.057~0.08μS/cm)である水を使用することが好ましく、特に超純水を使用することが好ましい。尚、水の電気伝導率は、JIS K0552に準拠した方法で測定できる。
本発明の半導体基板洗浄剤は、不純物(特に、研磨材に含まれる砥粒等)の除去効率を向上することができる点で、アミンを1種又は2種以上含有することが好ましい。前記アミンは、例えば、下記式(c)で表される。
本発明の半導体基板洗浄剤は、不純物(特に、金属研磨屑)の除去効率を更に向上することができる点で、過酸化水素を含有することが好ましい。
本発明の半導体基板洗浄剤は、塩化物イオン含有量が例えば0.01~50ppmであることが、金属の腐食防止性を一層向上する効果が得られる点で好ましい。
本発明の半導体基板洗浄剤は、成分(A)、成分(B)に、必要に応じて他の成分(例えば、上記成分(C)、成分(D)、塩酸等から選択される少なくとも1種)を混合することにより調製することができる。
本発明の半導体素子の製造方法は、下記工程を繰り返すことにより多層配線構造を有する半導体素子を製造することを特徴とする。
工程(1):半導体基板上に層間絶縁膜を介して金属配線を形成する
工程(2):半導体基板における金属配線形成面に平坦化処理を施す
工程(3):平坦化処理が施された半導体基板を、本発明の半導体基板洗浄剤を用いて洗浄する
表1に記載の処方(単位:重量部)に従って各成分を配合して洗浄剤を得た。得られた洗浄剤は、金属配線を腐食するものではなかった。
表2に記載の処方(単位:重量部)に従って各成分を配合して洗浄剤を得た。
金属不純物除去性-1の評価は、以下に示す手順によりおこなった。
(1)酸化シリコン単層膜を有するウェハの前処理
酸化シリコン単層膜を有するシリコンウェハ(商品名「P-TEOS1.5μ」、アドバンテック社製、酸化シリコン単層膜の厚み:1.5μm)を、縦1.0cm×横2.0cmの切片に切断し、10%酢酸水溶液に1分間浸漬した後、超純水で洗浄した。
(2)金属イオンを含有する水溶液の調製
硝酸亜鉛0.1g、硝酸鉄0.1g、及び硝酸マグネシウム0.1gに、全量が100gになるように水を加え、亜鉛、鉄、マグネシウムの金属イオンをそれぞれ0.1%含有する金属イオン水溶液を調製した。
(3)金属イオン水溶液によるウェハの汚染処理
(1)において前処理されたウェハ切片を、(2)において調製された金属イオン水溶液10gに1分間浸漬した後、窒素ブローで乾燥させることにより、ウェハ表面に金属イオンを付着させた。
(4)ウェハの洗浄
汚染処理されたウェハ切片を、実施例及び比較例で得られた各洗浄剤10gに浸漬し、25℃で3分間静置した後、洗浄剤から取り出した。
(5)洗浄剤中に溶出した金属イオン濃度の測定
ウェハ洗浄終了後、ウェハを取り出した洗浄剤5gに0.1%硝酸水溶液を添加してpHを3.0に調整した。その後、全量が10gになるまで超純水を加えたものを測定液とした。
得られた測定液中に含有する亜鉛、鉄、及びマグネシウム金属イオンの濃度を、ICP-MS分析装置(誘導結合プラズマ質量分析装置、アジレントテクノロジー社製、Agilent7500cs型)を用いて測定し、金属不純物除去性を下記基準で判定した。
<評価基準>
○(非常に良好):金属イオン濃度が1.5ng/cm2以上
△(良好):金属イオン濃度が0.5ng/cm2以上、1.5ng/cm2未満
×(不良):金属イオン濃度が0.5ng/cm2未満
金属不純物除去性-2の評価は、酸化シリコン単層膜を有するシリコンウェハに代えて、単結晶シリコン単層膜を有するシリコンベアウェハ(商品名「ベアウェハ」、アドバンテック社製、単結晶シリコン単層膜の厚み:1.5μm)を使用した以外は、<金属不純物除去性-1>と同様の方法で評価した。
a-1:ポリ(40)グリセリン、商品名「PGL XPW」、重量平均分子量:2981、(株)ダイセル製
a-2:ポリエチレングリコール、重量平均分子量:6000
a-3:ポリエチレングリコール、重量平均分子量:4000
a-4:ラウリルアルコールのエチレンオキサイド9モル付加物、重量平均分子量:581
a-5:ヒドロキシエチルセルロース、重量平均分子量:25万
a-6:ポリビニルピロリドン、重量平均分子量:4万
a-7:ポリエチレングリコール、重量平均分子量:2万
c-1:N,N-ジメチル-2-アミノエタノール
[1] 下記成分(A)及び成分(B)を少なくとも含有する半導体基板洗浄剤。
成分(A):重量平均分子量が100以上10000未満の水溶性オリゴマー
成分(B):水
[2] 成分(A)が、式(a-1)で表される化合物、式(a-2)で表される化合物、及び式(a-3)で表される化合物から選択される少なくとも1種の化合物である、[1]に記載の半導体基板洗浄剤。
[3] 成分(A)が、式(a-1)で表される化合物及び/又は式(a-2)で表される化合物である、[1]に記載の半導体基板洗浄剤。
[4] 成分(A)の含有量が、半導体基板洗浄剤全量の0.1重量%以上である、[1]~[3]の何れか1つに記載の半導体基板洗浄剤。
[5] 成分(A)全量における式(a-1)で表される化合物の含有量の占める割合が60重量%以上(好ましくは70重量%以上、特に好ましくは80重量%以上、最も好ましくは90重量%以上)である、[2]~[4]の何れか1つに記載の半導体基板洗浄剤。
[6] 式(a-1)で表される化合物の含有量が、半導体基板洗浄剤全量の0.1重量%以上(好ましくは0.1~5重量%、より好ましくは0.1~3重量%、特に好ましくは0.1~2重量%、最も好ましくは0.2~1重量%)である、[2]~[5]の何れか1つに記載の半導体基板洗浄剤。
[7] 成分(A)全量における式(a-2)で表される化合物(好ましくは、式(a-2)で表される化合物であって、重量平均分子量が1000以上10000未満(好ましくは800以上10000未満)の化合物)の占める割合が60重量%以上(好ましくは70重量%以上、特に好ましくは80重量%以上、最も好ましくは90重量%以上)である、[2]~[6]の何れか1つに記載の半導体基板洗浄剤。
[8] 式(a-2)で表される化合物(好ましくは、式(a-2)で表される化合物であって、重量平均分子量が1000以上10000未満(好ましくは800以上10000未満)の化合物)の含有量が、半導体基板洗浄剤全量の0.1重量%以上(好ましくは0.1~5重量%、より好ましくは0.1~3重量%、特に好ましくは0.1~2重量%、最も好ましくは0.2~1重量%)である、[2]~[7]の何れか1つに記載の半導体基板洗浄剤。
[9] 成分(A)全量における式(a-1)で表される化合物と式(a-2)で表される化合物の合計含有量の占める割合が60重量%以上(好ましくは70重量%以上、特に好ましくは80重量%以上、最も好ましくは90重量%以上)である、[2]~[8]の何れか1つに記載の半導体基板洗浄剤。
[10] 式(a-1)で表される化合物と式(a-2)で表される化合物の合計含有量が、半導体基板洗浄剤全量の0.1重量%以上(好ましくは0.1~5重量%、より好ましくは0.1~3重量%、特に好ましくは0.1~2重量%、最も好ましくは0.2~1重量%)である、[2]~[9]の何れか1つに記載の半導体基板洗浄剤。
[11] 成分(A)として、式(a-1)で表される化合物と、式(a-2)で表される化合物であって、重量平均分子量が100以上1000未満(好ましくは100~800)である化合物とを、式(a-1)で表される化合物1重量部に対して、式(a-2)で表される化合物であって、重量平均分子量が100以上1000未満(好ましくは100~800)である化合物を0.01~0.50重量部(好ましくは0.05~0.5重量部、特に好ましくは0.05~0.3重量部)の割合で含有する、[2]~[10]の何れか1つに記載の半導体基板洗浄剤。
[12] 式(a-2)で表される化合物であって、重量平均分子量が100以上1000未満(好ましくは100~800)の化合物の含有量が、半導体基板洗浄剤全量の0.001~0.3重量%(好ましくは0.001~0.2重量%、特に好ましくは0.001~0.1重量%、最も好ましくは0.001~0.01重量%)である、[2]~[11]の何れか1つに記載の半導体基板洗浄剤。
[13] 成分(B)が、電気伝導率(25℃における)が0.055~0.2μS/cm(好ましくは0.056~0.1μS/cm、特に好ましくは0.057~0.08μS/cm)の水である、[1]~[12]の何れか1つに記載の半導体基板洗浄剤。
[14] 塩化物イオン含有量が0.01~50ppmである、[1]~[13]の何れか1つに記載の半導体基板洗浄剤。
[15] 下記成分(C)を含有する、[1]~[14]の何れか1つに記載の半導体基板洗浄剤。
成分(C):アミン
[16] 成分(C)が、式(c5)で表されるアルカノールアミンである、[15]に記載の半導体基板洗浄剤。
[17] 成分(C)の含有量が、成分(A)1重量部に対して0.1~2.0重量部である、[15]又は[16]に記載の半導体基板洗浄剤。
[18] 下記成分(D)を、成分(A)1重量部に対して0.1~3.0重量部含有する、[1]~[17]の何れか1つに記載の半導体基板洗浄剤。
成分(D):過酸化水素
[19] 下記工程を繰り返すことにより多層配線構造を有する半導体素子を製造する、半導体素子の製造方法。
工程(1):半導体基板上に層間絶縁膜を介して金属配線を形成する
工程(2):半導体基板における金属配線形成面に平坦化処理を施す
工程(3):平坦化処理が施された半導体基板を、[1]~[18]の何れか1つに記載の半導体基板洗浄剤を用いて洗浄する
そして、本発明の半導体基板洗浄剤を使用して半導体基板を洗浄すれば、従来、前記不純物の残留によって引き起こされていた配線の短絡や電気抵抗の上昇を防止することができ、歩留まりの低下を防止し、高精度の半導体素子を効率よく製造することができる。
Claims (9)
- 下記成分(A)及び成分(B)を少なくとも含有する半導体基板洗浄剤。
成分(A):重量平均分子量が100以上10000未満の水溶性オリゴマー
成分(B):水 - 成分(A)が、下記式(a-1)で表される化合物、下記式(a-2)で表される化合物、及び下記式(a-3)で表される化合物から選択される少なくとも1種の化合物である、請求項1に記載の半導体基板洗浄剤。
Ra1O-(C3H6O2)n-H (a-1)
(式中、Ra1は、水素原子、ヒドロキシル基を有していてもよい炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示す。nは括弧内に示されるグリセリン単位の平均重合度を示し、2~60の整数である)
Ra2O-(Ra3O)n'-H (a-2)
(式中、Ra2は、水素原子、炭素数1~18の炭化水素基、又は炭素数2~24のアシル基を示し、Ra3はエチレン基又はプロピレン基を示す。n’は括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、2~60の整数である)
(Ra4)3-s-N-[(Ra5O)n"-H]s (a-3)
(式中、Ra4は、炭素数1~20のアルキル基を示し、Ra5はエチレン基又はプロピレン基を示す。n”は丸括弧内に示されるエチレンオキシド又はプロピレンオキシド単位の平均重合度を示し、3~15の整数である。sは1又は2を示す。sが1である場合、2個のRa4は同一であってもよく、異なっていてもよい。また、sが2である場合、2個の角括弧内の基は、同一であってもよく、異なっていてもよい) - 成分(A)の含有量が、半導体基板洗浄剤全量の0.1重量%以上である、請求項1又は2に記載の半導体基板洗浄剤。
- 塩化物イオン含有量が0.01~50ppmである、請求項1~3の何れか1項に記載の半導体基板洗浄剤。
- 下記成分(C)を含有する、請求項1~4の何れか1項に記載の半導体基板洗浄剤。
成分(C):アミン - 成分(C)の含有量が、成分(A)1重量部に対して0.1~2.0重量部である、請求項5又は6に記載の半導体基板洗浄剤。
- 下記成分(D)を、成分(A)1重量部に対して0.1~3.0重量部含有する、請求項1~7の何れか1項に記載の半導体基板洗浄剤。
成分(D):過酸化水素 - 下記工程を繰り返すことにより多層配線構造を有する半導体素子を製造する、半導体素子の製造方法。
工程(1):半導体基板上に層間絶縁膜を介して金属配線を形成する
工程(2):半導体基板における金属配線形成面に平坦化処理を施す
工程(3):平坦化処理が施された半導体基板を、請求項1~8の何れか1項に記載の半導体基板洗浄剤を用いて洗浄する
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| CN111742262B (zh) * | 2018-02-22 | 2024-11-26 | 株式会社大赛璐 | 基板亲水化处理剂 |
| US12152167B2 (en) | 2019-03-22 | 2024-11-26 | Daicel Corporation | Polishing composition for semiconductor wiring |
| WO2021054009A1 (ja) * | 2019-09-18 | 2021-03-25 | 富士フイルムエレクトロニクスマテリアルズ株式会社 | 洗浄方法 |
| WO2024260813A1 (en) * | 2023-06-20 | 2024-12-26 | Basf Se | Alkaline composition, its use and a process for cleaning substrates comprising cobalt and copper |
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Also Published As
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| US11279905B2 (en) | 2022-03-22 |
| TW201831664A (zh) | 2018-09-01 |
| JPWO2018135290A1 (ja) | 2019-11-07 |
| US20210130749A1 (en) | 2021-05-06 |
| KR102434647B1 (ko) | 2022-08-22 |
| JP7122258B2 (ja) | 2022-08-19 |
| CN110178204A (zh) | 2019-08-27 |
| CN110178204B (zh) | 2022-11-04 |
| TWI757405B (zh) | 2022-03-11 |
| KR20190103208A (ko) | 2019-09-04 |
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