WO2024070672A1 - Composition de résine photosensible et procédé de formation d'un motif de résine photosensible - Google Patents
Composition de résine photosensible et procédé de formation d'un motif de résine photosensible Download PDFInfo
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- WO2024070672A1 WO2024070672A1 PCT/JP2023/033241 JP2023033241W WO2024070672A1 WO 2024070672 A1 WO2024070672 A1 WO 2024070672A1 JP 2023033241 W JP2023033241 W JP 2023033241W WO 2024070672 A1 WO2024070672 A1 WO 2024070672A1
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- ZZSKMNCIAKKVRB-UHFFFAOYSA-N morpholin-4-yl-(2-nitrophenyl)methanone Chemical compound [O-][N+](=O)C1=CC=CC=C1C(=O)N1CCOCC1 ZZSKMNCIAKKVRB-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- NZIDBRBFGPQCRY-UHFFFAOYSA-N octyl 2-methylprop-2-enoate Chemical compound CCCCCCCCOC(=O)C(C)=C NZIDBRBFGPQCRY-UHFFFAOYSA-N 0.000 description 1
- 229940065472 octyl acrylate Drugs 0.000 description 1
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical group C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- HDBWAWNLGGMZRQ-UHFFFAOYSA-N p-Vinylbiphenyl Chemical compound C1=CC(C=C)=CC=C1C1=CC=CC=C1 HDBWAWNLGGMZRQ-UHFFFAOYSA-N 0.000 description 1
- 125000005582 pentacene group Chemical group 0.000 description 1
- JQQSUOJIMKJQHS-UHFFFAOYSA-N pentaphenyl group Chemical group C1=CC=CC2=CC3=CC=C4C=C5C=CC=CC5=CC4=C3C=C12 JQQSUOJIMKJQHS-UHFFFAOYSA-N 0.000 description 1
- GYDSPAVLTMAXHT-UHFFFAOYSA-N pentyl 2-methylprop-2-enoate Chemical compound CCCCCOC(=O)C(C)=C GYDSPAVLTMAXHT-UHFFFAOYSA-N 0.000 description 1
- ULDDEWDFUNBUCM-UHFFFAOYSA-N pentyl prop-2-enoate Chemical compound CCCCCOC(=O)C=C ULDDEWDFUNBUCM-UHFFFAOYSA-N 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical group C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 1
- 229930015698 phenylpropene Natural products 0.000 description 1
- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical group C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 1
- 125000001388 picenyl group Chemical group C1(=CC=CC2=CC=C3C4=CC=C5C=CC=CC5=C4C=CC3=C21)* 0.000 description 1
- FSDNTQSJGHSJBG-UHFFFAOYSA-N piperidine-4-carbonitrile Chemical compound N#CC1CCNCC1 FSDNTQSJGHSJBG-UHFFFAOYSA-N 0.000 description 1
- PMJHHCWVYXUKFD-UHFFFAOYSA-N piperylene Natural products CC=CC=C PMJHHCWVYXUKFD-UHFFFAOYSA-N 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005650 polypropylene glycol diacrylate Polymers 0.000 description 1
- 229920005651 polypropylene glycol dimethacrylate Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- BOQSSGDQNWEFSX-UHFFFAOYSA-N propan-2-yl 2-methylprop-2-enoate Chemical compound CC(C)OC(=O)C(C)=C BOQSSGDQNWEFSX-UHFFFAOYSA-N 0.000 description 1
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 description 1
- GHJOIQFPDMIKHT-UHFFFAOYSA-N propane-1,2,3-triol;prop-2-enoic acid Chemical compound OC(=O)C=C.OCC(O)CO GHJOIQFPDMIKHT-UHFFFAOYSA-N 0.000 description 1
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
- LNKHTYQPVMAJSF-UHFFFAOYSA-N pyranthrene Chemical group C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC3=C(C=CC=C4)C4=CC4=CC=C1C2=C34 LNKHTYQPVMAJSF-UHFFFAOYSA-N 0.000 description 1
- 125000003373 pyrazinyl group Chemical group 0.000 description 1
- 125000003226 pyrazolyl group Chemical group 0.000 description 1
- 125000005581 pyrene group Chemical group 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- MNCGMVDMOKPCSQ-UHDJGPCESA-M sodium;(e)-2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)\C=C\C1=CC=CC=C1 MNCGMVDMOKPCSQ-UHDJGPCESA-M 0.000 description 1
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- 125000001935 tetracenyl group Chemical group C1(=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C12)* 0.000 description 1
- QROGIFZRVHSFLM-UHFFFAOYSA-N trans-beta-methyl styrene Natural products CC=CC1=CC=CC=C1 QROGIFZRVHSFLM-UHFFFAOYSA-N 0.000 description 1
- 125000001425 triazolyl group Chemical group 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000005580 triphenylene group Chemical group 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- KOZCZZVUFDCZGG-UHFFFAOYSA-N vinyl benzoate Chemical compound C=COC(=O)C1=CC=CC=C1 KOZCZZVUFDCZGG-UHFFFAOYSA-N 0.000 description 1
- 229920001567 vinyl ester resin Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
- C08L33/16—Homopolymers or copolymers of esters containing halogen atoms
-
- 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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
-
- 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
- G03F7/20—Exposure; Apparatus therefor
Definitions
- the present invention relates to a resist composition and a method for forming a resist pattern.
- resist compositions containing polymers and solvents have been used to form fine patterns by irradiation with ionizing radiation such as electron beams and extreme ultraviolet (EUV) rays, or non-ionizing radiation including short-wavelength light such as ultraviolet rays.
- ionizing radiation such as electron beams and extreme ultraviolet (EUV) rays
- non-ionizing radiation including short-wavelength light such as ultraviolet rays.
- resist compositions are required to have a wide tolerance for the amount of exposure in the exposure process, in other words, a wide exposure margin.
- resist patterns formed using the resist compositions are required to suppress the occurrence of top loss, that is, the height of a line pattern consisting of a portion not exposed in the exposure process (unexposed portion) being significantly reduced after the development process.
- resist residues residues
- the conventional resist compositions described above have room for further improvement in terms of achieving all of the following: an increase in exposure margin, suppression of the occurrence of top loss, and reduction in the amount of resist residue.
- the present invention aims to provide a resist composition and a method for forming a resist pattern that can effectively achieve all of the following: expanding the exposure margin, suppressing the occurrence of top loss, and reducing the amount of resist residue.
- the present inventors conducted extensive research with the aim of solving the above problems. As a result, they discovered that the above problems could be solved by blending a crosslinking agent that reacts with ionizing radiation or non-ionizing radiation with a wavelength of 300 nm or less and two specific types of polymers into a resist composition, and thus completed the present invention.
- an object of the present invention is to advantageously solve the above-mentioned problems, and the present invention provides: [1] a resist composition comprising a crosslinking agent that reacts with ionizing radiation or non-ionizing radiation having a wavelength of 300 nm or less, a solvent, a polymer A, and a polymer B, wherein the surface free energy of the polymer A is greater than the surface free energy of the polymer B, and the difference between the surface free energy of the polymer A and the surface free energy of the polymer B is 3 mJ/ m2 or more.
- the above resist composition can effectively achieve all of the following: an increase in exposure margin, suppression of the occurrence of top loss, and a reduction in the amount of resist residue.
- the "surface free energy" can be measured by the method described in the examples of this specification.
- the resist composition according to the above [1]
- the content of the polymer A in the resist composition is A (parts by mass)
- the content of the polymer is B (parts by mass)
- the content of the crosslinking agent is C (parts by mass)
- the resist composition satisfies the following relational formula (x): A ⁇ (B + C) ... (x) It is preferable that the following conditions are satisfied: (In formula (x), B>0 and C>0.)
- a resist composition that satisfies the above relational expression (x) can further reduce the amount of resist residue in the resist pattern.
- At least one of the polymer A and the polymer B is preferably a main chain cleavage type. If at least one of the polymer A and the polymer B is of the main chain cleavage type, a better effect of expanding the exposure margin, an effect of suppressing the occurrence of top loss, and an effect of reducing the amount of resist residue can be obtained.
- the polymer A is represented by the following formula (II):
- L is a divalent linking group having a fluorine atom
- Ar is an aromatic ring group which may have a substituent
- R5 is a halogen atom, a cyano group, an alkylsulfonyl group, an alkoxy group, a nitro group, an acyl group, an alkyl ester group or a halogenated alkyl group
- R6 and R7 are a hydrogen atom, a halogen atom, an unsubstituted alkyl group or an alkyl group substituted with a halogen atom, and may be the same or different from each other.
- the polymer B is represented by the following formula (IV): [In formula (IV), R 13 is a halogen atom, a cyano group, an alkylsulfonyl group, an alkoxy group, a nitro group, an acyl group, an alkyl ester group, or a halogenated alkyl group, R 14 is an organic group having hydrogen atoms or 0 to 20 fluorine atoms, and R 15 and R 16 are hydrogen atoms, halogen atoms, unsubstituted alkyl groups, or alkyl groups substituted with halogen atoms, and may be the same or different from each other.] and the following formula (V): [In formula (V), R 17 , R 20 , and R 21 are hydrogen atoms, halogen atoms, unsubstituted alkyl groups, or alkyl groups substituted with halogen atoms, and may be the same or different from each other.] and the following formula (V): [In
- the polymer B is a copolymer B having the monomer unit (IV) and the monomer unit (V)
- a better effect of expanding the exposure margin, an effect of suppressing the occurrence of top loss, and an effect of reducing the amount of resist residue can be obtained.
- the crosslinking agent has an unsaturated bond. If a crosslinking agent has an unsaturated bond, it is possible to obtain a better effect of expanding the exposure margin, suppressing the occurrence of top loss, and reducing the amount of resist residue.
- the crosslinking agent has from 1 to 10 unsaturated bonds. If the crosslinking agent has 1 or more and 10 or less unsaturated bonds, it is possible to obtain a better effect of expanding the exposure margin, a better effect of suppressing the occurrence of top loss, and a better effect of reducing the amount of resist residue.
- the unsaturated bond contained in the crosslinking agent is preferably an unsaturated bond contained in a vinyl group, a (meth)acrylate group, or an allyl group. If the crosslinking agent has a functional group containing the specific unsaturated bond, it is possible to obtain a better effect of expanding the exposure margin, a better effect of suppressing the occurrence of top loss, and a better effect of reducing the amount of resist residue.
- the crosslinking agent is preferably contained in an amount of 1 part by mass or more and 50 parts by mass or less relative to a total of 100 parts by mass of the polymer A and the polymer B. If the resist composition contains a crosslinking agent within the above range, it is possible to obtain an even better effect of expanding the exposure margin, suppressing the occurrence of top loss, and reducing the amount of resist residue.
- the present invention also relates to [11] a method for forming a resist pattern, comprising: a resist film forming step of coating a substrate with a resist composition comprising a crosslinking agent that reacts with ionizing radiation or non-ionizing radiation having a wavelength of 300 nm or less, a solvent, a polymer A, and a polymer B to obtain a coating layer, and removing the solvent from the coating layer to form a resist film; and an exposure step of exposing the resist film formed in the resist film forming step to ionizing radiation or non-ionizing radiation having a wavelength of 300 nm or less as exposure light, thereby forming a latent image pattern while progressing a crosslinking reaction by the crosslinking agent.
- the exposure margin in the exposure step is wider, and in the obtained resist pattern, the occurrence of top loss is suppressed and the amount of resist residue can be reduced.
- the method for forming a resist pattern according to [11] above further comprises a developing step of developing the exposed resist film, and the developing is preferably carried out using an alcohol. If the method further includes a step of developing the resist film with alcohol, the amount of resist residue can be further reduced.
- the present invention provides a resist composition and a method for forming a resist pattern that can form a resist pattern with a wide exposure margin, suppressed top loss, and reduced amounts of resist residue.
- the resist composition and method for forming a resist pattern of the present invention are not particularly limited and can be suitably used, for example, when forming a resist pattern in the manufacturing process of a printed circuit board such as a build-up board, a semiconductor, a photomask, a mold, etc.
- the resist composition of the present invention can be suitably used in the method for forming a resist pattern of the present invention.
- the resist composition of the present invention can be suitably used as a positive resist composition.
- the resist composition of the present invention contains a crosslinking agent that reacts with ionizing radiation or non-ionizing radiation having a wavelength of 300 nm or less, a polymer A, a polymer B, and a solvent, and further contains known additives that can be blended into the resist composition.
- the surface free energy of the polymer A is greater than the surface free energy of the polymer B, and the difference between the surface free energy of the polymer A and the surface free energy of the polymer B is 3 mJ/ m2 or more. According to such a resist composition, the exposure margin of the formed resist film is wide, and the occurrence of top loss is suppressed in the obtained resist pattern, and the amount of resist residue is reduced. The reason why these effects are obtained is not clear, but it is presumed to be as follows.
- polymer B which has a smaller surface free energy, can be favorably unevenly distributed on the surface of the resist film.
- a crosslinking agent having a property that can proceed with a crosslinking reaction triggered by ionizing radiation or non-ionizing radiation with a wavelength of 300 nm or less, i.e., radiation that can be used as exposure light in the exposure step, does not crosslink before the exposure step, but starts the crosslinking reaction by being given a trigger, i.e., exposure light, in the exposure step.
- the formation of a latent image pattern proceeds by irradiating the resist film with exposure light. Specifically, when forming a latent image pattern, a difference in solubility in a solvent of the polymer constituting the resist film is formed between the exposed and non-exposed parts of the resist film. That is, as a result of the formation of a latent image pattern, a portion of the polymer that is relatively poorly soluble in a solvent (hereinafter, “poorly soluble portion A”) and a portion of the polymer that is relatively easily soluble in a solvent (hereinafter, “easy-to-dissolve portion B”) are generated.
- poorly soluble portion A a portion of the polymer that is relatively poorly soluble in a solvent
- easy-to-dissolve portion B a portion of the polymer that is relatively easily soluble in a solvent
- the portion with a relatively small amount of exposure in the exposure step i.e., the boundary portion between the exposed and non-exposed parts of the resist film
- the resist film contains the above-mentioned predetermined crosslinking agent in addition to the polymer
- the poor solubility of the poorly soluble portion A can be increased by the reaction between the crosslinking agents themselves and the reaction between the crosslinking agent and the polymer constituting the poorly soluble portion A. This effectively promotes the formation of a difference in solubility between the poorly soluble portion A and the soluble portion B, even when the amount of exposure in the exposure step is relatively small.
- the synergistic effect of the favorable uneven distribution of the polymer on the surface of the resist film and the favorable promotion of the formation of a difference in solubility between the poorly soluble portion A and the easily soluble portion B by the crosslinking agent can effectively achieve all of the following: an increase in exposure margin, suppression of the occurrence of top loss, and reduction in the amount of resist residue.
- the difference between the surface free energy of polymer A and the surface free energy of polymer B (i.e., "surface free energy of polymer A” - “surface free energy of polymer B”) must be 3 mJ / m 2 or more as described above, preferably 4 mJ / m 2 or more, more preferably 5.5 mJ / m 2 or more, even more preferably 6 mJ / m 2 or more, particularly preferably 6.5 mJ / m 2 or more, preferably 12 mJ / m 2 or less, more preferably 11 mJ / m 2 or less, and even more preferably 10 mJ / m 2 or less. If the difference between the surface free energy of polymer A and the surface free energy of polymer B is within the above range, the occurrence of top loss can be further suppressed, and the amount of resist residue can be further reduced.
- a crosslinking agent that reacts with ionizing radiation or non-ionizing radiation having a wavelength of 300 nm or less is used. More specifically, as the crosslinking agent, a crosslinking agent that can be used is one that, when a film made of the crosslinking agent is irradiated with a predetermined radiation to be crosslinked and then immersed for 1 minute in a solvent capable of dissolving the crosslinking agent, reduces the film thickness by less than 50% based on the film thickness before immersion.
- the crosslinking agent has the property of not proceeding with a crosslinking reaction during a drying process (which usually involves heating) for removing the solvent when forming a resist film.
- the number of unsaturated bonds contained in the molecular structure of the crosslinking agent is preferably 1 or more, more preferably 2 or more, and is preferably 10 or less, and more preferably 8 or less.
- the unsaturated bond possessed by the crosslinking agent is an unsaturated bond contained in a vinyl group, a (meth)acrylate group, or an allyl group.
- a crosslinking agent having a functional group containing such a specific unsaturated bond it is possible to obtain an even better effect of expanding the exposure margin, an effect of suppressing the occurrence of top loss, and an effect of reducing the amount of resist residue.
- the crosslinking agent may have only one of a vinyl group, a (meth)acrylate group, and an allyl group, or may have a plurality of groups.
- the number of these functional groups that the crosslinking agent may contain is preferably 1 or more, more preferably 2 or more, and is preferably 10 or less, and more preferably 8 or less.
- Cross-linking agents that can be used include, but are not limited to, compounds having a vinyl group, compounds having an allyl group, acrylate compounds, methacrylate compounds, and isocyanurate compounds.
- the above-mentioned compounds having a vinyl group and compounds having an allyl group include, for example, alkene compounds such as ethylene, propene, 1-butene, 2-butene, iso-butene, 1-pentene, 1-hexene, and 1-octene; cyano group-containing unsaturated hydrocarbon compounds such as acrylonitrile, methacrylonitrile, ⁇ -chloroacrylonitrile, and ⁇ -cyanoethylacrylonitrile; monovinyl ether compounds such as vinyl ethyl ether, vinyl butyl ether, vinyl phenyl ether, vinyl 2-chloroethyl ether, 3,4-dihydro-2H-pyran, 2,3-dihydrofuran, 1,4-dioxene, ethylene glycol monovinyl ether, diethylene glycol monovinyl ether, and isopropenyl methyl ether; divinyl ether, ethylene glycol divinyl ether
- divinyl ether compounds having an aliphatic skeleton such as propylene glycol divinyl ether, dipropylene glycol divinyl ether, tripropylene glycol divinyl ether, polypropylene glycol divinyl ether, butanediol divinyl ether, neopentyl glycol divinyl ether, hexanediol divinyl ether, nonanediol divinyl ether, trimethylolpropane divinyl ether, ethylene oxide-added trimethylolpropane divinyl ether, pentaerythritol divinyl ether, and ethylene oxide-added pentaerythritol divinyl ether; trivinyl ether compounds having an aliphatic skeleton such as trimethylolpropane trivinyl ether and ethylene oxide-added trimethylolpropane trivinyl ether; pentaerythritol tetra
- polyfunctional vinyl ether compounds having an aliphatic skeleton such as tetravinyl ether compounds having an aliphatic skeleton such as dipentaerythritol hexavinyl ether; polyfunctional vinyl ether compounds having an alicyclic skeleton such as 1,4-cyclohexanediol divinyl ether and 1,4-cyclohexanedimethanol divinyl ether; polyfunctional vinyl ether compounds having an aromatic skeleton such as hydroquinone divinyl ether; vinyl ester compounds such as vinyl acetate, vinyl butyrate, isopropenyl acetate, vinyl caprate, and vinyl benzoate; unsaturated alcohols such as allyl alcohol and cinnamic alcohol; conjugated diene compounds such as 1,3-butadiene, isoprene, 1,3-pentadiene, 1,3-hexadiene, 1,3-cyclohexadiene, 1,3-cycloheptadiene, 1,
- acrylate compound examples include monofunctional acrylate compounds, difunctional acrylate compounds, and trifunctional or higher polyfunctional acrylate compounds.
- Examples of monofunctional acrylate compounds include alkyl acrylates such as acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, n-pentyl acrylate, isopentyl acrylate, tert-pentyl acrylate, neopentyl acrylate, hexyl acrylate, octyl acrylate, dodecyl acrylate, and stearyl acrylate, benzyl acrylate, and alkoxy acrylate.
- alkyl acrylates such as acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl
- butylphenol (butylphenol, octylphenol, nonylphenol, dodecylphenol, etc.), acrylates of ethylene oxide adducts, isobornyl acrylate, cyclohexyl acrylate, tricyclodecane monomethylol acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate, hydroxypentyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate , 2-hydroxy-3-butoxypropyl acrylate, 2-hydroxy-3-methoxypropyl acrylate, diethylene glycol monoacrylate, diethylene glycol monoethyl ether acrylate, triethylene glycol monoacrylate, triethylene glycol monoethyl ether acrylate, tetraethylene glycol monoacrylate, tetraethylene glycol monoethyl ether acrylate, polyethylene
- Bifunctional acrylate compounds include ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol diacrylate, propylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, polypropylene glycol diacrylate, butylene glycol diacrylate, pentyl glycol diacrylate, neopentyl glycol diacrylate, hydroxypivalyl hydroxypivalate diacrylate, hydroxypivalyl hydroxypivalate dicaprolactonate diacrylate, 1,6-hexanediol diacrylate, 1,2-hexanedi diacrylate, 1,5-hexanediol diacrylate, 2,5-hexanediol diacrylate, 1,7-heptanediol diacrylate, 1,8-octanediol diacrylate, 1,2-octanedi
- polyfunctional acrylate compounds include glycerin triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, trimethylolpropane tricaprolactonate triacrylate, trimethylolethane triacrylate, trimethylolhexane triacrylate, trimethyloloctane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol tetracaprolactonate tetraacrylate, diglycerin tetraacrylate, and ditrimethylolpropane tetraacrylate.
- acrylate ditrimethylolpropane tetracaprolactonate tetraacrylate, ditrimethylolethane tetraacrylate, ditrimethylolbutane tetraacrylate, ditrimethylolhexane tetraacrylate, ditrimethyloloctane tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, tripentaerythritol hexaacrylate, tripentaerythritol heptaacrylate, tripentaerythritol octaacrylate, and tripentaerythritol polyalkylene oxide heptaacrylate.
- Other examples include polyfunctional acrylate compounds such as urethane acrylate and polyester acrylate.
- Methacrylate compounds include, for example, monofunctional methacrylate compounds, difunctional methacrylate compounds, and trifunctional or higher polyfunctional methacrylate compounds.
- Examples of monofunctional methacrylate compounds include methacrylic acid, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, n-pentyl methacrylate, isopentyl methacrylate, tert-pentyl methacrylate, neopentyl methacrylate, hexyl methacrylate, octyl methacrylate, dodecyl methacrylate, stearyl methacrylate and other alkyl methacrylates, benzyl methacrylate, and alkylphenols.
- Bifunctional methacrylate compounds include ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate, polypropylene glycol dimethacrylate, butylene glycol dimethacrylate, pentyl glycol dimethacrylate, neopentyl glycol dimethacrylate, hydroxypivalyl hydroxypivalate dimethacrylate, hydroxypivalyl hydroxypivalate dicaprolactonate dimethacrylate, 1,6-hexanediol dimethacrylate, 1,2-hexanediol dimethacrylate, acrylate, 1,5-hexanediol dimethacrylate, 2,5-hexanediol dimeth
- Multifunctional methacrylate compounds include glycerin trimethacrylate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane trimethacrylate, trimethylolpropane tricaprolactonate trimethacrylate, trimethylolethane trimethacrylate, trimethylolhexane trimethacrylate, trimethyloloctane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, pentaerythritol tetracaprolactonate tetramethacrylate, diglycerin tetramethacrylate, ditrimethylolpropane tetramethacrylate, acrylate, ditrimethylolpropane tetracaprolactonate tetramethacrylate, ditrimethylolethane tetramethacrylate, ditrimethylolbutane
- examples of isocyanurate compounds that can be used as crosslinking agents include polyfunctional (meth)acryloyl group-containing isocyanurates such as tri(acryloyloxyethyl)isocyanurate, tri(methacryloyloxyethyl)isocyanurate, alkylene oxide-added tri(acryloyloxyethyl)isocyanurate, and alkylene oxide-added tri(methacryloyloxyethyl)isocyanurate; and polyfunctional allyl group-containing isocyanurates such as triallyl isocyanurate.
- polyfunctional (meth)acryloyl group-containing isocyanurates such as tri(acryloyloxyethyl)isocyanurate, tri(methacryloyloxyethyl)isocyanurate, alkylene oxide-added tri(acryloyloxyethyl)isocyanurate
- polyfunctional allyl group-containing isocyanurates such
- crosslinking agents that can be suitably used herein include the following: polyethylene glycol diacrylate (manufactured by Toagosei Co., Ltd., product name: "Aronix (registered trademark) M-240”), trimethylolpropane PO-modified triacrylate (manufactured by Toagosei Co., Ltd., product name: "Aronix (registered trademark) M-321”), ethoxylated trimethylolpropane triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: "NK Ester A-TMPT-3EO”), trimethylolpropane triacrylate (manufactured by Toagosei Co., Ltd., product name: "Aronix (registered trademark) M-309”), triethylene glycol divinyl
- isocyanuric acid modified ethylene oxide diacrylate and isocyanuric acid modified ethylene oxide triacrylate include aryl ether
- the content of the crosslinking agent is preferably 1 mass part or more, more preferably 2 mass parts or more, even more preferably 3 mass parts or more, particularly preferably 4 mass parts or more, preferably 50 mass parts or less, more preferably 35 mass parts or less, even more preferably 30 mass parts or less, particularly preferably 20 mass parts or less, relative to 100 mass parts of the total of polymer A and polymer B described below. If the content of the crosslinking agent is within the above range, a better effect of expanding the exposure margin, an effect of suppressing the occurrence of top loss, and an effect of reducing the amount of resist residue can be obtained. Furthermore, if the content of the crosslinking agent is within the above range, the obtained resist pattern can have a higher resolution.
- the content of the crosslinking agent can be further optimized according to the functionality of the crosslinking agent.
- the content of the crosslinking agent is preferably 5 parts by mass or more and 50 parts by mass or less, with the total of the polymer A and the polymer B being 100 parts by mass.
- the content of the crosslinking agent is preferably 4 parts by mass or more and 40 parts by mass or less, with respect to the total of the polymer A and the polymer B being 100 parts by mass.
- the content of the crosslinking agent is preferably 3 parts by mass or more and 30 parts by mass or less, with respect to the total of the polymer A and the polymer B being 100 parts by mass. If the content of the crosslinking agent with a predetermined functionality is within the above range, a better effect of expanding the exposure margin, an effect of suppressing the occurrence of top loss, and an effect of reducing the amount of resist residue can be obtained. Furthermore, if the content of the crosslinking agent with a predetermined functionality is within the above range, the obtained resist pattern can be made high-resolution.
- the polymer A contained in the resist composition of the present invention is not particularly limited as long as the surface free energy is 3 mJ / m 2 or more higher than the surface energy of the polymer B. From the viewpoint of obtaining a good exposure margin expansion effect, a top loss occurrence suppression effect, and an effect of reducing the amount of resist residue, it is preferable that the polymer A is a main chain scission type polymer.
- the term "main chain scission type" refers to a polymer in which the main chain is scissed and the molecular weight is reduced by irradiation of exposure light such as ionizing radiation such as an electron beam or non-ionizing radiation with a wavelength of 300 nm or less.
- Such a polymer is not particularly limited, and for example, those described in JP-B-8-3636, JP-A-2020-134683, WO 2019/150966, and WO 2020/066806 can be used.
- the polymer A is preferably a compound represented by the following formula (I):
- R 1 is a halogen atom, a cyano group, an alkylsulfonyl group, an alkoxy group, a nitro group, an acyl group, an alkyl ester group, or a halogenated alkyl group
- R 2 is an organic group having hydrogen atoms or 0 to 20 fluorine atoms
- R 3 and R 4 are hydrogen atoms, halogen atoms, unsubstituted alkyl groups, or alkyl groups substituted with halogen atoms, and may be the same or different from each other.
- the monomer unit (I) is represented by the following formula (a): (In the formula (a), R 1 to R 4 are the same as those in the formula (I)).
- halogen atoms which may constitute R 1 , R 3 and R 4 in formula (I) and formula (a) include a chlorine atom, a fluorine atom, a bromine atom and an iodine atom.
- alkylsulfonyl group which may constitute R 1 in formula (I) and formula (a) include a methylsulfonyl group, an ethylsulfonyl group, and the like.
- alkoxy group which may constitute R 1 in formula (I) and formula (a) include a methoxy group, an ethoxy group, and a propoxy group.
- Examples of the acyl group which may constitute R 1 in formula (I) and formula (a) include a formyl group, an acetyl group, and a propionyl group.
- alkyl ester group which may constitute R 1 in formula (I) and formula (a) include a methyl ester group, an ethyl ester group, and the like.
- halogenated alkyl groups which may constitute R 1 in formula (I) and formula (a) include halogenated methyl groups having 1 to 3 halogen atoms.
- the organic group having 0 to 20 fluorine atoms that can constitute R2 in formula (I) and formula (a) may have an aromatic ring or may be chain-like.
- chain-like includes straight chain and branched chain.
- organic groups include fluoroalkyl groups, fluoroalkoxyalkyl groups, and fluoroalkoxyalkenyl groups such as fluoroethoxyvinyl groups.
- Examples of the unsubstituted alkyl group which can constitute R 3 and R 4 in formula (I) and formula (a) include unsubstituted alkyl groups having 1 to 10 carbon atoms.
- alkyl group substituted with a halogen atom which may constitute R3 and R4 in formula (I) and formula (a) include groups having a structure in which some or all of the hydrogen atoms in an alkyl group are substituted with the above-mentioned halogen atoms.
- the monomer (a) is not particularly limited, and examples thereof include ⁇ -chloroacrylic acid fluoroesters such as 2,2,2-trifluoroethyl ⁇ -chloroacrylate, 2,2,3,3,3-pentafluoropropyl ⁇ -chloroacrylate, 3,3,4,4,4-pentafluorobutyl ⁇ -chloroacrylate, 1H-1-(trifluoromethyl)trifluoroethyl ⁇ -chloroacrylate, 1H,1H,3H-hexafluorobutyl ⁇ -chloroacrylate, 1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl ⁇ -chloroacrylate, and 2,2,3,3,4,4,4-heptafluorobutyl ⁇ -chloroacrylate.
- ⁇ -chloroacrylic acid fluoroesters such as 2,2,2-trifluoroethyl ⁇ -chloroacrylate, 2,2,3,
- alkyl esters ⁇ -chloroacrylic acid fluoroalkoxyalkyl esters such as ⁇ -chloroacrylic acid pentafluoroethoxymethyl ester and ⁇ -chloroacrylic acid pentafluoroethoxyethyl ester; ⁇ -chloroacrylic acid fluoroalkoxyalkenyl esters such as ⁇ -chloroacrylic acid pentafluoroethoxyvinyl ester; ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl, ⁇ -chloroacrylic acid-1-phenyl-2,2,2-trifluoroethyl, ⁇ -chloroacrylic acid-1-phenyl-2,2,3,3,3-pentafluoropropyl, etc.
- polymer A When polymer A has monomer unit (I), polymer A may have any monomer unit other than monomer unit (I).
- the polymer A is a compound represented by the following formula (II):
- L is a divalent linking group having a fluorine atom
- Ar is an aromatic ring group which may have a substituent
- R5 is a halogen atom, a cyano group, an alkylsulfonyl group, an alkoxy group, a nitro group, an acyl group, an alkyl ester group or a halogenated alkyl group
- R6 and R7 are a hydrogen atom, a halogen atom, an unsubstituted alkyl group or an alkyl group substituted with a halogen atom, and may be the same or different from each other.
- copolymer A may have any monomer unit other than monomer unit (II) and monomer unit (III), but the total proportion of monomer unit (II) and monomer unit (III) in all monomer units constituting copolymer A is preferably 90 mol% or more, and more preferably 100 mol% (i.e., copolymer A has only monomer unit (II) and monomer unit (III)).
- the above-mentioned copolymer A may be, for example, a random copolymer, a block copolymer, an alternating copolymer, or the like, so long as it has the monomer unit (II) and the monomer unit (III), but is preferably an alternating copolymer.
- an alternating copolymer is, for example, a copolymer in which the above-mentioned monomer unit (II) and monomer unit (III) are alternately bonded.
- the individual monomer units are bonded as "(II)-(III)-(II)-(III)-".
- copolymer A contains monomer units (II) and (III), when it is irradiated with exposure light, the main chain is cut and the molecular weight is reduced.
- the monomer unit (II) is represented by the following formula (b): In the formula (b), L, Ar, and R 5 to R 7 are the same as those in the formula (II).
- divalent linking groups having fluorine atoms that may constitute L in formula (II) and formula (b) include divalent chain alkyl groups having 1 to 5 carbon atoms and having fluorine atoms.
- the aromatic ring group which may have a substituent and which may constitute Ar in formula (II) and formula (b) includes an aromatic hydrocarbon ring group which may have a substituent, and an aromatic heterocyclic group which may have a substituent.
- Aromatic hydrocarbon ring groups include, but are not limited to, a benzene ring group, a biphenyl ring group, a naphthalene ring group, an azulene ring group, an anthracene ring group, a phenanthrene ring group, a pyrene ring group, a chrysene ring group, a naphthacene ring group, a triphenylene ring group, an o-terphenyl ring group, an m-terphenyl ring group, a p-terphenyl ring group, an acenaphthene ring group, a coronene ring group, a fluorene ring group, a fluoranthene ring group, a pentacene ring group, a perylene ring group, a pentaphene ring group, a picene ring group, a pyranthrene ring group,
- Aromatic heterocyclic groups include, but are not limited to, a furan ring group, a thiophene ring group, a pyridine ring group, a pyridazine ring group, a pyrimidine ring group, a pyrazine ring group, a triazine ring group, an oxadiazole ring group, a triazole ring group, an imidazole ring group, a pyrazole ring group, a thiazole ring group, an indole ring group, a benzimidazole ring group, a benzothiazole ring group, a benzoxazole ring group, a quinoxaline ring group, a quinazoline ring group, a phthalazine ring group, a benzofuran ring group, a dibenzofuran ring group, a benzothiophene ring group, a dibenzothiophene ring group
- the substituents that Ar may have include, but are not limited to, alkyl groups, fluorine atoms, and fluoroalkyl groups.
- alkyl groups that Ar may have as substituents include linear alkyl groups having 1 to 6 carbon atoms, such as methyl groups, ethyl groups, propyl groups, n-butyl groups, and isobutyl groups.
- fluoroalkyl groups that Ar may have as substituents include fluoroalkyl groups having 1 to 5 carbon atoms, such as trifluoromethyl groups, trifluoroethyl groups, and pentafluoropropyl groups.
- Ar in formula (II) and formula (b) is preferably an aromatic hydrocarbon ring group which may have a substituent, more preferably an unsubstituted aromatic hydrocarbon ring group, and even more preferably a benzene ring group (phenyl group).
- halogen atoms which may constitute R5 in formula (II) and formula (b) include the same atoms as the halogen atoms which may constitute R1 in formula (I) and formula (a).
- Alkylsulfonyl groups which may constitute R5 in formula (II) and formula (b) include the same groups as the alkylsulfonyl groups which may constitute R1 in formula (I) and formula (a).
- Alkoxy groups which may constitute R5 in formula (II) and formula (b) include the same groups as the alkoxy groups which may constitute R1 in formula (I) and formula (a).
- acyl groups which may constitute R5 in formulae (II) and (b) include the same acyl groups as those which may constitute R1 in formulae (I) and (a).
- Alkyl ester groups which may constitute R5 in formula (II) and formula (b) include the same groups as the alkyl ester groups which may constitute R1 in formula (I) and formula (a).
- halogenated alkyl groups which may constitute R5 in formula (II) and formula (b) include the same groups as the halogenated alkyl groups which may constitute R1 in formula (I) and formula (a).
- halogen atoms which may constitute R 6 and R 7 in formulae (II) and (b) include the same atoms as the halogen atoms which may constitute R 1 in formulae (I) and (a).
- the unsubstituted alkyl groups which may constitute R6 and R7 in formula (II) and formula (b) include the same groups as the unsubstituted alkyl groups which may constitute R3 and R4 in formula (I) and formula (a).
- alkyl groups substituted with halogen atoms which may constitute R6 and R7 in formula (II) and formula (b) include the same groups as the alkyl groups substituted with halogen atoms which may constitute R3 and R4 in formula (I) and formula (a).
- the monomer (b) represented by formula (b) is preferably ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl (ACAFPh) and ⁇ -chloroacrylic acid-1-(4-methoxyphenyl)-1-trifluoromethyl-2,2,2-trifluoroethyl (ACAFPhOMe), and more preferably ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl.
- ACAFPh ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl
- ACAFPhOMe ⁇ -chloroacrylic acid-1-(4-methoxyphenyl)-1-trifluoromethyl-2,2,2-trifluoroethyl
- the copolymer A it is preferable for the copolymer A to have at least one of ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl units and ⁇ -chloroacrylic acid-1-(4-methoxyphenyl)-1-trifluoromethyl-2,2,2-trifluoroethyl units, and more preferably ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl units.
- the proportion of monomer units (II) in copolymer A is not particularly limited, and can be, for example, 30 mol % or more and 70 mol % or less, assuming that the total monomer units in copolymer A are 100 mol %.
- the monomer unit (III) is represented by the following formula (c): In the formula (c), R 8 to R 12 , p and q are the same as those in the formula (III).
- halogen atoms that may constitute R 8 , R 11 and R 12 in formula (III) and formula (c) include the same atoms as the halogen atoms that may constitute R 1 in formula (I) and formula (a).
- alkyl group that can constitute the unsubstituted alkyl group that can constitute R8 , R11 , and R12 in formula (III) and formula (c) include the same groups as the unsubstituted alkyl groups that can constitute R3 and R4 in formula (I) and formula (a).
- the unsubstituted alkyl group that can constitute R8 is preferably a methyl group or an ethyl group.
- alkyl group substituted with a halogen atom which may constitute R8 , R11 , and R12 in formula (III) and formula (c) include the same groups as the alkyl group substituted with a halogen atom which may constitute R3 and R4 in formula (I) and formula (a).
- halogen atoms that may constitute R9 in formula (III) and formula (c) include the same atoms as the halogen atoms that may constitute R1 in formula (I) and formula (a). Among them, the halogen atom is preferably a fluorine atom.
- Examples of the unsubstituted alkyl group that may constitute R9 in formula (III) and formula (c) include the same groups as the unsubstituted alkyl groups that may constitute R3 and R4 in formula (I) and formula (a).
- alkyl group substituted with a halogen atom which may constitute R9 in formula (III) and formula (c) examples include the same groups as the alkyl groups substituted with a halogen atom which may constitute R3 and R4 in formula (I) and formula (a).
- Examples of the unsubstituted alkyl group which may constitute R10 in formula (III) and formula (c) include the same groups as the unsubstituted alkyl groups which may constitute R3 and R4 in formula (I) and formula (a).
- alkyl group substituted with a halogen atom which may constitute R10 in formula (III) and formula (c) examples include the same groups as the alkyl groups substituted with a halogen atom which may constitute R3 and R4 in formula (I) and formula (a).
- each R 9 may be the same as or different from each other.
- each R 10 may be the same as or different from each other.
- R 8 in formula (III) and formula (c) is preferably an alkyl group having 1 to 5 carbon atoms, and more preferably a methyl group.
- p in formula (III) and formula (c) is 0 or 1.
- R 9 in formula (III) and formula (c) is preferably an alkyl group having 1 to 5 carbon atoms, and more preferably a methyl group.
- the monomer (c) represented by formula (c) is not particularly limited, and examples thereof include ⁇ -methylstyrene (AMS) and its derivatives, such as the following monomers (c-1) to (c-12).
- AMS ⁇ -methylstyrene
- copolymer A preferably has ⁇ -methylstyrene units.
- the proportion of monomer units (I) in copolymer A is not particularly limited, and can be 30 mol % or more and 70 mol % or less, assuming that the total monomer units in copolymer A are 100 mol %.
- the surface free energy of polymer A is preferably 28 mJ/ m2 or more, more preferably 29 mJ/ m2 or more, and even more preferably 30 mJ/ m2 or more, and is preferably 35 mJ/ m2 or less, more preferably 34 mJ/ m2 or less, and even more preferably 33 mJ/ m2 or less.
- the surface free energy of the polymer A can be adjusted by the types and ratio of the monomer units constituting the polymer A.
- the weight average molecular weight (Mw) of the polymer A is preferably 100,000 or more, more preferably 125,000 or more, preferably 150,000 or more, more preferably 600,000 or less, and more preferably 500,000 or less. If the weight average molecular weight of the polymer A is the above lower limit or more, the occurrence of top loss can be further suppressed, and a resist pattern with further improved contrast can be formed. In addition, if the weight average molecular weight of the polymer A is the above upper limit or less, the resist composition can be easily prepared.
- the number average molecular weight (Mn) of the polymer A is preferably 100,000 or more, more preferably 110,000 or more, and is preferably 300,000 or less, and more preferably 200,000 or less. If the number average molecular weight of the polymer A is equal to or more than the lower limit, the occurrence of top loss can be further suppressed, and a resist pattern with further improved contrast can be formed. If the number average molecular weight of the polymer A is equal to or less than the upper limit, the resist composition can be more easily prepared.
- the molecular weight distribution of polymer A is preferably 1.20 or more, more preferably 1.25 or more, and even more preferably 1.30 or more, and is preferably 2.00 or less, more preferably 1.80 or less, and even more preferably 1.60 or less.
- the "molecular weight distribution” can be determined by calculating the ratio of the weight average molecular weight to the number average molecular weight (Mw/Mn).
- the "weight average molecular weight” and the "number average molecular weight” can be measured using gel permeation chromatography in terms of standard polystyrene.
- Method for preparing polymer A There is no particular limitation on the method for preparing the polymer A.
- a method for preparing the copolymer A having the above-mentioned monomer unit (II) and monomer unit (III) as the polymer A will be specifically described, but the polymer A used in the resist composition of the present invention and the method for preparing the same are not limited to those shown below.
- the copolymer A having the monomer unit (II) and the monomer unit (III) can be prepared by polymerizing a monomer composition containing the above-mentioned monomer (b), monomer (c), and any monomer copolymerizable with these monomers, and then recovering the obtained copolymer A and optionally purifying it.
- the weight average molecular weight, number average molecular weight and molecular weight distribution of the copolymer A can be adjusted by changing the polymerization conditions and purification conditions. Specifically, for example, the weight average molecular weight and number average molecular weight can be increased by shortening the polymerization time. Furthermore, the molecular weight distribution can be narrowed by performing purification.
- the monomer composition used in the preparation of copolymer A may be a mixture of monomer components including monomer (b) and monomer (c), an optional polymerization initiator, and an optional additive.
- the polymerization of the monomer composition may be carried out using a known method. Among them, it is preferable to use cyclopentanone, water, or the like as the solvent. It is also preferable to use, for example, azobisisobutyronitrile, or the like as the polymerization initiator.
- the polymer obtained by polymerizing the monomer composition can be recovered by adding a good solvent such as tetrahydrofuran to a solution containing the polymer, without any particular limitations, and then dripping the solution with the good solvent into a poor solvent such as methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, or hexane to solidify the polymer.
- a good solvent such as tetrahydrofuran
- a poor solvent such as methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, or hexane
- the purification method used for purifying the obtained polymer is not particularly limited, and examples thereof include known purification methods such as reprecipitation and column chromatography. Among them, the reprecipitation method is preferably used as the purification method. The purification of the polymer may be repeated several times.
- the purification of the polymer by the reprecipitation method is preferably carried out, for example, by dissolving the obtained polymer in a good solvent such as tetrahydrofuran, and then dripping the obtained solution into a mixed solvent of a good solvent such as tetrahydrofuran and a poor solvent such as methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, hexane, etc., to precipitate a part of the polymer.
- a good solvent such as tetrahydrofuran
- a poor solvent such as methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, hexane, etc.
- the molecular weight distribution, number average molecular weight, and weight average molecular weight of the obtained copolymer A can be easily adjusted by changing the type and mixing ratio of the good solvent and poor solvent.
- the molecular weight of the copolymer A precipitated in the mixed solvent can be increased by increasing the proportion of the good solvent in the mixed solvent.
- the polymer precipitated in a mixed solvent of a good solvent and a poor solvent may be used as copolymer A as long as it satisfies the desired properties, or the polymer that did not precipitate in the mixed solvent (i.e., the polymer that is dissolved in the mixed solvent) may be used.
- the polymer that did not precipitate in the mixed solvent can be recovered from the mixed solvent using a known method such as concentration to dryness.
- Polymer B there are no particular limitations on polymer B contained in the resist composition of the present invention, so long as its surface free energy is at least 3 mJ/ m2 lower than the surface free energy of polymer A. From the viewpoint of obtaining a favorable effect of expanding the exposure margin, an effect of suppressing the occurrence of top loss, and an effect of reducing the amount of resist residue, polymer B is preferably a main chain cleavage type polymer.
- the polymer B is preferably a polymer represented by the following formula (I):
- R 1 is a halogen atom, a cyano group, an alkylsulfonyl group, an alkoxy group, a nitro group, an acyl group, an alkyl ester group, or a halogenated alkyl group
- R 2 is an organic group having hydrogen atoms or 0 to 20 fluorine atoms
- R 3 and R 4 are hydrogen atoms, halogen atoms, unsubstituted alkyl groups, or alkyl groups substituted with halogen atoms, and may be the same or different from each other.
- polymer B when polymer B has monomer unit (I), polymer B may have any monomer unit other than monomer unit (I).
- the polymer B is a polymer represented by the following formula (IV):
- R 13 is a halogen atom, a cyano group, an alkylsulfonyl group, an alkoxy group, a nitro group, an acyl group, an alkyl ester group, or a halogenated alkyl group
- R 14 is an organic group having hydrogen atoms or 0 to 20 fluorine atoms
- R 15 and R 16 are hydrogen atoms, halogen atoms, unsubstituted alkyl groups, or alkyl groups substituted with halogen atoms, and may be the same or different from each other.
- R 17 , R 20 , and R 21 are hydrogen atoms, halogen atoms, unsubstituted
- copolymer B may have any monomer unit other than monomer unit (IV) and monomer unit (V), but the proportion of monomer unit (IV) and monomer unit (V) in the total monomer units constituting copolymer B is preferably 70 mol% or more, and more preferably 100 mol% (i.e., copolymer B has only monomer unit (IV) and monomer unit (V)).
- An example of an arbitrary monomer unit other than monomer unit (IV) and monomer unit (V) that copolymer B may have is the above-mentioned monomer unit (II).
- the copolymer B may be, for example, a random copolymer, a block copolymer, an alternating copolymer, or a ternary alternating copolymer, as long as it has the monomer unit (IV) and the monomer unit (V), but is preferably an alternating copolymer or a ternary alternating copolymer.
- a ternary alternating copolymer is, for example, an alternating copolymer having the above-mentioned monomer unit (II) in addition to the monomer unit (IV) and the monomer unit (V), in which the monomer unit (IV) or the monomer unit (V) is copolymerized between the monomer units (II).
- the individual monomer units are bonded as "-(II)-(IV)-(V)-(IV)-(II)".
- copolymer B contains monomer units (IV) and (V), when it is irradiated with exposure light, the main chain is cut and the molecular weight is reduced.
- the monomer unit (IV) has the following formula (d): In the formula (d), R 13 to R 16 are the same as R 13 to R 16 in the formula (IV).
- examples of halogen atoms that can constitute R 13 in formula (IV) and formula (d) include the same atoms as those that can constitute R 1 in formula (I) and formula (a).
- the halogen atom that can constitute R 13 is preferably a chlorine atom.
- alkylsulfonyl group which may constitute R 13 in formula (IV) and formula (d) include the same groups as the alkylsulfonyl groups which may constitute R 1 in formula (I) and formula (a).
- alkoxy groups which may constitute R 13 in formulae (IV) and (d) include the same alkoxy groups as those which may constitute R 1 in formulae (I) and (a).
- acyl groups which may constitute R 13 in formulae (IV) and (d) include the same acyl groups as those which may constitute R 1 in formulae (I) and (a).
- alkyl ester groups which may constitute R 13 in formula (IV) and formula (d) include the same alkyl ester groups as may constitute R 1 in formula (I) and formula (a).
- halogenated alkyl groups which may constitute R 13 in formula (IV) and formula (d) include the same groups as the halogenated alkyl groups which may constitute R 1 in formula (I) and formula (a).
- the organic group having 0 to 20 fluorine atoms that can constitute R 14 in formula (IV) and formula (d) can be exemplified by the same groups as the organic group having 0 to 20 fluorine atoms that can constitute R 2 in formula (I) and formula (a), but preferably does not have an aromatic ring, and more preferably is chain-like.
- the carbon number of R 14 is preferably 2 to 10, more preferably 5 or less. If the carbon number of R 14 is the above lower limit or more, the solubility in the developer can be sufficiently improved. In addition, if the carbon number of R 14 is the above upper limit or less, the clarity of the resist pattern can be sufficiently guaranteed.
- R 14 in formula (IV) and formula (d) is preferably a fluoroalkyl group, a fluoroalkoxyalkyl group, or a fluoroalkoxyalkenyl group, and more preferably a fluoroalkyl group.
- R 14 is the above-mentioned group, the scission property of the main chain of polymer B when irradiated with ionizing radiation or the like can be sufficiently improved.
- fluoroalkyl group examples include a 2,2,3,3,3-pentafluoropropyl group (having 5 fluorine atoms and 3 carbon atoms), a 3,3,4,4,4-pentafluorobutyl group (having 5 fluorine atoms and 4 carbon atoms), a 1H-1-(trifluoromethyl)trifluoroethyl group (having 6 fluorine atoms and 3 carbon atoms), a 1H,1H,3H-hexafluorobutyl group (having 6 fluorine atoms and 4 carbon atoms), a 2,2,3,3,4,4,4-heptafluorobutyl group (having 7 fluorine atoms and 4 carbon atoms), and a 1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl group (having 7 fluorine atoms and 3 carbon atoms).
- a 2,2,3,3,3-pentafluoropropyl group (having 5 fluorine atoms and 3 carbon atoms) or a 2,2,3,3,4,4,4-heptafluorobutyl group (having 7 fluorine atoms and 4 carbon atoms) is preferred, and a 2,2,3,3,3-pentafluoropropyl group (having 5 fluorine atoms and 3 carbon atoms) is more preferred.
- the fluoroalkoxyalkyl group include a fluoroethoxymethyl group and a fluoroethoxyethyl group.
- examples of the fluoroalkoxyalkenyl group include a fluoroethoxyvinyl group.
- halogen atoms which may constitute R 15 and R 16 in formulae (IV) and (d) include the same atoms as the halogen atoms which may constitute R 1 in formulae (I) and (a).
- Examples of the unsubstituted alkyl groups which may constitute R 15 and R 16 in formula (IV) and formula (d) include the same groups as the unsubstituted alkyl groups which may constitute R 3 and R 4 in formula (I) and formula (a).
- alkyl group substituted with a halogen atom which may constitute R 15 and R 16 in formula (IV) and formula (d) include the same groups as the alkyl group substituted with a halogen atom which may constitute R 3 and R 4 in formula (I) and formula (a).
- Examples of the monomer (d) include ⁇ -chloroacrylic acid fluoroalkyl esters such as ⁇ -chloroacrylic acid 2,2,3,3,3-pentafluoropropyl, ⁇ -chloroacrylic acid 3,3,4,4,4-pentafluorobutyl, ⁇ -chloroacrylic acid 1H-1-(trifluoromethyl)trifluoroethyl, ⁇ -chloroacrylic acid 1H,1H,3H-hexafluorobutyl, ⁇ -chloroacrylic acid 1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl, and ⁇ -chloroacrylic acid 2,2,3,3,4,4,4-heptafluorobutyl; ⁇ -chloroacrylic acid fluoroalkoxyalkyl esters such as ⁇ -chloroacrylic acid pentafluoroethoxymethyl ester and ⁇ -chloroacrylic acid pentafluor
- ⁇ -chloroacrylic acid fluoroalkyl esters are preferred from the viewpoint of improving sensitivity to ionizing radiation, etc.
- the proportion of monomer units (IV) in copolymer B is not particularly limited, and can be, for example, 30 mol % or more and 70 mol % or less, assuming that the total monomer units in copolymer B are 100 mol %.
- the monomer unit (V) has the following formula (e): In the formula (e), R 17 to R 21 , r and s are the same as those in the formula (V).
- halogen atoms which may constitute R 17 , R 20 and R 21 in formula (V) and formula (e) include the same atoms as the halogen atoms which may constitute R 1 in formula (I) and formula (a).
- Examples of the unsubstituted alkyl group which may constitute R17 , R20 , and R21 in formula (V) and formula (e) include the same groups as the unsubstituted alkyl groups which may constitute R3 and R4 in formula (I) and formula (a). Among them, the unsubstituted alkyl group which may constitute R17 in formula (V) and formula (e) is preferably a methyl group or an ethyl group.
- Examples of the alkyl group substituted with a halogen atom which may constitute R 17 , R 20 , and R 21 in formula (V) and formula (e) include the same groups as the alkyl group substituted with a halogen atom which may constitute R 3 and R 4 in formula (I) and formula (a).
- halogen atoms which may constitute R 18 in formula (V) and formula (e) include the same atoms as the halogen atoms which may constitute R 1 in formula (I) and formula (a).
- halogenated carboxyl groups which may constitute R 18 in formula (V) and formula (e) include the same groups as the halogenated carboxyl groups which may constitute R 9 in formula (III) and formula (c).
- Examples of the unsubstituted alkyl group which may constitute R18 in formula (V) and formula (e) include the same groups as the unsubstituted alkyl groups which may constitute R3 and R4 in formula (I) and formula (a).
- alkyl group substituted with a halogen atom which may constitute R18 in formula (V) and formula (e) include the same groups as the alkyl groups substituted with a halogen atom which may constitute R3 and R4 in formula (I) and formula (a).
- Examples of the unsubstituted alkyl group which may constitute R19 in formula (V) and formula (e) include the same groups as the unsubstituted alkyl groups which may constitute R3 and R4 in formula (I) and formula (a).
- alkyl group substituted with a halogen atom which may constitute R19 in formula (V) and formula (e) include the same groups as the alkyl groups substituted with a halogen atom which may constitute R3 and R4 in formula (I) and formula (a).
- each R 18 when r is 2 or more, each R 18 may be the same as or different from each other. When s is 2 or more, each R 19 may be the same as or different from each other.
- R 18 and/or R 19 are all preferably a hydrogen atom or an unsubstituted alkyl group, more preferably a hydrogen atom or an unsubstituted alkyl group having 1 to 5 carbon atoms, and further preferably a hydrogen atom.
- the monomer (e) represented by formula (e) is not particularly limited, and examples thereof include the following monomers (e-1) to (e-11) such as ⁇ -methylstyrene (AMS) and its derivatives (e.g., 4-fluoro- ⁇ -methylstyrene: 4FAMS).
- AMS ⁇ -methylstyrene
- 4FAMS 4-fluoro- ⁇ -methylstyrene
- polymer B preferably has ⁇ -methylstyrene units or 4-fluoro- ⁇ -methylstyrene units.
- the proportion of monomer units (V) in copolymer B is not particularly limited, and can be, for example, 30 mol% to 70 mol% or less, assuming that the total monomer units in copolymer B are 100 mol%.
- the surface free energy of polymer B is preferably 18 mJ/ m2 or more, more preferably 19 mJ/m2 or more , and even more preferably 20 mJ/m2 or more , and is preferably 27 mJ/ m2 or less, more preferably 26 mJ/ m2 or less, and even more preferably 25 mJ/ m2 or less.
- the surface free energy of the polymer B can be adjusted by the types and ratio of the monomer units constituting the polymer B.
- the weight average molecular weight (Mw) of the polymer B is preferably 10000 or more, more preferably 17000 or more, even more preferably 25000 or more, and preferably 250000 or less, more preferably 180000 or less, and even more preferably 50000 or less. If the weight average molecular weight of the copolymer B is the above lower limit or more, it is possible to suppress the solubility of the resist film in the developer from excessively increasing at a low irradiation dose. In addition, if the weight average molecular weight of the polymer B is the above upper limit or less, it is possible to easily prepare a resist composition.
- the number average molecular weight (Mn) of polymer B is preferably 7000 or more, more preferably 10000 or more, and preferably 150000 or less.
- Mn number average molecular weight
- the number average molecular weight of polymer B is the above lower limit or more, it is possible to further suppress excessive increase in the solubility of the resist film in the developer at a low irradiation dose.
- the number average molecular weight of polymer B is the above upper limit or less, it is possible to more easily prepare the resist composition.
- the molecular weight distribution (Mw/Mn) of polymer B is preferably 1.10 or more, more preferably 1.20 or more, and preferably 1.70 or less, and more preferably 1.65 or less.
- Mw/Mn molecular weight distribution
- polymer B can be easily prepared.
- the molecular weight distribution of polymer B is the above upper limit or less, the contrast of the obtained resist pattern can be further increased.
- the content of polymer B in the resist composition is preferably 1% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, and preferably 49% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less, when the total of polymer A and polymer B contained in the resist composition is taken as 100% by mass. If the content of polymer B in the resist composition is the above lower limit or more, the sensitivity to ionizing radiation and the like can be improved. Furthermore, if the content of polymer B in the resist composition is the above upper limit or less, the effect of reducing the amount of resist residue is further enhanced.
- Method for preparing polymer B There is no particular limitation on the method for preparing the polymer B.
- a method for preparing the copolymer B having the above-mentioned monomer unit (IV) and monomer unit (V) as the polymer B will be specifically described, but the polymer B used in the resist composition of the present invention and the method for preparing the same are not limited to those shown below.
- the copolymer B having the monomer unit (IV) and the monomer unit (V) can be prepared by polymerizing a monomer composition containing the above-mentioned monomer (d), monomer (e), and any monomer copolymerizable with these monomers, and then recovering the resulting copolymer and optionally purifying it.
- the polymerization method and purification method are not particularly limited, and can be the same as the method described in the above section "Method of preparing polymer A.”
- the solvent used in the resist composition of the present invention is not particularly limited as long as it is a solvent capable of dissolving the above-mentioned polymer A and polymer B, and any known solvent can be used. Among them, from the viewpoint of improving the coatability of the resist composition, it is preferable to use anisole, propylene glycol monomethyl ether acetate (PGMEA), cyclopentanone, cyclohexanone, or isoamyl acetate as the solvent.
- the solvent may be used alone or in combination of two or more kinds.
- the resist composition of the present invention may further contain any known additives that can be blended into resist compositions.
- the amount of additives blended is not particularly limited, and an appropriate amount can be added depending on the application.
- the resist composition can be prepared by mixing the above-mentioned predetermined crosslinking agent, polymer A, polymer B, a solvent, and additives that can be added optionally.
- the mixing method is not particularly limited, and the components may be mixed by a known method.
- the resist composition may also be prepared by mixing each component and then filtering the mixture.
- the method of filtering the mixture is not particularly limited, and for example, the mixture can be filtered using a filter.
- the filter is not particularly limited, and examples thereof include fluorocarbon, cellulose, nylon, polyester, and hydrocarbon filtration membranes.
- the material constituting the filter is preferably polyfluorocarbon such as polyethylene, polypropylene, polytetrafluoroethylene, Teflon (registered trademark), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), nylon, and a composite membrane of polyethylene and nylon.
- polyfluorocarbon such as polyethylene, polypropylene, polytetrafluoroethylene, Teflon (registered trademark), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), nylon, and a composite membrane of polyethylene and nylon.
- PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
- nylon a composite membrane of polyethylene and nylon.
- the filter disclosed in U.S. Pat. No. 6,103,122 may be used.
- the filter may be commercially available as Zeta Plus (registered trademark) 40Q manufactured by CUNO Incorporated.
- the filter may contain a strong cationic or weak cationic ion exchange resin.
- the average particle size of the ion exchange resin is not particularly limited, but is preferably 2 ⁇ m or more and 10 ⁇ m or less.
- the cation exchange resin include sulfonated phenol-formaldehyde condensates, sulfonated phenol-benzaldehyde condensates, sulfonated styrene-divinylbenzene copolymers, sulfonated methacrylic acid-divinylbenzene copolymers, and other types of sulfonic acid or carboxylic acid group-containing polymers.
- the cation exchange resin is provided with H + counterions, NH 4 + counterions, or alkali metal counterions, such as K + and Na + counterions.
- the cation exchange resin preferably has a hydrogen counterion.
- Examples of such cation exchange resins include Microlite® PrCH from Purolite, which is a sulfonated styrene-divinylbenzene copolymer having an H + counterion.
- Such cation exchange resins are commercially available as AMBERLYST® from Rohm and Haas.
- the pore size of the filter is preferably 0.001 ⁇ m or more and 1 ⁇ m or less. If the pore size of the filter is within the above range, it is possible to sufficiently prevent impurities such as metals from being mixed into the resist composition.
- the method for forming a resist pattern of the present invention includes a resist film forming step of coating a substrate with a resist composition containing a crosslinking agent that reacts with ionizing radiation or nonionizing radiation having a wavelength of 300 nm or less, a solvent, a polymer A, and a polymer B to obtain a coating layer, and removing the solvent from the coating layer to form a resist film, and an exposure step of exposing the resist film formed in the resist film forming step to ionizing radiation or nonionizing radiation having a wavelength of 300 nm or less as exposure light to form a latent image pattern while promoting a crosslinking reaction by the crosslinking agent.
- the method for forming a resist pattern of the present invention may further include a step of developing the latent image pattern obtained in the exposure step (developing step), a step of heating the resist film between the exposure step and the development step (post-exposure bake step), and/or a step of washing and removing the developer after the development step (rinsing step).
- developing step a step of developing the latent image pattern obtained in the exposure step
- post-exposure bake step a step of heating the resist film between the exposure step and the development step
- rinse and removing the developer after the development step resisting step
- the resist film forming process includes a step (coating step) of applying a specific resist composition onto a workpiece, such as a substrate, to be processed using the resist pattern to obtain a coating layer, and then a step (drying step) of removing the solvent from the obtained coating layer to form a resist film.
- the workpiece to which the predetermined resist composition is applied in the coating step is not particularly limited, and examples of the workpiece include a semiconductor substrate used in the manufacture of semiconductor devices, a substrate having an insulating layer and a copper foil provided on the insulating layer, and a mask blank having a light-shielding layer formed on a substrate, which are used in the manufacture of printed circuit boards, etc.
- the method for applying the resist composition is not particularly limited, and any known method can be used.
- the predetermined resist composition to be applied onto the workpiece the above-mentioned resist composition of the present invention can be suitably used.
- the method for removing the solvent from the coating layer is not particularly limited, and any drying method commonly used in forming a resist film can be used. However, it is preferable to form a resist film by heating (pre-baking) the resist composition.
- the temperature at which the coating layer is dried is preferably 100° C. or higher, more preferably 110° C. or higher, from the viewpoint of adhesion between the resist film formed through the drying process and the workpiece, and is preferably 250° C. or lower, more preferably 200° C. or lower, from the viewpoint of reducing the thermal influence on the workpiece and the resist film.
- the time at which the coating layer is dried is preferably more than 10 seconds, more preferably 30 seconds or higher, and even more preferably 1 minute or higher, from the viewpoint of sufficiently improving the adhesion between the resist film formed by carrying out the drying process in a lower temperature range and the workpiece, and is preferably 60 minutes or lower, more preferably 30 minutes or lower, from the viewpoint of reducing the change in the molecular weight of the polymer A and the polymer B in the resist film before and after the drying process.
- Exposure process In the exposure step, a desired pattern is drawn by irradiating predetermined locations of the resist film formed in the resist film formation step with exposure light, which is ionizing radiation or non-ionizing radiation with a wavelength of 300 nm or less. Irradiation with exposure light creates poorly soluble parts A and easily soluble parts B in the resist film to form a latent image pattern. In addition, in the exposure step, a latent image pattern is formed while a crosslinking reaction by a crosslinking agent is allowed to proceed.
- exposure light which is ionizing radiation or non-ionizing radiation with a wavelength of 300 nm or less. Irradiation with exposure light creates poorly soluble parts A and easily soluble parts B in the resist film to form a latent image pattern.
- a latent image pattern is formed while a crosslinking reaction by a crosslinking agent is allowed to proceed.
- the crosslinking reaction and the main chain scission reaction of the polymer A and/or the polymer B proceed in parallel. In this case, it is more advantageous in terms of expanding the exposure margin.
- ionizing radiation is radiation that has enough energy to ionize atoms or molecules.
- non-ionizing radiation is radiation that does not have enough energy to ionize atoms or molecules.
- ionizing radiation examples include electron beams, extreme ultraviolet rays, gamma rays, X-rays, alpha rays, heavy particle beams, proton beams, beta rays, and ion beams.
- electron beams or extreme ultraviolet rays are preferred as ionizing radiation, and electron beams are more preferred.
- the wavelength of extreme ultraviolet rays is not particularly limited and can be, for example, 1 nm or more and 30 nm or less, and is preferably 13.5 nm.
- Non-ionizing radiation with a wavelength of 300 nm or less includes, for example, far ultraviolet rays excluding extreme ultraviolet rays (wavelength: 40 nm or more and 200 nm or less), near ultraviolet rays (wavelength: more than 200 nm and 300 nm or less).
- far ultraviolet rays excluding extreme ultraviolet rays (wavelength: 40 nm or more and 200 nm or less)
- near ultraviolet rays wavelength: more than 200 nm and 300 nm or less.
- KrF excimer laser rays wavelength: 248 nm
- ArF excimer laser rays wavelength: 193 nm
- the amount of irradiation in the exposure step is not particularly limited, but is usually 10 mJ/cm 2 or more and 3000 mJ/cm 2 or less, and when an electron beam (EB) is used, it is usually 0.1 ⁇ C/cm 2 or more and 1000 ⁇ C/cm 2 or less.
- a known exposure device such as an electron beam drawing device or a laser drawing device can be used.
- a post-exposure bake step of heating the resist film after the exposure step can be optionally carried out.
- the heating temperature is not particularly limited, but from the viewpoint of sufficiently suppressing the occurrence of unevenness in the resist pattern, it is preferably 80° C. or higher, and more preferably 100° C. or higher, and from the viewpoint of suppressing the generation of gas due to decomposition of the resist film by heat, it is preferably 160° C. or lower, and more preferably 140° C. or lower.
- the time for which the resist film is heated in the post-exposure bake step is not particularly limited, but from the viewpoint of sufficiently suppressing the occurrence of unevenness in the resist pattern, it is preferably 30 seconds or more, and more preferably 1 minute or more, and from the viewpoint of production efficiency, it is preferably 20 minutes or less, and more preferably 10 minutes or less.
- the method for heating the resist film in the post-exposure bake step is not particularly limited, and examples include a method of heating the resist film on a hot plate, a method of heating the resist film in an oven, and a method of blowing hot air onto the resist film.
- the latent image pattern of the resist film that has been subjected to the exposure step or post-exposure bake step is developed to form a developed film on the workpiece.
- the development of the resist film can be carried out, for example, by contacting the resist film with a developer.
- the method of contacting the resist film with the developer is not particularly limited, and known methods such as immersing the resist film in the developer or applying the developer to the resist film can be used.
- the developer can be appropriately selected depending on the properties of the above-mentioned polymer A and polymer B.
- the developer it is preferable to select a developer that does not dissolve the resist film before the exposure step is performed, but can dissolve the easily soluble portion B of the resist film that has been subjected to the exposure step or the post-exposure bake step.
- the developer is not particularly limited, and examples thereof include hydrofluorocarbons such as 1,1,1,2,3,4,4,5,5,5-decafluoropentane (CF 3 CFHCFHCF 2 CF 3 ), 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane, 1,1,1,2,2,3,4,5,5,5-decafluoropentane, 1,1,1,3,3-pentafluorobutane, and 1,1,1,2,2,3,3,4,4-nonafluorohexane; 2,2-dichloro-1,1,1-trifluoroethane, 1,1-dichloro-1-fluoroethane, and 1,1-dichloro-2,2,3,3,3-pentafluoropropane
- Fluorine-based solvents such as perfluorocarbons such as C 7 F 14 , C 7 F 16 , C 8 F 18 , and C 9 F 20 ; alcohols such as methanol, ethanol, 1-propanol, 2-propanol (isopropyl alcohol), 1-butanol, 2-butanol, 1-pentanol, 2-pentanol, and 3-pentanol; acetates having an alkyl group such as amyl acetate and hexyl acetate; mixtures of fluorine-based solvents and alcohols; mixtures of fluorine-based solvents and acetates having an alkyl group; mixtures of alcohols and acetates having an alkyl group; mixtures of fluorine-based solvents, alcohols, and acetates having an alkyl group; and the like can be used.
- alcohols such as methanol, ethanol, 1-propanol, 2-propanol (isopropyl alcohol), 1-but
- the developer since the contrast of the resist pattern can be further increased.
- the developer may be used alone or in a mixture of two or more kinds at any ratio.
- a step of removing the developer may be carried out after the development step.
- the developer may be removed, for example, by using a rinse solution.
- the rinse liquid is not particularly limited as long as it does not dissolve the resist pattern, and a solution containing water or a general organic solvent can be used.
- a rinse liquid it is preferable to select a rinse liquid that is easily mixed with the developer.
- this test piece After irradiating this test piece with 400 uC/ cm2 of a 50 keV electron beam, it was immersed in the same type of solvent as that used in preparing the crosslinking agent solution at room temperature (23°C) for 1 minute and dried. The thickness T2 of the dried test piece was measured, and if the value of T2 / T1 x 100% was 50% or more, the crosslinking agent was judged to "react with ionizing radiation or nonionizing radiation having a wavelength of 300 nm or less". The results of evaluation of the various crosslinking agents used in the examples are shown in Table 1.
- the weight average molecular weight (Mw) and number average molecular weight (Mn) of copolymer A1 and copolymer B1 were determined in terms of standard polystyrene using a gel permeation chromatograph (HLC-8220, manufactured by Tosoh Corporation) and tetrahydrofuran as a developing solvent, and the molecular weight distribution (Mw/Mn) was calculated.
- the surface free energy was measured using the copolymers A1, B1 and B2 prepared in Preparation Examples. Specifically, first, copolymer A1, copolymer B1, and copolymer B2 were each dissolved in isoamyl acetate as a solvent to prepare a positive resist composition with a concentration of 3% by mass. Next, using a spin coater (MS-A150, manufactured by Mikasa Co., Ltd.), the positive resist composition was applied to a silicon wafer with a diameter of 4 inches to a thickness of 50 nm. Next, the applied positive resist composition was heated on a hot plate at a temperature of 170° C. for 1 minute to form a film (resist film) on the silicon wafer.
- MS-A150 spin coater
- the contact angles of two types of solvents (water and diiodomethane) with known surface tension, polar term (p), and dispersion force term (d) were measured under the following conditions using a contact angle meter (Drop Master 700, manufactured by Kyowa Interface Science Co., Ltd.), and the surface free energy was evaluated by the Owens-Wendt (extended Fowkes equation) method, and the surface free energy of the film (resist film) was calculated.
- an optical film thickness meter Libda Ace, manufactured by SCREEN Semiconductor Solutions
- the sensitivity curve obtained (horizontal axis: common logarithm of the total dose of electron beam, vertical axis: residual film ratio of resist film (0 ⁇ remaining film ratio ⁇ 1.00)) was fitted to a quadratic function in the range of residual film ratio of 0.30 to 0.80, and a straight line (an approximation line of the slope of the sensitivity curve) connecting the point of residual film ratio 0 and the point of residual film ratio 0.50 on the obtained quadratic function (a function of residual film ratio and common logarithm of total dose) was created.
- the total dose of electron beam E th ( ⁇ C/cm 2 ) when the residual film ratio of the obtained straight line (a function of residual film ratio and common logarithm of total dose) was 0 was determined.
- E 0 is the logarithm of the total irradiation amount obtained when fitting the sensitivity curve to a quadratic function in the range of the residual film ratio of 0.30 to 0.80, and substituting the residual film ratio of 0 for the obtained quadratic function (a function of the residual film ratio and the common logarithm of the total irradiation amount).
- E 1 is the logarithm of the total irradiation amount obtained when creating a straight line (an approximation line of the slope of the sensitivity curve) connecting the point of the residual film ratio of 0 and the point of the residual film ratio of 0.50 on the obtained quadratic function, and substituting the residual film ratio of 1.00 for the obtained straight line (a function of the residual film ratio and the common logarithm of the total irradiation amount).
- the formula below represents the slope of the straight line between the residual film ratios of 0 and 1.00. The larger the ⁇ value, the larger the slope of the sensitivity curve, indicating that a pattern with high clarity can be formed well.
- ELS-S50 electron beam lithography device
- E op optimum exposure dose
- the optimum exposure dose was appropriately set, with a value approximately twice that of E th as a guide.
- the electron beam written wafer was immersed in isopropyl alcohol (IPA) as a resist developer at 23° C. for 1 minute to perform a development process. The developer was then removed by nitrogen blowing to form a line and space pattern (half pitch: 25 nm).
- IPA isopropyl alcohol
- the resist residue was evaluated using the positive resist compositions obtained in the examples and comparative examples. Specifically, the resist pattern formed in the evaluation of the above-mentioned ⁇ remaining film ratio> was observed at a magnification of 100,000 times using a scanning electron microscope (SEM), and the extent to which the residue remained in the resist pattern was evaluated according to the following criteria. The results are shown in Table 1. The residue remaining in the resist pattern can be confirmed in the SEM image as a high-luminance "dot" or the like compared to the line pattern area where no residue is attached. The smaller the residue in the resist pattern, the higher the contrast of the resist pattern. A: No residue was observed in the hp25 nm resist pattern. B: There is a very small amount of residue in the hp 25 nm resist pattern, but it is within the acceptable range. C: A large amount of residue was observed in the hp 25 nm resist pattern, which is outside the allowable range.
- THF tetrahydrofuran
- MeOH methanol
- the obtained polymer was dissolved in 10 g of THF, and the obtained solution was dropped into 100 g of a mixed solvent of THF and MeOH (THF:MeOH (mass ratio) 34:66) to precipitate a white coagulant.
- the obtained copolymer A1 contained 54 mol% of ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl units and 46 mol% of ⁇ -methylstyrene units.
- this copolymer A1 had a weight average molecular weight (Mw) of 382253, a number average molecular weight (Mn) of 259380, a molecular weight distribution (Mw/Mn) of 1.474, and a surface free energy of 31 mJ/ m2 .
- the temperature was returned to room temperature, and the glass container was opened to the atmosphere, and then 10 g of THF was added to the obtained solution.
- the solution to which THF was added was then dropped into 100 g of MeOH as a solvent to precipitate a polymer.
- the solution containing the precipitated polymer was then filtered using a Kiriyama funnel to obtain a polymer.
- the obtained polymer was dissolved in 100 g of THF, and the obtained solution was dropped into 100 g of a mixed solvent of THF and MeOH [THF:MeOH (mass ratio) 20:80] to precipitate a white coagulant.
- the obtained copolymer B1 contained 50 mol% each of ⁇ -chloroacrylic acid 2,2,3,3,3-pentafluoropropyl units and ⁇ -methylstyrene units.
- this copolymer B1 had a weight average molecular weight (Mw) of 49556, a number average molecular weight (Mn) of 35806, a molecular weight distribution (Mw/Mn) of 1.384, and a surface free energy of 24.2 mJ/m 2 .
- the obtained copolymer B2 contained 10 mol% of ⁇ -chloroacrylic acid-1-phenyl-1-trifluoromethyl-2,2,2-trifluoroethyl units, 40 mol% of ⁇ -chloroacrylic acid-2,2,3,3,3-pentafluoropropyl units, and 50 mol% of ⁇ -methylstyrene units.
- this copolymer B2 had a weight average molecular weight (Mw) of 53546, a number average molecular weight (Mn) of 30129, a molecular weight distribution (Mw/Mn) of 1.777, and a surface free energy of 26.1 mJ/m 2 .
- Example 1 Preparation of Resist Composition>
- the polymer A 80 parts of the copolymer A1 prepared as above, as the polymer B, 20 parts of the copolymer B1 prepared as above, 10 parts of polyethylene glycol diacrylate (manufactured by Toa Gosei Co., Ltd., product name "Anilox (registered trademark) M-240") as the crosslinking agent C1, and 5000 parts of isoamyl acetate as the solvent were mixed to obtain a mixed solution.
- the obtained mixed solution was filtered through a membrane filter with a pore size of 20 nm to prepare a resist composition.
- the difference in surface free energy between the polymer A and the polymer B was 3 mJ/ m2 or more.
- Example 2 In preparing the resist composition, the mass ratio of polymer A, polymer B, and crosslinking agent in the resist composition (polymer A1:polymer B1:crosslinking agent C1) was changed to 80:20:20 (Example 2), 80:20:30 (Example 3), 90:10:20 (Example 4), 70:30:20 (Example 5), and 70:30:40 (Example 6). Otherwise, the resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Example 7 In preparing the resist composition, trimethylolpropane PO modified triacrylate (manufactured by Toagosei Co., Ltd., product name: "Aronix (registered trademark) M-321") was used as crosslinking agent C2 instead of crosslinking agent C1.
- the mass ratio of polymer A, polymer B, and crosslinking agent in the resist composition was changed to 80:20:10. Except for this, a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Example 8 In preparing the resist composition, a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (manufactured by Toagosei Co., Ltd., product name: "Aronix (registered trademark) M-403" was used as crosslinking agent C3 instead of crosslinking agent C1.
- the mass ratio of polymer A, polymer B, and crosslinking agent in the resist composition (polymer A:polymer B:crosslinking agent C3) was changed to 80:20:10.
- a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Example 9 In preparing the resist composition, a mixture of isocyanuric acid ethylene oxide modified diacrylate and isocyanuric acid ethylene oxide modified triacrylate (manufactured by Toagosei Co., Ltd., product name: "Aronix (registered trademark) M-315") was used as crosslinking agent C4 instead of crosslinking agent C1.
- the mass ratio of polymer A, polymer B, and crosslinking agent in the resist composition (polymer A:polymer B:crosslinking agent C4) was changed to 80:20:10.
- a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Example 10 In preparing the resist composition, triallyl isocyanurate (Mitsubishi Chemical Corporation, product name: "TAIC”) was used as crosslinking agent C5 instead of crosslinking agent C1.
- TAIC triallyl isocyanurate
- the mass ratio of polymer A, polymer B, and crosslinking agent in the resist composition was changed to 80:20:10.
- a resist composition was prepared in the same manner as in Example 1 except for this, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Example 11 In preparing the resist composition, copolymer B2 was used instead of copolymer B1 as polymer B. Except for this, a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Example 12 In preparing the resist composition, copolymer B2 was used instead of copolymer B1 as polymer B. Except for this, a resist composition was prepared in the same manner as in Example 10, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 1 In preparing the resist composition, polymer B and a crosslinking agent were not blended. Except for this, a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 2 In preparing the resist composition, Copolymer A and a crosslinking agent were not blended. Except for this, a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 3 In preparing the resist composition, copolymer A and a crosslinking agent were not blended. In addition, polymer B2 was used instead of polymer B1 as polymer B. Except for this, a resist composition was prepared in the same manner as in Example 1, a resist pattern was formed, and various evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.
- A1 represents copolymer A1;
- B1 indicates copolymer B1;
- B2 indicates copolymer B2;
- C1 represents polyethylene glycol diacrylate;
- C2 represents trimethylolpropane PO modified triacrylate;
- C3 represents a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate;
- C4 represents a mixture of isocyanuric acid ethylene oxide modified diacrylate and isocyanuric acid ethylene oxide modified triacrylate;
- C5" represents triallyl isocyanurate;
- PAB indicates a pre-bake step,
- SFE(A) indicates the surface free energy of copolymer A,
- SFE(B) indicates the surface free energy of copolymer B,
- PEB refers to a post-exposure bake step;
- IPA refers to isopropyl alcohol.
- Table 1 show that in Examples 1 to 12, which used resist compositions containing a crosslinker that reacts with ionizing radiation or non-ionizing radiation with a wavelength of 300 nm or less, polymer A, and polymer B (the difference in surface free energy between polymer A and polymer B is 3 mJ/ m2 or more), the exposure margin of the resist film was wide, and the obtained resist patterns suppressed the occurrence of top loss and had a reduced amount of resist residue.
- Comparative Example 1 in which polymer B and a crosslinking agent were not blended, and Comparative Examples 2 and 3 in which polymer A and a crosslinking agent were not blended, it was found that it was not possible to effectively achieve all of the effects of expanding the exposure margin of the resist film, suppressing the occurrence of top loss, and reducing the amount of resist residue.
- the present invention provides a resist composition and a method for forming a resist pattern that can form a resist pattern with a wide exposure margin, suppressed top loss, and reduced amounts of resist residue.
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Abstract
Cette composition de résinse photosensible contient un agent de réticulation qui réagit avec un rayonnement ionisant ou un rayonnement non ionisant ayant une longueur d'onde inférieure ou égale à 300 nm, un solvant, un polymère A et un polymère B, l'énergie libre de surface du polymère A étant supérieure à l'énergie de surface du polymère B, et la différence entre l'énergie libre de surface du polymère A et l'énergie libre de surface du polymère B étant supérieure ou égale à 3 mJ/m2.
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WO2016035633A1 (fr) * | 2014-09-01 | 2016-03-10 | 富士フイルム株式会社 | Composition de blindage de lumière infrarouge, filtre de coupure de lumière infrarouge, et élément d'imagerie à semi-conducteur |
JP2018025687A (ja) * | 2016-08-10 | 2018-02-15 | 東洋インキScホールディングス株式会社 | 感光性着色組成物およびカラーフィルタ |
WO2022190714A1 (fr) * | 2021-03-09 | 2022-09-15 | 日本ゼオン株式会社 | Composition de résine photosensible positive et procédé de formation de motif de résine photosensible |
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WO2016035633A1 (fr) * | 2014-09-01 | 2016-03-10 | 富士フイルム株式会社 | Composition de blindage de lumière infrarouge, filtre de coupure de lumière infrarouge, et élément d'imagerie à semi-conducteur |
JP2018025687A (ja) * | 2016-08-10 | 2018-02-15 | 東洋インキScホールディングス株式会社 | 感光性着色組成物およびカラーフィルタ |
WO2022190714A1 (fr) * | 2021-03-09 | 2022-09-15 | 日本ゼオン株式会社 | Composition de résine photosensible positive et procédé de formation de motif de résine photosensible |
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