WO2022025090A1 - ヒダントイン化合物の反応生成物を含むレジスト下層膜形成組成物 - Google Patents
ヒダントイン化合物の反応生成物を含むレジスト下層膜形成組成物 Download PDFInfo
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- WO2022025090A1 WO2022025090A1 PCT/JP2021/027814 JP2021027814W WO2022025090A1 WO 2022025090 A1 WO2022025090 A1 WO 2022025090A1 JP 2021027814 W JP2021027814 W JP 2021027814W WO 2022025090 A1 WO2022025090 A1 WO 2022025090A1
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- underlayer film
- resist underlayer
- resist
- forming composition
- Prior art date
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- 0 CCCC(C)(C)N(C(C(CC)(CC)*(N1CC(CN(C(N(CC=C)C2=*(C)C(CC(C)(CC)CC)CN22)=O)*2=O)O)=O)=O)C1=O Chemical compound CCCC(C)(C)N(C(C(CC)(CC)*(N1CC(CN(C(N(CC=C)C2=*(C)C(CC(C)(CC)CC)CN22)=O)*2=O)O)=O)=O)C1=O 0.000 description 1
- YBDXNVJXLRGJBH-UHFFFAOYSA-N CCCC(C)(CC)N(C(C(N1CC(CN(C(C)(C)C(N2CC(CC(C)(CCC)OC(c(cc3)ccc3S(C)(=O)=O)=O)O)=O)C2=O)O)=O)c2ccccc2)C1=O Chemical compound CCCC(C)(CC)N(C(C(N1CC(CN(C(C)(C)C(N2CC(CC(C)(CCC)OC(c(cc3)ccc3S(C)(=O)=O)=O)O)=O)C2=O)O)=O)c2ccccc2)C1=O YBDXNVJXLRGJBH-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- G—PHYSICS
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0395—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having a backbone with alicyclic moieties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0605—Polycondensates containing five-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0616—Polycondensates containing five-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only two nitrogen atoms in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0622—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0633—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only two nitrogen atoms in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0666—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0677—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only two nitrogen atoms in the ring
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
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- G—PHYSICS
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- G—PHYSICS
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- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
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- G—PHYSICS
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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Definitions
- the present invention relates to a composition used in a lithography process in semiconductor manufacturing, particularly in a state-of-the-art (ArF, EUV, EB, etc.) lithography process.
- the present invention also relates to a method for manufacturing a substrate with a resist pattern to which the resist underlayer film is applied, and a method for manufacturing a semiconductor device.
- a thin film of a photoresist composition is formed on a semiconductor substrate such as a silicon wafer, and an active light beam such as ultraviolet rays is irradiated through a mask pattern on which a pattern of a device is drawn to develop the film.
- an active light beam such as ultraviolet rays
- This is a processing method for forming fine irregularities corresponding to the pattern on the surface of the substrate by etching the substrate using the obtained photoresist pattern as a protective film.
- Patent Document 1 discloses a resist underlayer film forming composition containing a compound having a hydantoin ring.
- Patent Document 2 discloses a resist underlayer film forming composition for EUV sography, which comprises a polymer obtained by condensing an isocyanuric acid-containing compound and barbital.
- Patent Document 3 discloses a resist underlayer film forming composition for lithography having a structure containing a sulfonyl group at the end of a polymer chain.
- the characteristics required for the resist underlayer film are, for example, that intermixing with the resist film formed on the upper layer does not occur (it is insoluble in the resist solvent) and that the dry etching rate is faster than that of the resist film. Can be mentioned.
- the line width of the formed resist pattern is 32 nm or less, and the resist underlayer film for EUV exposure is used with a thinner film thickness than before.
- pinholes, agglomeration, etc. are likely to occur due to the influence of the substrate surface, the polymer used, and the like, and it is difficult to form a uniform film without defects.
- LWR Line Width Roughness, line width fluctuation (roughness)
- An object of the present invention is to provide a composition for forming a resist underlayer film capable of forming a desired resist pattern, which solves the above problems, and a resist pattern forming method using the resist underlayer film forming composition. ..
- the present invention includes the following.
- T 1 , T 2 , T 3 and T 4 may be independently interrupted by a hydrogen atom, an oxygen atom or a sulfur atom, respectively. It represents an alkyl group having 1 to 10 carbon atoms which may be substituted with, an aryl group having 6 to 40 carbon atoms which may be substituted with a hydroxy group, or an alkenyl group having 3 to 6 carbon atoms.
- R 1 represents an alkyl group, a phenyl group, a pyridyl group, a halogeno group or a hydroxy group having 1 to 6 carbon atoms which may have a substituent
- R 3 represents a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, a hydroxy group or a halogeno group
- R 4 represents a direct bond or a divalent group having 1 to 8 carbon atoms.
- R5 represents an organic group
- R5 represents a divalent organic group having 1 to 8 carbon atoms
- A represents an aromatic ring or an aromatic heterocycle
- t represents 0 or 1
- u represents 1 or 2.
- a resist underlayer film which is a fired product of a coating film comprising the resist underlayer film forming composition according to any one of [1] to [10].
- a patterned substrate including a step of applying and baking to form a resist film, a step of exposing the resist underlayer film and a semiconductor substrate coated with the resist, and a step of developing and patterning the resist film after exposure. Manufacturing method.
- a step of forming a resist underlayer film composed of the resist underlayer film forming composition according to any one of [1] to [10] on a semiconductor substrate The step of forming a resist film on the resist underlayer film and The process of forming a resist pattern by irradiating the resist film with light or electron beam and subsequent development, A step of forming a patterned resist underlayer film by etching the resist underlayer film through the formed resist pattern, and a step of forming the resist underlayer film.
- a resist pattern is formed using a resist underlayer film forming composition containing a reaction product of the above-mentioned (A) hydantoin-containing compound having two epoxy groups and (B) (A) a different hydantoin-containing compound.
- the limit resolution size at which the resist pattern does not collapse after development is smaller than that of the conventional resist underlayer film, and a finer resist pattern can be formed.
- the range of the resist pattern size showing a good pattern is increased as compared with the prior art.
- the resist underlayer film forming composition of the present application contains (A) a reaction product of a hydantoin-containing compound having two epoxy groups, (B) and a hydantoin-containing compound different from (A), and an organic solvent. It is preferable that the reaction product is a reaction product of (B) a secondary amino group contained in a hydantoin-containing compound and (A) an epoxy group contained in a hydantoin-containing compound. This reaction can be carried out by a known method.
- the compound (A) is of the formula (A-1), and the compound (B) is of the formula (B-1) :.
- T 1 , T 2 , T 3 and T 4 may be independently interrupted by a hydrogen atom, an oxygen atom or a sulfur atom, respectively. It represents an alkyl group having 1 to 10 carbon atoms which may be substituted with, an aryl group having 6 to 40 carbon atoms which may be substituted with a hydroxy group, or an alkenyl group having 3 to 6 carbon atoms.
- T 1 , T 2 , T 3 and T 4 may all be the same, all may be different, or some may be the same.
- T 1 , T 2 , T 3 and T 4 are preferably an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 40 carbon atoms.
- alkyl group having 1 to 10 carbon atoms examples include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a cyclopropyl group, an n-butyl group, an i-butyl group, an s-butyl group, and t-.
- Examples of the aryl group having 6 to 40 carbon atoms include a phenyl group, an o-methylphenyl group, an m-methylphenyl group, a p-methylphenyl group, an o-chlorphenyl group, an m-chlorphenyl group and a p-chlorphenyl group.
- alkenyl group having 3 to 6 carbon atoms examples include 1-propenyl group, 2-propenyl group, 1-methyl-1-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group and 2-methyl.
- Preferred specific examples of the above compound (A) include the following compounds.
- Preferred specific examples of the compound (B) include the following compounds.
- Examples of the organic solvent contained in the resist underlayer film forming composition of the present invention include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, and propylene glycol.
- propylene glycol monomethyl ether propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, cyclohexanone and the like are preferable.
- propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate are preferable.
- the weight average molecular weight of the reaction product is preferably 500 to 50,000, more preferably 1,000 to 30,000.
- the weight average molecular weight can be measured, for example, by the gel permeation chromatography method described in Examples.
- the end of the reaction product is sealed with a compound having a functional group.
- the functional group is preferably selected from a carboxy group, a hydroxy group, an amino group, an imino group and a thiol group.
- the compound having a functional group contains an aliphatic ring in which the carbon-carbon bond may be interrupted by a heteroatom and may be substituted with a substituent.
- the aliphatic ring is a monocyclic or polycyclic aliphatic ring having 3 to 10 carbon atoms.
- the polycyclic aliphatic ring is preferably a bicyclo ring or a tricyclo ring.
- the aliphatic ring has at least one unsaturated bond.
- carboxy group-containing compound containing an aliphatic ring in which the carbon-carbon bond may be interrupted with a hetero atom and may be substituted with a substituent shall be in accordance with the contents described in PCT / JP2020 / 0184436.
- the end of the reaction product of the compound (A) and the compound (B) is sealed with an aliphatic ring in which the carbon-carbon bond may be interrupted with a heteroatom and may be substituted with a substituent.
- the structure may be such that the reaction product of the compound (A) and the compound (B) and the carbon-carbon bond described below are interrupted by a heteroatom and substituted with a substituent. It can be produced by reacting with a carboxy group-containing compound containing an aliphatic ring.
- carboxy group-containing compound containing an aliphatic ring in which the carbon-carbon bond may be interrupted by a heteroatom and may be substituted with a substituent include the compounds described below. Specific examples include compounds in which the carboxy group of the following specific example is replaced with a hydroxy group, an amino group and a thiol group.
- R 1 represents an alkyl group, a phenyl group, a pyridyl group, a halogeno group or a hydroxy group having 1 to 6 carbon atoms which may have a substituent
- R 3 represents a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, a hydroxy group or a halogeno group
- R 4 represents a direct bond or a divalent group having 1 to 8 carbon atoms.
- R5 represents an organic group
- R5 represents a divalent organic group having 1 to 8 carbon atoms
- A represents an aromatic ring or an aromatic heterocycle
- t represents 0 or 1
- u represents 1 or 2. It is preferably represented by.).
- the reaction product terminal structure of the compound (A) and the compound (B) represented by the formulas (1) and (2) is the reaction product of the compound (A) and the compound (B).
- a compound represented by the following formula for example, a compound represented by the following formula can be mentioned.
- Specific examples include compounds in which the carboxy group of the following specific example is replaced with a hydroxy group, an amino group or a thiol group.
- Examples of the compound containing the imino group include the following compounds.
- thermoacid generator As the acid generator contained as an optional component in the resist underlayer film forming composition of the present invention, either a thermal acid generator or a photoacid generator can be used, but it is preferable to use a thermal acid generator.
- thermoacid generator include p-toluene sulfonic acid, trifluoromethanesulfonic acid, pyridinium-p-toluenesulfonate (pyridinium-p-toluenesulfonic acid), and pyridinium-p-hydroxybenzenesulfonic acid (p-phenolsulfonic acid).
- Pyridinium salt Pyridinium salt
- pyridinium-trifluoromethanesulfonic acid salicylic acid, camphorsulfonic acid, 5-sulfosalicylic acid, 4-chlorobenzenesulfonic acid, 4-hydroxybenzenesulfonic acid, benzenedisulfonic acid, 1-naphthalenesulfonic acid, citric acid, benzoic acid , Sulfonic acid compounds such as hydroxybenzoic acid and carboxylic acid compounds.
- the photoacid generator include onium salt compounds, sulfoneimide compounds, disulfonyldiazomethane compounds and the like.
- onium salt compounds include diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium nonafluoronormal butane sulfonate, diphenyliodonium perfluoronormal octane sulfonate, diphenyliodonium camphor sulfonate, and bis (4-tert-butylphenyl) iodonium camphor sulfonate.
- iodonium salt compounds such as bis (4-tert-butylphenyl) iodonium trifluoromethanesulfonate, and triphenylsulfonium hexafluoroantimonate, triphenylsulfonium nonafluoronormal butane sulfonate, triphenylsulfonium camphorsulfonate and triphenylsulfonium trifluoromethanesulfonate.
- sulfonium salt compounds and the like can be mentioned.
- sulfoneimide compound examples include N- (trifluoromethanesulfonyloxy) succinimide, N- (nonafluoronormalbutanesulfonyloxy) succinimide, N- (kanfersulfonyloxy) succinimide and N- (trifluoromethanesulfonyloxy) naphthalimide. Can be mentioned.
- disulfonyl diazomethane compound examples include bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, and bis (2,4-dimethylbenzenesulfonyl).
- Diazomethane methylsulfonyl-p-toluenesulfonyldiazomethane and the like. Only one kind of the acid generator can be used, or two or more kinds can be used in combination. When the above acid generator is used, the content ratio of the acid generator is, for example, 0.1% by mass to 50% by mass, preferably 1% by mass to 30% by mass, based on the following cross-linking agent. ..
- cross-linking agent examples include hexamethoxymethylmelamine, tetramethoxymethylbenzoguanamine, and 1,3,4,6-tetrakis (methoxymethyl) glycoluril (tetramethoxy).
- Methyl Glycoluryl (POWDERLINK® 1174), 1,3,4,6-tetrakis (butoxymethyl) glycoluryl, 1,3,4,6-tetrakis (hydroxymethyl) glycoluryl, 1,3-bis (Hydroxymethyl) urea, 1,1,3,3-tetrakis (butoxymethyl) urea, 1,1,3,3-tetrakis (methoxymethyl) urea and and 2,4,6-tris [bis (methoxymethyl)) Amino] -1,3,5-triazine ((trade name) Cymel [registered trademark] -303, Nicarac [registered trademark] MW-390) can be mentioned.
- the cross-linking agent of the present application may be a nitrogen-containing compound described in WO2017 / 187969, which has 2 to 6 substituents represented by the following formula (1X) that bind to a nitrogen atom in one molecule. good.
- R 1 represents a methyl group or an ethyl group.
- the nitrogen-containing compound having 2 to 6 substituents represented by the formula (1X) in one molecule may be a glycoluril derivative represented by the following formula (1A).
- each of the four R 1s independently represents a methyl group or an ethyl group, and R 2 and R 3 independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, respectively.
- Examples of the glycoluril derivative represented by the formula (1A) include compounds represented by the following formulas (1A-1) to (1A-6).
- the compound represented by the formula (1A) is represented by a nitrogen-containing compound having 2 to 6 substituents represented by the following formula (2X) that binds to a nitrogen atom in one molecule and the following formula (3).
- the glycoluril derivative represented by the formula (1A) is obtained by reacting the glycoluril derivative represented by the following formula (2A) with at least one compound represented by the formula (3).
- the nitrogen-containing compound having 2 to 6 substituents represented by the formula (2X) in one molecule is, for example, a glycoluril derivative represented by the following formula (2A).
- R 2 and R 3 independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, and R 4 independently represents an alkyl group having 1 to 4 carbon atoms. Represents a group.
- Examples of the glycoluril derivative represented by the formula (2A) include compounds represented by the following formulas (2A-1) to (2A-4). Further, examples of the compound represented by the above formula (3) include compounds represented by the following formulas (3-1) and (3-2).
- the content of the nitrogen-containing compound having 2 to 6 substituents represented by the following formula (1X) bonded to the nitrogen atom in one molecule is the same as that described in WO2017 / 187969.
- the content ratio of the cross-linking agent is, for example, 1% by mass to 50% by mass, preferably 5% by mass to 30% by mass, based on the reaction product.
- the resist underlayer film forming composition of the present invention does not generate pinholes or stirries, and a surfactant can be further added in order to further improve the coatability against surface unevenness.
- a surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, and polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, and polyoxyethylene nonylphenol ether.
- Polyoxyethylene alkylallyl ethers such as polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate, etc.
- Solbitan fatty acid esters polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate, etc.
- Nonionic surfactants such as fatty acid esters, Ftop EF301, EF303, EF352 (manufactured by Tochem Products Co., Ltd., trade name), Megafuck F171, F173, R-30 (manufactured by Dainippon Ink Co., Ltd., product) Name), Florard FC430, FC431 (manufactured by Sumitomo 3M Co., Ltd., trade name), Asahi Guard AG710, Surfron S-382, SC101, SC102, SC103, SC104, SC105, SC106 (manufactured by Asahi Glass Co., Ltd., trade name), etc.
- fatty acid esters Ftop EF301, EF303, EF352 (manufactured by Tochem Products Co., Ltd., trade name), Megafuck F171, F173, R-30 (manufactured by Dainippon Ink Co., Ltd., product) Name), Florard FC430, FC431 (manufact
- Fluorosurfactant organosiloxane polymer KP341 (manufactured by Shin-Etsu Chemical Industry Co., Ltd.) and the like can be mentioned.
- the blending amount of these surfactants is usually 2.0% by mass or less, preferably 1.0% by mass or less, based on the total solid content of the resist underlayer film forming composition of the present invention.
- These surfactants may be added alone or in combination of two or more.
- the resist underlayer film forming composition of the present application is preferably an electron beam resist underlayer film forming composition or an EUV resist underlayer film forming composition used in an electron beam (EB) drawing step and an EUV exposure step, preferably EUV. It is preferably a resist underlayer film forming composition.
- the resist underlayer film according to the present invention can be produced by applying the above-mentioned resist underlayer film forming composition on a semiconductor substrate and firing it.
- the resist underlayer film according to the present invention is preferably an electron beam resist underlayer film or an EUV resist underlayer film.
- Examples of the semiconductor substrate to which the resist underlayer film forming composition of the present invention is applied include silicon wafers, germanium wafers, and compound semiconductor wafers such as gallium arsenide, indium phosphide, gallium nitride, indium nitride, and aluminum nitride. Will be.
- the inorganic film can be, for example, ALD (atomic layer deposition) method, CVD (chemical vapor deposition) method, reactive sputtering method, ion plating method, vacuum deposition. It is formed by a method, a spin coating method (spin-on-glass: SOG).
- ALD atomic layer deposition
- CVD chemical vapor deposition
- reactive sputtering method reactive sputtering method
- ion plating method vacuum deposition. It is formed by a method, a spin coating method (spin-on-glass: SOG).
- spin-on-glass: SOG spin-on-glass
- the inorganic film include a polysilicon film, a silicon oxide film, a silicon nitride film, a BPSG (Boro-Phospho Silicone Glass) film, a titanium nitride film, a titanium nitride film, a tungsten film, a gallium nitride film, and a gallium ar
- the resist underlayer film forming composition of the present invention is applied onto such a semiconductor substrate by an appropriate coating method such as a spinner or a coater. Then, the resist underlayer film is formed by baking using a heating means such as a hot plate.
- the baking conditions are appropriately selected from a baking temperature of 100 ° C. to 400 ° C. and a baking time of 0.3 minutes to 60 minutes.
- the bake temperature is preferably 120 ° C. to 350 ° C. and the bake time is 0.5 minutes to 30 minutes, and more preferably the bake temperature is 150 ° C. to 300 ° C. and the bake time is 0.8 minutes to 10 minutes. If the baking temperature is lower than the above range, crosslinking will be insufficient. On the other hand, if the temperature at the time of baking is higher than the above range, the resist underlayer film may be decomposed by heat.
- the film thickness of the resist underlayer film to be formed is, for example, 0.001 ⁇ m (1 nm) to 10 ⁇ m, 0.002 ⁇ m (2 nm) to 1 ⁇ m, 0.005 ⁇ m (5 nm) to 0.5 ⁇ m (500 nm), 0.001 ⁇ m (1 nm).
- the method for manufacturing the patterned substrate goes through the following steps. Usually, it is manufactured by forming a photoresist layer on a resist underlayer film.
- the photoresist formed by applying and firing on the resist underlayer film by a method known per se is not particularly limited as long as it is sensitive to the light used for exposure. Both negative photoresists and positive photoresists can be used.
- a positive photoresist consisting of a novolak resin and a 1,2-naphthoquinone diazidosulfonic acid ester, a chemically amplified photoresist consisting of a binder having a group that decomposes with an acid to increase the alkali dissolution rate and a photoacid generator, and an acid.
- a chemically amplified photoresist consisting of a low molecular weight compound that decomposes to increase the alkali dissolution rate of the photoresist, an alkali-soluble binder, and a photoacid generator, and a binder having a group that decomposes with an acid to increase the alkali dissolution rate.
- photoresists composed of low molecular weight compounds and photoacid generators that decompose with acid to increase the alkali dissolution rate of photoresists, and resists containing metal elements.
- the product name V146G manufactured by JSR Corporation the product name APEX-E manufactured by Shipley Co., Ltd.
- the product name PAR710 manufactured by Sumitomo Chemical Co., Ltd. the product names AR2772 and SEPR430 manufactured by Shin-Etsu Chemical Co., Ltd.
- Proc. SPIE Vol. 3999, 330-334 (2000)
- Proc. SPIE Vol. 3999,357-364
- Proc. SPIE Vol. Fluorine-containing atomic polymer-based photoresists as described in 3999,365-374 (2000) can be mentioned.
- the exposure is carried out through a mask (reticle) for forming a predetermined pattern, and for example, i-ray, KrF excimer laser, ArF excimer laser, EUV (extreme ultraviolet) or EB (electron beam) are used.
- the resist underlayer film forming composition of the above is preferably applied for EUV (extreme ultraviolet) or EB (electron beam) exposure, and particularly preferably for EUV (extreme ultraviolet) exposure.
- An alkaline developer is used for development, and the development temperature is appropriately selected from 5 ° C to 50 ° C and the development time is 10 seconds to 300 seconds.
- alkaline developer examples include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, inorganic alkalis such as aqueous ammonia, primary amines such as ethylamine and n-propylamine, diethylamine, and the like. Secondary amines such as g-n-butylamine, tertiary amines such as triethylamine and methyldiethylamine, alcoholamines such as dimethylethanolamine and triethanolamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, choline and the like.
- an aqueous solution of an alkali such as a quaternary ammonium salt, cyclic amines such as pyrrole and piperidine can be used.
- an alcohol such as isopropyl alcohol and a surfactant such as a nonionic surfactant can be added to the aqueous solution of the alkalis in an appropriate amount for use.
- the preferred developer is a quaternary ammonium salt, more preferably tetramethylammonium hydroxide and choline.
- a surfactant or the like can be added to these developers.
- a method of developing with an organic solvent such as butyl acetate to develop a portion of the photoresist in which the alkali dissolution rate has not been improved can also be used. Through the above steps, a substrate on which the above resist is patterned can be manufactured.
- the resist underlayer film is dry-etched using the formed resist pattern as a mask.
- the inorganic film is formed on the surface of the used semiconductor substrate, the surface of the inorganic film is exposed, and if the inorganic film is not formed on the surface of the used semiconductor substrate, the semiconductor substrate is exposed. Expose the surface.
- the semiconductor device can be manufactured through a step of processing the substrate by a method known per se (dry etching method or the like).
- the weight average molecular weight (Mw) of the polymer (A) shown in the synthesis example below is a measurement result by a gel permeation chromatography (GPC) method.
- GPC gel permeation chromatography
- Measuring device HLC-8020GPC [Product name] (manufactured by Tosoh Corporation)
- GPC column TSKgel G2000HXL; 2 pcs, G3000HXL: 1 pcs, G4000HXL; 1 pcs [Product name] (All manufactured by Tosoh Corporation)
- Solvent Tetrahydrofuran (THF)
- Flow rate 1.0 ml / min
- Standard sample Polystyrene (manufactured by Tosoh Corporation)
- Reaction product 1 contains the following structure as a repeating unit structure.
- Reaction product 2 contains the following structure as a repeating unit structure.
- the reaction product 3 contains the following structure as a repeating unit structure.
- the reaction product 4 contains the following structure as a repeating unit structure.
- the reaction product 5 contains the following structure as a repeating unit structure.
- the reaction product 6 contains the following structure as a repeating unit structure.
- the reaction product 7 contains the following structure as a repeating unit structure.
- the reaction product 8 contains the following structure as a repeating unit structure.
- Propylene glycol is obtained by mixing 0.11 g of tetramethoxymethyl glycol uryl and 0.012 g of p-phenolsulfonic acid pyridinium salt in 3.12 g of the solution containing 0.047 g of the reaction product 1 obtained in Synthesis Example 1. 263.41 g of monomethyl ether and 29.89 g of propylene glycol monomethyl ether acetate were added and dissolved. Then, it was filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m to prepare a resist underlayer film forming composition.
- Example 2 to 6 A resist underlayer film forming composition was prepared by the same method as in Example 1 except that reaction products 2 to 6 were used instead of the reaction product 1.
- a resist underlayer film forming composition was prepared by the same method as in Example 1 except that reaction products 7 to 8 were used instead of the reaction product 1.
- resist patterning evaluation [Resist pattern formation test using electron beam lithography system]
- the resist underlayer film forming composition was applied onto each silicon wafer using a spinner.
- the silicon wafer was baked on a hot plate at 205 ° C. for 60 seconds to obtain a resist underlayer film having a film thickness of 5 nm.
- a negative resist solution for EUV (containing a methacrylic polymer) was spin-coated on the resist underlayer film and heated at 100 ° C. for 60 seconds to form an EUV resist film.
- the resist film was exposed under predetermined conditions using an electron beam lithography system (ELS-G130). After exposure, baking (PEB) was performed at 100 ° C.
- ELS-G130 electron beam lithography system
- the photoresist pattern thus obtained is observed from above the pattern, and the minimum CD size in which no collapse is seen in the shot of the resist pattern and the connection (bridge) between the adjacent patterns can be seen.
- the maximum CD size that could not be confirmed was confirmed, and the range in which the pattern was well resolved was confirmed.
- the results of Examples 1 to 6 show that the size range that can form a good pattern is wider than that of Comparative Examples 1 and 2. Is shown.
- Table 1 shows the observation results of the resist patterns confirmed in Examples 1 to 6 and Comparative Examples 1 and 2.
- the resist underlayer film forming composition according to the present invention is a composition for forming a resist underlayer film capable of forming a desired resist pattern, a method for producing a substrate with a resist pattern using the resist underlayer film forming composition, and a semiconductor.
- a method of manufacturing an apparatus can be provided.
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Abstract
Description
そこでこの問題を解決すべく、レジストと半導体基板の間にレジスト下層膜を設ける方法が広く検討されている。
(B)(A)と異なるヒダントイン含有化合物と
の反応生成物、
及び有機溶剤を含む、レジスト下層膜形成組成物。
[式(A-1)及び式(B-1)中、T1、T2、T3及びT4は各々独立して、水素原子、酸素原子若しくは硫黄原子で中断されていてもよくヒドロキシ基で置換されていてもよい炭素原子数1~10のアルキル基、ヒドロキシ基で置換されていてもよい炭素原子数6~40のアリール基又は炭素原子数3~6のアルケニル基を表す。]で各々表される、[1]に記載のレジスト下層膜形成組成物。
(式(1)及び式(2)中、R1は置換基を有してもよい炭素原子数1~6のアルキル基、フェニル基、ピリジル基、ハロゲノ基又はヒドロキシ基を表し、R2は水素原子、炭素原子数1~6のアルキル基、ヒドロキシ基、ハロゲノ基又は-C(=O)O-Xで表されるエステル基を表し、Xは置換基を有してもよい炭素原子数1~6のアルキル基を表し、R3は水素原子、炭素原子数1~6のアルキル基、ヒドロキシ基又はハロゲノ基を表し、R4は直接結合、又は炭素原子数1~8の二価の有機基を表し、R5は炭素原子数1~8の二価の有機基を表し、Aは芳香族環又は芳香族複素環を表し、tは0又は1を表し、uは1又は2を表す。)で表される、[4]又は[5]に記載のレジスト下層膜形成組成物。
前記レジスト下層膜の上にレジスト膜を形成する工程と、
レジスト膜に対する光又は電子線の照射とその後の現像によりレジストパターンを形成する工程と、
形成された前記レジストパターンを介して前記レジスト下層膜をエッチングすることによりパターン化されたレジスト下層膜を形成する工程と、
パターン化された前記レジスト下層膜により半導体基板を加工する工程と、
を含むことを特徴とする、半導体装置の製造方法。
上記(A)化合物が式(A-1)、(B)化合物が式(B-1):
[式(A-1)及び式(B-1)中、T1、T2、T3及びT4は各々独立して、水素原子、酸素原子若しくは硫黄原子で中断されていてもよくヒドロキシ基で置換されていてもよい炭素原子数1~10のアルキル基、ヒドロキシ基で置換されていてもよい炭素原子数6~40のアリール基又は炭素原子数3~6のアルケニル基を表す。]で各々表されることが好ましい。T1、T2、T3及びT4は全て同一でもよく、全て異なっていてもよく、一部が同一でもよい。
本発明のレジスト下層膜形成組成物に含まれる有機溶剤としては、例えば、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、メチルセロソルブアセテート、エチルセロソルブアセテート、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、プロピレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールプロピルエーテルアセテート、トルエン、キシレン、メチルエチルケトン、メチルイソブチルケトン、シクロペンタノン、シクロヘキサノン、シクロヘプタノン、4-メチル-2-ペンタノール、2―ヒドロキシイソ酪酸メチル、2―ヒドロキシイソ酪酸エチル、エトキシ酢酸エチル、酢酸2-ヒドロキシエチル、3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、ピルビン酸メチル、ピルビン酸エチル、酢酸エチル、酢酸ブチル、乳酸エチル、乳酸ブチル、2-ヘプタノン、メトキシシクロペンタン、アニソール、γ-ブチロラクトン、N-メチルピロリドン、N,N-ジメチルホルムアミド、及びN,N-ジメチルアセトアミドが挙げられる。これらの溶剤は、単独で又は2種以上を組み合わせて用いることができる。
前記官能基を有する化合物で封止されている構造が、下記式(1)又は式(2):
(式(1)及び式(2)中、R1は置換基を有してもよい炭素原子数1~6のアルキル基、フェニル基、ピリジル基、ハロゲノ基又はヒドロキシ基を表し、R2は水素原子、炭素原子数1~6のアルキル基、ヒドロキシ基、ハロゲノ基又は-C(=O)O-Xで表されるエステル基を表し、Xは置換基を有してもよい炭素原子数1~6のアルキル基を表し、R3は水素原子、炭素原子数1~6のアルキル基、ヒドロキシ基又はハロゲノ基を表し、R4は直接結合、又は炭素原子数1~8の二価の有機基を表し、R5は炭素原子数1~8の二価の有機基を表し、Aは芳香族環又は芳香族複素環を表し、tは0又は1を表し、uは1又は2を表す。)で表されることが好ましい。
(上記式(1a)及び式(2a)の記号の意味は、前記式(1)及び式(2)で説明した通りである。)
前記式(1a)で表される化合物として、例えば、下記式で表される化合物を挙げることができる。下記具体例のカルボキシ基又はヒドロキシ基が、アミノ基又はチオール基に置き換わった化合物も具体例として挙げられる。
前記式(2a)で表される化合物として、例えば、下記式で表される化合物を挙げることができる。下記具体例のカルボキシ基が、ヒドロキシ基、アミノ基又はチオール基に置き換わった化合物も具体例として挙げられる。
本発明のレジスト下層膜形成組成物に任意成分として含まれる酸発生剤としては、熱酸発生剤、光酸発生剤何れも使用することができるが、熱酸発生剤を使用することが好ましい。熱酸発生剤としては、例えば、p-トルエンスルホン酸、トリフルオロメタンスルホン酸、ピリジニウム-p-トルエンスルホネート(ピリジニウム-p-トルエンスルホン酸)、ピリジニウム-p-ヒドロキシベンゼンスルホン酸(p-フェノールスルホン酸ピリジニウム塩)、ピリジニウム-トリフルオロメタンスルホン酸、サリチル酸、カンファースルホン酸、5-スルホサリチル酸、4-クロロベンゼンスルホン酸、4-ヒドロキシベンゼンスルホン酸、ベンゼンジスルホン酸、1-ナフタレンスルホン酸、クエン酸、安息香酸、ヒドロキシ安息香酸等のスルホン酸化合物及びカルボン酸化合物が挙げられる。
前記光酸発生剤としては、オニウム塩化合物、スルホンイミド化合物、及びジスルホニルジアゾメタン化合物等が挙げられる。
オニウム塩化合物としてはジフェニルヨードニウムヘキサフルオロホスフェート、ジフェニルヨードニウムトリフルオロメタンスルホネート、ジフェニルヨードニウムノナフルオロノルマルブタンスルホネート、ジフェニルヨードニウムパーフルオロノルマルオクタンスルホネート、ジフェニルヨードニウムカンファースルホネート、ビス(4-tert-ブチルフェニル)ヨードニウムカンファースルホネート及びビス(4-tert-ブチルフェニル)ヨードニウムトリフルオロメタンスルホネート等のヨードニウム塩化合物、及びトリフェニルスルホニウムヘキサフルオロアンチモネート、トリフェニルスルホニウムノナフルオロノルマルブタンスルホネート、トリフェニルスルホニウムカンファースルホネート及びトリフェニルスルホニウムトリフルオロメタンスルホネート等のスルホニウム塩化合物等が挙げられる。
スルホンイミド化合物としては、例えばN-(トリフルオロメタンスルホニルオキシ)スクシンイミド、N-(ノナフルオロノルマルブタンスルホニルオキシ)スクシンイミド、N-(カンファースルホニルオキシ)スクシンイミド及びN-(トリフルオロメタンスルホニルオキシ)ナフタルイミド等が挙げられる。
ジスルホニルジアゾメタン化合物としては、例えば、ビス(トリフルオロメチルスルホニル)ジアゾメタン、ビス(シクロヘキシルスルホニル)ジアゾメタン、ビス(フェニルスルホニル)ジアゾメタン、ビス(p-トルエンスルホニル)ジアゾメタン、ビス(2,4-ジメチルベンゼンスルホニル)ジアゾメタン、及びメチルスルホニル-p-トルエンスルホニルジアゾメタン等が挙げられる。
前記酸発生剤は一種のみを使用することができ、または二種以上を組み合わせて使用することができる。
上記酸発生剤が使用される場合、当該酸発生剤の含有割合は、下記架橋剤に対し、例えば0.1質量%~50質量%であり、好ましくは、1質量%~30質量%である。
本発明のレジスト下層膜形成組成物に任意成分として含まれる架橋剤としては、例えば、ヘキサメトキシメチルメラミン、テトラメトキシメチルベンゾグアナミン、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル(テトラメトキシメチルグリコールウリル)(POWDERLINK〔登録商標〕1174)、1,3,4,6-テトラキス(ブトキシメチル)グリコールウリル、1,3,4,6-テトラキス(ヒドロキシメチル)グリコールウリル、1,3-ビス(ヒドロキシメチル)尿素、1,1,3,3-テトラキス(ブトキシメチル)尿素、1,1,3,3-テトラキス(メトキシメチル)尿素及び及び2,4,6-トリス[ビス(メトキシメチル)アミノ]-1,3,5-トリアジン((商品名)Cymel〔登録商標〕-303, ニカラック〔登録商標〕MW-390)が挙げられる。
また、本願の架橋剤は、WO2017/187969号公報に記載の、窒素原子と結合する下記式(1X)で表される置換基を1分子中に2乃至6つ有する含窒素化合物であってもよい。
(式(1X)中、R1はメチル基又はエチル基を表す。)
前記式(1X)で表される置換基を1分子中に2乃至6つ有する含窒素化合物は下記式(1A)で表されるグリコールウリル誘導体であってよい。
(式(1A)中、4つのR1はそれぞれ独立にメチル基又はエチル基を表し、R2及びR3はそれぞれ独立に水素原子、炭素原子数1乃至4のアルキル基、又はフェニル基を表す。)
前記式(1A)で表されるグリコールウリル誘導体として、例えば、下記式(1A-1)乃至式(1A-6)で表される化合物が挙げられる。
前記式(1A)で表される化合物は、窒素原子と結合する下記式(2X)で表される置換基を1分子中に2乃至6つ有する含窒素化合物と下記式(3)で表される少なくとも1種の化合物とを反応させて前記式(1X)で表される置換基を1分子中に2乃至6つ有する含窒素化合物を製造することで得られる。
前記式(1A)で表されるグリコールウリル誘導体は、下記式(2A)で表されるグリコールウリル誘導体と前記式(3)で表される少なくとも1種の化合物とを反応させることにより得られる。
前記式(2X)で表される置換基を1分子中に2乃至6つ有する含窒素化合物は、例えば、下記式(2A)で表されるグリコールウリル誘導体である。
(式(2A)中、R2は及びR3はそれぞれ独立に水素原子、炭素原子数1乃至4のアルキル基、又はフェニル基を表し、R4はそれぞれ独立に炭素原子数1乃至4のアルキル基を表す。)
前記式(2A)で表されるグリコールウリル誘導体として、例えば、下記式(2A-1)乃至式(2A-4)で表される化合物が挙げられる。さらに前記式(3)で表される化合物として、例えば下記式(3-1)及び式(3-2)で表される化合物が挙げられる。
上記窒素原子と結合する下記式(1X)で表される置換基を1分子中に2乃至6つ有する含窒素化合物に係る内容については、WO2017/187969号公報に記載の内容に準ずる。
上記架橋剤が使用される場合、当該架橋剤の含有割合は、前記反応生成物に対し、例えば1質量%~50質量%であり、好ましくは、5質量%~30質量%である。
本発明のレジスト下層膜形成組成物には、ピンホールやストレーション等の発生がなく、表面むらに対する塗布性をさらに向上させるために、さらに界面活性剤を添加することができる。界面活性剤としては、例えばポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンオレイルエーテル等のポリオキシエチレンアルキルエーテル類、ポリオキシエチレンオクチルフェノールエーテル、ポリオキシエチレンノニルフェノールエーテル等のポリオキシエチレンアルキルアリルエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロックコポリマー類、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタンモノオレエート、ソルビタントリオレエート、ソルビタントリステアレート等のソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタンモノラウレート、ポリオキシエチレンソルビタンモノパルミテート、ポリオキシエチレンソルビタンモノステアレート、ポリオキシエチレンソルビタントリオレエート、ポリオキシエチレンソルビタントリステアレート等のポリオキシエチレンソルビタン脂肪酸エステル類等のノニオン系界面活性剤、エフトップEF301、EF303、EF352((株)トーケムプロダクツ製、商品名)、メガファックF171、F173、R-30(大日本インキ(株)製、商品名)、フロラードFC430、FC431(住友スリーエム(株)製、商品名)、アサヒガードAG710、サーフロンS-382、SC101、SC102、SC103、SC104、SC105、SC106(旭硝子(株)製、商品名)等のフッ素系界面活性剤、オルガノシロキサンポリマーKP341(信越化学工業(株)製)等を挙げることができる。これらの界面活性剤の配合量は、本発明のレジスト下層膜形成組成物の全固形分に対して通常2.0質量%以下、好ましくは1.0質量%以下である。これらの界面活性剤は単独で添加してもよいし、また2種以上の組合せで添加することもできる。
本発明に係るレジスト下層膜は、上述したレジスト下層膜形成組成物を半導体基板上に塗布し、焼成することにより製造することができる。
パターンニングされた基板の製造方法は以下の工程を経る。通常、レジスト下層膜の上にフォトレジスト層を形成して製造される。レジスト下層膜の上に自体公知の方法で塗布、焼成して形成されるフォトレジストとしては露光に使用される光に感光するものであれば特に限定はない。ネガ型フォトレジスト及びポジ型フォトレジストのいずれも使用できる。ノボラック樹脂と1,2-ナフトキノンジアジドスルホン酸エステルとからなるポジ型フォトレジスト、酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと光酸発生剤からなる化学増幅型フォトレジスト、酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物とアルカリ可溶性バインダーと光酸発生剤とからなる化学増幅型フォトレジスト、及び酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物と光酸発生剤からなる化学増幅型フォトレジスト、メタル元素を含有するレジストなどがある。例えば、JSR(株)製商品名V146G、シプレー社製商品名APEX-E、住友化学工業(株)製商品名PAR710、及び信越化学工業(株)製商品名AR2772、SEPR430等が挙げられる。また、例えば、Proc.SPIE,Vol.3999,330-334(2000)、Proc.SPIE,Vol.3999,357-364(2000)、やProc.SPIE,Vol.3999,365-374(2000)に記載されているような、含フッ素原子ポリマー系フォトレジストを挙げることができる。
GPCカラム:TSKgel G2000HXL;2本、G3000HXL:1本、G4000HXL;1本〔商品名〕(全て東ソー株式会社製)
カラム温度:40℃
溶媒:テトラヒドロフラン(THF)
流量:1.0ml/分
標準試料:ポリスチレン(東ソー株式会社製)
N,N-ジグリシジル-5,5-ジメチルヒダントイン4.91g、5,5-ジメチルヒダントイン2.83g、テトラブチルホスホニウムブロマイド0.27gを、プロピレングリコールモノメチルエーテル12.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で24時間反応させ、反応生成物1溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物1は標準ポリスチレン換算にて重量平均分子量1400であった。
N,N-ジグリシジル-5,5-ジメチルヒダントイン4.00g、5-フェニルヒダントイン3.71g、テトラブチルホスホニウムブロマイド0.30gを、プロピレングリコールモノメチルエーテル12.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で24時間反応させ、反応生成物2溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物2は標準ポリスチレン換算にて重量平均分子量3500であった。
N,N-ジグリシジル-5,5-ジメチルヒダントイン3.66g、5,5-ジフェニルヒダントイン4.15g、テトラブチルホスホニウムブロマイド0.20gを、プロピレングリコールモノメチルエーテル12.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で24時間反応させ、反応生成物3溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物3は標準ポリスチレン換算にて重量平均分子量3100であった。
N,N-ジグリシジル-5,5-ジメチルヒダントイン4.52g、5-フェニルヒダントイン2.97g、3-ヒドロキシ-1-アダマンタンカルボン酸1.17g、テトラブチルホスホニウムブロマイド0.34gを、プロピレングリコールモノメチルエーテル11.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で24時間反応させ、反応生成物4溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物4は標準ポリスチレン換算にて重量平均分子量2400であった。
N,N-ジグリシジル-5,5-ジメチルヒダントイン4.01g、5-フェニルヒダントイン2.64g、4-(メチルスルホニル)安息香酸1.06g、テトラブチルホスホニウムブロマイド0.30gを、プロピレングリコールモノメチルエーテル12.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で24時間反応させ、反応生成物5溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物5は標準ポリスチレン換算にて重量平均分子量1900であった。
N,N-ジグリシジル-5,5-ジメチルヒダントイン4.62g、5-フェニルヒダントイン3.04g、5-ノルボルネン-2,3-ジカルボン酸無水物1.06g、テトラブチルホスホニウムブロマイド0.34gを、プロピレングリコールモノメチルエーテル11.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で24時間反応させ、反応生成物6溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物6は標準ポリスチレン換算にて重量平均分子量2100であった。
モノアリルジグリシジルイソシアヌル酸8.00g、バルビタール5.45g、テトラブチルホスホニウムブロマイド0.48gを、プロピレングリコールモノメチルエーテル56.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で10時間反応させ、反応生成物7溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物7は標準ポリスチレン換算にて重量平均分子量10000であった。
N,N-ジグリシジル-5,5-ジメチルヒダントイン3.66g、バルビタール5.45g、テトラブチルホスホニウムブロマイド0.48gを、プロピレングリコールモノメチルエーテル56.00gに加え溶解させた。反応容器を窒素置換後、還流加熱で10時間反応させ、反応生成物8溶液を得た。GPC分析を行ったところ、得られた溶液中の反応生成物8は標準ポリスチレン換算にて重量平均分子量4000であった。
上記合成例1で得られた、0.047gの反応生成物1を含む溶液3.12gに、テトラメトキシメチルグリコールウリル0.11gとp-フェノールスルホン酸ピリジニウム塩0.012gを混合し、プロピレングリコールモノメチルエーテル263.41g及びプロピレングリコールモノメチルエーテルアセテート29.89gを加え溶解させた。その後孔径0.05μmのポリエチレン製ミクロフィルターを用いてろ過して、レジスト下層膜形成組成物を調製した。
反応生成物1の代わりに反応生成物2~6を用いた以外は、実施例1と同様の方法により、レジスト下層膜形成組成物を調製した。
反応生成物1の代わりに反応生成物7~8を用いた以外は、実施例1と同様の方法により、レジスト下層膜形成組成物を調製した。
〔電子線描画装置によるレジストパターンの形成試験〕
レジスト下層膜形成組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。そのシリコンウェハーを、ホットプレート上で205℃、60秒間ベークし、膜厚5nmのレジスト下層膜を得た。そのレジスト下層膜上に、EUV用ネガ型レジスト溶液(メタクリルポリマー含有)をスピンコートし、100℃で60秒間加熱し、EUVレジスト膜を形成した。そのレジスト膜に対し、電子線描画装置(ELS-G130)を用い、所定の条件で露光した。露光後、100℃で60秒間ベーク(PEB)を行い、クーリングプレート上で室温まで冷却し、酢酸ブチルで現像した後、ピラーサイズが17nm~28nmのレジストパターンを形成した。レジストパターンの測長には走査型電子顕微鏡((株)日立ハイテクノロジーズ製、CG4100)を用いた。
Claims (13)
- (A)エポキシ基を2つ有するヒダントイン含有化合物と、
(B)(A)と異なるヒダントイン含有化合物と
の反応生成物、
及び有機溶剤を含む、レジスト下層膜形成組成物。 - 前記反応生成物が、(B)ヒダントイン含有化合物が有する2級アミノ基と、(A)ヒダントイン含有化合物が有するエポキシ基との反応生成物である、請求項1に記載のレジスト下層膜形成組成物。
- 前記反応生成物の末端が、官能基を有する化合物で封止されている、請求項1~3何れか1項に記載のレジスト下層膜形成組成物。
- 前記官能基が、カルボキシ基、ヒドロキシ基、アミノ基、イミノ基及びチオール基から選ばれる、請求項4に記載のレジスト下層膜形成組成物。
- 前記官能基を有する化合物が、炭素-炭素結合がヘテロ原子で中断されていてもよく且つ置換基で置換されていてもよい脂肪族環を含む、請求項4に記載のレジスト下層膜形成組成物。
- 前記官能基を有する化合物で封止されている構造が、下記式(1)及び式(2):
(式(1)及び式(2)中、R1は置換基を有してもよい炭素原子数1~6のアルキル基、フェニル基、ピリジル基、ハロゲノ基又はヒドロキシ基を表し、R2は水素原子、炭素原子数1~6のアルキル基、ヒドロキシ基、ハロゲノ基又は-C(=O)O-Xで表されるエステル基を表し、Xは置換基を有してもよい炭素原子数1~6のアルキル基を表し、R3は水素原子、炭素原子数1~6のアルキル基、ヒドロキシ基又はハロゲノ基を表し、R4は直接結合、又は炭素原子数1~8の二価の有機基を表し、R5は炭素原子数1~8の二価の有機基を表し、Aは芳香族環又は芳香族複素環を表し、tは0又は1を表し、uは1又は2を表す。)で表される、請求項4又は5に記載のレジスト下層膜形成組成物。 - 酸発生剤をさらに含む、請求項1~7の何れか1項に記載のレジスト下層膜形成組成物。
- 架橋剤をさらに含む、請求項1~8の何れか1項に記載のレジスト下層膜形成組成物。
- 請求項1~9何れか1項に記載の電子線又はEUVレジスト下層膜形成組成物。
- 請求項1~10の何れか1項に記載のレジスト下層膜形成組成物からなる塗布膜の焼成物であることを特徴とするレジスト下層膜。
- 半導体基板上に請求項1~10の何れか1項に記載のレジスト下層膜形成組成物を塗布しベークしてレジスト下層膜を形成する工程、前記レジスト下層膜上にレジストを塗布しベークしてレジスト膜を形成する工程、前記レジスト下層膜と前記レジストで被覆された半導体基板を露光する工程、露光後の前記レジスト膜を現像し、パターニングする工程を含む、パターニングされた基板の製造方法。
- 半導体基板上に、請求項1~10の何れか1項に記載のレジスト下層膜形成組成物からなるレジスト下層膜を形成する工程と、
前記レジスト下層膜の上にレジスト膜を形成する工程と、
レジスト膜に対する光又は電子線の照射とその後の現像によりレジストパターンを形成する工程と、
形成された前記レジストパターンを介して前記レジスト下層膜をエッチングすることによりパターン化されたレジスト下層膜を形成する工程と、
パターン化された前記レジスト下層膜により半導体基板を加工する工程と、
を含むことを特徴とする、半導体装置の製造方法。
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