WO2014196425A1 - レジスト組成物 - Google Patents
レジスト組成物 Download PDFInfo
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- WO2014196425A1 WO2014196425A1 PCT/JP2014/064083 JP2014064083W WO2014196425A1 WO 2014196425 A1 WO2014196425 A1 WO 2014196425A1 JP 2014064083 W JP2014064083 W JP 2014064083W WO 2014196425 A1 WO2014196425 A1 WO 2014196425A1
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- 0 CC*CC=CC=C(C=*)N(c1ccccc1)c1ccccc1 Chemical compound CC*CC=CC=C(C=*)N(c1ccccc1)c1ccccc1 0.000 description 6
- BXRVCUCHDSNFJZ-UHFFFAOYSA-N CC(C)(c(cc1I)cc(C)c1O)c(cc1I)cc(C)c1O Chemical compound CC(C)(c(cc1I)cc(C)c1O)c(cc1I)cc(C)c1O BXRVCUCHDSNFJZ-UHFFFAOYSA-N 0.000 description 1
- XQDHUYMPQCZTMK-UHFFFAOYSA-N CC(C)Cc1ccc(C(c(cc(C(c2ccc(CC(C)C)cc2)c(cc(C(c2ccc(CC(C)C)cc2)c(cc(C2c3ccc(CC(C)C)cc3)c(O)c3)c3O)c(O)c3)c3O)c(O)c3)c3O)c(c(O)c3)cc2c3O)cc1 Chemical compound CC(C)Cc1ccc(C(c(cc(C(c2ccc(CC(C)C)cc2)c(cc(C(c2ccc(CC(C)C)cc2)c(cc(C2c3ccc(CC(C)C)cc3)c(O)c3)c3O)c(O)c3)c3O)c(O)c3)c3O)c(c(O)c3)cc2c3O)cc1 XQDHUYMPQCZTMK-UHFFFAOYSA-N 0.000 description 1
- GSBWFSYHFUZYGD-UHFFFAOYSA-N CC(C)c1ccc(C(c(cc(C(c2ccc(C(C)C)cc2)c(cc(C(c2ccc(C(C)C)cc2)c(cc(C2c3ccc(C(C)C)cc3)c(O)c3)c3O)c(O)c3)c3O)c(O)c3)c3O)c(c(O)c3)cc2c3O)cc1 Chemical compound CC(C)c1ccc(C(c(cc(C(c2ccc(C(C)C)cc2)c(cc(C(c2ccc(C(C)C)cc2)c(cc(C2c3ccc(C(C)C)cc3)c(O)c3)c3O)c(O)c3)c3O)c(O)c3)c3O)c(c(O)c3)cc2c3O)cc1 GSBWFSYHFUZYGD-UHFFFAOYSA-N 0.000 description 1
- AUGXDIVLKCKNPE-UHFFFAOYSA-N CCCc1ccc(C(c(cc(C(c2ccc(CCC)cc2)c(cc(C(c2ccc(CCC)cc2)c(cc(C2c3ccc(CCC)cc3)c(O)c3)c3O)c(O)c3)c3O)c(O)c3)c3O)c(c(O)c3)cc2c3O)cc1 Chemical compound CCCc1ccc(C(c(cc(C(c2ccc(CCC)cc2)c(cc(C(c2ccc(CCC)cc2)c(cc(C2c3ccc(CCC)cc3)c(O)c3)c3O)c(O)c3)c3O)c(O)c3)c3O)c(c(O)c3)cc2c3O)cc1 AUGXDIVLKCKNPE-UHFFFAOYSA-N 0.000 description 1
- MLJMETFUZGAQBC-UHFFFAOYSA-N C[N](c(cccc1)c1OC)(N)N Chemical compound C[N](c(cccc1)c1OC)(N)N MLJMETFUZGAQBC-UHFFFAOYSA-N 0.000 description 1
- PZNXLDWYIYIKMO-UHFFFAOYSA-N Cc1cc(C(CC2)(CCC2(c(cc2[IH]I)cc(C)c2O)c(cc2I)cc(I)c2O)c(cc2I)cc(I)c2O)cc(I)c1O Chemical compound Cc1cc(C(CC2)(CCC2(c(cc2[IH]I)cc(C)c2O)c(cc2I)cc(I)c2O)c(cc2I)cc(I)c2O)cc(I)c1O PZNXLDWYIYIKMO-UHFFFAOYSA-N 0.000 description 1
- CQQGRAWMMYCSML-OMPYBTNPSA-N Oc1c(C(c2ccc(C3CCCCC3)cc2)c(c(O)c2)cc([C@H](c3ccc(C4CCCCC4)cc3)c(c(O)c3)cc([C@H](c4ccc(C5CCCCC5)cc4)c(c(O)c4)cc(C5c6ccc(C7CCCCC7)cc6)c4O)c3O)c2O)cc5c(O)c1 Chemical compound Oc1c(C(c2ccc(C3CCCCC3)cc2)c(c(O)c2)cc([C@H](c3ccc(C4CCCCC4)cc3)c(c(O)c3)cc([C@H](c4ccc(C5CCCCC5)cc4)c(c(O)c4)cc(C5c6ccc(C7CCCCC7)cc6)c4O)c3O)c2O)cc5c(O)c1 CQQGRAWMMYCSML-OMPYBTNPSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
-
- 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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0382—Macromolecular compounds which are rendered insoluble or differentially wettable the macromolecular compound being present in a chemically amplified negative photoresist composition
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—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
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0395—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having a backbone with alicyclic moieties
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- 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
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2059—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a scanning corpuscular radiation beam, e.g. an electron beam
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/322—Aqueous alkaline compositions
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
Definitions
- the present invention relates to a resist composition and a resist pattern forming method using the composition.
- a conventional general resist material is a polymer material capable of forming an amorphous thin film.
- a resist thin film is prepared by applying a solution of a polymer resist material such as polymethyl methacrylate, polyhydroxystyrene having an acid-dissociable reactive group, or polyalkyl methacrylate on a substrate.
- a line pattern of about 45 to 100 nm is formed by irradiating the resist thin film with ultraviolet rays, far ultraviolet rays, electron beams, extreme ultraviolet rays (EUV), X-rays and the like.
- ultraviolet rays far ultraviolet rays
- EUV extreme ultraviolet rays
- the polymer resist has a large molecular weight of about 10,000 to 100,000 and a wide molecular weight distribution. Therefore, in lithography using a polymer resist, roughness is generated on the surface of the fine pattern, making it difficult to control the pattern dimension and lowering the yield. Therefore, there is a limit to miniaturization in conventional lithography using a polymer resist material, and various low molecular weight resist materials have been proposed in order to produce finer patterns.
- an alkali developing negative radiation-sensitive composition using a low molecular weight cyclic polyphenol compound as a main component has been proposed (for example, see Patent Document 3 and Non-Patent Document 1). Since these low molecular weight cyclic polyphenol compounds have a low molecular weight, it is expected to provide a resist pattern having a small molecular size, high resolution, and low roughness. Further, the low molecular weight cyclic polyphenol compound has a rigid cyclic structure in its skeleton, and thus provides high heat resistance despite its low molecular weight.
- the negative radiation-sensitive compositions described in Patent Documents 1 and 2 have drawbacks that the heat resistance is not sufficient and the shape of the resulting resist pattern is also deteriorated.
- the cyclic phenol compound described in Patent Document 3 although a good pattern can be obtained, substance properties such as solubility characteristics are slightly unstable, and a good pattern shape cannot be obtained stably.
- low molecular weight cyclic polyphenol compounds currently known including those described in Non-Patent Document 1 have low solubility in a safe solvent used in a semiconductor manufacturing process, low sensitivity, and a resist pattern shape obtained. There is a problem such as poorness, and improvement of a low molecular weight cyclic polyphenol compound is desired.
- the present invention has been made in view of the problems of the prior art, and provides a resist composition having high solubility in a safe solvent, high sensitivity, low roughness, and stably providing a good resist pattern shape.
- the purpose is to do.
- the present inventors have found that a resist composition using a cyclic compound composed of a specific stereoisomer as the main component of the resist substrate and using a specific cyclic compound as the second component is obtained. Surprisingly, it has been found that it is effective in solving the above problems. That is, it has been found that the above resist composition has high solubility in a safe solvent, high sensitivity, low roughness, and a stable resist pattern shape that can be stably obtained.
- a resist composition containing a solid component including a resist substrate and a solvent The solid component in the resist composition is in the range of 1 to 80% by mass, the solvent is in the range of 20 to 99% by mass,
- the resist substrate contains a compound (ctt body) represented by the following formula (1) and a compound represented by the following formula (3),
- the proportion of the compound (ctt body) represented by the following formula (1) in the resist base is 65 to 99% by mass, and the following formula (ctt body) represented by the following formula (1)
- a resist composition wherein the mass ratio of the compound represented by 3) is 0.01 to 0.53.
- each R is independently a hydrogen atom, a substituted or unsubstituted heterocyclic group, a halogen atom, a substituted or unsubstituted linear aliphatic hydrocarbon group having 1 to 20 carbon atoms, Substituted or unsubstituted branched aliphatic hydrocarbon group having 3 to 20 carbon atoms, substituted or unsubstituted cyclic aliphatic hydrocarbon group having 3 to 20 carbon atoms, substituted or unsubstituted aryl group having 6 to 20 carbon atoms A substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, a substituted or unsubstituted carbon number
- R ′ and X are each independently a hydrogen atom, a hydroxyl group, a cyano group, a nitro group, a substituted or unsubstituted heterocyclic group, a halogen atom, A substituted or unsubstituted linear aliphatic hydrocarbon group having 1 to 20 carbon atoms, a substituted or unsubstituted branched aliphatic hydrocarbon group having 3 to 20 carbon atoms, a substituted or unsubstituted carbon group having 3 to 20 carbon atoms Cyclic aliphatic hydrocarbon group, substituted or unsubstituted aryl group having 6 to 20 carbon atoms, substituted or unsubstituted aralkyl group having 7 to 20 carbon atoms, substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, substituted Or an unsubstituted amino group having 0 to 20 carbon atoms, a substituted or unsubstituted alkenyl group
- each R 4 independently represents a hydroxyl group, a cyano group, a nitro group, a substituted or unsubstituted heterocyclic group, a halogen atom, a substituted or unsubstituted straight chain having 1 to 14 carbon atoms.
- Aliphatic hydrocarbon group substituted or unsubstituted branched aliphatic hydrocarbon group having 3 to 14 carbon atoms, substituted cyclic aliphatic hydrocarbon group having 3 to 14 carbon atoms, substituted or unsubstituted 6 to 14 carbon atoms
- the present invention it is possible to provide a resist composition that has high solubility in a safe solvent, high sensitivity, low roughness, and a good resist pattern shape, and a resist pattern forming method using the composition. .
- the resist composition of the present embodiment is a resist composition containing a solid component including a resist base material and a solvent,
- the solid component in the resist composition is in the range of 1 to 80% by mass
- the solvent is in the range of 20 to 99% by mass
- the resist substrate contains a compound (ctt body) represented by the following formula (1) and a compound represented by the following formula (3),
- the proportion of the compound (ctt body) represented by the following formula (1) in the resist base is 65 to 99% by mass, and the following formula (ctt body) represented by the following formula (1) ( The mass ratio of the compound represented by 3) is 0.01 to 0.53.
- the resist composition of the present embodiment is configured as described above, the resist composition has high solubility in a safe solvent, high sensitivity, low roughness, and a stable resist pattern shape can be stably provided. That is, the resist composition of the present embodiment is useful as an acid amplification type low molecular weight resist material.
- each R is independently a hydrogen atom, a substituted or unsubstituted heterocyclic group, a halogen atom, a substituted or unsubstituted linear aliphatic hydrocarbon group having 1 to 20 carbon atoms, Substituted or unsubstituted branched aliphatic hydrocarbon group having 3 to 20 carbon atoms, substituted or unsubstituted cyclic aliphatic hydrocarbon group having 3 to 20 carbon atoms, substituted or unsubstituted aryl group having 6 to 20 carbon atoms A substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, a substituted or unsubstituted carbon number
- R is as defined above.
- R ′ and X are each independently a hydrogen atom, a hydroxyl group, a cyano group, a nitro group, a substituted or unsubstituted heterocyclic group, a halogen atom, A substituted or unsubstituted linear aliphatic hydrocarbon group having 1 to 20 carbon atoms, a substituted or unsubstituted branched aliphatic hydrocarbon group having 3 to 20 carbon atoms, a substituted or unsubstituted carbon group having 3 to 20 carbon atoms Cyclic aliphatic hydrocarbon group, substituted or unsubstituted aryl group having 6 to 20 carbon atoms, substituted or unsubstituted aralkyl group having 7 to 20 carbon atoms, substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, substituted Or an unsubstituted amino group having 0 to
- substitution means that, unless otherwise defined, one or more hydrogen atoms in a functional group are a halogen atom, a hydroxyl group, a cyano group, a nitro group, a heterocyclic group, or a carbon number of 1 -20 linear aliphatic hydrocarbon group, branched aliphatic hydrocarbon group having 3-20 carbon atoms, cyclic aliphatic hydrocarbon group having 3-20 carbon atoms, aryl group having 6-20 carbon atoms, carbon number 7-30 aralkyl groups, alkoxy groups having 1-20 carbon atoms, amino groups having 0-20 carbon atoms, alkenyl groups having 2-20 carbon atoms, acyl groups having 1-20 carbon atoms, alkoxy groups having 2-20 carbon atoms It means substituted with a carbonyl group, an alkyloyloxy group having 1 to 20 carbon atoms, an aryloyloxy group having 7 to 30 carbon atoms, or an alkylsily
- unsubstituted heterocyclic group examples include, but are not limited to, pyridyl group, bipyridyl group, pyrrolidyl group, pyrazolyl group, imidazolyl group, isoxazolyl group, isothiazolyl group, piperidyl group, piperazyl group, morpholyl group, thiomorpholyl group , Triazole group, tetrazole group and the like.
- the substituted heterocyclic group is not particularly limited.
- the unsubstituted straight-chain aliphatic hydrocarbon group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, and a decyl group. , Dodecyl group, hexadecyl group, octadecyl group and the like.
- the substituted linear aliphatic hydrocarbon group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a fluoromethyl group, a 2-hydroxyethyl group, a 3-cyanopropyl group, and a 20-nitrooctadecyl group. It is done.
- the unsubstituted branched aliphatic hydrocarbon group having 3 to 20 carbon atoms is not particularly limited.
- isopropyl group, isobutyl group, tertiary butyl group, neopentyl group, 2-hexyl group, 2-octyl group examples include 2-decyl group, 2-dodecyl group, 2-hexadecyl group, 2-octadecyl group and the like.
- the substituted branched aliphatic hydrocarbon group having 3 to 20 carbon atoms is not particularly limited, and examples thereof include a 1-fluoroisopropyl group and a 1-hydroxy-2-octadecyl group.
- the unsubstituted cyclic aliphatic hydrocarbon group having 3 to 14 carbon atoms is not particularly limited, and examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclooctyl group, a cyclodecyl group, a cyclododecyl group, a cyclohexyl group, and the like.
- a sadecyl group, a cyclooctadecyl group, etc. are mentioned.
- the substituted cyclic aliphatic hydrocarbon group having 3 to 14 carbon atoms is not particularly limited, and examples thereof include 2-fluorocyclopropyl group, 4-cyanocyclohexyl group, 4-methylcyclohexyl group, 4-ethylcyclohexyl group and the like. Can be mentioned.
- the unsubstituted aryl group having 6 to 20 carbon atoms is not particularly limited, and examples thereof include a phenyl group and a naphthyl group.
- the substituted aryl group having 6 to 20 carbon atoms is not particularly limited, and examples thereof include a 4-isopropylphenyl group, a 4-methylphenyl group, and a 6-fluoronaphthyl group.
- the unsubstituted aralkyl group having 7 to 30 carbon atoms is not particularly limited, and examples thereof include a 4-methylphenyl group, a 4-ethylphenyl group, a 6-methylnaphthyl group, and a 2,6-dimethylnaphthyl group.
- the substituted aralkyl group having 7 to 30 carbon atoms is not particularly limited, and examples thereof include a 4-fluoro-3-methylphenyl group.
- the unsubstituted alkoxy group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, an octyloxy group, a decyloxy group, and a dodecyloxy group. Group, hexadecyloxy group, octadecyloxy group and the like.
- the substituted alkoxy group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a chloromethoxy group and a bromoethoxy group.
- the unsubstituted amino group having 0 to 20 carbon atoms is not particularly limited, and examples thereof include an amino group, a methylamino group, a dimethylamino group, an ethylamino group, a diethylamino group, a dipropylamino group, and a dibutylamino group. It is done.
- the substituted amino group having 0 to 20 carbon atoms is not particularly limited, and examples thereof include a chloromethylamino group and a dibromomethylamino group.
- the unsubstituted alkenyl group having 2 to 20 carbon atoms is not particularly limited.
- the substituted alkenyl group having 2 to 20 carbon atoms is not particularly limited, and examples thereof include a chloropropynyl group.
- the unsubstituted acyl group having 1 to 20 carbon atoms is not particularly limited.
- formyl group, acetyl group, propanoyl group, butanoyl group, pentanoyl group, hexanoyl group, octanoyl group, decanoyl group, dodecanoyl group, hexadecanoyl group, hexadecanoyl group, A noyl group, a benzoyl group, etc. are mentioned.
- the substituted acyl group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a chloroacetyl group.
- the unsubstituted alkoxycarbonyl group having 2 to 20 carbon atoms is not particularly limited, and examples thereof include a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, a butoxycarbonyl group, a pentyloxycarbonyl group, a hexyloxycarbonyl group, and an octyloxy group. Examples include carbonyl group, decyloxycarbonyl group, dodecyloxycarbonyl group, hexadecyloxycarbonyl group and the like.
- the substituted alkoxycarbonyl group having 2 to 20 carbon atoms is not particularly limited, and examples thereof include a chloromethoxycarbonyl group.
- the unsubstituted alkyloyloxy group having 1 to 20 carbon atoms is not particularly limited.
- methoxycarbonyloxy group, ethoxycarbonyloxy group, propoxycarbonyloxy group, butoxycarbonyloxy group, pentyloxycarbonyloxy group, hexyl examples include oxycarbonyloxy group, octyloxycarbonyloxy group, decyloxycarbonyloxy group, dodecyloxycarbonyloxy group, hexadecyloxycarbonyloxy group and the like.
- the substituted alkyloyloxy group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a chloromethoxycarbonyloxy group.
- the unsubstituted aryloyloxy group having 7 to 30 carbon atoms is not particularly limited, and examples thereof include a benzoyloxy group and a naphthylcarbonyloxy group.
- the substituted aryloyloxy group having 7 to 30 carbon atoms is not particularly limited, and examples thereof include a chlorobenzoyloxy group.
- the unsubstituted alkylsilyl group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a methylsilyl group, an ethylsilyl group, a propylsilyl group, a butylsilyl group, a pentylsilyl group, a hexylsilyl group, an octylsilyl group, a decylsilyl group, A dodecylsilyl group, a hexadecylsilyl group, an octadecylsilyl group, etc. are mentioned.
- the substituted alkylsilyl group having 1 to 20 carbon atoms is not particularly limited, and examples thereof include a chloromethylsilyl group.
- the molecular weight of the compounds represented by the above formulas (1) and (3) is preferably 500 to 5000, more preferably 800 to 2000, and still more preferably 1000 to 2000. When it is in the above range, the resolution tends to be further improved while maintaining the film forming property necessary for the resist.
- stereoisomer in the present specification will be described.
- Examples of stereoisomers constituting the compounds represented by formula (1) and formula (3) include (ccc) isomer, (ctt) isomer, (cct) isomer, and (tct) isomer.
- an aromatic ring having two ROs is a 16-membered ring oligomer in which a ring is wound via a methine group at the para position of the two ROs.
- each of the substituents attached to the four methine groups has an upward and downward bond, and therefore each has a cis-trans isomer (stereoisomer).
- (Ccc) is a compound having a structure in which a substituent on one methine group is sterically bonded in the cis-cis-cis direction in the clockwise order.
- (Ctt) is a compound having a structure in which a substituent attached to one methine group is sterically bonded in the cis-trans-trans direction in the clockwise order.
- (Cct) is a compound having a structure in which a substituent on one methine group is sterically bonded in the cis-cis-trans direction in the clockwise order.
- (Tct) is a compound having a structure in which a substituent on one methine group is sterically bonded in the trans-cis-trans direction in the clockwise order.
- Calixarene is a non-polymeric phenolic compound. Calixarene was discovered in the 1950s and a synthetic method was devised. Regarding the use of calixarene as a radiation-sensitive composition, calixarene partially protected by acid labile groups has been widely evaluated, especially in positive resist materials. This embodiment is effective in solving the above problems by controlling the multimodal isomer structure distribution of calix [4] resorcinarene in these resist material applications, and has high solubility in a safe solvent. It is possible to stably obtain a good resist pattern shape with high sensitivity and low roughness.
- R is a hydrogen atom from the viewpoint of obtaining a good resist pattern suitable for alkali developability.
- p is 1 in that a good resist pattern with small roughness can be obtained.
- the compound represented by the formula (1) is represented by the formula (X) in that a good resist pattern with high sensitivity, high resolution, and low roughness can be obtained.
- R ′ is preferably represented by the formula (2) from the viewpoint of obtaining a good resist pattern with high sensitivity, high resolution and low roughness. Moreover, it is preferable at the point with the high etching tolerance of the obtained resist pattern.
- each R 4 independently represents a hydroxyl group, a cyano group, a nitro group, a substituted or unsubstituted heterocyclic group, a halogen atom, a substituted or unsubstituted straight chain having 1 to 14 carbon atoms.
- Aliphatic hydrocarbon group substituted or unsubstituted branched aliphatic hydrocarbon group having 3 to 14 carbon atoms, substituted cyclic aliphatic hydrocarbon group having 3 to 14 carbon atoms, substituted or unsubstituted 6 to 14 carbon atoms
- R is a hydrogen atom from the viewpoint of obtaining a good resist pattern suitable for alkali developability.
- the compound represented by the formula (3) has 70 mol% or more of the ctt body or the ccc body.
- the compound represented by the formula (3) is at least one selected from the following compound group in that a good resist pattern with high sensitivity, high resolution and low roughness can be obtained. Moreover, it is preferable at the point with the high etching tolerance of the obtained resist pattern.
- the compounds represented by the formula (1) and the formula (3) are not limited to the following, but for example, from one or more compounds selected from the group consisting of aldehyde compounds (A1) and phenolic compounds (A2). It is obtained by a condensation reaction with one or more compounds selected from the group consisting of
- the aldehyde compound (A1) is a compound having a monovalent group containing 1 to 4 formyl groups and having 2 to 59 carbon atoms, and 1 to 3 phenolic compounds (A2). And a compound having 6 to 15 carbon atoms having a phenolic hydroxyl group.
- the aldehyde compound (A1) has 3 to 59 carbon atoms and has a monovalent group containing 1 to 4 formyl groups, and the aromatic aldehyde compound (A1A) and the aliphatic aldehyde compound. Selected from compound (A1B).
- the aromatic aldehyde compound (A1A) is preferably a benzaldehyde compound having 7 to 24 carbon atoms, for example, a benzaldehyde having 7 to 24 carbon atoms having a substituent containing at least one alicyclic ring or aromatic ring in addition to the aromatic ring of benzaldehyde.
- propylbenzaldehyde, cyclohexylbenz Aldehyde, phenyl benzaldehyde are preferred, propyl benzaldehyde, cyclohexyl benzaldehyde is more preferable.
- the aromatic aldehyde compound (A1A) may have a linear or branched alkyl group having 1 to 4 carbon atoms, a cyano group, a hydroxyl group, a halogen or the like as long as the effects of the present embodiment are not impaired.
- the aromatic aldehyde compound (A1A) may be used alone or in combination of two or more.
- the aliphatic aldehyde compound (A1B) may have a cyano group, a hydroxyl group, a halogen or the like as long as the effects of the present embodiment are not impaired.
- the aliphatic aldehyde compound (A1B) may be used alone or in combination of two or more.
- the phenolic compound (A2) preferably has 6 to 15 carbon atoms, and preferably has 1 to 3 phenolic hydroxyl groups.
- the phenolic compound (A2) include, but are not limited to, phenol, catechol, resorcinol, hydroquinone, pyrogallol, 3-methoxyphenol, 3-ethoxyphenol, 3-cyclohexyloxyphenol, 1,3-dimethoxybenzene, 1,3-diethoxybenzene, 1,3-dicyclohexyloxybenzene and the like, resorcinol, pyrogallol, 3-methoxyphenol, 3-ethoxyphenol, 3-cyclohexyloxyphenol, 1,3-dimethoxybenzene, 1, 3-diethoxybenzene and 1,3-dicyclohexyloxybenzene are preferred, and resorcinol is more preferred.
- the phenolic compound (A2) may have a linear or branched alkyl group having 1 to 4 carbon atoms, a cyano group, a hydroxyl group, a halogen or the like as long as the effects of the present embodiment are not impaired. You may use a phenolic compound (A2) individually or in combination of 2 or more types.
- the compounds represented by the above formulas (1) and (3) are not limited to the following, but for example, in the presence of an acid catalyst (hydrochloric acid, sulfuric acid, paratoluenesulfonic acid, etc.) in an organic solvent such as methanol or ethanol. Then, 0.1 to 10 mol of phenolic compound (A2) is reacted at 40 to 150 ° C. for about 0.5 to 20 hours with respect to 1 mol of aldehyde compound (A1), followed by filtration, alcohol such as methanol, etc. It is obtained by drying after washing with water, washing with water, and filtration.
- an acid catalyst hydroochloric acid, sulfuric acid, paratoluenesulfonic acid, etc.
- organic solvent such as methanol or ethanol.
- a basic catalyst such as sodium hydroxide, barium hydroxide or 1,8-diazabicyclo [5.4.0] undecene-7) may be used and reacted in the same manner.
- the compound used in the present embodiment can be produced by converting the aldehyde compound (A1) into a dihalide with hydrogen halide or halogen gas, and reacting the isolated dihalide with the phenolic compound (A2). .
- purification may be performed as necessary.
- the acid catalyst and the cocatalyst remain, generally, the storage stability of the resist composition decreases, or when the basic catalyst remains, generally the sensitivity of the resist composition decreases. May be performed.
- the purification method can be carried out by a known method as long as the compound to be used is not modified, and is not particularly limited.
- a method using recrystallization a method of washing with water, a method of washing with an acidic aqueous solution, a basic aqueous solution
- cleaning with the method of processing with an ion exchange resin, the method of processing with silica gel column chromatography, etc. are mentioned.
- These purification methods are more preferably performed in combination of two or more.
- Acidic aqueous solution, basic aqueous solution, ion exchange resin and silica gel column chromatography are optimal depending on the metal to be removed, the amount and type of acidic compound and basic compound, the type and stereoisomer of the compound to be purified, etc. Can be selected as appropriate.
- Amberlyst 15J-HG Dry manufactured by Organo can be mentioned.
- Drying may be performed after purification. Drying can be performed by a known method, and is not particularly limited. Examples thereof include vacuum drying, hot air drying, and blow drying under conditions where the compound to be used is not denatured.
- the compounds represented by the formulas (1) and (3) can form an amorphous film by spin coating. Further, it can be applied to a general semiconductor manufacturing process.
- the compound represented by the above formulas (1) and (3) is a negative resist material that becomes a compound that is hardly soluble in a developer by irradiation with KrF excimer laser, extreme ultraviolet light, electron beam or X-ray.
- KrF excimer laser extreme ultraviolet light
- electron beam or X-ray a condensation reaction between the compounds is induced, and the compound is hardly soluble in an alkali developer.
- the resist pattern thus obtained has a very small LER (line edge roughness).
- the compounds represented by the above formulas (1) and (3) can be used as a main component of a negative resist composition, and for example, a resist composition as an additive for improving sensitivity and etching resistance. Can be added to things.
- the blend of the compounds is preferably used in an amount of 1 to 49.999% by mass based on the total mass of the solid components of the resist composition.
- the glass transition temperature of the compounds represented by the formulas (1) and (3) is preferably 100 ° C. or higher, more preferably 120 ° C. or higher, still more preferably 140 ° C. or higher, and particularly preferably 150 ° C. or higher.
- the semiconductor lithography process has heat resistance capable of maintaining a pattern shape and tends to improve performance such as high resolution.
- the calorific value of crystallization obtained by differential scanning calorimetry analysis of the glass transition temperature of the compounds represented by the formulas (1) and (3) is preferably less than 20 J / g.
- (crystallization temperature) ⁇ (glass transition temperature) is preferably 70 ° C. or higher, more preferably 80 ° C. or higher, still more preferably 100 ° C. or higher, and particularly preferably 130 ° C. or higher.
- the crystallization exotherm is less than 20 J / g or (crystallization temperature) ⁇ (glass transition temperature) is within the above range, an amorphous film can be easily formed by spin coating the resist composition, Necessary film-forming properties can be maintained for a long time, and the resolution tends to be further improved.
- the crystallization heat generation amount, the crystallization temperature, and the glass transition temperature can be obtained by differential scanning calorimetry using DSC / TA-50WS manufactured by Shimadzu Corporation.
- About 10 mg of a sample is put in an aluminum non-sealed container and heated to a melting point or higher at a temperature rising rate of 20 ° C./min in a nitrogen gas stream (50 mL / min).
- the temperature is raised again to the melting point or higher at a temperature rising rate of 20 ° C./min in a nitrogen gas stream (30 mL / min). Further, after rapid cooling, the temperature is raised again to 400 ° C.
- the temperature at the midpoint of the step difference of the baseline that has changed in a step shape is the glass transition temperature (Tg), and the temperature of the exothermic peak that appears thereafter is the crystallization temperature.
- Tg glass transition temperature
- the calorific value is obtained from the area of the region surrounded by the exothermic peak and the baseline, and is defined as the crystallization calorific value.
- the compounds represented by the formula (1) and the formula (3) are 100 ° C. or less, preferably 120 ° C. or less, more preferably 130 ° C. or less, further preferably 140 ° C. or less, particularly preferably 150 ° C. or less under normal pressure. It is preferable that sublimability is low. Low sublimation means that, in thermogravimetric analysis, the weight loss when held at a predetermined temperature for 10 minutes is 10% or less, preferably 5% or less, more preferably 3% or less, even more preferably 1% or less, particularly preferably Indicates 0.1% or less. Since the sublimation property is low, it is possible to prevent contamination of the exposure apparatus due to outgas during exposure. Moreover, a favorable pattern shape can be obtained with low LER.
- the compounds represented by the formulas (1) and (3) preferably satisfy F ⁇ 3.0 (F represents the total number of atoms / (total number of carbon atoms ⁇ total number of oxygen atoms)), Preferably, F ⁇ 2.5 is satisfied.
- F represents the total number of atoms / (total number of carbon atoms ⁇ total number of oxygen atoms)
- F ⁇ 2.5 is satisfied.
- the solvent in the present embodiment examples include propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monomethyl ether (PGME), cyclohexanone (CHN), cyclopentanone (CPN), 2-heptanone, anisole, butyl acetate, ethyl propionate and What shows the highest solubility with respect to the blend of the compound chosen from ethyl lactate and represented with the said Formula (1) and Formula (3) is preferable.
- the dissolution amount of the compound represented by the formula (1) and the formula (3) is 23 ° C., preferably 1% by mass or more, more preferably 5% by mass or more, and further preferably 10% by mass or more.
- a solvent that is selected from PGMEA, PGME, and CHN and that exhibits the highest solubility in the compounds represented by the formulas (1) and (3) is more preferable.
- the amount of the compound represented by the formulas (1) and (3) is preferably 20% by mass or more at 23 ° C.
- PGMEA is more preferable.
- the amount of the compound represented by the formulas (1) and (3) is preferably 20% by mass or more at 23 ° C.
- Nitrogen atoms may be introduced into the compounds represented by the formulas (1) and (3) as long as the effects of the present embodiment are not impaired.
- the ratio of the number of nitrogen atoms to the total number of constituent atoms of the compounds represented by the formulas (1) and (3) is preferably 0.1 to 40%, and preferably 0.1 to 20%. More preferably, it is 0.1 to 10%, more preferably 0.1 to 5%. Within the above range, the line edge roughness of the resulting resist pattern tends to be lower.
- the introduced nitrogen atom is preferably a secondary or tertiary nitrogen atom, and more preferably a tertiary nitrogen atom.
- a cross-linking reactive group that causes a cross-linking reaction by a chemical reaction induced by at least one of irradiation or any of these may be introduced.
- the introduction is not limited to the following.
- the introduction is performed by reacting the compounds represented by the formulas (1) and (3) with a crosslinking reactive group introduction reagent in the presence of a base catalyst.
- crosslinking reactive group examples include, but are not limited to, a carbon-carbon multiple bond, an epoxy group, an azide group, a halogenated phenyl group, and a chloromethyl group.
- crosslinking reactive group introduction reagent examples include, but are not limited to, acids, acid chlorides, acid anhydrides, carboxylic acid derivatives such as dicarbonates, alkyl halides, and the like having such a crosslinking reactive group.
- a resist composition containing a compound having a crosslinking reactive group is also useful as a non-polymer resist composition having high resolution, high heat resistance, and solvent solubility.
- a non-acid-dissociable functional group may be introduced into at least one phenolic hydroxyl group of the compounds represented by the formulas (1) and (3) as long as the effects of the present embodiment are not impaired.
- the non-acid-dissociable functional group refers to a characteristic group that does not cleave in the presence of an acid and does not generate an alkali-soluble group.
- Non-acid-dissociable functional groups are not limited to the following, but include, for example, C1-20 alkyl groups, C3-20 cycloalkyl groups, C6-20 aryl groups, C1 which are not decomposed by the action of an acid.
- a functional group selected from the group consisting of ⁇ 20 alkoxyl group, cyano group, nitro group, hydroxyl group, heterocyclic group, halogen, carboxyl group, C1 ⁇ 20 alkylsilane, and derivatives thereof.
- a naphthoquinone diazide ester group may be introduced into the phenolic hydroxyl group of the compounds represented by the formulas (1) and (3) as long as the effects of the present embodiment are not impaired.
- a blend in which a naphthoquinone diazide ester group is introduced into at least one phenolic hydroxyl group of the compounds represented by the formula (1) and the formula (3) is used as a main component of the negative resist composition.
- it can be used as a main component of a positive radiation-sensitive composition, or can be added to a resist composition as an acid generator or additive.
- An acid-generating functional group that generates an acid upon irradiation with radiation is introduced into at least one phenolic hydroxyl group of the compounds represented by the formulas (1) and (3) within a range that does not impair the effects of the present embodiment. May be.
- an acid dissociable functional group that is dissociated by irradiation with radiation is introduced into at least one phenolic hydroxyl group of the compounds represented by the formulas (1) and (3).
- a blend obtained by introducing an acid-dissociable functional group into at least one phenolic hydroxyl group of the compounds represented by the formulas (1) and (3) includes a ketone solvent, an ester solvent, an alcohol solvent, an amide, which will be described later.
- a polar solvent such as an organic solvent or an ether solvent, or a hydrocarbon solvent
- it can be used as a negative resist composition containing the blend itself as a main component.
- an alkali developing solution it can use as a positive resist composition which has the said blend itself as a main component. In either case, it can be added to the resist composition as an additive.
- the acid-dissociable functional group refers to a characteristic group that is cleaved in the presence of an acid to generate an alkali-soluble group.
- the alkali-soluble group include, but are not limited to, a phenolic hydroxyl group, a carboxyl group, a sulfonic acid group, and a hexafluoroisopropanol group.
- a phenolic hydroxyl group and a carboxyl group are preferable, and a phenolic hydroxyl group is particularly preferable.
- the acid dissociable functional group is appropriately selected from those proposed for hydroxystyrene-based resins and (meth) acrylic acid-based resins used in chemically amplified resist compositions for KrF and ArF.
- Such acid dissociable functional groups include, but are not limited to, substituted methyl group, 1-substituted ethyl group, 1-substituted n-propyl group, 1-branched alkyl group, silyl group, acyl group, Examples thereof include a 1-substituted alkoxymethyl group, a cyclic ether group, an alkoxycarbonyl group, and an alkoxycarbonylalkyl group.
- the acid dissociable functional group preferably has no crosslinkable functional group.
- the substituted methyl group is usually a substituted methyl group having 2 to 20 carbon atoms, preferably a substituted methyl group having 4 to 18 carbon atoms, and more preferably a substituted methyl group having 6 to 16 carbon atoms.
- the substituted methyl group include, but are not limited to, methoxymethyl group, methylthiomethyl group, ethoxymethyl group, n-propoxymethyl group, isopropoxymethyl group, n-butoxymethyl group, t-butoxymethyl group, 2 -Methylpropoxymethyl group, ethylthiomethyl group, methoxyethoxymethyl group, phenyloxymethyl group, 1-cyclopentyloxymethyl group, 1-cyclohexyloxymethyl group, benzylthiomethyl group, phenacyl group, 4-bromophenacyl group, 4- Examples thereof include a methoxyphenacyl group, a piperonyl group, and a substituent represented by the following formula (13-1).
- the alkyl group represented by R 2 in the following formula (13-1) is not particularly limited, and examples thereof include a methyl group, an ethyl group, an isopropyl group, an n-propyl group, a t-butyl group, and an n-butyl group. Etc.
- R 2 is an alkyl group having 1 to 4 carbon atoms.
- the 1-substituted ethyl group is usually a 1-substituted ethyl group having 3 to 20 carbon atoms, preferably a 1-substituted ethyl group having 5 to 18 carbon atoms, and more preferably a substituted ethyl group having 7 to 16 carbon atoms. .
- Examples of the 1-substituted ethyl group include, but are not limited to, 1-methoxyethyl group, 1-methylthioethyl group, 1,1-dimethoxyethyl group, 1-ethoxyethyl group, 1-ethylthioethyl group, 1 , 1-diethoxyethyl group, n-propoxyethyl group, isopropoxyethyl group, n-butoxyethyl group, t-butoxyethyl group, 2-methylpropoxyethyl group, 1-phenoxyethyl group, 1-phenylthioethyl group 1,1-diphenoxyethyl group, 1-cyclopentyloxyethyl group, 1-cyclohexyloxyethyl group, 1-phenylethyl group, 1,1-diphenylethyl group, substituent represented by the following formula (13-2) Etc. can be mentioned.
- R 2 is the same as R 2 of formula (13-1).
- the 1-substituted-n-propyl group is usually a 1-substituted-n-propyl group having 4 to 20 carbon atoms, preferably a 1-substituted-n-propyl group having 6 to 18 carbon atoms, and having 8 carbon atoms. More preferred are 1 to 16 1-substituted-n-propyl groups.
- Examples of the 1-substituted-n-propyl group include, but are not limited to, 1-methoxy-n-propyl group and 1-ethoxy-n-propyl group.
- the 1-branched alkyl group is usually a 1-branched alkyl group having 3 to 20 carbon atoms, preferably a 1-branched alkyl group having 5 to 18 carbon atoms, and more preferably a branched alkyl group having 7 to 16 carbon atoms.
- Examples of the 1-branched alkyl group include, but are not limited to, isopropyl group, sec-butyl group, tert-butyl group, 1,1-dimethylpropyl group, 1-methylbutyl group, 1,1-dimethylbutyl group, Examples thereof include a 2-methyladamantyl group and a 2-ethyladamantyl group.
- the silyl group is usually a silyl group having 1 to 20 carbon atoms, preferably a silyl group having 3 to 18 carbon atoms, and more preferably a silyl group having 5 to 16 carbon atoms.
- Examples of the silyl group include, but are not limited to, a trimethylsilyl group, an ethyldimethylsilyl group, a methyldiethylsilyl group, a triethylsilyl group, a tert-butyldimethylsilyl group, a tert-butyldiethylsilyl group, and a tert-butyldiphenylsilyl group.
- the acyl group is usually an acyl group having 2 to 20 carbon atoms, preferably an acyl group having 4 to 18 carbon atoms, and more preferably an acyl group having 6 to 16 carbon atoms.
- acyl group examples include, but are not limited to, for example, acetyl group, phenoxyacetyl group, propionyl group, butyryl group, heptanoyl group, hexanoyl group, valeryl group, pivaloyl group, isovaleryl group, laurylyl group, adamantylcarbonyl group, benzoyl group And a naphthoyl group.
- the 1-substituted alkoxymethyl group is usually a 1-substituted alkoxymethyl group having 2 to 20 carbon atoms, preferably a 1-substituted alkoxymethyl group having 4 to 18 carbon atoms, and a 1-substituted alkoxy group having 6 to 16 carbon atoms. More preferred are alkoxymethyl groups.
- Examples of the 1-substituted alkoxymethyl group include, but are not limited to, 1-cyclopentylmethoxymethyl group, 1-cyclopentylethoxymethyl group, 1-cyclohexylmethoxymethyl group, 1-cyclohexylethoxymethyl group, 1-cyclooctylmethoxy.
- the cyclic ether group is usually a cyclic ether group having 2 to 20 carbon atoms, preferably a cyclic ether group having 4 to 18 carbon atoms, and more preferably a cyclic ether group having 6 to 16 carbon atoms.
- Examples of the cyclic ether group include, but are not limited to, tetrahydropyranyl group, tetrahydrofuranyl group, tetrahydrothiopyranyl group, tetrahydrothiofuranyl group, 4-methoxytetrahydropyranyl group, 4-methoxytetrahydrothiopyranyl. Groups and the like.
- the alkoxycarbonyl group is usually an alkoxycarbonyl group having 2 to 20 carbon atoms, preferably an alkoxycarbonyl group having 4 to 18 carbon atoms, and more preferably an alkoxycarbonyl group having 6 to 16 carbon atoms.
- the alkoxycarbonylalkyl group is usually an alkoxycarbonylalkyl group having 2 to 20 carbon atoms, preferably an alkoxycarbonylalkyl group having 4 to 18 carbon atoms, and more preferably an alkoxycarbonylalkyl group having 6 to 16 carbon atoms.
- R 3 is hydrogen or a linear or branched alkyl group having 1 to 4 carbon atoms, and n is an integer of 0 to 4)
- a substituted methyl group, a 1-substituted ethyl group, a 1-substituted alkoxymethyl group, a cyclic ether group, an alkoxycarbonyl group, and an alkoxycarbonylalkyl group are preferred, and a substituted methyl group, 1-substituted An ethyl group, an alkoxycarbonyl group and an alkoxycarbonylalkyl group are more preferred because of their high sensitivity, and further an acid dissociable functional group having a structure selected from a cycloalkane having 3 to 12 carbon atoms, a lactone and an aromatic ring having 6 to 12 carbon atoms. Is more preferable.
- the cycloalkane having 3 to 12 carbon atoms may be monocyclic or polycyclic, but is preferably polycyclic.
- Specific examples of the cycloalkane having 3 to 12 carbon atoms include, but are not limited to, monocycloalkane, bicycloalkane, tricycloalkane, tetracycloalkane, and the like. More specifically, cyclopropane, cyclobutane, Examples thereof include monocycloalkanes such as cyclopentane and cyclohexane, and polycycloalkanes such as adamantane, norbornane, isobornane, tricyclodecane, and tetracyclodecane.
- adamantane, tricyclodecane, and tetracyclodecane are preferable, and adamantane and tricyclodecane are particularly preferable.
- the cycloalkane having 3 to 12 carbon atoms may have a substituent.
- the lactone include butyrolactone or a cycloalkane group having 3 to 12 carbon atoms having a lactone group.
- the 6 to 12 aromatic ring include a benzene ring, a naphthalene ring, an anthracene ring, a phenanthrene ring, and a pyrene ring.
- a benzene ring and a naphthalene ring are preferable, and a naphthalene ring is particularly preferable.
- an acid dissociable functional group selected from the group consisting of groups represented by the following formula (13-4) is preferable because of its high resolution.
- R 5 is hydrogen or a linear or branched alkyl group having 1 to 4 carbon atoms
- R 6 is hydrogen, a linear or branched alkyl group having 1 to 4 carbon atoms, cyano A group, a nitro group, a heterocyclic group, a halogen or a carboxyl group
- n 1 is an integer of 0 to 4
- n 2 is an integer of 1 to 5
- n 0 is an integer of 0 to 4.
- the resist composition of this embodiment contains a solid component containing a resist base material and a solvent, and the resist base material contains a compound represented by formula (1) and a compound represented by formula (3). To do. Further, the resist composition of the present embodiment includes 1 to 80% by mass of a solid component and 20 to 99% by mass of a solvent. The resist composition of the present embodiment more preferably contains 1 to 50% by mass of a solid component and 50 to 99% by mass of a solvent, more preferably 1 to 40% by mass of a solid component and 60 to 99% by mass of a solvent. Particularly preferably, it contains 1 to 10% by mass of a solid component and 90 to 99% by mass of a solvent.
- the proportion of the compound represented by the formula (1) in the resist base is 65 to 99% by mass, preferably 70 to 99% by mass, more preferably 80 to 99% by mass from the viewpoint of the resist pattern shape. More preferably, it is 90 to 99% by mass.
- the mass ratio of the compound represented by the formula (3) to the compound represented by the formula (1) is 0.01 to 0.53, and from the viewpoint of the resist pattern shape, preferably 0.01 to 0.00. It is 30% by mass, more preferably 0.01 to 0.20% by mass, and still more preferably 0.01 to 0.15% by mass.
- the resist composition of this embodiment can form an amorphous film by spin coating.
- the dissolution rate of the amorphous film formed by spin-coating the resist composition of this embodiment with respect to the developer at 23 ° C. is preferably 10 ⁇ / sec or more, more preferably 10 to 10000 ⁇ / sec, and further preferably 100 to 1000 ⁇ / sec. preferable. When it is 10 ⁇ / sec or more, the solubility in a developer becomes better and the resist tends to be better. In addition, when the dissolution rate is 10000 kg / sec or less, the resolution may be improved.
- the dissolution rate of the amorphous film formed by spin-coating the resist composition of the present embodiment with a KrF excimer laser, extreme ultraviolet light, electron beam or X-ray radiation at 23 ° C. in a developing solution is 5 ⁇ / sec.
- the following is preferable, 0.05 to 5 K / sec is more preferable, and 0.0005 to 5 K / sec is further more preferable.
- the dissolution rate is 0.0005 kg / sec or more, the resolution may be improved. This is presumed to be because the micro surface sites of the blend of compounds dissolve and reduce LER. There is also an effect of reducing defects.
- Resist base material is a solid component total mass (resist base material, acid generator (C), acid cross-linking agent (G), acid diffusion controller (E) and other components (F), etc.) 20 to 99.498% by mass of the sum of the components (the same applies hereinafter) is preferable. More preferred is 30 to 90% by mass, still more preferred is 40 to 80% by mass, and particularly preferred is 50 to 70% by mass. When the blending ratio is above, higher resolution tends to be obtained, and line edge roughness tends to be smaller.
- the resist composition of this embodiment generates an acid directly or indirectly by irradiation with any radiation selected from visible light, ultraviolet light, excimer laser, electron beam, extreme ultraviolet light (EUV), X-ray and ion beam. It is preferable to include one or more acid generators (C).
- the amount of the acid generator (C) used is preferably 0.001 to 49% by mass, more preferably 1 to 40% by mass, still more preferably 3 to 30% by mass, and more preferably 10 to 25% by mass based on the total mass of the solid components. Particularly preferred. By using within the above range, a pattern profile with higher sensitivity and lower edge roughness tends to be obtained.
- the acid generation method is not particularly limited as long as the acid is generated in the system.
- excimer laser is used instead of ultraviolet rays such as g-line and i-line, finer processing is possible, and if high-energy rays are used electron beams, extreme ultraviolet rays, X-rays, ion beams, further fine processing is possible. Is possible.
- the acid generator (C) is preferably at least one selected from the group consisting of compounds represented by the following formulas (7-1) to (7-8).
- R 13 may be the same or different, and each independently represents a hydrogen atom, a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group. group, a hydroxyl group or a halogen atom;
- X - is an alkyl group, an aryl group, a sulfonic acid ion or halide ion having a halogen-substituted alkyl group or halogen-substituted aryl group).
- the compound represented by the formula (7-1) is not particularly limited, but is triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium nonafluoro-n-butanesulfonate, diphenyltolylsulfonium nonafluoro-n-butanesulfonate, triphenylsulfonium.
- R 14 may be the same or different and each independently represents a hydrogen atom, a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group. group, .X representing a hydroxyl group or a halogen atom - is X in formula (7-1) - is the same as).
- the compound represented by the formula (7-2) is not particularly limited, but bis (4-t-butylphenyl) iodonium trifluoromethanesulfonate, bis (4-t-butylphenyl) iodonium nonafluoro-n-butanesulfonate, Bis (4-t-butylphenyl) iodonium perfluoro-n-octanesulfonate, bis (4-t-butylphenyl) iodonium p-toluenesulfonate, bis (4-t-butylphenyl) iodonium benzenesulfonate, bis (4- t-butylphenyl) iodonium-2-trifluoromethylbenzenesulfonate, bis (4-t-butylphenyl) iodonium-4-trifluoromethylbenzenesulfonate, bis (4-t-butylphenyl) iodonium-2
- Q represents an alkylene group, an arylene group or an alkoxylene group
- R 15 represents an alkyl group, an aryl group, a halogen-substituted alkyl group or a halogen-substituted aryl group.
- the compound represented by the formula (7-3) is not particularly limited, but N- (trifluoromethylsulfonyloxy) succinimide, N- (trifluoromethylsulfonyloxy) phthalimide, N- (trifluoromethylsulfonyloxy) diphenyl Maleimide, N- (trifluoromethylsulfonyloxy) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide, N- (trifluoromethylsulfonyloxy) naphthylimide, N- (10 -Camphorsulfonyloxy) succinimide, N- (10-camphorsulfonyloxy) phthalimide, N- (10-camphorsulfonyloxy) diphenylmaleimide, N- (10-camphorsulfonyloxy) bicyclo [2.2.1] hept- 5-ene-2,3-di Ruboximide, N- (10-camphorsulf
- R 16 may be the same or different, and each independently represents an optionally substituted linear, branched or cyclic alkyl group, an optionally substituted aryl group, optionally A substituted heteroaryl group or an optionally substituted aralkyl group.
- the compound represented by the formula (7-4) is not particularly limited, but diphenyldisulfone, di (4-methylphenyl) disulfone, dinaphthyldisulfone, di (4-tert-butylphenyl) disulfone, di (4 Selected from the group consisting of -hydroxyphenyl) disulfone, di (3-hydroxynaphthyl) disulfone, di (4-fluorophenyl) disulfone, di (2-fluorophenyl) disulfone and di (4-tolufluoromethylphenyl) disulfone It is preferable that there is at least one kind.
- R 17 may be the same or different and each independently represents an optionally substituted linear, branched or cyclic alkyl group, an optionally substituted aryl group, optionally A substituted heteroaryl group or an optionally substituted aralkyl group.
- the compound represented by the formula (7-5) is not particularly limited, but ⁇ - (methylsulfonyloxyimino) -phenylacetonitrile, ⁇ - (methylsulfonyloxyimino) -4-methoxyphenylacetonitrile, ⁇ - (trifluoro) Methylsulfonyloxyimino) -phenylacetonitrile, ⁇ - (trifluoromethylsulfonyloxyimino) -4-methoxyphenylacetonitrile, ⁇ - (ethylsulfonyloxyimino) -4-methoxyphenylacetonitrile, ⁇ - (propylsulfonyloxyimino)- It is preferably at least one selected from the group consisting of 4-methylphenylacetonitrile and ⁇ - (methylsulfonyloxyimino) -4-bromophenylacetonitrile.
- R 18 s may be the same or different and each independently represents a halogenated alkyl group having one or more chlorine atoms and one or more bromine atoms.
- the number of carbon atoms is preferably 1 to 5.
- R 19 and R 20 are each independently an alkyl group having 1 to 3 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group; A cycloalkyl group such as a cyclohexyl group; an alkoxyl group having 1 to 3 carbon atoms such as a methoxy group, an ethoxy group, or a propoxy group; or an aryl group such as a phenyl group, a toluyl group, or a naphthyl group, preferably a carbon An aryl group having 6 to 10 atoms.
- L 19 and L 20 are each independently an organic group having a 1,2-naphthoquinonediazide group.
- the organic group having a 1,2-naphthoquinonediazide group is not particularly limited.
- the 1,2-naphthoquinonediazide-4-sulfonyl group, the 1,2-naphthoquinonediazide-5-sulfonyl group, Preferred examples include 1,2-quinonediazidesulfonyl groups such as 2-naphthoquinonediazide-6-sulfonyl group.
- 1,2-naphthoquinonediazido-4-sulfonyl group and 1,2-naphthoquinonediazide-5-sulfonyl group are preferable.
- p is an integer of 1 to 3
- q is an integer of 0 to 4
- 1 ⁇ p + q ⁇ 5 is preferable.
- J 19 is a single bond, a polymethylene group having 1 to 4 carbon atoms, a cycloalkylene group, a phenylene group, a group represented by the following formula (7-7-1), a carbonyl group, an ester group, an amide group or an ether group.
- Y 19 represents a hydrogen atom, an alkyl group or an aryl group
- X 20 each independently represents a group represented by the following formula (7-8-1).
- Z 22 each independently represents an alkyl group, a cycloalkyl group or an aryl group, R 22 represents an alkyl group, a cycloalkyl group or an alkoxyl group, and r represents 0 to 3 Is an integer.
- Examples of other acid generators include, but are not limited to, bis (p-toluenesulfonyl) diazomethane, bis (2,4-dimethylphenylsulfonyl) diazomethane, bis (tert-butylsulfonyl) diazomethane, bis (n- Butylsulfonyl) diazomethane, bis (isobutylsulfonyl) diazomethane, bis (isopropylsulfonyl) diazomethane, bis (n-propylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (isopropylsulfonyl) diazomethane, 1,3-bis (cyclohexylsulfonyl) Azomethylsulfonyl) propane, 1,4-bis (phenylsulfonylazomethylsulfonyl
- acid generators having an aromatic ring are preferable, and acid generators represented by formula (7-1) or (7-2) are more preferable.
- An acid generator having a sulfonate ion having X ⁇ in formula (7-1) or (7-2) having an aryl group or a halogen-substituted aryl group is more preferred, and an acid generator having a sulfonate ion having an aryl group are particularly preferred, and diphenyltrimethylphenylsulfonium p-toluenesulfonate, triphenylsulfonium p-toluenesulfonate, triphenylsulfonium trifluoromethanesulfonate, and triphenylsulfonium nonafluoromethanesulfonate are particularly preferred.
- the acid generator (C) may be used alone or in combination of two or more.
- the resist composition of the present embodiment preferably contains one or more acid crosslinking agents (G).
- the acid crosslinking agent (G) is a compound represented by the formula (1) and / or a compound represented by the formula (3) in the molecule or molecule in the presence of an acid generated from the acid generator (C). It is a compound that can be crosslinked.
- Such an acid cross-linking agent (G) is not particularly limited.
- the acid cross-linking agent (G) includes one or more groups (hereinafter referred to as “crosslinkable groups”) that can crosslink a compound having the configuration of formula (1) and a blend of the compound. And the like)).
- crosslinkable group examples include, but are not limited to, (i) hydroxy (C1-C6 alkyl group), C1-C6 alkoxy (C1-C6 alkyl group), acetoxy (C1-C6 alkyl group) (Ii) a carbonyl group such as formyl group, carboxy (C1-C6 alkyl group) or a group derived therefrom; (iii) a dimethylaminomethyl group, a diethylaminomethyl group Nitrogen-containing groups such as dimethylolaminomethyl group, diethylolaminomethyl group and morpholinomethyl group; (iv) glycidyl group-containing groups such as glycidyl ether group, glycidyl ester group and glycidylamino group; C1-C6 allyloxy (C1-C6 alkyl) such as methyl group, benzoyloxymethyl group, etc.
- Kill groups groups derived from aromatic groups such as C1-C6 aralkyloxy (C1-C6 alkyl groups); (vi) polymerizable multiple bond-containing groups such as vinyl groups and isopropenyl groups.
- a crosslinkable group of the acid crosslinking agent (G) in this embodiment a hydroxyalkyl group, an alkoxyalkyl group, and the like are preferable, and an alkoxymethyl group is particularly preferable.
- Examples of the acid crosslinking agent (G) having a crosslinkable group include, but are not limited to, (i) a methylol group-containing melamine compound, a methylol group-containing benzoguanamine compound, a methylol group-containing urea compound, and a methylol group-containing glycoluril compound.
- Methylol group-containing compounds such as methylol group-containing phenol compounds; (ii) alkoxyalkyl group-containing melamine compounds, alkoxyalkyl group-containing benzoguanamine compounds, alkoxyalkyl group-containing urea compounds, alkoxyalkyl group-containing glycoluril compounds, alkoxyalkyl group-containing phenols (Iii) carboxymethyl group-containing melamine compound, carboxymethyl group-containing benzoguanamine compound, carboxymethyl group-containing urea compound, Carboxymethyl group-containing compounds such as ruboxymethyl group-containing glycoluril compounds and carboxymethyl group-containing phenol compounds; (iv) bisphenol A epoxy compounds, bisphenol F epoxy compounds, bisphenol S epoxy compounds, novolac resin epoxy compounds, resole resins And epoxy compounds such as polyepoxy compounds and poly (hydroxystyrene) epoxy compounds.
- alkoxyalkyl group-containing melamine compounds alkoxyalkyl group-containing benzogu
- the acid crosslinking agent (G) compounds having phenolic hydroxyl groups, and compounds and resins imparted with crosslinking properties by introducing the crosslinking groups into acidic functional groups in alkali-soluble resins can be used.
- the introduction ratio of the crosslinkable group is usually 5 to 100 mol%, preferably 10 to 60 mol%, more preferably based on the total acidic functional group in the compound having a phenolic hydroxyl group and the alkali-soluble resin. Is adjusted to 15-40 mol%. The above range is preferable from the viewpoint of sufficient crosslinking reaction and avoiding a decrease in the remaining film ratio, a pattern swelling phenomenon, and meandering.
- the acid crosslinking agent (G) is preferably an alkoxyalkylated urea compound or a resin thereof, or an alkoxyalkylated glycoluril compound or a resin thereof.
- Particularly preferred acid crosslinking agents (G) include compounds represented by the following formulas (8-1) to (8-3) and alkoxymethylated melamine compounds (acid crosslinking agent (G1)).
- R 7 each independently represents a hydrogen atom, an alkyl group or an acyl group
- R 8 to R 11 each independently represents a hydrogen atom, a hydroxyl group
- And represents an alkyl group or an alkoxyl group
- X 2 represents a single bond, a methylene group or an oxygen atom.
- the alkyl group represented by R 7 preferably has 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms, and examples thereof include a methyl group, an ethyl group, and a propyl group.
- the acyl group represented by R 7 preferably has 2 to 6 carbon atoms, more preferably 2 to 4 carbon atoms, and examples thereof include an acetyl group and a propionyl group.
- the alkyl group represented by R 8 to R 11 preferably has 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms, and examples thereof include a methyl group, an ethyl group, and a propyl group.
- the alkoxyl group represented by R 8 to R 11 preferably has 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms, and examples thereof include a methoxy group, an ethoxy group, and a propoxy group.
- X 2 is preferably a single bond or a methylene group.
- R 7 to R 11 and X 2 may be substituted with an alkyl group such as a methyl group or an ethyl group; an alkoxy group such as a methoxy group or an ethoxy group; a hydroxyl group; or a halogen atom.
- the plurality of R 7 and R 8 to R 11 may be the same or different.
- Specific examples of the compound represented by the formula (8-2) include, but are not limited to, N, N, N, N, N-tetra (methoxymethyl) glycoluril, N, N, N, N-tetra (Ethoxymethyl) glycoluril, N, N, N, N-tetra (n-propoxymethyl) glycoluril, N, N, N, N-tetra (isopropoxymethyl) glycoluril, N, N, N, N- Examples thereof include tetra (n-butoxymethyl) glycoluril, N, N, N-tetra (t-butoxymethyl) glycoluril and the like. Of these, N, N, N, N-tetra (methoxymethyl) glycoluril is particularly preferable.
- alkoxymethylated melamine compound examples include, but are not limited to, N, N, N, N, N, N-hexa (methoxymethyl) melamine, N, N, N, N, N— Hexa (ethoxymethyl) melamine, N, N, N, N, N-hexa (n-propoxymethyl) melamine, N, N, N, N, N-hexa (isopropoxymethyl) melamine, N, Examples thereof include N, N, N, N, N-hexa (n-butoxymethyl) melamine, N, N, N, N, N-hexa (t-butoxymethyl) melamine and the like.
- the acid crosslinking agent (G1) is, for example, a lower alcohol such as methyl alcohol, ethyl alcohol, propyl alcohol, or butyl alcohol after a methylol group is introduced by a condensation reaction of a urea compound or a glycoluril compound and formalin. It is obtained by etherification, and then cooling the reaction solution to recover the precipitated compound or its resin.
- the acid cross-linking agent (G1) can also be obtained as a commercial product such as CYMEL (trade name, manufactured by Mitsui Cyanamid) or Nicalac (manufactured by Sanwa Chemical Co., Ltd.).
- the molecule has 1 to 6 benzene rings, and has at least two hydroxyalkyl groups and / or alkoxyalkyl groups in the molecule. And / or a phenol derivative in which an alkoxyalkyl group is bonded to any one of the benzene rings (acid crosslinking agent (G2)).
- it has a molecular weight of 1500 or less, 1 to 6 benzene rings in the molecule, and 2 or more hydroxyalkyl groups and / or alkoxyalkyl groups in total, and the hydroxyalkyl group and / or alkoxyalkyl group is the benzene
- hydroxyalkyl group bonded to the benzene ring those having 1 to 6 carbon atoms such as hydroxymethyl group, 2-hydroxyethyl group, 2-hydroxy-1-propyl group and the like are preferable.
- the alkoxyalkyl group bonded to the benzene ring is preferably one having 2 to 6 carbon atoms.
- Specific examples of the hydroxyalkyl group bonded to the benzene ring include a methoxymethyl group, an ethoxymethyl group, an n-propoxymethyl group, an isopropoxymethyl group, an n-butoxymethyl group, an isobutoxymethyl group, and a sec-butoxymethyl group. Group, t-butoxymethyl group, 2-methoxyethyl group or 2-methoxy-1-propyl group is preferred.
- L 1 to L 8 may be the same or different and each independently represents a hydroxymethyl group, a methoxymethyl group or an ethoxymethyl group.
- a phenol derivative having a hydroxymethyl group can be obtained by reacting a corresponding phenol compound having no hydroxymethyl group (a compound in which L 1 to L 8 are hydrogen atoms in the above formula) with formaldehyde in the presence of a base catalyst. it can.
- the reaction temperature is preferably 60 ° C. or lower. Specifically, it can be synthesized by the methods described in JP-A-6-282067, JP-A-7-64285 and the like.
- a phenol derivative having an alkoxymethyl group can be obtained by reacting a corresponding phenol derivative having a hydroxymethyl group with an alcohol in the presence of an acid catalyst.
- the reaction temperature is preferably 100 ° C. or lower. Specifically, it can be synthesized by the method described in EP632003A1 and the like.
- a phenol derivative having a hydroxymethyl group and / or an alkoxymethyl group synthesized in this manner is preferable in terms of stability during storage, but a phenol derivative having an alkoxymethyl group is particularly preferable from the viewpoint of stability during storage.
- the acid crosslinking agent (G2) may be used alone or in combination of two or more.
- Another particularly preferable acid crosslinking agent (G) is a compound having at least one ⁇ -hydroxyisopropyl group (acid crosslinking agent (G3)).
- the structure is not particularly limited as long as it has an ⁇ -hydroxyisopropyl group.
- the hydrogen atom of the hydroxyl group in the ⁇ -hydroxyisopropyl group is one or more acid-dissociable groups (R—COO— group, R—SO 2 — group, etc.), and R is a carbon number of 1-12.
- the compound having an ⁇ -hydroxyisopropyl group include one or two kinds such as a substituted or unsubstituted aromatic compound, diphenyl compound, naphthalene compound, and furan compound containing at least one ⁇ -hydroxyisopropyl group. The above is mentioned.
- benzene compound (1) a compound represented by the following general formula (9-1)
- benzene compound (2) a compound represented by the following general formula (9-3)
- naphthalene compound (3 a compound represented by the following general formula (9-4): And the like (hereinafter referred to as “furan compound (4)”).
- each A 2 independently represents an ⁇ -hydroxyisopropyl group or a hydrogen atom, and at least one A 2 is an ⁇ -hydroxyisopropyl group.
- R 51 represents a hydrogen atom, a hydroxyl group, a linear or branched alkylcarbonyl group having 2 to 6 carbon atoms, or a linear or branched structure having 2 to 6 carbon atoms. An alkoxycarbonyl group is shown.
- R 52 represents a single bond, a linear or branched alkylene group having 1 to 5 carbon atoms, —O—, —CO— or —COO—.
- R 53 and R 54 each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms.
- benzene compound (1) examples include, but are not limited to, ⁇ -hydroxyisopropylbenzene, 1,3-bis ( ⁇ -hydroxyisopropyl) benzene, 1,4-bis ( ⁇ -hydroxyisopropyl).
- ⁇ -hydroxyisopropylbenzenes such as benzene, 1,2,4-tris ( ⁇ -hydroxyisopropyl) benzene, 1,3,5-tris ( ⁇ -hydroxyisopropyl) benzene; 3- ⁇ -hydroxyisopropylphenol, 4 ⁇ -hydroxyisopropylphenols such as ⁇ -hydroxyisopropylphenol, 3,5-bis ( ⁇ -hydroxyisopropyl) phenol, 2,4,6-tris ( ⁇ -hydroxyisopropyl) phenol; 3- ⁇ -hydroxyisopropylphenyl ⁇ Methyl ketone, 4- ⁇ - Droxyisopropylphenyl / methyl ketone, 4- ⁇ -hydroxyisopropylphenyl / ethyl ketone, 4- ⁇ -hydroxyisopropylphenyl / n-propyl ketone, 4- ⁇ -hydroxyisopropylphenyl / isopropyl ketone, 4- ⁇ -hydroxyisopropyl
- diphenyl compound (2) examples include, but are not limited to, for example, 3- ⁇ -hydroxyisopropylbiphenyl, 4- ⁇ -hydroxyisopropylbiphenyl, 3,5-bis ( ⁇ -hydroxyisopropyl).
- the naphthalene compound (3) is not specifically limited to the following, but includes, for example, 1- ( ⁇ -hydroxyisopropyl) naphthalene, 2- ( ⁇ -hydroxyisopropyl) naphthalene, 1,3-bis ( ⁇ -Hydroxyisopropyl) naphthalene, 1,4-bis ( ⁇ -hydroxyisopropyl) naphthalene, 1,5-bis ( ⁇ -hydroxyisopropyl) naphthalene, 1,6-bis ( ⁇ -hydroxyisopropyl) naphthalene, 1,7-bis ( ⁇ -hydroxyisopropyl) naphthalene, 2,6-bis ( ⁇ -hydroxyisopropyl) naphthalene, 2,7-bis ( ⁇ -hydroxyisopropyl) naphthalene, 1,3,5-tris ( ⁇ -hydroxyisopropyl) naphthalene, , 3,6-Tris ( ⁇ -hydroxyisopropyl) na
- furan compound (4) include, but are not limited to, 3- ( ⁇ -hydroxyisopropyl) furan, 2-methyl-3- ( ⁇ -hydroxyisopropyl) furan, 2-methyl -4- ( ⁇ -hydroxyisopropyl) furan, 2-ethyl-4- ( ⁇ -hydroxyisopropyl) furan, 2-n-propyl-4- ( ⁇ -hydroxyisopropyl) furan, 2-isopropyl-4- ( ⁇ - Hydroxyisopropyl) furan, 2-n-butyl-4- ( ⁇ -hydroxyisopropyl) furan, 2-t-butyl-4- ( ⁇ -hydroxyisopropyl) furan, 2-n-pentyl-4- ( ⁇ -hydroxyisopropyl) ) Furan, 2,5-dimethyl-3- ( ⁇ -hydroxyisopropyl) furan, 2,5-diethyl-3- ( ⁇ -hydro) Xylisopropyl) furan, 3,4-bis ( ⁇ -hydroxyisopropyl)
- the acid crosslinking agent (G3) is preferably a compound having two or more free ⁇ -hydroxyisopropyl groups, the benzene compound (1) having two or more ⁇ -hydroxyisopropyl groups, and two or more ⁇ -hydroxyisopropyl groups.
- the diphenyl compound (2) having the above and the naphthalene compound (3) having two or more ⁇ -hydroxyisopropyl groups are more preferable, ⁇ -hydroxyisopropyl biphenyls having two or more ⁇ -hydroxyisopropyl groups, ⁇ -hydroxy A naphthalene compound (3) having two or more isopropyl groups is particularly preferred.
- the acid cross-linking agent (G3) is usually obtained by a method in which a acetyl group-containing compound such as 1,3-diacetylbenzene is reacted with a Grignard reagent such as CH 3 MgBr to be methylated and then hydrolyzed. It can be obtained by a method in which an isopropyl group-containing compound such as diisopropylbenzene is oxidized with oxygen or the like to generate a peroxide and then reduced.
- the amount of the acid crosslinking agent (G) used is preferably 0.5 to 49% by mass, more preferably 0.5 to 40% by mass, and still more preferably 1 to 30% by mass based on the total mass of the solid component. 2 to 20% by mass is particularly preferable. Setting the blending ratio of the acid crosslinking agent (G) to 0.5% by mass or more improves the effect of suppressing the solubility of the resist film in an alkaline developer, and the remaining film ratio decreases, pattern swelling, From the viewpoint of suppressing the occurrence of meandering. On the other hand, it is preferable to make the said mixture ratio into 50 mass% or less from a viewpoint of suppressing the heat resistant fall as a resist.
- the blending ratio of at least one compound selected from the acid crosslinking agent (G1), the acid crosslinking agent (G2), and the acid crosslinking agent (G3) in the acid crosslinking agent (G) is not particularly limited. Various ranges can be set depending on the type of substrate used when forming the pattern.
- the alkoxymethylated melamine compound and / or the compounds represented by (9-1) to (9-3) are 50 to 99% by mass, preferably 60 to 99% by mass, more preferably 70%. It is preferable that the content be ⁇ 98 mass%, more preferably 80 to 97 mass%. It is preferable from the viewpoint of improving the resolution that the alkoxymethylated melamine compound and / or the compound represented by (9-1) to (9-3) is 50% by mass or more of the total acid crosslinking agent component, and 99% by mass. The following is preferable because it tends to be a rectangular cross-sectional shape as the pattern cross-sectional shape.
- the acid diffusion controller (E) has an action of controlling the diffusion of the acid generated from the acid generator by irradiation in the resist film to prevent an undesirable chemical reaction in the unexposed area. May be blended in the resist composition.
- the storage stability of the resist composition tends to be improved.
- the acid diffusion control agent (E) the resolution is improved, and the change in the line width of the resist pattern due to fluctuations in the holding time before irradiation and the holding time after irradiation can be suppressed. , Tend to be superior to process stability.
- Examples of such an acid diffusion controller (E) include radiolytically decomposable basic compounds such as a nitrogen atom-containing basic compound, a basic sulfonium compound, and a basic iodonium compound.
- the acid diffusion controller (E) can be used alone or in combination of two or more.
- Examples of the acid diffusion controller include, but are not limited to, nitrogen-containing organic compounds and basic compounds that decompose upon exposure.
- the nitrogen-containing organic compound is not limited to the following, but for example, a compound represented by the following general formula (10) (hereinafter referred to as “nitrogen-containing compound (I)”), 2 nitrogen atoms in the same molecule.
- Diamino compound hereinafter referred to as “nitrogen-containing compound (II)”
- polyamino compound or polymer having three or more nitrogen atoms hereinafter referred to as “nitrogen-containing compound (III)”
- amide group-containing compound Urea compounds
- nitrogen-containing heterocyclic compounds examples of the acid diffusion controller include, but are not limited to, nitrogen-containing organic compounds and basic compounds that decompose upon exposure.
- the nitrogen-containing organic compound is not limited to the following, but for example, a compound represented by the following general formula (10) (hereinafter referred to as “nitrogen-containing compound (I)”), 2 nitrogen atoms in
- R 61 , R 62 and R 63 each independently represent a hydrogen atom, a linear, branched or cyclic alkyl group, an aryl group or an aralkyl group.
- the alkyl group, aryl group or aralkyl group may be unsubstituted or substituted with a hydroxyl group or the like.
- the linear, branched or cyclic alkyl group is not limited to the following, and examples thereof include those having 1 to 15 carbon atoms, preferably 1 to 10 carbon atoms.
- the aryl group include, but are not limited to, those having 6 to 12 carbon atoms.
- examples include a phenyl group, a tolyl group, a xylyl group, a cumenyl group, and a 1-naphthyl group.
- examples of the aralkyl group include those having 7 to 19 carbon atoms, preferably 7 to 13 carbon atoms, and specific examples include a benzyl group, an ⁇ -methylbenzyl group, a phenethyl group, and a naphthylmethyl group.
- nitrogen-containing compound (I) examples include, but are not limited to, for example, n-hexylamine, n-heptylamine, n-octylamine, n-nonylamine, n-decylamine, n-dodecylamine, cyclohexyl.
- Mono (cyclo) alkylamines such as amines; di-n-butylamine, di-n-pentylamine, di-n-hexylamine, di-n-heptylamine, di-n-octylamine, di-n-nonylamine
- Di (cyclo) alkylamines such as di-n-decylamine, methyl-n-dodecylamine, di-n-dodecylmethyl, cyclohexylmethylamine, dicyclohexylamine; triethylamine, tri-n-propylamine, tri-n- Butylamine, tri-n-pentylamine, tri-n-hexylamine, tri Tri (n-heptylamine, tri-n-octylamine, tri-n-nonylamine, tri-n-decylamine, dimethyl-n-dodecylamine, di-n-dodecylmethyl
- nitrogen-containing compound (II) examples include, but are not limited to, ethylenediamine, N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetrakis (2 -Hydroxypropyl) ethylenediamine, tetramethylenediamine, hexamethylenediamine, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 4,4'-diaminobenzophenone, 4,4'-diaminodiphenylamine, 2,2- Bis (4-aminophenyl) propane, 2- (3-aminophenyl) -2- (4-aminophenyl) propane, 2- (4-aminophenyl) -2- (3-hydroxyphenyl) propane, 2- ( 4-aminophenyl) -2- (4-hydroxyphenyl) propane, 1,4-bis [ - (4-aminophen
- nitrogen-containing compound (III) examples include, but are not limited to, polyethyleneimine, polyallylamine, N- (2-dimethylaminoethyl) acrylamide polymer, and the like.
- amide group-containing compound examples include, but are not limited to, for example, formamide, N-methylformamide, N, N-dimethylformamide, acetamide, N-methylacetamide, N, N-dimethylacetamide, propionamide, Examples thereof include benzamide, pyrrolidone, N-methylpyrrolidone and the like.
- urea compound examples include, but are not limited to, urea, methylurea, 1,1-dimethylurea, 1,3-dimethylurea, 1,1,3,3-tetramethylurea, 1,3 -Diphenylurea, tri-n-butylthiourea and the like can be mentioned.
- nitrogen-containing heterocyclic compound examples include, but are not limited to, imidazoles such as imidazole, benzimidazole, 4-methylimidazole, 4-methyl-2-phenylimidazole, and 2-phenylbenzimidazole; Pyridine, 2-methylpyridine, 4-methylpyridine, 2-ethylpyridine, 4-ethylpyridine, 2-phenylpyridine, 4-phenylpyridine, 2-methyl-4-phenylpyridine, nicotine, nicotinic acid, nicotinamide, Pyridines such as quinoline, 8-oxyquinoline, acridine; and pyrazine, pyrazole, pyridazine, quinosaline, purine, pyrrolidine, piperidine, morpholine, 4-methylmorpholine, piperazine, 1,4-dimethylpiperazine, 1,4-diazabicyclo [ .2.2] octane and the like can be mentioned.
- imidazoles such as
- the radiolytic basic compound is not limited to the following, but examples thereof include a sulfonium compound represented by the following general formula (11-1) and an iodonium compound represented by the following general formula (11-2). Etc.
- R 71 , R 72 , R 73 , R 74 and R 75 are each independently a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or 1 carbon atom.
- Z ⁇ represents HO ⁇ , R—COO ⁇ (wherein R represents an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 11 carbon atoms, or an alkaryl group having 7 to 12 carbon atoms) or
- An anion represented by the formula (11-3) is shown.
- radiolytic basic compound examples include, but are not limited to, triphenylsulfonium hydroxide, triphenylsulfonium acetate, triphenylsulfonium salicylate, diphenyl-4-hydroxyphenylsulfonium hydroxide, diphenyl, and the like.
- the amount of the acid diffusion controller (E) is preferably 0.001 to 49% by mass, more preferably 0.01 to 10% by mass, still more preferably 0.01 to 5% by mass, based on the total mass of the solid component. 0.01 to 3% by mass is particularly preferable. Within the above range, it is preferable from the viewpoint of preventing deterioration in resolution, pattern shape, dimensional fidelity, and the like. Furthermore, even if the holding time from the electron beam irradiation to the post-irradiation heating becomes long, there is a tendency that the deterioration of the shape of the pattern upper layer portion can be effectively prevented.
- a dissolution accelerator for the purpose of the present embodiment is not hindered, as other components (F), a dissolution accelerator, a dissolution controller, a sensitizer, a surfactant, Various additives such as organic carboxylic acids or phosphorus oxo acids or derivatives thereof can be added alone or in combination.
- Dissolution Accelerator A low molecular weight dissolution accelerator increases the solubility of a compound represented by formula (1) and a compound represented by formula (3) when the solubility in a developer is too low.
- the dissolution promoter include, but are not limited to, low molecular weight phenolic compounds, and specific examples include bisphenols and tris (hydroxyphenyl) methane. These dissolution promoters can be used alone or in admixture of two or more.
- the blending amount of the dissolution accelerator is appropriately adjusted according to the type of the compound represented by the formula (1) and the compound represented by the formula (3) to be used. 0 to 5% by mass is more preferable, 0 to 1% by mass is further preferable, and 0% by mass is particularly preferable.
- Dissolution control agent is developed by controlling the solubility of the compound represented by the formula (1) and the compound represented by the formula (3) when the solubility in the developer is too high. It is a component having an action of moderately reducing the dissolution rate. As such a dissolution control agent, those that do not chemically change in steps such as baking of resist film, irradiation with radiation, and development are preferable.
- dissolution control agent examples include, but are not limited to, aromatic hydrocarbons such as phenanthrene, anthracene, and acenaphthene; ketones such as acetophenone, benzophenone, and phenylnaphthyl ketone; methylphenylsulfone, diphenylsulfone, dinaphthylsulfone, and the like. And the like.
- These dissolution control agents can be used alone or in combination of two or more.
- the blending amount of the dissolution control agent is appropriately adjusted according to the type of the compound represented by the formula (1) and the compound represented by the formula (3) to be used, but is 0 to 49% by mass of the total mass of the solid component. 0 to 5% by mass is more preferable, 0 to 1% by mass is further preferable, and 0% by mass is particularly preferable.
- Sensitizer absorbs the energy of the irradiated radiation and transmits the energy to the acid generator (C), thereby increasing the amount of acid generated, and resist. It is a component that improves the apparent sensitivity.
- sensitizers include, but are not limited to, benzophenones, biacetyls, pyrenes, phenothiazines, and fluorenes. These sensitizers can be used alone or in combination of two or more.
- the blending amount of the sensitizer is appropriately adjusted according to the type of the compound represented by the formula (1) and the formula (3) to be used, but is 0 to 49% by mass of the total mass of the solid component. 0 to 5% by mass is more preferable, 0 to 1% by mass is further preferable, and 0% by mass is particularly preferable.
- the surfactant is a component having an action of improving the coating property and striation of the resist composition of the present embodiment, the developability of the resist, and the like.
- a surfactant is not particularly limited, and may be anionic, cationic, nonionic or amphoteric.
- a preferred surfactant is a nonionic surfactant.
- the nonionic surfactant has a good affinity with the solvent used in the production of the resist composition and is more effective. Examples of nonionic surfactants include, but are not limited to, polyoxyethylene higher alkyl ethers, polyoxyethylene higher alkyl phenyl ethers, polyethylene glycol higher fatty acid diesters, and the like.
- F top made by Gemco
- MegaFac made by Dainippon Ink and Chemicals
- Florard made by Sumitomo 3M
- Asahi Guard Surflon
- Pepol manufactured by Toho Chemical Co., Ltd.
- KP manufactured by Shin-Etsu Chemical Co., Ltd.
- Polyflow manufactured by Kyoeisha Yushi Chemical Co., Ltd.
- the blending amount of the surfactant is appropriately adjusted according to the type of the compound represented by the formula (1) and the formula (3) to be used, but is 0 to 49% by mass of the total mass of the solid component. 0 to 5% by mass is more preferable, 0 to 1% by mass is further preferable, and 0% by mass is particularly preferable.
- Organic carboxylic acid or phosphorus oxo acid or derivative thereof for the purpose of preventing sensitivity deterioration or improving resist pattern shape, retention stability, etc., organic carboxylic acid or phosphorus oxo acid or derivative thereof as an optional component Can be contained. In addition, it can be used in combination with an acid diffusion controller, or may be used alone. Although it does not specifically limit as organic carboxylic acid, For example, malonic acid, a citric acid, malic acid, a succinic acid, a benzoic acid, a salicylic acid etc. are suitable.
- Phosphorus oxoacids or derivatives thereof include, but are not limited to, phosphoric acid, phosphoric acid di-n-butyl ester, phosphoric acid diphenyl ester and other phosphoric acid or derivatives thereof; phosphonic acid, phosphonic acid dimethyl Derivatives such as esters, phosphonic acid di-n-butyl ester, phenylphosphonic acid, phosphonic acid diphenyl ester, phosphonic acid dibenzyl ester or the like; phosphinic acid, phenylphosphinic acid or the like, or their Derivatives such as esters are exemplified, and among these, phosphonic acid is particularly preferable.
- the organic carboxylic acid or phosphorus oxo acid or derivative thereof may be used alone or in combination of two or more.
- the amount of the organic carboxylic acid or phosphorus oxo acid or derivative thereof is appropriately adjusted depending on the type of the compound represented by the formula (1) and the compound represented by the formula (3) to be used.
- the total mass is preferably 0 to 49% by mass, more preferably 0 to 5% by mass, still more preferably 0 to 1% by mass, and particularly preferably 0% by mass.
- additives other than organic carboxylic acid or phosphorus oxo acid or derivatives thereof can be blended as necessary within a range not inhibiting the purpose.
- additives include, but are not limited to, dyes, pigments, and adhesion aids.
- dyes, pigments, and adhesion aids For example, it is preferable to add a dye or a pigment because the latent image in the exposed area can be visualized and the influence of halation during exposure can be reduced.
- adhesion assistant because the adhesion to the substrate can be improved.
- examples of other additives include an antihalation agent, a storage stabilizer, an antifoaming agent, a shape improving agent, and the like, specifically 4-hydroxy-4′-methylchalcone.
- the total amount of the optional component (F) is preferably 0 to 49% by mass, more preferably 0 to 5% by mass, further preferably 0 to 1% by mass, and particularly preferably 0% by mass based on the total mass of the solid component.
- Ratio of resist base material, acid generator (C), acid crosslinking agent (G), acid diffusion controller (E) and optional component (F) in the solid component (resist base material / acid generator (C) / Acid crosslinking agent (G) / acid diffusion controller (E) / optional component (F)) is preferably 20 to 99.498 / 0.001 to 49 / 0.5 to 49 / on a mass% basis.
- It is in the range of 0.001 to 49/0 to 49, more preferably in the range of 30 to 90/1 to 40 / 0.5 to 40 / 0.01 to 10/0 to 5, and still more preferably It is in the range of 40 to 80/3 to 30/1 to 30 / 0.01 to 5/0 to 1, and particularly preferably 50 to 70/10 to 25/2 to 20 / 0.01 to 3/0. It is a range.
- the blending ratio of each component is selected from each range so that the sum is 100% by mass. When the above composition is used, it tends to be more excellent in performance such as sensitivity, resolution and developability.
- the resist composition of the present embodiment is usually prepared by dissolving each component in a solvent at the time of use to make a uniform solution, and then filtering with a filter having a pore size of about 0.2 ⁇ m, if necessary. .
- the solvent used in the preparation of the resist composition of the present embodiment is not limited to the following, but examples thereof include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono-n-propyl ether acetate, ethylene Ethylene glycol monoalkyl ether acetates such as glycol mono-n-butyl ether acetate; ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether; propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene Glycol mono-n-propyl ether acetate, propylene glycol mono-n-butyl Propylene glycol monoalkyl ether acetates such as ether acetate; Propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether and propylene glycol monoethy
- the resist composition of the present embodiment can contain a resin as long as the object of the present embodiment is not impaired.
- the resin is not limited to the following. A combination or a derivative thereof may be used.
- the compounding amount of the resin is appropriately adjusted according to the type of blend of the compound represented by the formula (1) and the compound represented by the formula (3) to be used. It is preferably no greater than 10 parts by mass, more preferably no greater than 10 parts by mass, even more preferably no greater than 5 parts by mass, and particularly preferably 0 parts by mass.
- the resist pattern forming method of the present embodiment includes a step of applying the resist composition of the present embodiment on a substrate to form a resist film, a step of exposing the resist film, and a step of developing the exposed resist film. .
- the resist pattern can also be formed as an upper layer resist in a multilayer process.
- a resist film is first formed by applying the resist composition on a conventionally known substrate by a coating means such as spin coating, cast coating, roll coating or the like.
- the conventionally known substrate is not particularly limited, and examples thereof include a substrate for electronic parts and a substrate on which a predetermined wiring pattern is formed. More specifically, a silicon substrate, a metal substrate such as copper, chromium, iron, and aluminum, a glass substrate, and the like can be given.
- the material for the wiring pattern is not particularly limited, and examples thereof include copper, aluminum, nickel, and gold. If necessary, an inorganic and / or organic film may be provided on the substrate.
- the inorganic film is not particularly limited, and examples thereof include an inorganic antireflection film (inorganic BARC). Although it does not specifically limit as an organic film
- the coated substrate is heated as necessary.
- the heating conditions vary depending on the composition of the resist composition, but are preferably 20 to 250 ° C., more preferably 20 to 150 ° C. Heating is preferred because the adhesion of the resist to the substrate may be improved.
- the resist film is exposed to a desired pattern with any radiation selected from the group consisting of visible light, ultraviolet light, excimer laser, electron beam, extreme ultraviolet light (EUV), X-ray, and ion beam.
- the exposure conditions and the like are appropriately selected according to the composition of the resist composition.
- heating is preferably performed after radiation irradiation.
- the heating conditions vary depending on the composition of the resist composition, but are preferably 20 to 250 ° C., more preferably 20 to 150 ° C.
- a predetermined resist pattern is formed by developing the exposed resist film with a developer.
- the developer is not particularly limited.
- a polar solvent such as a ketone solvent, an ester solvent, an alcohol solvent, an amide solvent, an ether solvent, or a hydrocarbon solvent can be used. .
- alkaline aqueous solution examples include, but are not limited to, mono-, di- or trialkylamines, mono-, di- or trialkanolamines, heterocyclic amines, tetramethylammonium hydroxide (TMAH), Examples include alkaline compounds such as choline.
- TMAH tetramethylammonium hydroxide
- ketone solvent examples include, but are not limited to, for example, 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, acetone, 4-heptanone, 1-hexanone, 2-hexanone, diisobutyl ketone, cyclohexanone, methyl
- ester solvents include, but are not limited to, methyl acetate, butyl acetate, ethyl acetate, isopropyl acetate, amyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl.
- alcohol solvents include, but are not limited to, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol (2-propanol), n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, isobutyl alcohol.
- Alcohols such as n-hexyl alcohol, 4-methyl-2-pentanol, n-heptyl alcohol, n-octyl alcohol, n-decanol, glycol solvents such as ethylene glycol, diethylene glycol and triethylene glycol, and ethylene glycol Monomethyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, diethylene glycol monomethyl Mention may be made of ether, triethylene glycol monoethyl ether, glycol monoethyl ether and methoxymethyl butanol.
- ether solvent examples include, but are not limited to, dioxane, tetrahydrofuran and the like in addition to the glycol ether solvent.
- amide solvents include, but are not limited to, N-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, hexamethylphosphoric triamide, 1,3-dimethyl-2 -Imidazolidone etc. can be used.
- hydrocarbon solvent examples include, but are not limited to, aromatic hydrocarbon solvents such as toluene and xylene, and aliphatic hydrocarbon solvents such as pentane, hexane, octane, and decane.
- a plurality of them may be mixed, or may be used by mixing with a solvent other than the above or water within the range having performance.
- the vapor pressure of the developer is preferably 5 kPa or less, more preferably 3 kPa or less, and further preferably 2 kPa or less at 20 ° C.
- the developer having a vapor pressure of 5 kPa or less include, but are not limited to, 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, 4-heptanone, 2-hexanone, diisobutyl ketone, Ketone solvents such as cyclohexanone, methylcyclohexanone, phenylacetone, methylisobutylketone; butyl acetate, amyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, ethyl-3 -Ethoxypropionate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, butyl formate, propyl formate, ethyl lactate, lactic acid butyl And ester solvent
- the developer having a vapor pressure of 2 kPa or less include, but are not limited to, 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, 4-heptanone, 2- Ketone solvents such as hexanone, diisobutyl ketone, cyclohexanone, methylcyclohexanone, phenylacetone; butyl acetate, amyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, ethyl- Estes such as 3-ethoxypropionate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, ethyl lactate, butyl lactate, propyl lactate Solvents: alcohols such as
- the surfactant is not particularly limited, and for example, ionic or nonionic fluorine-based and / or silicon-based surfactants can be used.
- fluorine and / or silicon surfactants include, for example, JP-A-62-36663, JP-A-61-226746, JP-A-61-226745, JP-A-62-170950.
- it is a nonionic surfactant.
- it does not specifically limit as a nonionic surfactant, It is still more preferable to use a fluorochemical surfactant or a silicon-type surfactant.
- the amount of the surfactant used is usually 0.001 to 5% by mass, preferably 0.005 to 2% by mass, and more preferably 0.01 to 0.5% by mass with respect to the total amount of the developer.
- the development method is not limited to the following, but, for example, a method of immersing the substrate in a tank filled with the developer for a certain period of time (dip method), raising the developer on the surface of the substrate by the surface tension, and standing still for a certain period Developing method (paddle method), spraying developer solution onto the substrate surface (spray method), and applying developer solution while scanning the developer application nozzle at a constant speed on a substrate rotating at a constant speed A continuing method (dynamic dispensing method) can be applied.
- the time for developing the pattern is not particularly limited, but is preferably 10 seconds to 90 seconds.
- a step of stopping development may be performed while substituting with another solvent.
- a washing step using a rinse solution containing an organic solvent may be performed.
- the rinsing liquid used in the rinsing step after development is not particularly limited as long as the resist pattern cured by crosslinking is not dissolved, and a solution or water containing a general organic solvent can be used.
- As the rinsing liquid it is preferable to use a rinsing liquid containing at least one organic solvent selected from hydrocarbon solvents, ketone solvents, ester solvents, alcohol solvents, amide solvents and ether solvents. .
- a cleaning step is performed using a rinse solution containing at least one organic solvent selected from the group consisting of ketone solvents, ester solvents, alcohol solvents, and amide solvents. More preferably, after the development, a step of washing with a rinse solution containing an alcohol solvent or an ester solvent is performed. Even more preferably, after the development, a step of washing with a rinsing solution containing a monohydric alcohol is performed. Particularly preferably, after the development, a washing step is performed using a rinsing liquid containing a monohydric alcohol having 5 or more carbon atoms. The time for rinsing the pattern is not particularly limited, but is preferably 10 seconds to 90 seconds.
- the monohydric alcohol used in the rinsing step after development is not limited to the following, and examples thereof include linear, branched, or cyclic monohydric alcohols. Specific examples include 1-butanol, 2-butanol, 3-methyl-1-butanol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 1-hexanol, 4-methyl-2-pentanol, 1-heptanol, 1-octanol, 2- Hexanol, cyclopentanol, 2-heptanol, 2-octanol, 3-hexanol, 3-heptanol, 3-octanol, 4-octanol and the like can be used.
- Particularly preferable monohydric alcohol having 5 or more carbon atoms is 1 -Hexanol, 2-hexanol, 4-methyl-2-pentanol, 1-pentanol, - or the like can be used methyl-1-butanol.
- a plurality of the above components may be mixed, or may be used by mixing with an organic solvent other than the above.
- the water content in the rinse liquid is preferably 10% by mass or less, more preferably 5% by mass or less, and particularly preferably 3% by mass or less. By setting the water content to 10% by mass or less, better development characteristics tend to be obtained.
- the vapor pressure of the rinsing liquid used after development is preferably 0.05 kPa to 5 kPa at 20 ° C., more preferably 0.1 kPa to 5 kPa, and further preferably 0.12 kPa to 3 kPa.
- the vapor pressure of the rinsing liquid used after development is preferably 0.05 kPa to 5 kPa at 20 ° C., more preferably 0.1 kPa to 5 kPa, and further preferably 0.12 kPa to 3 kPa.
- An appropriate amount of a surfactant can be added to the rinse solution.
- the developed wafer is cleaned using a rinsing solution containing the organic solvent.
- the method of the cleaning treatment is not particularly limited. For example, a method of continuously applying a rinse liquid onto a substrate rotating at a constant speed (rotary coating method), or immersing the substrate in a tank filled with the rinse liquid for a certain period of time. A method (dip method), a method of spraying a rinsing liquid onto the substrate surface (spray method), etc. can be applied.
- a cleaning process is performed by a spin coating method, and after cleaning, the substrate is rotated at a speed of 2000 rpm to 4000 rpm. It is preferable to rotate and remove the rinse liquid from the substrate.
- the pattern wiring board is obtained by etching.
- the etching can be performed by a known method such as dry etching using plasma gas and wet etching using an alkali solution, a cupric chloride solution, a ferric chloride solution, or the like.
- plating can be performed on the resist pattern.
- the plating method include, but are not limited to, copper plating, solder plating, nickel plating, and gold plating.
- the residual resist pattern after etching can be peeled off with an organic solvent.
- organic solvent include, but are not limited to, PGMEA (propylene glycol monomethyl ether acetate), PGME (propylene glycol monomethyl ether), EL (ethyl lactate), and the like.
- peeling method include, but are not limited to, an immersion method and a spray method.
- the wiring board on which the resist pattern is formed may be a multilayer wiring board or may have a small diameter through hole.
- the wiring substrate obtained in the present embodiment can also be formed by a method of depositing a metal in a vacuum after forming a resist pattern and then dissolving the resist pattern with a solution, that is, a lift-off method.
- Synthesis Example 1 (Synthesis of CR-1t and CR-1c) 74.3 g (3.71 mol) of anhydrous HF and 50.5 g (0.744 mol) of BF 3 were charged into an autoclave with a magnetic stirrer (manufactured by SUS316L) having an internal volume of 500 ml capable of controlling the temperature. Next, the contents were stirred, and the pressure was increased to 2 MPa with carbon monoxide while maintaining the liquid temperature at ⁇ 30 ° C.
- the molecular weight 188 of the target 4-cyclohexylbenzaldehyde (hereinafter referred to as CHBAL) was shown.
- the chemical shift value ( ⁇ ppm, TMS standard) of 1 H-NMR in deuterated chloroform solvent is 1.0 to 1.6 (m, 10H), 2.6 (m, 1H), 7.4 (d , 2H), 7.8 (d, 2H), 10.0 (s, 1H).
- resorcinol manufactured by Kanto Chemical Co., Inc., 23.1 g
- a four-necked flask 500 mL
- a sufficiently dried, nitrogen-substituted dropping funnel Jim Roth condenser, thermometer, and stirring blade.
- ethanol 190 g
- This solution was ice-cooled, concentrated sulfuric acid (97%, 18.5 g, 0.2 mol) and 23.9 g of pure water were added dropwise by a dropping funnel over 10 minutes while cooling and stirring at 5 to 15 ° C.
- the structure of the (ctt) isomer of CR-1 showed a number average molecular weight Mn979 and a weight average molecular weight Mw986 in terms of styrene.
- the chemical shift value ( ⁇ ppm, TMS standard) of 1 H-NMR in deuterated acetonitrile solvent is 0.8 to 1.9 (m, 44H), 5.5 (s, 4H), 6.0 to 6. 4 (d, 8H), 6.6 to 6.7 (m, 16H), 8.4, 8.5 (m, 8H). From these results, the obtained product was identified as the (ctt) isomer of the target compound (CR-1).
- the composition ratio of (ccc) isomer / (ctt) isomer / other isomer was 97.6 / 2.4 / 0.0. there were.
- the thermal decomposition temperature of this purified product was 350 ° C.
- the glass transition temperature was 186 ° C.
- the structure of the (ccc) isomer of this product showed a number average molecular weight Mn979 and a weight average molecular weight Mw986 in terms of styrene.
- the chemical shift value ( ⁇ ppm, TMS standard) of 1 H-NMR in deuterated acetonitrile solvent is 0.8 to 1.9 (m, 44H), 5.6 (s, 4H), 6.1 to 6. 5 (d, 8H), 6.7 to 6.9 (m, 16H), and 8.5 (m, 8H). From these results, the obtained product was identified as the (ccc) isomer of the target compound (CR-1).
- Synthesis Example 5 (Synthesis of CR-8t and CR-8c) BPAL (Mitsubishi Gas Chemical Co., Ltd., 4-phenylbenzaldehyde) was used instead of 4-cyclohexylbenzaldehyde, and the others were the same as in Synthesis Example 1.
- the filtrate concentrate obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 1.7 g of a product (hereinafter referred to as CR-8t).
- the crystal obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 5.4 g of a product (hereinafter referred to as CR-8c).
- composition ratio of (ccc) isomer / (ctt) isomer / other isomers was 0.0 / 99.8 / 0.2 and (ccc) isomer /
- the composition ratio of (ctt) isomer / other isomer was 98.3 / 1.4 / 2.3.
- Synthesis Example 6 (Synthesis of CR-10t) EV (Toyotama Fragrance Co., Ltd., ethyl vanillin) was used instead of 4-cyclohexylbenzaldehyde, and the others were the same as in Synthesis Example 1.
- the filtrate concentrate obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 2.2 g of a product (hereinafter referred to as CR-10t).
- CR-10t a product
- the composition ratio of (ccc) isomer / (ctt) isomer / other isomer was 2.7 / 97.3 / 0.0.
- Synthesis Example 7 (Synthesis of CR-11c) Instead of 4-cyclohexylbenzaldehyde, 3,4-DBAL (Mitsubishi Gas Chemical Co., Ltd., 3,4-dimethylbenzaldehyde) was used, and the others were the same as in Synthesis Example 1.
- the crystal obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 5.3 g of a product (hereinafter referred to as CR-11c).
- CR-11c a product
- the composition ratio of (ccc) isomer / (ctt) isomer / other isomers was 99.9 / 0.0 / 0.1.
- Synthesis Example 8 (Synthesis of CR-12c) Instead of 4-cyclohexylbenzaldehyde, PTAL (Mitsubishi Gas Chemical Co., p-tolualdehyde) was used, and the others were the same as in Synthesis Example 1.
- the crystal obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 0.5 g of a product (hereinafter referred to as CR-12c).
- CR-12c a product
- the composition ratio of (ccc) isomer / (ctt) isomer / other isomer was 99.9 / 0.1 / 0.0.
- Synthesis Example 9 (Synthesis of CR-13c) Instead of 4-cyclohexylbenzaldehyde, EBAL (manufactured by Mitsubishi Gas Chemical Co., Ltd., 4-ethylbenzaldehyde) was used, and the others were the same as in Synthesis Example 1.
- the crystal obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 5.2 g of a product (hereinafter referred to as CR-13c).
- CR-13c a product
- the composition ratio of (ccc) isomer / (ctt) isomer / other isomers was 99.7 / 0.2 / 0.1.
- Synthesis Example 11 (Synthesis of CR-17t) TBAL (Mitsubishi Gas Chemical Co., Ltd., 2,4,5-trimethylbenzaldehyde) was used instead of 4-cyclohexylbenzaldehyde, and the others were the same as in Synthesis Example 1.
- the filtrate concentrate obtained from the second recrystallization was used for a third recrystallization with ethyl acetate to obtain 1.3 g of a product (hereinafter referred to as CR-17t).
- CR-17t a product
- the composition ratio of (ccc) isomer / (ctt) isomer / other isomers was 0.0 / 96.0 / 4.0.
- Synthesis Example 12 The product CR-1 synthesized and purified in Synthesis Example 1 was used. As a result of analyzing this product by HPLC, the composition ratio of (ccc) isomer / (ctt) isomer / (cct) isomer was 49.9 / 49.9 / 0.2.
- Examples 1 to 18 and Comparative Examples 1 to 4> Patterning test After preparing each component as shown in Table 1 and preparing a uniform solution, it is filtered through a membrane filter made of Teflon with a pore size of 0.1 ⁇ m to prepare a resist composition corresponding to each example. The following evaluation was performed. The evaluation results are shown in Table 2.
- Acid generator (C) P-1 Triphenylbenzenesulfonium trifluoromethanesulfonate (Midori Chemical Co., Ltd.)
- Q-1 Trioctylamine (Tokyo Chemical Industry Co., Ltd.)
- Solvent S-1 Propylene glycol monomethyl ether (Tokyo Chemical Industry Co., Ltd.)
- the resist composition of each example was spin-coated on a clean silicon wafer, followed by pre-exposure baking (PB) in an oven at 110 ° C. to form a resist film having a thickness of 60 nm.
- the resist film was irradiated with an electron beam of 30 nm, 25 nm, 20 nm, and a 1: 1 line and space setting with an electron beam drawing apparatus (ELS-7500, manufactured by Elionix Co., Ltd.). After the irradiation, each film was heated at a predetermined temperature for 90 seconds, and developed by being immersed in a tetramethylammonium hydroxide (TMAH) 2.38 wt% alkali developer for 60 seconds.
- TMAH tetramethylammonium hydroxide
- Line edge roughness of the pattern is arbitrary 300 points in the length direction (0.75 ⁇ m) of 1: 1 line and space.
- SEM terminal PC V5 offline length measurement software for Hitachi Semiconductor (manufactured by Hitachi Science Systems, Ltd.) was used to measure the distance between the edge and the reference line.
- a standard deviation (3 ⁇ ) was calculated from the measurement result and used as an index of LER. From the obtained standard deviation, LER was evaluated based on the following criteria.
- B 4.0 nm ⁇ LER ⁇ 8.0 nm (good LER)
- the resist composition of the present embodiment can form a resist pattern with high sensitivity, small roughness, and good shape as compared with the resist composition containing the compound of the comparative example.
- resist compositions other than those described in the examples also exhibit the same effect.
- the present invention is suitably used for a useful resist composition and a resist pattern forming method using the resist composition.
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Abstract
Description
また、特許文献3に記載の環状フェノール化合物では、良好なパターンが得られるものの、溶解度特性などの物質特性が若干不安定であり、良好なパターン形状を安定的に得ることはできない。
その他、非特許文献1に記載されているものを含めて現在知られている低分子量環状ポリフェノール化合物は、半導体製造プロセスに用いられる安全溶媒に対する溶解性が低い、感度が低い、得られるレジストパターン形状が悪い等の問題点があり、低分子量環状ポリフェノール化合物の改良が望まれている。
[1]
レジスト基材を含む固形成分と溶媒とを含有するレジスト組成物であって、
前記レジスト組成物中の固形成分が1~80質量%、溶媒が20~99質量%の範囲であり、
前記レジスト基材が下記式(1)で表される化合物(ctt体)と下記式(3)で表される化合物とを含有し、
前記レジスト基材に占める下記式(1)で表される化合物(ctt体)の割合が65~99質量%であり、かつ
下記式(1)で表される化合物(ctt体)に対する下記式(3)で表される化合物の質量比率が0.01~0.53である、レジスト組成物。
[2]
前記式(1)中、Rが水素原子である、[1]に記載のレジスト組成物。
[3]
前記式(1)中、pが1である、[1]又は[2]に記載のレジスト組成物。
[4]
前記式(1)で表される化合物が、下記式(X)で表される、[3]に記載のレジスト組成物。
前記式(3)中、R’が、下記式(2)で表される、[1]~[4]のいずれかに記載のレジスト組成物。
[6]
前記式(3)中、Rが水素原子である、[1]~[5]のいずれかに記載のレジスト組成物。
[7]
前記式(3)で示される化合物が、ctt体又はccc体を70モル%以上有する、[1]~[6]のいずれかに記載のレジスト組成物。
[8]
前記式(3)で示される化合物が、下記化合物群から選ばれる少なくとも1種である、[1]~[7]のいずれかに記載のレジスト組成物。
可視光線、紫外線、エキシマレーザー、電子線、極端紫外線(EUV)、X線及びイオンビームからなる群より選択されるいずれか一種の放射線の照射により、直接的又は間接的に酸を発生する酸発生剤(C)をさらに含む、[1]~[8]のいずれかに記載のレジスト組成物。
[10]
酸架橋剤(G)をさらに含む、[1]~[9]のいずれかに記載のレジスト組成物。
[11]
酸拡散制御剤(E)をさらに含む、[1]~[10]のいずれかに記載のレジスト組成物。
[12]
前記固形成分中におけるレジスト基材、酸発生剤(C)、酸架橋剤(G)、酸拡散制御剤(E)及び任意成分(F)の割合(レジスト基材/酸発生剤(C)/酸架橋剤(G)/酸拡散制御剤(E)/任意成分(F))が、質量%基準で、20~99.498/0.001~49/0.5~49/0.001~49/0~49の範囲である、[11]に記載のレジスト組成物。
[13]
スピンコートによりアモルファス膜を形成することができる、[1]~[12]のいずれかに記載のレジスト組成物。
[14]
前記アモルファス膜の23℃における現像液に対する溶解速度が、10Å/sec以上である、[13]に記載のレジスト組成物。
[15]
KrFエキシマレーザー、極端紫外線、電子線若しくはX線を照射した後の前記アモルファス膜、又は、20~250℃で加熱した後の前記アモルファス膜の、現像液に対する溶解速度が5Å/sec以下である、[13]又は[14]に記載のレジスト組成物。
[16]
[1]~[15]のいずれかに記載のレジスト組成物を基板上に塗布し、レジスト膜を形成する工程と、
前記レジスト膜を露光する工程と、
露光したレジスト膜を現像する工程と、
を備える、レジストパターン形成方法。
(レジスト組成物)
本実施形態のレジスト組成物は、レジスト基材を含む固形成分と溶媒とを含有するレジスト組成物であって、
前記レジスト組成物中の固形成分が1~80質量%、溶媒が20~99質量%の範囲であり、
前記レジスト基材が下記式(1)で表される化合物(ctt体)と下記式(3)で表される化合物とを含有し、
前記レジスト基材に占める下記式(1)で表される化合物(ctt体)の割合が65~99質量%であり、かつ
下記式(1)で表される化合物(ctt体)に対する下記式(3)で表される化合物の質量比率が0.01~0.53である。
本実施形態のレジスト組成物は、このように構成されているため、安全溶媒に対する溶解性が高く、高感度で、ラフネスが小さく、かつ良好なレジストパターン形状を安定的に与えることができる。すなわち、本実施形態のレジスト組成物は酸増幅型低分子系レジスト材料として有用である。
置換の複素環基としては、特に限定されないが、例えば、N-メチルピリジル基、N-フルオロピリジル基、N-ヒドロキシピリジル基、N-シアノピリジル基、メチルビピリジル基、メチルピロリジル基、メチルピラゾリル基、メチルイミダゾリル基、メチルイソオキサゾリル基、メチルイソチアゾリル基、メチルピペリジル基、メチルピペラジル基、メチルモルフォリル基、メチルチオモルフォリル基、メチルトリアゾール基、メチルテトラゾール基等が挙げられる。
置換の炭素数1~20の直鎖状脂肪族炭化水素基としては、特に限定されないが、例えば、フルオロメチル基、2-ヒドロキシエチル基、3-シアノプロピル基、20-ニトロオクタデシル基等が挙げられる。
置換の炭素数3~20の分岐状脂肪族炭化水素基としては、特に限定されないが、例えば、1-フルオロイソプロピル基、1-ヒドロキシ-2-オクタデシル基等が挙げられる。
置換の炭素数3~14の環状脂肪族炭化水素基としては、特に限定されないが、例えば、2-フルオロシクロプロピル基、4-シアノシクロヘキシル基、4-メチルシクロヘキシル基、4-エチルシクロヘキシル基等が挙げられる。
置換の炭素数6~20のアリール基としては、特に限定されないが、例えば、4-イソプロピルフェニル基、4-メチルフェニル基、6-フルオロナフチル基等が挙げられる。
置換の炭素数7~30のアラルキル基としては、特に限定されないが、例えば、4-フルオロ-3-メチルフェニル基等が挙げられる。
置換の炭素数1~20のアルコキシ基としては、特に限定されないが、例えば、クロロメトキシ基、ブロモエトキシ基等が挙げられる。
置換の炭素数0~20のアミノ基としては、特に限定されないが、例えば、クロロメチルアミノ基、ジブロモメチルアミノ基等が挙げられる。
置換の炭素数2~20のアルケニル基としては、特に限定されないが、例えば、クロロプロピニル基等が挙げられる。
置換の炭素数1~20のアシル基としては、特に限定されないが、例えば、クロロアセチル基等が挙げられる。
置換の炭素数2~20のアルコキシカルボニル基としては、特に限定されないが、例えば、クロロメトキシカルボニル基等が挙げられる。
置換の炭素数1~20のアルキロイルオキシ基としては、特に限定されないが、例えば、クロロメトキシカルボニルオキシ基等が挙げられる。
置換の炭素数7~30のアリーロイルオキシ基としては、特に限定されないが、例えば、クロロベンゾイルオキシ基等が挙げられる。
置換の炭素数1~20のアルキルシリル基としては、特に限定されないが、例えば、クロロメチルシリル基等が挙げられる。
式(1)及び式(3)で表される化合物を構成する立体異性体としては、(ccc)異性体、(ctt)異性体、(cct)異性体、(tct)異性体が挙げられる。具体的には、2つのROをもつ芳香環が、2つのROのパラ位でメチン基を介して、環を巻いた16員環のオリゴマーである。ここで、16員環の平面に対して、4つのメチン基についた置換基は、各々が上向きと下向きの結合があるため、各々にシス・トランス異性体(立体異性体)が存在する。
(ccc)とは、ある1つのメチン基についた置換基に対して、時計回りの順にシス-シス-シスの向きに立体結合した構造をとる化合物である。
(ctt)とは、ある1つのメチン基についた置換基に対して、時計回りの順にシス-トランス-トランスの向きに立体結合した構造をとる化合物である。
(cct)とは、ある1つのメチン基についた置換基に対して、時計回りの順にシス-シス-トランスの向きに立体結合した構造をとる化合物である。
(tct)とは、ある1つのメチン基についた置換基に対して、時計回りの順にトランス-シス-トランスの向きに立体結合した構造をとる化合物である。
本実施形態は、これらのレジスト材料用途において、カリックス[4]レゾルシンアレンの多モードの異性体構造分布を制御することで、上記課題の解決に有効であり、かつ安全溶媒に対する溶解性が高く、高感度で、ラフネスが小さく、かつ、良好なレジストパターン形状を安定的に得ることを可能とするものである。
1-分岐アルキル基としては、通常、炭素数3~20の1-分岐アルキル基であり、炭素数5~18の1-分岐アルキル基が好ましく、炭素数7~16の分岐アルキル基がさらに好ましい。1-分岐アルキル基としては、以下に限定されないが、例えば、イソプロピル基、sec-ブチル基、tert-ブチル基、1,1-ジメチルプロピル基、1-メチルブチル基、1,1-ジメチルブチル基、2-メチルアダマンチル基、2-エチルアダマンチル基等を挙げることができる。
アシル基としては、通常、炭素数2~20のアシル基であり、炭素数4~18のアシル基が好ましく、炭素数6~16のアシル基がさらに好ましい。アシル基としては、以下に限定されないが、例えば、アセチル基、フェノキシアセチル基、プロピオニル基、ブチリル基、ヘプタノイル基、ヘキサノイル基、バレリル基、ピバロイル基、イソバレリル基、ラウリロイル基、アダマンチルカルボニル基、ベンゾイル基、ナフトイル基等を挙げることができる。
環状エーテル基としては、通常、炭素数2~20の環状エーテル基であり、炭素数4~18の環状エーテル基が好ましく、炭素数6~16の環状エーテル基がさらに好ましい。環状エーテル基としては、以下に限定されないが、例えば、テトラヒドロピラニル基、テトラヒドロフラニル基、テトラヒドロチオピラニル基、テトラヒドロチオフラニル基、4-メトキシテトラヒドロピラニル基、4-メトキシテトラヒドロチオピラニル基等を挙げることができる。
特に下記式(13-4)で示される各基からなる群から選ばれる酸解離性官能基が、解像性が高く好ましい。
上記酸発生剤(C)は、単独で又は2種以上を使用することができる。
前記酸架橋剤(G1)は、例えば、尿素化合物又はグリコールウリル化合物、及びホルマリンを縮合反応させてメチロール基を導入した後、さらにメチルアルコール、エチルアルコール、プロピルアルコール、ブチルアルコール等の低級アルコール類でエーテル化し、次いで反応液を冷却して析出する化合物又はその樹脂を回収することで得られる。また前記酸架橋剤(G1)は、CYMEL(商品名、三井サイアナミッド製)、ニカラック(三和ケミカル(株)製)のような市販品としても入手することができる。
アルコキシメチル基を有するフェノール誘導体は、対応するヒドロキシメチル基を有するフェノール誘導体とアルコールを酸触媒下で反応させることによって得ることができる。この際、樹脂化やゲル化を防ぐために、反応温度を100℃以下で行うことが好ましい。具体的には、EP632003A1等に記載されている方法にて合成することができる。
低分子量溶解促進剤は、式(1)で表される化合物と式(3)で表される化合物の現像液に対する溶解性が低すぎる場合に、その溶解性を高めて、現像時の式(1)で表される化合物と式(3)で表される化合物の溶解速度を適度に増大させる作用を有する成分であり、本実施形態の効果を損なわない範囲で使用することができる。前記溶解促進剤としては、以下に限定されないが、例えば、低分子量のフェノール性化合物を挙げることができ、具体的には、ビスフェノール類、トリス(ヒドロキシフェニル)メタン等を挙げることができる。これらの溶解促進剤は、単独で又は2種以上を混合して使用することができる。溶解促進剤の配合量は、使用する式(1)で表される化合物と式(3)で表される化合物の種類に応じて適宜調節されるが、固形成分全質量の0~49質量%が好ましく、0~5質量%がより好ましく、0~1質量%がさらに好ましく、0質量%が特に好ましい。
溶解制御剤は、式(1)で表される化合物と式(3)で表される化合物が現像液に対する溶解性が高すぎる場合に、その溶解性を制御して現像時の溶解速度を適度に減少させる作用を有する成分である。このような溶解制御剤としては、レジスト被膜の焼成、放射線照射、現像等の工程において化学変化しないものが好ましい。
溶解制御剤の配合量は、使用する式(1)で表される化合物と式(3)で表される化合物の種類に応じて適宜調節されるが、固形成分全質量の0~49質量%が好ましく、0~5質量%がより好ましく、0~1質量%がさらに好ましく、0質量%が特に好ましい。
増感剤は、照射された放射線のエネルギーを吸収して、そのエネルギーを酸発生剤(C)に伝達し、それにより酸の生成量を増加する作用を有し、レジストの見掛けの感度を向上させる成分である。このような増感剤としては以下に限定されないが、、例えば、ベンゾフェノン類、ビアセチル類、ピレン類、フェノチアジン類、フルオレン類等を挙げることができる。これらの増感剤は、単独で又は2種以上を使用することができる。増感剤の配合量は、使用する式(1)で表される化合物と式(3)で表される化合物の種類に応じて適宜調節されるが、固形成分全質量の0~49質量%が好ましく、0~5質量%がより好ましく、0~1質量%がさらに好ましく、0質量%が特に好ましい。
界面活性剤は、本実施形態のレジスト組成物の塗布性やストリエーション、レジストの現像性等を改良する作用を有する成分である。このような界面活性剤は、特に限定されず、アニオン系、カチオン系、ノニオン系あるいは両性のいずれでもよい。好ましい界面活性剤はノニオン系界面活性剤である。ノニオン系界面活性剤は、レジスト組成物の製造に用いる溶媒との親和性がよく、より効果がある。ノニオン系界面活性剤の例としては、以下に限定されないが、ポリオキシエチレン高級アルキルエーテル類、ポリオキシエチレン高級アルキルフェニルエーテル類、ポリエチレングリコールの高級脂肪酸ジエステル類等が挙げられる。市販品としては、特に限定されないが、例えば、以下商品名で、エフトップ(ジェムコ社製)、メガファック(大日本インキ化学工業社製)、フロラード(住友スリーエム社製)、アサヒガード、サーフロン(以上、旭硝子社製)、ペポール(東邦化学工業社製)、KP(信越化学工業社製)、ポリフロー(共栄社油脂化学工業社製)等を挙げることができる。界面活性剤の配合量は、使用する式(1)で表される化合物と式(3)で表される化合物の種類に応じて適宜調節されるが、固形成分全質量の0~49質量%が好ましく、0~5質量%がより好ましく、0~1質量%がさらに好ましく、0質量%が特に好ましい。
感度劣化防止又はレジストパターン形状、引き置き安定性等の向上の目的で、さらに任意の成分として、有機カルボン酸又はリンのオキソ酸若しくはその誘導体を含有させることができる。なお、酸拡散制御剤と併用することも出来るし、単独で用いてもよい。有機カルボン酸としては、特に限定されないが、例えば、マロン酸、クエン酸、リンゴ酸、コハク酸、安息香酸、サリチル酸などが好適である。リンのオキソ酸若しくはその誘導体としては、以下に限定されないが、リン酸、リン酸ジ-n-ブチルエステル、リン酸ジフェニルエステルなどのリン酸又はそれらのエステルなどの誘導体;ホスホン酸、ホスホン酸ジメチルエステル、ホスホン酸ジ-n-ブチルエステル、フェニルホスホン酸、ホスホン酸ジフェニルエステル、ホスホン酸ジベンジルエステルなどのホスホン酸又はそれらのエステルなどの誘導体;ホスフィン酸、フェニルホスフィン酸などのホスフィン酸又はそれらのエステルなどの誘導体が挙げられ、これらの中で特にホスホン酸が好ましい。
有機カルボン酸又はリンのオキソ酸若しくはその誘導体は、単独で又は2種以上を使用することができる。有機カルボン酸又はリンのオキソ酸若しくはその誘導体の配合量は、使用する式(1)で表される化合物と式(3)で表される化合物の種類に応じて適宜調節されるが、固形成分全質量の0~49質量%が好ましく、0~5質量%がより好ましく、0~1質量%がさらに好ましく、0質量%が特に好ましい。
更に、本実施形態のレジスト組成物には、本実施形態の目的を阻害しない範囲で、必要に応じて、上記溶解制御剤、増感剤、及び界面活性剤以外の添加剤を1種又は2種以上配合することができる。そのような添加剤としては、以下に限定されないが、例えば、染料、顔料、及び接着助剤等が挙げられる。例えば、染料又は顔料を配合すると、露光部の潜像を可視化させて、露光時のハレーションの影響を緩和できるので好ましい。また、接着助剤を配合すると、基板との接着性を改善することができるので好ましい。更に、他の添加剤としては、ハレーション防止剤、保存安定剤、消泡剤、形状改良剤等、具体的には4-ヒドロキシ-4’-メチルカルコン等を挙げることができる。
本実施形態のレジストパターン形成方法は、本実施形態のレジスト組成物を基板上に塗布し、レジスト膜を形成する工程と、前記レジスト膜を露光する工程と、露光したレジスト膜を現像する工程と、を備える。レジストパターンは、多層プロセスにおける上層レジストとして形成することもできる。
温度を制御できる内容積500mlの電磁撹拌装置付オートクレーブ(SUS316L製)に、無水HF 74.3g(3.71モル)、BF3 50.5g(0.744モル)を仕込んだ。次いで、内容物を撹拌し、液温を-30℃に保ったまま一酸化炭素により2MPaまで昇圧した。その後、圧力を2MPa、液温を-30℃に保ったまま、4-シクロヘキシルベンゼン57.0g(0.248モル)とn-ヘプタン50.0gとを混合した原料を供給し、1時間保持した。その後、氷の中に内容物を採取し、ベンゼンで希釈後、中和処理をして得られた油層をガスクロマトグラフィーで分析して反応成績を求めた。その結果、4-シクロヘキシルベンゼン転化率100%、4-シクロヘキシルベンズアルデヒド選択率97.3%であった。
単蒸留により目的成分を単離し、GC-MSで分析した結果、目的物の4-シクロヘキシルベンズアルデヒド(以下、CHBALと示す)の分子量188を示した。また重クロロホルム溶媒中での1H-NMRのケミカルシフト値(δppm,TMS基準)は、1.0~1.6(m,10H)、2.6(m,1H)、7.4(d,2H)、7.8(d,2H)、10.0(s,1H)であった。
十分乾燥し、窒素置換した滴下漏斗、ジム・ロート氏冷却管、温度計、攪拌翼を設置した四つ口フラスコ(500mL)に、窒素気流下で、レゾルシノール(関東化学社製、23.1g、0.2mol)と、エタノール(190g)を投入し、エタノール溶液を調製した。この溶液を氷冷し、5~15℃で冷却撹拌しながら、濃硫酸(97%、18.5g、0.2mol)と、純水23.9gを滴下漏斗により10分かけて滴下した後、前記CHBAL(4-シクロヘキシルベンズアルデヒド、37.7g,0.2mol)とエタノール(21g)を滴下した。その後、マントルヒーターで80℃まで加熱、5時間攪拌した。反応終了後、放冷し、室温に到達させた後、氷浴で冷却した。1時間静置後、淡黄色の目的粗結晶が析出し、これを濾別した。粗結晶をメタノール500mLで3回、純水500mLで5回洗浄し、真空乾燥させることにより、42.5gの淡黄色の生成物(以下、CR-1と示す)を得た。
この生成物を高速液体クロマトグラフィー(以下、HPLCと示す)で分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が49.9/49.9/0.2であった。この生成物40gをテトラヒドロフラン8L/ヘキサン8Lの混合溶液で2度の再結晶を行った。
2度目の再結晶から得た濾液濃縮物11gを、酢酸エチル100mLで3度目の再結晶を行い、白色結晶物9gを得た。
この結晶物(以下、CR-1tと称す)をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が3.1/96.9/0.0であった。また、この精製物の熱分解温度は407℃であった。また、ガラス転移温度は180℃であった。
このCR-1の(ctt)異性体の構造は、GPCで分析した結果、スチレン換算の数平均分子量Mn979、重量平均分子量Mw986を示した。また重アセトニトリル溶媒中での1H-NMRのケミカルシフト値(δppm,TMS基準)は0.8~1.9(m,44H)、5.5(s,4H)、6.0~6.4(d,8H)、6.6~6.7(m,16H)、8.4,8.5(m,8H)であった。
これらの結果から、得られた生成物を目的化合物(CR-1)の(ctt)異性体と同定した。
2度目の再結晶から得た結晶物22gを、酢酸エチル800mLで3度目の再結晶を行い、白色結晶物10gを得た。この結晶物(以下、CR-1cと称す)をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が97.6/2.4/0.0であった。また、この精製物の熱分解温度は350℃であった。また、ガラス転移温度は186℃であった。
この生成物の(ccc)異性体の構造は、GPCで分析した結果、スチレン換算の数平均分子量Mn979、重量平均分子量Mw986を示した。また重アセトニトリル溶媒中での1H-NMRのケミカルシフト値(δppm,TMS基準)は0.8~1.9(m,44H)、5.6(s,4H)、6.1~6.5(d,8H)、6.7~6.9(m,16H)、8.5(m,8H)であった。
これらの結果から、得られた生成物を目的化合物(CR-1)の(ccc)異性体と同定した。
4-シクロヘキシルベンズアルデヒドの代わりに、Cumal(三菱ガス化学製、4-イソプロピルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、13gの生成物(以下、CR-2tと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、0.8/99.2/0.0であった。
4-シクロヘキシルベンズアルデヒドの代わりに、IBBAL(三菱ガス化学製、4-イソブチルベンズアルデヒドを用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、16.0gの生成物(以下、CR-4tと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、0.6/99.4/0.0であった。
4-シクロヘキシルベンズアルデヒドの代わりに、NPBAL(三菱ガス化学製、4-ノルマルプロピルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、15.7gの生成物(以下、CR-5tと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、0.3/99.7/0.0であった。
4-シクロヘキシルベンズアルデヒドの代わりに、BPAL(三菱ガス化学製、4-フェニルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、1.7gの生成物(以下、CR-8tと称す)を得た。また、2度目の再結晶から得た結晶物を用いて酢酸エチルで3度目の再結晶を行い、5.4gの生成物(以下、CR-8cと称す)を得た。これらの生成物をHPLCで分析した結果、それぞれ(ccc)異性体/(ctt)異性体/その他異性体の組成比が、0.0/99.8/0.2及び(ccc)異性体/(ctt)異性体/その他異性体の組成比が、98.3/1.4/2.3であった。
4-シクロヘキシルベンズアルデヒドの代わりに、EV(豊玉香料株式会社製、エチルバニリン)を用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、2.2gの生成物(以下、CR-10tと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、2.7/97.3/0.0であった。
4-シクロヘキシルベンズアルデヒドの代わりに、3,4-DBAL(三菱ガス化学製、3,4-ジメチルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た結晶物を用いて酢酸エチルで3度目の再結晶を行い、5.3gの生成物(以下、CR-11cと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、99.9/0.0/0.1であった。
4-シクロヘキシルベンズアルデヒドの代わりに、PTAL(三菱ガス化学製、p-トルアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た結晶物を用いて酢酸エチルで3度目の再結晶を行い、0.5gの生成物(以下、CR-12cと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、99.9/0.1/0.0であった。
4-シクロヘキシルベンズアルデヒドの代わりに、EBAL(三菱ガス化学製、4-エチルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た結晶物を用いて酢酸エチルで3度目の再結晶を行い、5.2gの生成物(以下、CR-13cと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、99.7/0.2/0.1であった。
4-シクロヘキシルベンズアルデヒドの代わりに、2,4-DBAL(三菱ガス化学製、2,4-ジメチルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、9.4gの生成物(以下、CR-15tと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、0.0/96.3/3.7であった。
4-シクロヘキシルベンズアルデヒドの代わりに、TBAL(三菱ガス化学製、2,4,5-トリメチルベンズアルデヒド)を用い、その他は合成例1と同様にした。2度目の再結晶から得た濾液濃縮物を用いて酢酸エチルで3度目の再結晶を行い、1.3gの生成物(以下、CR-17tと称す)を得た。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/その他異性体の組成比が、0.0/96.0/4.0であった。
上記合成例1で合成、精製した生成物CR-1を使用した。この生成物をHPLCで分析した結果、(ccc)異性体/(ctt)異性体/(cct)異性体の組成比が、49.9/49.9/0.2であった。
(1)パターニング試験
表1に記載のとおりに各成分を調合し、均一溶液としたのち、孔径0.1μmテフロン製メンブレンフィルターでろ過し、各例に対応するレジスト組成物を調製し、各々について下記の評価を行った。評価結果を表2に示す。
酸発生剤(C)
P-1:トリフェニルベンゼンスルホニウム トリフルオロメタンスルホネート(みどり化学(株))
酸架橋剤(G)
C-1:ニカラックMW-100LM(三和ケミカル(株))
酸拡散制御剤(E)
Q-1:トリオクチルアミン(東京化成工業(株))
溶媒
S-1:プロピレングリコールモノメチルエーテル(東京化成工業(株))
得られたラインアンドスペースを走査型電子顕微鏡((株)日立ハイテクノロジー製S-4800)により観察した。またその際のドーズ量(μC/cm2)を感度の指標とした。得られたドーズ量から、下記の基準に基づいて感度を評価した。
1:ドーズ量≦45μC/cm2 (優秀な感度)
2:45μC/cm2<ドーズ量≦60μC/cm2 (良好な感度)
3:60μC/cm2<ドーズ量 (感度不良)
A:LER≦4.0nm (優秀なLER)
B:4.0nm<LER≦8.0nm (良好なLER)
C:8.0nm<LER (倒れのあるパターンを含む)
D:パターンなし・潰れ
Claims (16)
- レジスト基材を含む固形成分と溶媒とを含有するレジスト組成物であって、
前記レジスト組成物中の固形成分が1~80質量%、溶媒が20~99質量%の範囲であり、
前記レジスト基材が下記式(1)で表される化合物(ctt体)と下記式(3)で表される化合物とを含有し、
前記レジスト基材に占める下記式(1)で表される化合物(ctt体)の割合が65~99質量%であり、かつ
下記式(1)で表される化合物(ctt体)に対する下記式(3)で表される化合物の質量比率が0.01~0.53である、レジスト組成物。
- 前記式(1)中、Rが水素原子である、請求項1に記載のレジスト組成物。
- 前記式(1)中、pが1である、請求項1又は2に記載のレジスト組成物。
- 前記式(3)中、Rが水素原子である、請求項1~5のいずれか1項に記載のレジスト組成物。
- 前記式(3)で示される化合物が、ctt体又はccc体を70モル%以上有する、請求項1~6のいずれか1項に記載のレジスト組成物。
- 可視光線、紫外線、エキシマレーザー、電子線、極端紫外線(EUV)、X線及びイオンビームからなる群より選択されるいずれか一種の放射線の照射により、直接的又は間接的に酸を発生する酸発生剤(C)をさらに含む、請求項1~8のいずれか1項に記載のレジスト組成物。
- 酸架橋剤(G)をさらに含む、請求項1~9のいずれか1項に記載のレジスト組成物。
- 酸拡散制御剤(E)をさらに含む、請求項1~10のいずれか1項に記載のレジスト組成物。
- 前記固形成分中におけるレジスト基材、酸発生剤(C)、酸架橋剤(G)、酸拡散制御剤(E)及び任意成分(F)の割合(レジスト基材/酸発生剤(C)/酸架橋剤(G)/酸拡散制御剤(E)/任意成分(F))が、質量%基準で、20~99.498/0.001~49/0.5~49/0.001~49/0~49の範囲である、請求項11に記載のレジスト組成物。
- スピンコートによりアモルファス膜を形成することができる、請求項1~12のいずれか1項に記載のレジスト組成物。
- 前記アモルファス膜の23℃における現像液に対する溶解速度が、10Å/sec以上である、請求項13に記載のレジスト組成物。
- KrFエキシマレーザー、極端紫外線、電子線若しくはX線を照射した後の前記アモルファス膜、又は、20~250℃で加熱した後の前記アモルファス膜の、現像液に対する溶解速度が5Å/sec以下である、請求項13又は14に記載のレジスト組成物。
- 請求項1~15のいずれか1項に記載のレジスト組成物を基板上に塗布し、レジスト膜を形成する工程と、
前記レジスト膜を露光する工程と、
露光したレジスト膜を現像する工程と、
を備える、レジストパターン形成方法。
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US20160124303A1 (en) | 2016-05-05 |
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