WO2014123032A1 - レジスト組成物、レジストパターン形成方法及びそれに用いるポリフェノール誘導体 - Google Patents
レジスト組成物、レジストパターン形成方法及びそれに用いるポリフェノール誘導体 Download PDFInfo
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- WO2014123032A1 WO2014123032A1 PCT/JP2014/051775 JP2014051775W WO2014123032A1 WO 2014123032 A1 WO2014123032 A1 WO 2014123032A1 JP 2014051775 W JP2014051775 W JP 2014051775W WO 2014123032 A1 WO2014123032 A1 WO 2014123032A1
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- 0 [*-]c(cccc1)c1O Chemical compound [*-]c(cccc1)c1O 0.000 description 3
- UMOFRKGIUFGXNG-OQFOIZHKSA-N C/C=C(/C=CC=C1)\C1=C Chemical compound C/C=C(/C=CC=C1)\C1=C UMOFRKGIUFGXNG-OQFOIZHKSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/78—Ring systems having three or more relevant rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/017—Esters of hydroxy compounds having the esterified hydroxy group bound to a carbon atom of a six-membered aromatic ring
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/66—Esters of carboxylic acids having esterified carboxylic groups bound to acyclic carbon atoms and having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety
- C07C69/73—Esters of carboxylic acids having esterified carboxylic groups bound to acyclic carbon atoms and having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety of unsaturated acids
- C07C69/734—Ethers
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/96—Esters of carbonic or haloformic acids
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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
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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
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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
- G03F7/16—Coating processes; Apparatus therefor
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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
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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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
- C07C2601/14—The ring being saturated
Definitions
- the present invention relates to a resist composition and a resist pattern forming method using the same.
- the present invention also relates to a polyphenol derivative that can be used in the resist composition and the like.
- a general resist material known so far is a polymer material capable of forming an amorphous thin film.
- a polymer resist material such as polymethyl methacrylate, polyhydroxystyrene having an acid-dissociable reactive group, or polyalkyl methacrylate
- a line pattern of about 45 to 100 nm is formed by irradiation with ultraviolet rays, electron beams, extreme ultraviolet rays (EUV), X-rays and the like.
- 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 lithography using a conventional polymer resist material. Therefore, 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 polynuclear polyphenol compound as a main component has been proposed.
- an alkali developing negative radiation-sensitive composition using a low molecular weight cyclic polyphenol compound as a main component has also been proposed. ing.
- Non-Patent Document 2 a polyphenol compound as a base compound for a resist material is useful for imparting high heat resistance and improving resolution and roughness of a resist pattern while having a low molecular weight.
- compositions described in Patent Documents 1 and 2 are not sufficient in heat resistance and have a drawback that the shape of the resulting resist pattern is deteriorated.
- compositions described in Patent Document 3 and Non-Patent Document 1 have problems such as low solubility in a safe solvent used in a semiconductor manufacturing process, low sensitivity, and poor resist pattern shape obtained. Further improvements in low molecular weight resist materials are desired.
- Non-Patent Document 2 does not describe solubility, and the heat resistance of the described compound is not yet sufficient, and further improvements in various characteristics such as heat resistance, water resistance, chemical resistance, electrical characteristics, and mechanical characteristics. There is a need for improvement.
- An object of the present invention is to provide a resist composition that is excellent in heat resistance, has high solubility in a safe solvent, is highly sensitive, and can impart a good resist pattern shape, and a resist pattern forming method using the resist composition. There is. Another object of the present invention is to provide a polyphenol derivative having excellent heat resistance and high solubility in a safe solvent.
- the present inventors have found that the resist composition contains a compound having a specific structure, so that it has excellent heat resistance, high solubility in a safe solvent, high sensitivity, and The present inventors have found that a good resist pattern shape can be imparted and have completed the present invention.
- R 1 is a single bond or a 2n-valent hydrocarbon group having 1 to 30 carbon atoms
- the hydrocarbon group is a cyclic hydrocarbon group (however, an aromatic group is May have a double bond, a hetero atom, or an aromatic group having 6 to 30 carbon atoms
- each R 2 independently represents a hydrogen atom, a halogen atom, or a straight chain having 1 to 10 carbon atoms.
- the structural formula of the repeating unit in formula (1) and formula (2) is Or different and are identical to have, in the formula (1), m 1 is independently an integer of 1-7, In the formula (2), X represents an oxygen atom or independently Each is a sulfur atom, m 2 is each independently an integer of 1 to 6, and q is each independently 0 or 1.)
- the compound represented by the formula (1) is a compound represented by the following formula (1-1), and the compound represented by the formula (2) is represented by the formula (2-1).
- R 1 is a single bond or a 2n-valent hydrocarbon group having 1 to 30 carbon atoms
- the hydrocarbon group is a cyclic hydrocarbon group (provided that Except for an aromatic group.)
- each R 3 independently represents a hydrogen atom, or a carbon atom having 1 to 10 carbon atoms.
- R 4 is each independently a hydrogen atom or an acid dissociable group, and at least one of R 4 is an acid dissociable group, and in formulas (1-1) and (2-1),
- the structural formulas of the repeating units may be the same or different, and n is 1 to In Formula (1-1), m 3 is each independently an integer of 1 to 7, m 4 is each independently an integer of 0 to 6, and m 3 + m 4 is Each independently represents an integer of 1 to 7, and in formula (2-1), m 5 is each independently an integer of 1 to 6, m 6 is each independently an integer of 0 to 5, m 5 + m 6 are each independently an integer of 1 to 6, and q are each independently 0 or 1.) [3]
- the compound represented by the formula (1) is a compound represented by the following formula (1-2), and the compound represented by the formula (2) is represented by the following formula (2-2).
- R 1 is a single bond or a 2n-valent hydrocarbon group having 1 to 30 carbon atoms
- the hydrocarbon group is a cyclic hydrocarbon group (provided that Except for an aromatic group.)
- each R 3 independently represents a hydrogen atom, or a carbon atom having 1 to 10 carbon atoms.
- R 4 is independently a hydrogen atom or an acid-dissociable group, and at least one of R 4 is an acid-dissociable group, and in formulas (1-2) and (2-2),
- the structural formulas of the repeating units may be the same or different, and n is 1 to In formula (1-2), each m 4 is independently an integer from 0 to 6, and in formula (2-2), m 6 is each independently an integer from 0 to 5. Each q is independently 0 or 1.)
- the compound represented by the formula (1) is a compound represented by the following formula (3), and the compound represented by the formula (2) is a compound represented by the formula (4).
- X ′ is a hydrogen atom or a monovalent substituent having 1 to 18 carbon atoms
- R 0 is independently an alkyl group having 1 to 4 carbon atoms or A halogen atom, which may be the same or different from each other in the same naphthalene ring or benzene ring
- each R 4 is independently a hydrogen atom or an acid dissociable group, and at least one of R 4 Are acid dissociable groups
- p is each independently an integer of 0 to 5
- q is 0 or 1.
- X ′ is a hydrogen atom or a monovalent substituent having 1 to 18 carbon atoms
- R 0 is independently an alkyl group having 1 to 4 carbon atoms or A halogen atom, which may be the same or different from each other in the same naphthalene ring or benzene ring
- each R 4 is independently a hydrogen atom or an acid dissociable group, and at least one of R 4 Are acid dissociable groups
- p is each independently an integer of 0 to 5, and q is 0 or 1.
- a resist composition that is excellent in heat resistance, has high solubility in a safe solvent, has high sensitivity, and can impart a good resist pattern shape, and a resist pattern forming method using the resist composition. Further, according to the present invention, a polyphenol derivative having excellent heat resistance and high solubility in a safe solvent can be provided.
- the present embodiment is an example for explaining the present invention, and the present invention is not limited to this embodiment.
- the present invention can be variously modified without departing from the gist thereof.
- the resist composition of the present embodiment contains a compound represented by the above formula (1) or (2).
- the resist composition contains a compound represented by the following formula (1).
- the chemical structure of the compound of this embodiment can be determined by 1 H-NMR analysis.
- the compound represented by the above formula (1) is excellent in heat resistance mainly because it has a naphthalene skeleton.
- R 1 is a single bond or a 2n-valent hydrocarbon group having 1 to 30 carbon atoms
- the hydrocarbon group is a cyclic hydrocarbon group (excluding an aromatic group), two It may have a heavy bond, a hetero atom or an aromatic group having 6 to 30 carbon atoms
- each R 2 independently represents a hydrogen atom, a halogen atom, a straight chain or branched chain having 1 to 10 carbon atoms.
- R 2 may be the same as or different from each other, and at least one of R 2 is a group in which a hydrogen atom of a hydroxyl group is substituted with an acid-dissociable group, and q is independently 0 or 1.
- the structural formulas of the repeating units may be the same or different, and m 1 is each independently an integer of 1 to 7, and n is an integer of 1 to 4. From the viewpoint of resist properties such as heat resistance, resolution, and roughness, n is preferably 1 to 3. Further, q is preferably 1. That is, the compound represented by the above formula (1) is preferably one represented by the following formula (1-a). In formula (1-a), R 1 , R 2 , m 1 and n have the same meaning as in formula (1) above.
- R 1 is a single bond or a carbon number of 1 to 30 (hereinafter, “carbon number k to l” (k and l are integers) may be referred to as “Ck to l”.)
- the hydrocarbon group may have a cyclic hydrocarbon group, a double bond, a hetero atom, or a C6-30 aromatic group.
- the 2n-valent hydrocarbon group examples include those having a linear, branched or cyclic structure.
- the 2n-valent hydrocarbon group includes a cyclic hydrocarbon group (excluding an aromatic group), a double bond, a hetero atom (for example, an oxygen atom, a nitrogen atom and a sulfur atom), or a C6-30 aromatic group. It may have a group (for example, a group having a benzene ring, a naphthalene ring or an anthracene ring).
- the cyclic hydrocarbon group includes a bridged cyclic hydrocarbon group, and specifically includes a group having an adamantane ring, a group having a norbornene ring, and a group having a tricyclodecane structure. .
- R 1 preferably has a condensed polycyclic aromatic group (especially a condensed ring structure having 2 to 4 rings) from the viewpoint of heat resistance. From the viewpoint of solubility in a safety solvent and heat resistance, R 1 It preferably has a polyphenyl group.
- Each R 2 independently represents a hydrogen atom, a halogen atom, a C1-10 linear, branched or cyclic alkyl group, a C6-10 aryl group, a C2-10 alkenyl group, a hydroxyl group or a hydroxyl group hydrogen;
- An atom is a group substituted by an acid dissociable group, and may be the same or different from each other in the same naphthalene ring or benzene ring, and at least one of R 2 is a hydroxyl atom of a hydroxyl group
- m 1 is each independently an integer of 1 to 7;
- preferred R 2 is a hydrogen atom, a C1-10 linear, branched or cyclic alkyl group, a C6-10 aryl group, a C2-10 alkenyl group, or It is a hydroxyl group.
- the compound represented by the above formula (1) has high heat resistance due to its rigidity despite its low molecular weight, and can be used even under high temperature baking conditions. Further, since it has a low molecular weight and can be baked at a high temperature, it has high sensitivity and can provide a good resist pattern shape.
- the compound represented by the above formula (1) is preferably a compound represented by the following formula (1-1) from the viewpoints of solubility in a safe solvent and characteristics of a resist pattern. .
- R 1 has the same meaning as in formula (1) above.
- Each R 3 is independently a hydrogen atom, a C1-10 linear, branched or cyclic alkyl group, a C6-10 aryl group, or a C2-10 alkenyl group, the same naphthalene ring or In the benzene ring, they may be the same or different from each other, and each R 4 is independently a hydrogen atom or an acid dissociable group, at least one of R 4 is an acid dissociable group,
- the structural formulas of repeating units in 1-1) and formula (2-1) may be the same or different.
- n is an integer of 1 to 4.
- Each q is independently 0 or 1, but q is preferably 1. That is, the compound that is newly summed by the above formula (1-1) is preferably a compound represented by the following formula (1-1-a).
- R 1 , R 3 , R 4 , n, m 3 and m 4 have the same meanings as in the above formula (1-1). That is, each R 4 is independently an acid dissociable group or a hydrogen atom, and at least one is an acid dissociable group.
- the “acid-dissociable group” refers to a characteristic group that is cleaved in the presence of an acid to cause a change such as an alkali-soluble group. Examples of the alkali-soluble group include 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 group may be 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. it can.
- the acid-dissociable group preferably has a property of causing a chain-breaking reaction in the presence of an acid in order to enable pattern formation with higher sensitivity and higher resolution.
- the acid dissociable group examples include a substituted methyl group, 1-substituted ethyl group, 1-substituted-n-propyl group, 1-branched alkyl group, silyl group, acyl group, 1-substituted alkoxymethyl group, cyclic ether Groups, alkoxycarbonyl groups and alkoxycarbonylalkyl groups. It is preferable that the acid dissociable group does not have a 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.
- Specific examples of the substituted methyl group include 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-methoxyphenacyl group, Examples include a piperonyl group and a substituent represented by the following formula (13-1).
- examples of R 2 in the following formula (13-1) include a methyl group, an ethyl group, an isopropyl group, an n-propyl group, a t-butyl group, and an n-butyl group.
- 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 1-substituted ethyl group having 7 to 16 carbon atoms. preferable.
- Specific examples of the 1-substituted ethyl group include 1-methoxyethyl group, 1-methylthioethyl group, 1,1-dimethoxyethyl group, 1-ethoxyethyl group, 1-ethylthioethyl group, 1,1-diethoxy.
- R 2 has the same meaning as in formula (13-1) above.
- 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 to 8 carbon atoms. Sixteen 1-substituted-n-propyl groups are more preferred. Specific examples of the 1-substituted-n-propyl group include a 1-methoxy-n-propyl group and a 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 a 1-branched alkyl group having 7 to 16 carbon atoms. More preferred. Specific examples of the 1-branched alkyl group include isopropyl group, sec-butyl group, tert-butyl group, 1,1-dimethylpropyl group, 1-methylbutyl group, 1,1-dimethylbutyl group, 2-methyladamantyl group. And 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.
- Specific examples of the silyl group include trimethylsilyl group, ethyldimethylsilyl group, methyldiethylsilyl group, triethylsilyl group, tert-butyldimethylsilyl group, tert-butyldiethylsilyl group, tert-butyldiphenylsilyl group, tri-tert- A butyl silyl group and a triphenyl silyl group are mentioned.
- 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.
- Specific examples of the acyl group include 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 naphthoyl group. It is done.
- 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 alkoxymethyl group having 6 to 16 carbon atoms.
- a methyl group is more preferred.
- Specific examples of the 1-substituted alkoxymethyl group include 1-cyclopentylmethoxymethyl group, 1-cyclopentylethoxymethyl group, 1-cyclohexylmethoxymethyl group, 1-cyclohexylethoxymethyl group, 1-cyclooctylmethoxymethyl group and 1-cyclopentylmethoxymethyl group.
- 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.
- Specific examples of the cyclic ether group include a tetrahydropyranyl group, a tetrahydrofuranyl group, a tetrahydrothiopyranyl group, a tetrahydrothiofuranyl group, a 4-methoxytetrahydropyranyl group, and a 4-methoxytetrahydrothiopyranyl group.
- 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 a hydrogen atom 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 ethyl group Group, an alkoxycarbonyl group and an alkoxycarbonylalkyl group are more preferable because of high sensitivity, and have at least one structure selected from the group consisting of a cycloalkane having 3 to 12 carbon atoms, a lactone and an aromatic ring having 6 to 12 carbon atoms.
- An acid dissociable group 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 monocycloalkane, bicycloalkane, tricycloalkane and tetracycloalkane, and more specifically monocycloalkane such as cyclopropane, cyclobutane, cyclopentane and cyclohexane.
- Cycloalkanes; 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 and 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 group selected from the group consisting of groups represented by the following formula (13-4) is particularly preferable because of its high resolution.
- R 5 represents a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms
- R 6 independently represents a hydrogen atom, a linear or branched chain group having 1 to 4 carbon atoms
- n 1 is an integer of 0 to 4
- n 2 is each independently an integer of 1 to 5
- n 0 Are each independently an integer of 0-4.
- the compound represented by the above formula (1-1) is preferably a compound represented by the following formula (1-2) from the viewpoint of sensitivity when a resist composition is used.
- R 1 , R 3 , R 4 , m 4 , n and q are as defined in the above formula (1-1).
- the compound represented by the above formula (1-2) is more preferably q is 1, that is, a compound represented by the following formula (1-2-a).
- R 1 , R 3 , R 4 , m 4 and n have the same meanings as in formula (1-2) above.
- the compound represented by the above formula (1-1) is a compound in which m 3 in the above formula (1-1) is 2. preferable.
- the compound represented by the above formula (1-1) is a compound in which n in the above formula (1-1) is 1. preferable.
- the compound represented by the above formula (1-1) is more preferably a compound represented by the following formula (1-3).
- R 1 , R 3 , R 4 and m 4 have the same meaning as in formula (1-1).
- the compound represented by the above formula (1) is preferably a compound represented by the following formula (3).
- X ′ is a hydrogen atom or a monovalent substituent having 1 to 18 carbon atoms
- R 0 is each independently an alkyl group having 1 to 4 carbon atoms or a halogen atom, They may be the same or different from each other in the same naphthalene ring or benzene ring
- R 4 has the same meaning as in formula (1-1)
- p is independently an integer of 0 to 5
- Q is 0 or 1.
- the compound represented by the above formula (3) is preferably a compound represented by the following formula (3-1).
- X ′ is a hydrogen atom or a C1-18 monovalent substituent
- R 0 is each independently a C1-4 alkyl group or a halogen atom, and the same In the naphthalene ring, they may be the same or different from each other
- R 4 has the same meaning as in formula (1-1) above
- p is independently an integer of 0 to 5.
- a monovalent hydrocarbon group which may have a heteroatom is preferable, and a monovalent hydrocarbon group which does not have a heteroatom. Also good.
- This hydrocarbon group is preferably a monovalent hydrocarbon group having an aromatic ring, and examples of such a hydrocarbon group include a biphenyl group, a phenyl group, a naphthyl group, an anthracene group, and a pyrene group ( The same applies below). Of these, a biphenyl group is preferred.
- R 2 and m 1 have the same meaning as in the above formula (1).
- the method for producing the compound represented by the above formula (1) in the present embodiment is not particularly limited.
- a polyphenol compound is obtained by reacting naphthols or thionaphthols with a corresponding aldehyde or ketone in the presence of an acid catalyst, and at least one phenolic hydroxyl group of the polyphenol compound is acid dissociable by a known method.
- the naphthols are not particularly limited, and examples thereof include naphthol, methyl naphthol, methoxy naphthol, and naphthalene diol. Among these, use of naphthalene diol is preferable in that a xanthene structure can be easily obtained.
- the thionaphthols are not particularly limited, and examples thereof include naphthalene thiol, methyl naphthalene thiol, methoxynaphthalene thiol, and naphthalene dithiol.
- the phenols are not particularly limited, and examples thereof include phenol, methylphenol, methoxybenzene, catechol, resorcinol, hydroquinone, and trimethylhydroquinone.
- the thiophenols are not particularly limited, and examples thereof include benzenethiol, methylbenzenethiol, methoxybenzenethiol, benzenedithiol, and trimethylbenzenedithiol.
- aldehydes are not particularly limited. For example, formaldehyde, trioxane, paraformaldehyde, acetaldehyde, propylaldehyde, butyraldehyde, hexylaldehyde, decylaldehyde, undecylaldehyde, phenylacetaldehyde, phenylpropylaldehyde, furfural, benzaldehyde, hydroxy Benzaldehyde, fluorobenzaldehyde, chlorobenzaldehyde, nitrobenzaldehyde, methylbenzaldehyde, dimethylbenzaldehyde, ethylbenzaldehyde, propylbenzaldehyde, butylbenzaldehyde, cyclohexylbenzaldehyde, biphenylaldehyde, naphthaldehyde, anthracenecarboxaldeh
- benzaldehyde hydroxybenzaldehyde, fluorobenzaldehyde, chlorobenzaldehyde, nitrobenzaldehyde, methylbenzaldehyde, dimethylbenzaldehyde, ethylbenzaldehyde, propylbenzaldehyde, butylbenzaldehyde, cyclohexylbenzaldehyde, biphenylaldehyde, naphthaldehyde, anthracenecarboxaldehyde, phenanthrenecarboxaldehyde , Pyrenecarboxaldehyde, glyoxal, glutaraldehyde, phthalaldehyde, naphthalene dicarboxyaldehyde, biphenyl dicarboxaldehyde, anthracene dicarboxaldehyde, bis (diformylphenyl) methane, bis (di
- the ketones are not particularly limited, for example, acetone, methyl ethyl ketone, cyclobutanone, cyclopentanone, cyclohexanone, norbornanone, tricyclohexanone, tricyclodecanone, adamantanone, fluorenone, benzofluorenone, acenaphthenequinone, acenaphthenone, and Anthraquinone is mentioned.
- cyclopentanone, cyclohexanone, norbornanone, tricyclohexanone, tricyclodecanone, adamantanone, fluorenone, benzofluorenone, acenaphthenequinone, acenaphthenone, and anthraquinone are preferable in terms of providing high heat resistance.
- the acid catalyst is not particularly limited, and can be appropriately selected from known inorganic acids and organic acids.
- the acid catalyst include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, hydrobromic acid and hydrofluoric acid; oxalic acid, formic acid, p-toluenesulfonic acid, methanesulfonic acid, trifluoroacetic acid, trifluoromethanesulfonic acid, Organic acids such as benzene sulfonic acid, naphthalene sulfonic acid and naphthalene disulfonic acid; Lewis acids such as zinc chloride, aluminum chloride, iron chloride and boron trifluoride; and silicotungstic acid, phosphotungstic acid, silicomolybdic acid and phosphomolybdenum Examples include solid acids such as acids. From the viewpoint of production such as availability and ease of handling, the acid catalyst is preferably hydrochloric acid or sulfuric acid. An acid catalyst is used individually by 1
- a reaction solvent When producing the compound represented by the above formula (1), a reaction solvent may be used.
- the reaction solvent is not particularly limited as long as the reaction between the aldehyde or ketone to be used and the naphthol or thionaphthol proceeds.
- As the reaction solvent for example, water, methanol, ethanol, propanol, butanol, tetrahydrofuran and dioxane, or a mixed solvent thereof can be used.
- the amount of the reaction solvent used is not particularly limited and is, for example, in the range of 0 to 2000 parts by mass with respect to 100 parts by mass of the reaction raw material.
- reaction temperature is not specifically limited, According to the reactivity of the reaction raw material, it can select suitably.
- the reaction temperature is preferably in the range of 10 to 200 ° C.
- the lower the temperature, the higher the effect, and a more preferable range is 10 to 60 ° C.
- the method for producing the polyphenol compound is not particularly limited. For example, naphthols or thionaphthols, aldehydes or ketones, and a method in which an acid catalyst is collectively charged, naphthols or thionaphthols in the presence of an acid catalyst, aldehyde And a method of dropping a ketone or a ketone.
- the temperature of the reactor is increased to 130 to 230 ° C. to remove unreacted raw materials and acid catalyst existing in the system at about 1 to 50 mmHg. Volatiles can also be removed.
- the ratio of each raw material in producing the polyphenol compound is not particularly limited. For example, 2 moles to an excess amount of naphthols or thionaphthols per mole of aldehydes or ketones, and 0% of the acid catalyst. 0.001 to 1 mol may be used.
- the polycondensation reaction for obtaining the polyphenol compound proceeds by reacting each raw material at normal pressure and 20 to 60 ° C. for about 20 minutes to 100 hours.
- the target product can be isolated by a known method after the completion of the reaction.
- the isolation method of the target product is not particularly limited.
- the reaction solution is concentrated, pure water is added to precipitate a reaction product, cooled to room temperature, and then filtered to separate a solid.
- the obtained solid is filtered and dried, and then separated and purified from the by-product by column chromatography, and the target compound can also be obtained through solvent distillation, filtration and drying.
- a method for introducing an acid dissociable group into at least one phenolic hydroxyl group of the polyphenol compound is known.
- an acid dissociable group can be introduced into at least one phenolic hydroxyl group of the polyphenol compound as follows.
- the compound for introducing an acid dissociable group may be synthesized by a known method, or a commercially available product may be obtained.
- Such compounds include, for example, active carboxylic acid derivative compounds such as acid chlorides, acid anhydrides, and dicarbonates, alkyl halides, vinyl alkyl ethers, dihydropyrans, and halocarboxylic acid alkyl esters. It is not limited.
- the polyphenol compound is dissolved or suspended in an aprotic solvent such as acetone, tetrahydrofuran (THF), and propylene glycol monomethyl ether acetate.
- an aprotic solvent such as acetone, tetrahydrofuran (THF), and propylene glycol monomethyl ether acetate.
- a vinyl alkyl ether such as ethyl vinyl ether or dihydropyran is added thereto, and the reaction is carried out in the presence of an acid catalyst such as pyridinium p-toluenesulfonate at 20 to 60 ° C. for 6 to 72 hours.
- the obtained reaction solution is neutralized with an alkali compound and added to distilled water to precipitate a white solid, and then the separated white solid is washed with distilled water and dried to obtain the compound represented by the formula (1).
- the polyphenol compound is dissolved or suspended in an aprotic solvent such as acetone, THF and propylene glycol monomethyl ether acetate.
- an alkyl halide such as ethyl chloromethyl ether or a halocarboxylic acid alkyl ester such as methyl adamantyl bromoacetate was added thereto, and the reaction was performed at 20 to 110 ° C. for 6 to 72 hours in the presence of an alkali catalyst such as potassium carbonate.
- an alkali catalyst such as potassium carbonate.
- the resulting reaction solution is neutralized with an acid such as hydrochloric acid and added to distilled water to precipitate a white solid, and then the separated white solid is washed with distilled water and dried to obtain a compound represented by the formula (1) Can be obtained.
- the resist composition contains a compound represented by the following formula (2).
- each X is independently an oxygen atom or a sulfur atom
- R 1 is a single bond or a C1-30 2n valent hydrocarbon group
- the hydrocarbon group is a cyclic carbon It may have a hydrogen group (excluding an aromatic group), a double bond, a hetero atom, or a C6-30 aromatic group.
- Each R 2 independently represents a hydrogen atom, a halogen atom, a C1-10 linear, branched or cyclic alkyl group, a C6-10 aryl group, a C2-10 alkenyl group, a hydroxyl group or a hydrogen atom of a hydroxyl group; Is a group substituted with an acid dissociable group, and may be the same or different from each other in the same naphthalene ring or benzene ring, and at least one of R 2 is a hydrogen atom of a hydroxyl group being an acid dissociable group
- a structural unit of the repeating unit in the formula (2) may be the same as or different from each other, m 2 is each independently an integer of 1 to 6, and n is 1 to It is an integer of 4.
- X is preferably an oxygen atom from the viewpoint of device contamination suppression at the time of resist film exposure. From the viewpoint of solubility in a safe solvent and characteristics of the resist pattern, A compound represented by the formula (2-1) is preferable.
- R 1 , R 3 , R 4 , n and q are as defined in the above formula (1-1), and m 5 is each independently an integer of 1 to 6 , M 6 are each independently an integer of 0 to 5, and m 5 + m 6 are each independently an integer of 1 to 6.
- Each q is independently 0 or 1, but q is more preferably 1. That is, the compound represented by the above formula (2-1) is more preferably a compound represented by the following formula (2-1-a).
- R 1 , R 3 , R 4 , n, m 5 and m 6 have the same meaning as in the above formula (2-1).
- the compound represented by the above formula (2-1) is more preferably a compound represented by the following formula (2-2).
- R 1 , R 3 , R 4 , m 6 , n and q have the same meanings as in formula (2-1) above. More preferably, q is 1. That is, the compound represented by the above formula (2-2) is more preferably a compound represented by the following formula (2-2-a). In the formula (2-2-a), R 1 , R 3 , R 4 , m 6 and n are as defined in the above formula (2-2).
- m 5 in the above formula (2-1) is preferably 2.
- the compound represented by the above formula (2-1) preferably has n of 1 in the above formula (2-1).
- the compound represented by the above formula (2-1) is more preferably a compound represented by the following formula (2-3).
- R 1 , R 3 , R 4 and m 6 have the same meaning as in formula (2-1).
- the compound represented by the above formula (2) is preferably a compound represented by the following formula (4).
- X ′ is a hydrogen atom or a monovalent substituent having 1 to 18 carbon atoms
- R 0 is each independently an alkyl group having 1 to 4 carbon atoms or a halogen atom, They may be the same or different from each other in the same naphthalene ring or benzene ring
- R 4 has the same meaning as in the above formula (2-1)
- p is independently an integer of 0 to 5
- q is 0 or 1.
- the compound represented by the above formula (4) is preferably a compound represented by the following formula (4-1).
- X ′ is a hydrogen atom or a C1-18 monovalent substituent
- R 0 is each independently a C1-4 alkyl group or a halogen atom, and the same In the naphthalene ring, they may be the same or different from each other
- R 4 has the same meaning as in the above formula (4)
- p is independently an integer of 0 to 5.
- R 2 , X and m 2 have the same meaning as in the above formula (2).
- the compound represented by the above formula (2) is reacted with aldehydes or ketones corresponding to naphthols or thionaphthols in the presence of an acid catalyst.
- the resist composition of this embodiment can form an amorphous film as a resist film by spin coating.
- a positive resist pattern or a negative resist pattern can be selectively produced.
- the dissolution rate of the amorphous film formed by spin-coating the resist composition of the present embodiment with respect to the developer at 23 ° C. is preferably 5 ⁇ / sec or less, and 0.05 to 5 ⁇ / Sec is more preferable, and 0.0005 to 5 kg / sec is still more preferable.
- this dissolution rate is 5 ⁇ / sec or less, it becomes difficult to dissolve with a developer, and a resist can be more reliably formed.
- the dissolution rate when the dissolution rate is 0.0005 kg / sec or more, the resolution may be improved. This is because the contrast of the exposed portion that is dissolved in the developer and the unexposed portion that is not dissolved in the developer due to the change in solubility of the compound represented by the formula (1) or (2) before and after exposure. Presumed to be larger. Further, when the dissolution rate is 0.0005 K / sec or more, the effect of reducing line edge roughness (hereinafter referred to as “LER”) and the effect of reducing defects are further enhanced.
- the dissolution rate of the amorphous film formed by spin-coating the resist composition of the present embodiment in a developing solution at 23 ° C. is preferably 10 ⁇ / sec or more.
- the dissolution rate When the dissolution rate is 10 ⁇ / sec or more, it is easily dissolved by the developer, and is more suitable for a resist. Further, when the dissolution rate is 10 ⁇ / sec or more, the resolution may be improved. This is presumably because the micro surface portion of the compound represented by the above formula (1) or (2) is dissolved and LER is reduced. If the dissolution rate is 10 ⁇ / sec or more, the effect of reducing defects is further enhanced.
- the dissolution rate can be determined by immersing the amorphous film in a developing solution at 23 ° C. for a predetermined time, and measuring the film thickness before and after the immersion by a known method such as visual observation, an ellipsometer, or a QCM method.
- the dissolution rate with respect to is preferably 10 / sec or more.
- the dissolution rate is 10 ⁇ / sec or more, it is easily dissolved by the developer, and is more suitable for a resist.
- the dissolution rate is 10 ⁇ / sec or more, the resolution may be improved. This is presumably because the micro surface portion of the compound represented by the above formula (1) or (2) is dissolved and LER is reduced.
- the dissolution rate with respect to is preferably 5 ⁇ / sec or less, more preferably 0.05 to 5 ⁇ / sec, still more preferably 0.0005 to 5 ⁇ / sec.
- this dissolution rate is 5 ⁇ / sec or less, it becomes difficult to dissolve with a developer, and a resist can be more reliably formed.
- the dissolution rate when the dissolution rate is 0.0005 kg / sec or more, the resolution may be improved. This is because the contrast of the unexposed portion that is dissolved in the developer and the exposed portion that is not dissolved in the developer is caused by the change in solubility of the compound represented by the formula (1) or (2) before and after exposure. Presumed to be larger.
- the dissolution rate is 0.0005 K / sec or more, the LER reduction effect and the defect reduction effect are further enhanced.
- the resist composition of the present embodiment contains the compound represented by the above formula (1) or the compound represented by the above formula (2) as a solid component.
- the resist composition of this Embodiment may contain both the compound represented by the said Formula (1), and the compound represented by the said Formula (2).
- the resist composition of the present embodiment preferably further contains a solvent in addition to the compound represented by the above formula (1) or (2).
- the solvent used in the present embodiment is not particularly limited, and examples thereof include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono-n-propyl ether acetate, and ethylene glycol mono-n-butyl ether acetate.
- Ethylene glycol monoalkyl ether acetates 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 (PGMEA), propylene glycol mono-n-propyl Ether acetate and propylene glycol mono-n-butyl ether Propylene glycol monoalkyl ether acetates such as cetate; propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether (PGME) and propylene glycol monoethyl ether; methyl lactate, ethyl lactate, n-propyl lactate, n-butyl lactate and lactic acid Lactic acid esters such as n-amyl; aliphatic carboxylic acid esters such as methyl acetate, ethyl acetate, n-
- the solvent used in the present embodiment is preferably a safe solvent, more preferably selected from the group consisting of PGMEA, PGME, CHN, CPN, 2-heptanone, anisole, butyl acetate, ethyl propionate and ethyl lactate. At least one selected from the group consisting of PGMEA, PGME and CHN.
- the content of the solid component and the content of the solvent in the resist composition are not particularly limited, but the content of the solid component is 1 to 80% by mass and the solvent is 100% by mass with respect to the total content of the solid component and the solvent.
- the content of is preferably 20 to 99% by mass, more preferably the solid component content is 1 to 50% by mass, the solvent content is 50 to 99% by mass, and still more preferably the solid component content is Is 2 to 40% by mass, and the solvent content is 60 to 98% by mass, particularly preferably the solid component content is 2 to 10% by mass and the solvent content is 90 to 98% by mass.
- the resist composition of the present embodiment may contain at least one selected from the group consisting of an acid generator, an acid diffusion controller, and other solid components as solid components other than those described above.
- the total mass (The compound represented by Formula (1), Formula (2) of a solid component
- the total of solid components optionally used such as a compound represented by the formula, an acid generator, an acid diffusion controller and other solid components, the same shall apply hereinafter) is preferably 50 to 99.4% by mass, More preferably, it is 55 to 90% by mass, still more preferably 60 to 80% by mass, and particularly preferably 60 to 70% by mass.
- the resist composition contains both the compound represented by the above formula (1) and the compound represented by the above formula (2), the compound represented by the above formula (1) or (2)
- the content is the total content of the compound represented by the above formula (1) and the compound represented by the above formula (2).
- the resist composition of the present embodiment is directly or indirectly oxidized 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 contain one or more acid generators that generate water.
- the content of the acid generator in the resist composition is preferably 0.001 to 49% by mass, more preferably 1 to 40% by mass, and still more preferably 3 to 30% by mass with respect to the total mass of the solid component. 10 to 25% by mass is particularly preferable.
- the acid generation method is not limited as long as an acid is generated in the system.
- each R 13 is independently a hydrogen atom, a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group, a hydroxyl group or a halogen atom
- X ⁇ represents a sulfonate ion or a halide ion having an alkyl group, an aryl group, a halogen-substituted alkyl group, or a halogen-substituted aryl group.
- the compound represented by the above formula (8-1) is triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium nonafluoro-n-butanesulfonate, diphenyltolylsulfonium nonafluoro-n-butanesulfonate, triphenylsulfonium perfluoro-n.
- each R 14 independently represents a hydrogen atom, a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group, a hydroxyl group, or a halogen atom.
- X ⁇ has the same meaning as in formula (8-1) above.
- the compounds represented by the above formula (8-2) are 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) iodoniumbenzenesulfonate, bis (4-t-butylphenyl) ) Iodonium-2-trifluoromethylbenzenesulfonate, bis (4-tert-butylphenyl) iodonium-4-trifluoromethylbenzenesulfonate, bis (4-tert-butylphenyl) iodonium-2,4
- Q is an alkylene group, an arylene group or an alkoxylene group
- R 15 is an alkyl group, an aryl group, a halogen-substituted alkyl group or a halogen-substituted aryl group.
- the compound represented by the formula (8-3) includes N- (trifluoromethylsulfonyloxy) succinimide, N- (trifluoromethylsulfonyloxy) phthalimide, N- (trifluoromethylsulfonyloxy) diphenylmaleimide, 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-dicarboximide, N (10-camphorsulfonyloxy) naph
- each R 16 independently represents an optionally substituted linear, branched or cyclic alkyl group, an optionally substituted aryl group, an optionally substituted heteroaryl group or An optionally substituted aralkyl group.
- the compound represented by the above formula (8-4) is diphenyl disulfone, di (4-methylphenyl) disulfone, dinaphthyl disulfone, di (4-tert-butylphenyl) disulfone, di (4-hydroxyphenyl). At least one selected from the group consisting of disulfone, di (3-hydroxynaphthyl) disulfone, di (4-fluorophenyl) disulfone, di (2-fluorophenyl) disulfone and di (4-trifluoromethylphenyl) disulfone It is preferable.
- 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, and optionally substituted. Heteroaryl groups or optionally substituted aralkyl groups. )
- the compounds represented by the above formula (8-5) are ⁇ - (methylsulfonyloxyimino) -phenylacetonitrile, ⁇ - (methylsulfonyloxyimino) -4-methoxyphenylacetonitrile, ⁇ - (trifluoromethylsulfonyloxyimino).
- each R 18 independently represents a halogenated alkyl group having one or more chlorine atoms or one or more bromine atoms.
- the halogenated alkyl group preferably has 1 to 5 carbon atoms.
- R 19 and R 20 are each independently a C1-3 alkyl group such as a methyl group, an ethyl group, an n-propyl group and an isopropyl group; a cyclopentyl group And a cycloalkyl group such as cyclohexyl group; a C1-3 alkoxyl group such as methoxy group, ethoxy group and propoxy group; or an aryl group such as phenyl group, toluyl group and naphthyl group, preferably C6-10 An aryl group.
- L 19 and L 20 are each independently an organic group having a 1,2-naphthoquinonediazide group.
- organic group having a 1,2-naphthoquinonediazide group examples include a 1,2-naphthoquinonediazide-4-sulfonyl group, a 1,2-naphthoquinonediazide-5-sulfonyl group, and a 1,2-naphthoquinonediazide- Preferred examples include 1,2-quinonediazidosulfonyl groups such as a 6-sulfonyl group. Of these, 1,2-naphthoquinonediazide-4-sulfonyl group and 1,2-naphthoquinonediazide-5-sulfonyl group are particularly preferable.
- J 19 is a single bond, a polymethylene group of C1 ⁇ 4, a cycloalkylene group, a phenylene group, a group represented by the following formula (8-7-1), a carbonyl group, an ester group, an amide group or an ether group, Y 19 Each independently represents a hydrogen atom, an alkyl group (preferably a C1-C3 alkyl group) or an aryl group (preferably a C6-C10 aryl group), and X 20 each independently represents a group represented by the following formula (8 A group represented by -8-1).
- each Z 22 independently represents an alkyl group (preferably a C1-C3 alkyl group), a cycloalkyl group (preferably a C3-C6 cycloalkyl group) or an aryl group ( preferably an aryl group) of C6 ⁇ C10
- R 22 are each independently an alkyl group of an alkyl group (preferably C1 ⁇ C3), cycloalkyl groups of a cycloalkyl group (preferably C3 ⁇ C6) or alkoxylated A group (preferably a C1-C3 alkoxy group), and r is an integer of 0-3.
- Examples of other acid generators include 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 (cyclohexylsulfonylazomethylsulfonyl) propane, 1,4-bis (phenylsulfonylazomethylsulfonyl) butane, 1,6-
- acid generators having an aromatic ring are preferable, and acid generators represented by the above formula (8-1) or (8-2) are more preferable.
- An acid generator having a sulfonate ion having an aryl group or a halogen-substituted aryl group as X ⁇ in the formula (8-1) or (8-2) is more preferred, and an acid generator having a sulfonate ion having an aryl group
- Particularly preferred are diphenyltrimethylphenylsulfonium p-toluenesulfonate, triphenylsulfonium p-toluenesulfonate, triphenylsulfonium trifluoromethanesulfonate, and triphenylsulfonium nonafluoromethanesulfonate.
- LER can be further reduced.
- the said acid generator is used individually by 1 type or in combination of 2 or more types.
- the resist composition of the present embodiment controls acid diffusion in the resist film by controlling the diffusion of the acid generated from the acid generator by irradiation to prevent undesirable chemical reactions in the unexposed areas.
- An agent may be contained.
- the storage stability of the resist composition is improved.
- the resolution is further improved, and the change in the line width of the resist pattern due to fluctuations in the holding time before radiation irradiation and the holding time after radiation irradiation can be suppressed, thereby stabilizing the process. It is extremely excellent in properties.
- Such an acid diffusion control agent is not particularly limited, and examples thereof include radiation-decomposable basic compounds such as a nitrogen atom-containing basic compound, a basic sulfonium compound, and a basic iodonium compound.
- the acid diffusion controller can be used alone or in combination of two or more.
- Examples of the acid diffusion controller include nitrogen-containing organic compounds and basic compounds that decompose upon exposure.
- Examples of the nitrogen-containing organic compound include the following formula (11):
- nitrogen-containing compound (I) a diamino compound having two nitrogen atoms in the same molecule
- nitrogen-containing compound (II) a diamino compound having two nitrogen atoms in the same molecule
- nitrogen-containing compound (III) polyamino compounds and polymers having 3 or more nitrogen atoms
- an acid diffusion control agent may be used individually by 1 type, and may use 2 or more types together.
- 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 and aralkyl group may be unsubstituted or substituted with a hydroxyl group or the like.
- the linear, branched or cyclic alkyl group is not particularly limited, and examples thereof include C1-15, preferably C1-10, and specifically include a methyl group, an ethyl group, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, neopentyl, n-hexyl, texyl, n-heptyl, n- Examples include octyl group, n-ethylhexyl group, n-nonyl group and n-decyl group.
- aryl group examples include those having 6 to 12 carbon atoms, and specific examples include a phenyl group, a tolyl group, a xylyl group, a cumenyl group, and a 1-naphthyl group.
- the aralkyl group is not particularly limited, and examples thereof include C7-19, preferably C7-13. Specifically, a benzyl group, an ⁇ -methylbenzyl group, a phenethyl group, and a naphthylmethyl group are included. Can be mentioned.
- the nitrogen-containing compound (I) is not particularly limited, and specifically includes, for example, n-hexylamine, n-heptylamine, n-octylamine, n-nonylamine, n-decylamine, n-dodecylamine and 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 and dicyclohexylamine; triethylamine, tri-n-propylamine, tri-n- Butylamine, tri-n-pentylamine, tri-n-hexylamine, tri-n Tri (cyclo) such as heptylamine, tri-n-octylamine, tri-n-nonylamine, tri-n-decylamine, dimethyl-n-dodecylamine, di-n-d
- the nitrogen-containing compound (II) is not particularly limited. Specifically, for example, 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, 2,2-bis (4-aminophenyl) propane 2- (3-aminophenyl) -2- (4-aminophenyl) propane, 1,4-bis [1- (4-aminophenyl) -1-methylethyl] benzene, 1,3-bis [1- And (4-aminophenyl) -1-methylethyl] benzene.
- the nitrogen-containing compound (III) is not particularly limited, and specific examples include a polymer of polyethyleneimine, polyallylamine and N- (2-dimethylaminoethyl) acrylamide.
- the amide group-containing compound is not particularly limited. Specifically, for example, formamide, N-methylformamide, N, N-dimethylformamide, acetamide, N-methylacetamide, N, N-dimethylacetamide, propionamide, Benzamide, pyrrolidone and N-methylpyrrolidone.
- the urea compound is not particularly limited. Specifically, for example, urea, methylurea, 1,1-dimethylurea, 1,3-dimethylurea, 1,1,3,3-tetramethylurea, 1,3 -Diphenylurea and tri-n-butylthiourea.
- the nitrogen-containing heterocyclic compound is not particularly limited. Specifically, for example, 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, In addition to pyridines such as quinoline, 8-oxyquinoline and acridine, pyrazine, pyrazole, pyridazine, quinosaline, purine, pyrrolidine, piperidine, morpholine, 4-methylmorpholine, piperazine, 1,4-dimethylpiperazine and 1,4-diazabicyclo [2. .2] octane.
- imidazoles such
- the radiolytic basic compound is not particularly limited, and for example, the following formula (12-1): And a sulfonium compound represented by the following formula (12-2):
- R 71 , R 72 , R 73 , R 74 and R 75 are each independently a hydrogen atom, a C1-6 alkyl group, or a C1-6 An alkoxyl group, a hydroxyl group or a halogen atom is shown.
- Z ⁇ represents HO ⁇ , R—COO ⁇ (wherein R represents a C1-6 alkyl group, a C6-11 aryl group, or a C7-12 alkaryl group) or the following formula (12-3):
- radiolytic basic compound examples include, for example, triphenylsulfonium hydroxide, triphenylsulfonium acetate, triphenylsulfonium salicylate, diphenyl-4-hydroxyphenylsulfonium hydroxide, diphenyl-4-hydroxyphenyl.
- the content of the acid diffusion controller in the resist composition is preferably 0.001 to 49% by mass, more preferably 0.01 to 10% by mass, and 0.01 to 5% by mass with respect to the total mass of the solid component. More preferred is 0.01 to 3% by mass.
- the resist composition contains the acid diffusion control agent within the above range, it is possible to further suppress deterioration in resolution, pattern shape, dimensional fidelity, and the like. Furthermore, when the content is within the above range, deterioration of the shape of the upper layer portion of the pattern can be suppressed even if the holding time from the electron beam irradiation to the post-irradiation heating becomes longer. Moreover, the fall of a sensitivity, the developability of an unexposed part, etc.
- the storage stability of the resist composition is improved, the resolution is improved, and the resist is caused by fluctuations in the holding time before irradiation and the holding time after irradiation.
- the change in the line width of the pattern can be suppressed, and the process stability is extremely excellent.
- a dissolution accelerator such as organic carboxylic acids or phosphorus oxo acids or derivatives thereof can be added alone or in combination.
- the dissolution accelerator increases the solubility of the compound represented by the formula (1) or (2) in the developing solution and increases the dissolution rate of the compound appropriately during development. It is a component having A dissolution promoter can be used in the range which does not impair the effect of this invention.
- the dissolution accelerator include low molecular weight phenolic compounds, and examples thereof include bisphenols and tris (hydroxyphenyl) methane. These dissolution promoters can be used singly or in combination of two or more.
- the resist composition contains a dissolution accelerator, the content is appropriately adjusted according to the type of the compound represented by the formula (1) or (2) to be used, but with respect to the total mass of the solid component.
- More than 0 mass% and 49 mass% or less are preferable, more than 0 mass% and 5 mass% or less are more preferable, and more than 0 mass% and 1 mass% or less are still more preferable. However, it is particularly preferable not to use a dissolution accelerator from the viewpoint of not reducing the effect of the present invention.
- dissolution control agent When the solubility of the compound represented by the formula (1) or (2) in the developer is high, the dissolution control agent controls the solubility and moderately decreases the dissolution rate of the compound during development. It is a component having an action. As such a dissolution control agent, those that do not chemically change in steps such as baking of the resist film, irradiation with radiation, and development are preferable.
- the dissolution control agent is not particularly limited, and examples thereof include aromatic hydrocarbons such as phenanthrene, anthracene, and acenaphthene; ketones such as acetophenone, benzophenone, and phenyl naphthyl ketone; methyl phenyl sulfone, diphenyl sulfone, and dinaphthyl sulfone. Examples include sulfones. These dissolution control agents can be used alone or in combination of two or more.
- the content when the resist composition contains a dissolution control agent is not particularly limited and is appropriately adjusted according to the type of the compound represented by the formula (1) or (2) to be used.
- More than 0 mass% and 49 mass% or less are preferable with respect to the total mass, more than 0 mass% and 5 mass% or less are more preferable, and more than 0 mass% and 1 mass% or less are still more preferable. However, from the viewpoint of not reducing the effect of the present invention, it is particularly preferable not to use a dissolution control agent.
- the 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 improving the apparent sensitivity of the resist. It is a component to be made.
- a sensitizer is not particularly limited, and examples thereof include benzophenones, biacetyls, pyrenes, phenothiazines, and fluorenes. These sensitizers can be used individually by 1 type or in mixture of 2 or more types.
- the resist composition contains a sensitizer, the content is appropriately adjusted according to the type of the compound represented by the formula (1) or (2) to be used, but with respect to the total mass of the solid component.
- More than 0 mass% and 49 mass% or less are preferable, more than 0 mass% and 5 mass% or less are more preferable, and more than 0 mass% and 1 mass% or less are still more preferable. However, it is particularly preferable not to use a sensitizer from the viewpoint of not reducing the effect of the present invention.
- the surfactant is a component having an action of improving the coating property and striation of the resist composition of the present embodiment, the developing property 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 has a higher effect as a surfactant.
- nonionic surfactants include polyoxyethylene higher alkyl ethers, polyoxyethylene higher alkyl phenyl ethers, and higher fatty acid diesters of polyethylene glycol, but are not particularly limited.
- More than 0 mass% and 49 mass% or less are preferable with respect to the total mass, more than 0 mass% and 5 mass% or less are more preferable, and more than 0 mass% and 1 mass% or less are still more preferable. However, from the viewpoint of not reducing the effect of the present invention, it is particularly preferable not to use a surfactant.
- the resist composition of the present embodiment further contains, as an optional component, an organic carboxylic acid or an oxo acid of phosphorus or a derivative thereof for the purpose of preventing sensitivity deterioration or improving the resist pattern shape, retention stability, and the like. Also good. These components can be used in combination with an acid diffusion controller, or may be used alone.
- organic carboxylic acid for example, malonic acid, citric acid, malic acid, succinic acid, benzoic acid and salicylic acid are suitable.
- Phosphorus oxoacids or derivatives thereof include phosphoric acid, phosphoric acid di-n-butyl ester and phosphoric acid diphenyl ester, and derivatives such as phosphoric acid, phosphonic acid dimethyl ester, phosphonic acid di- Derivatives such as n-butyl ester, phenylphosphonic acid, phosphonic acid diphenyl ester and phosphonic acid dibenzyl ester, phosphonic acids or their esters; phosphinic acids such as phosphinic acid and phenylphosphinic acid and their derivatives It is done. Of these, phosphonic acid is particularly preferred.
- the organic carboxylic acid or phosphorus oxo acid or derivative thereof is used alone or in combination of two or more.
- the content thereof is appropriately adjusted according to the type of the compound represented by the formula (1) or (2) used. More than 0 mass% and 49 mass% or less are preferable with respect to the total mass of a solid component, more than 0 mass% and 5 mass% or less are more preferable, and more than 0 mass% and 1 mass% or less are still more preferable.
- One or more other additives other than the derivative can be contained.
- additives include dyes, pigments, and adhesion aids.
- the resist composition contains 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.
- the resist composition contains an 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, and specifically 4-hydroxy-4′-methylchalcone.
- the total content of other additives is preferably more than 0% by mass and 49% by mass or less, more preferably more than 0% by mass and 5% by mass or less, and further more than 0% by mass and 1% by mass or less based on the total mass of the solid component. preferable. However, it is particularly preferable not to use other additives from the viewpoint of not reducing the effect of the present invention.
- the compound represented by formula (1) and / or the compound represented by formula (2), the acid generator, the acid diffusion controller, and other solid components The content ratio (the compound represented by the formula (1) and / or the compound represented by the formula (2) / acid generator / acid diffusion controller / other solid component) is expressed in mass% (resist composition) based on the solid matter.
- the total amount of solids in the product is 100%), preferably 50 to 99.4 / 0.001 to 49 / 0.001 to 49/0 to 49, more preferably 55 to 90/1 to 40/0.
- the content ratio of each component is selected from each range so that the sum is 100% by mass. When the content ratio is in the above range, performance such as sensitivity, resolution, developability and the like is further improved.
- the method for preparing the resist composition of the present embodiment is not particularly limited.
- each component is dissolved / dispersed in a solvent to form a uniform solution at the time of use, and then, for example, if necessary, the pore diameter is about 0.2 ⁇ m.
- the method etc. which filter with a filter etc. are mentioned.
- Examples of the solvent used for preparing the resist composition of the present embodiment include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono-n-propyl ether acetate, and ethylene glycol mono-n-butyl ether.
- Ethylene glycol monoalkyl ether acetates such as 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 and propylene glycol mono-n-butyl ether acetate Propylene glycol monoalkyl ether acetates such as propylene glycol; propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether and propylene glycol monoethyl ether; methyl lactate, ethyl lactate, n-propyl lactate, n-butyl lactate and n-lactate Lactic acid esters such as amyl; aliphatic carboxylic acid esters such as methyl acetate, ethyl acetate,
- the resist composition of the present embodiment can contain one or more resins as long as the object of the present invention is not impaired.
- the resin is not particularly limited, and examples thereof include novolak resins, polyvinylphenols, polyacrylic acid, polyvinyl alcohol, styrene-maleic anhydride resins, and polymers containing acrylic acid, vinyl alcohol, or vinyl phenol as monomer units, Or these derivatives are mentioned.
- the content of the resin in the resist composition is not particularly limited and is appropriately adjusted according to the type of the compound represented by the formula (1) or (2) to be used, but is 30 masses per 100 mass parts of the compound.
- the amount is preferably 10 parts by mass or less, more preferably 5 parts by mass or less. However, it is particularly preferable not to use a resin from the viewpoint of not reducing the effects of the present invention.
- the method for forming a resist pattern according to the present embodiment is not particularly limited, and as a suitable method, a step of forming a resist film by applying the above-described resist composition of the present embodiment on a substrate is formed. Examples thereof include a method including a step of exposing a resist film and a step of developing the exposed resist film to form a resist pattern.
- the resist pattern of this embodiment can also be formed as an upper layer resist in a multilayer process.
- a resist film is formed by applying the resist composition of the present embodiment on a conventionally known substrate by a coating means such as spin coating, casting coating or roll coating.
- substrate is not specifically limited, For example, the board
- inorganic film examples include an inorganic antireflection film (inorganic BARC).
- organic film examples include an organic antireflection film (organic BARC). You may use what performed the surface treatment by the hexamethylene disilazane etc. with respect to the said board
- the substrate coated with the resist composition is heated as necessary.
- the heating conditions may be appropriately changed depending on the composition of the resist composition, but is preferably 20 to 250 ° C., more preferably 20 to 150 ° C. Heating is preferable because the adhesion of the resist film 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. What is necessary is just to select exposure conditions etc. suitably according to the composition etc. of a resist composition.
- heating is preferably performed after radiation irradiation in order to stably form a high-precision fine pattern in exposure.
- the heating conditions may be changed depending on the composition of the resist composition, but is preferably 20 to 250 ° C., more preferably 20 to 150 ° C.
- the exposed resist film is developed with a developer to form a predetermined resist pattern.
- the developer preferably contains a solvent having a solubility parameter (SP value) close to that of the compound represented by formula (1) or (2) used.
- SP value solubility parameter
- examples of the solvent contained in the developer include polar solvents such as ketone solvents, ester solvents, alcohol solvents, amide solvents, and ether solvents, organic solvents such as hydrocarbon solvents, and alkaline aqueous solutions. .
- polar solvents such as ketone solvents, ester solvents, alcohol solvents, amide solvents, and ether solvents
- organic solvents such as hydrocarbon solvents
- alkaline aqueous solutions such as hydrocarbon solvents
- a polar solvent such as a ketone solvent, an ester solvent, an alcohol solvent, an amide solvent, and an ether solvent, and a hydrocarbon solvent
- a positive resist pattern can be obtained.
- the ketone solvent is not particularly limited, and examples thereof include 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, acetone, 4-heptanone, 1-hexanone, 2-hexanone, diisobutyl ketone, cyclohexanone, and methylcyclohexanone.
- the ester solvent is not particularly limited.
- the alcohol solvent is not particularly limited, and examples thereof include 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 and n-decanol; glycol solvents such as ethylene glycol, diethylene glycol and triethylene glycol; ethylene glycol monomethyl ether; Propylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, diethylene glycol monomethyl ether Le, and a glycol ether-based solvents such as triethylene glycol monoethyl ether and methoxymethyl butanol.
- the ether solvent is not particularly limited, and examples thereof include dioxane and tetrahydrofuran in addition to the glycol ether solvent.
- the amide solvent is not particularly limited, and examples thereof include N-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, hexamethylphosphoric triamide and 1,3-dimethyl-2- Examples include imidazolidinone.
- the hydrocarbon solvent is not particularly limited, and examples thereof include aromatic hydrocarbon solvents such as toluene and xylene; and aliphatic hydrocarbon solvents such as pentane, hexane, octane and decane.
- the above organic solvents are used singly or in combination of two or more. Moreover, you may use 1 type (s) or 2 or more types of said organic solvent in combination with a solvent other than the above and / or water within the range which does not inhibit the performance as a solvent.
- the water content of the developer as a whole is preferably less than 70% by mass, more preferably less than 50% by mass, and less than 30% by mass. It is more preferable that it is less than 10% by mass, and it is very preferable that it does not substantially contain water.
- the content of the organic solvent in the developer is not particularly limited, but is preferably 30% by mass or more and 100% by mass or less, and more preferably 50% by mass or more and 100% by mass or less with respect to the total amount of the developer. More preferably, it is more preferably 70% by mass or more and 100% by mass or less, still more preferably 90% by mass or more and 100% by mass or less, and particularly preferably 95% by mass or more and 100% by mass or less. preferable.
- the alkaline aqueous solution is not particularly limited, and examples thereof include mono-, di- or trialkylamines, mono-, di- or trialkanolamines, heterocyclic amines, tetramethylammonium hydroxide (TMAH), and Examples include aqueous solutions of alkaline compounds such as choline.
- TMAH tetramethylammonium hydroxide
- the developer is a developer containing at least one solvent selected from the group consisting of ketone solvents, ester solvents, alcohol solvents, amide solvents, and ether solvents. This is preferable because it improves resist performance such as roughness.
- 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.
- a solvent having such a vapor pressure may be contained in the developer.
- the solvent having a vapor pressure of 5 kPa or less Ketone solvents such as 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, 4-heptanone, 2-hexanone, diisobutylketone, cyclohexanone, methylcyclohexanone, phenylacetone and 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 Ester solvents such as 3-methyl
- the solvent having a vapor pressure of 2 kPa or less which is a more preferable range, include 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, 4-heptanone, 2-hexanone, diisobutyl ketone, cyclohexanone, Ketone solvents such as methylcyclohexanone and 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-3-ethoxypropionate, Ester solvents such as 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, ethyl lactate, butyl lactate and propyl lactate; n-butyl Alcohol solvents such as alcohol
- Glycol ether solvents N-methyl-2-pyrrolidone, N, N-dimethylacetamide Fine N, N- dimethylformamide amide-based solvents, aromatic hydrocarbon solvents such as xylene; and include aliphatic hydrocarbon solvents such as octane and decane.
- a surfactant can be added to the developer as necessary.
- a surfactant is not particularly limited, and examples thereof include ionic and nonionic fluorine-based and / or silicon-based surfactants.
- fluorine and / or silicon surfactants include, for example, JP-A-62-36663, JP-A-61-226746, JP-A-61-226745, JP-A-62-170950.
- JP-A-5360692 JP-A-5529881, JP-A-5296330, JP-A-53466098, JP-A-5576143, JP-A-5294511, and JP-A-5824451
- it is a nonionic surfactant.
- a fluorochemical surfactant or a silicon-type surfactant it is more preferable to use.
- the addition amount of the surfactant to the developer is usually preferably 0.001 to 5% by mass, more preferably 0.005 to 2% by mass, and still more preferably 0.01 to 0% with respect to the total amount of the developer. 0.5% by mass.
- a development method for example, a method in which a substrate is immersed in a tank filled with a developer for a certain period of time (dip method), a method in which the developer is raised on the surface of the substrate by surface tension and is left stationary for a certain time (paddle) Method), a method of spraying a developer on the substrate surface (spray method), a method of continuously applying a developer while scanning a developer application nozzle at a constant speed on a substrate rotating at a constant speed (dynamic dispensing method) ).
- the development time is not particularly limited, but is preferably 10 seconds to 90 seconds.
- the present embodiment may have a step of stopping development while replacing the developer with another solvent after the step of developing.
- this embodiment includes a step of cleaning the substrate and the resist pattern formed thereon using a rinse liquid containing an organic solvent (hereinafter, also referred to as “rinse step”) after the developing step. It is preferable.
- the rinsing liquid used in the rinsing step after development is not particularly limited as long as it does not dissolve the resist pattern cured by crosslinking, and a solution or water containing a general organic solvent can be used.
- the rinse liquid include a rinse liquid containing at least one organic solvent selected from the group consisting of hydrocarbon solvents, ketone solvents, ester solvents, alcohol solvents, amide solvents, and ether solvents. It is preferable to use it. More preferably, the rinsing liquid used in the rinsing step contains at least one organic solvent selected from the group consisting of ketone solvents, ester solvents, alcohol solvents, and amide solvents.
- the rinsing liquid used in the rinsing step contains an alcohol solvent and / or an ester solvent. Even more preferably, the rinsing liquid used in the rinsing step contains a monohydric alcohol. Particularly preferably, the rinsing solution used in the rinsing step contains a C5 or higher monohydric alcohol.
- the time required for the rinsing step is not particularly limited, but is preferably 10 seconds to 90 seconds.
- examples of the monohydric alcohol used in the rinsing step after development include linear, branched, or cyclic monohydric alcohols.
- Specific examples include 1-butanol, 2-butanol, 3-methyl alcohol.
- -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 and 4-octanol.
- Particularly preferred C5 or higher monohydric alcohols include 1-hexanol, 2-hexanol, 4-methyl-2-pentanol, 1-pentanol and 3-methyl-1-butanol.
- the rinsing liquid may contain one or more of the above components, or may further contain an organic solvent other than the above.
- the moisture content in the rinse liquid is not particularly limited, but is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably 3% by mass or less. By setting the water content to 10% by mass or less, better development characteristics can be obtained.
- the vapor pressure of the rinse liquid used after development is preferably 0.05 kPa or more and 5 kPa or less, more preferably 0.1 kPa or more and 5 kPa or less, and further preferably 0.12 kPa or more and 3 kPa or less at 20 ° C.
- the rinse liquid may contain an appropriate amount of a surfactant.
- the developed substrate is cleaned using a rinsing solution containing the organic solvent.
- the cleaning method is not particularly limited.
- a method of continuously applying a rinsing liquid onto a substrate rotating at a constant speed or immersing the substrate in a bath filled with the rinsing liquid for a certain period of time.
- Examples thereof include a method (dip method) and a method (spray method) in which a rinse liquid is sprayed onto the substrate surface.
- the spin coating method is preferable, and after washing by the spin coating method, the substrate is preferably rotated at a rotational speed of 2000 rpm to 4000 rpm to remove the rinse liquid from the substrate.
- the pattern wiring board is obtained by etching.
- etching method a known method such as dry etching using a plasma gas and wet etching using an alkali solution, a cupric chloride solution, a ferric chloride solution, or the like can be employed.
- plating can also be performed.
- the plating method include 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 PGMEA (propylene glycol monomethyl ether acetate), PGME (propylene glycol monomethyl ether), and EL (ethyl lactate).
- peeling method include 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 forming a resist pattern, depositing a metal in vacuum, and then dissolving the resist pattern with a solution, that is, a lift-off method.
- the polyphenol derivative of the present embodiment is a compound represented by the following formula (3) or a polyphenol derivative represented by the following formula (4).
- X ′ is each independently a hydrogen atom or a monovalent substituent having 1 to 18 carbon atoms
- R 0 is each independently having 1 to 4 carbon atoms.
- R 4 has the same meaning as in formula (1-1)
- p is independently And is an integer of 0 to 5, and q is 0 or 1.
- the compound represented by the above formula (3) and the polyphenol derivative represented by the above formula (4) are respectively represented by the compound represented by the following formula (3-1) and the following formula (4-1). It is preferable that it is a compound.
- X ′ is each independently a hydrogen atom or a monovalent substituent of C1-18
- R 0 is independently C1-4
- R 4 has the same meaning as in formula (1-1)
- p is independently 0 An integer of ⁇ 5.
- the polyphenol derivative of the present embodiment has a naphthalene skeleton, it has excellent heat resistance and, in addition, has an effect of being excellent in solubility in a safe solvent.
- the position of —OR 4 in the naphthalene ring is not particularly limited, but from the viewpoint of industrial applicability of raw materials, the 1,5-position, 1,6-position, 1,7-position, 2,3-position, 2,7-position, or The 2nd and 6th positions are preferable, and the 2nd and 6th positions are more preferable from the viewpoint of higher solubility in a safe solvent and lower crystallinity.
- Pattern evaluation of resist pattern (resolution, shape, LER) Whether line and space is observed with a scanning electron microscope (S-4800 (product name) manufactured by Hitachi High-Technology Co., Ltd.) and whether the pattern shape, line edge roughness, and sensitivity are good for a pattern with a resolution of 30 nm Evaluation was performed. If the pattern shape was rectangular, it was judged to be good.
- LER Line Edge Roughness
- SEM scanning electron microscope
- the liquid after the reaction was concentrated, 50 g of pure water was added to precipitate the reaction product, cooled to room temperature, and then separated by filtration.
- the obtained solid was further filtered and dried, followed by separation and purification by column chromatography to obtain 0.2 g of the target compound (BisN-1) represented by the following formula.
- the target compound (BisN-1) represented by the following formula.
- Example 1 the solubility to a safe solvent was evaluated by the said method.
- the results are shown in Example 1 in Table 1.
- TetP-1 and di-t-butyldicarbonate were reacted in the same manner as in Synthesis Example 1 except that TetP-1 was used in place of BisN-1, and the target compound represented by the following formula: 2.50 g of (TetP-1-BOC) was obtained.
- NMR measurement was performed on the said measurement conditions, and it confirmed that it had a chemical structure of a following formula.
- resorcinol 22 g, 0.2 mol
- Kanto Chemical Co., Ltd. was placed in a four-necked flask (1000 mL) equipped with a well-dried dropping funnel substituted with nitrogen, Jim Roth condenser, thermometer and stirring blade.
- CHBAL 6. g, 0.2 mol
- dehydrated ethanol 200 mL
- This solution was heated to 85 ° C. with a mantle heater while stirring.
- 75 mL of concentrated hydrochloric acid 35%) was added dropwise over 30 minutes using a dropping funnel, and then the reaction was allowed to proceed with stirring at 85 ° C. for 3 hours.
- the resist pattern was formed in the following procedures using the obtained resist composition.
- PB pre-exposure heating
- the obtained resist film was set to an electron beam using an electron beam lithography apparatus (product name “ELS-7500”, manufactured by Elionix Co., Ltd.) with a line and space of 1: 1 at intervals of 50 nm, 40 nm and 30 nm.
- ELS-7500 electron beam lithography apparatus
- each was heated at a predetermined temperature for 90 seconds, and developed by being immersed in a TMAH 2.38 mass% alkali developer for 60 seconds. Thereafter, rinsing with ultrapure water and drying were performed to form a positive resist pattern.
- pattern evaluation was implemented by the said method. The obtained results are shown in Table 1.
- the developer is changed from TMAH 2.38% by mass alkaline developer to butyl acetate, the development time is changed until the pattern can be developed, and the rinse is not washed. Similarly, a negative resist pattern was formed. About the obtained resist pattern, pattern evaluation was implemented by the said method. The obtained results are shown in Table 1.
- the resist composition containing the compound according to the present invention can form a resist pattern with high sensitivity, low roughness, and good shape as compared with the composition containing TetP-1 or CR-1. I understood that I could do it. As long as the above-described requirements of the present invention are satisfied, compounds other than those described in the examples also show the same effect.
- the present invention it is possible to provide a resist composition that is excellent in heat resistance, has high solubility in a safe solvent, has high sensitivity, and can impart a good resist pattern shape, and a resist pattern forming method using the same. Therefore, the present invention is useful in the semiconductor field, display field, photomask, thin film magnetic head, compound semiconductor, research and development, etc. in which a resist composition such as an acid amplification type non-polymer resist material is used. Further, according to the present invention, a polyphenol derivative having excellent heat resistance and high solubility in a safe solvent can be provided.
- the present invention provides a raw material and a curing agent for epoxy resin used for a base material of a photosensitive material such as a photoresist for semiconductor, a sealing material for an integrated circuit, and a developer and an anti-fading agent used for a heat-sensitive recording material.
- a photosensitive material such as a photoresist for semiconductor
- a sealing material for an integrated circuit such as a sealing material for an integrated circuit
- a developer and an anti-fading agent used for a heat-sensitive recording material.
- additives such as bactericides and fungicides.
Abstract
Description
また、本発明は、上記レジスト組成物等に使用できるポリフェノール誘導体に関する。
また、非特許文献2には溶解性について記載がなく、記載された化合物の耐熱性はいまだ十分ではなく、耐熱性、耐水性、耐薬品性、電気特性及び機械特性等の諸特性の一段の向上が求められている。
本発明の目的は、耐熱性に優れ、安全溶媒に対する溶解性が高く、高感度で、かつ良好なレジストパターン形状を付与できるレジスト組成物、及び該レジスト組成物を用いるレジストパターン形成方法を提供することにある。
また、本発明の別の目的は、耐熱性に優れ、安全溶媒に対する溶解性の高いポリフェノール誘導体を提供することにある。
[1]下記式(1)又は(2)で表される化合物を含有するレジスト組成物。
[2]前記式(1)で表される化合物が下記式(1-1)で表される化合物であり、前記式(2)で表される化合物が式(2-1)で表される化合物である、上記[1]に記載のレジスト組成物。
[3]前記式(1)で表される化合物が下記式(1-2)で表される化合物であり、前記式(2)で表される化合物が下記式(2-2)で表される化合物である、上記[1]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(3)で表される化合物であり、前記式(2)で表される化合物が式(4)で表される化合物である、上記[1]に記載のレジスト組成物。
[5]溶媒を更に含有する、上記[1]~[4]のいずれか1つに記載のレジスト組成物。
[6]酸発生剤を更に含有する、上記[1]~[5]のいずれか1つに記載のレジスト組成物。
[7]酸拡散制御剤を更に含有する、上記[1]~[6]のいずれか1つに記載のレジスト組成物。
[8]上記[1]~[7]のいずれか1つに記載のレジスト組成物を基板上に塗布してレジスト膜を形成する工程と、形成された前記レジスト膜を露光する工程と、露光した前記レジスト膜を現像する工程とを含む、レジストパターン形成方法。
すなわち、本発明は次のとおりである。
[9]下記式(3)又は(4)で表されるポリフェノール誘導体。
また、本発明により、耐熱性に優れ、安全溶媒に対する溶解性の高いポリフェノール誘導体を提供できる。
本実施の形態のレジスト組成物は、上記式(1)又は(2)で表される化合物を含有する。
本実施の形態の第1の態様において、レジスト組成物は、下記式(1)で表される化合物を含有する。
本実施の形態では、上記式(1)で表される化合物がナフタレン骨格を有することを主因として、耐熱性に優れる。
式(1)中、R1は、単結合、又は炭素数1~30の2n価の炭化水素基であり、該炭化水素基は環式炭化水素基(ただし芳香族基を除く。)、二重結合、ヘテロ原子若しくは炭素数6~30の芳香族基を有していてもよく、R2は、それぞれ独立して、水素原子、ハロゲン原子、炭素数1~10の直鎖状、分岐状若しくは環状のアルキル基、炭素数6~10のアリール基、炭素数2~10のアルケニル基、水酸基又は水酸基の水素原子が酸解離性基で置換された基であり、同一のナフタレン環又はベンゼン環において互いに同一であっても異なっていてもよく、R2の少なくとも1つは水酸基の水素原子が酸解離性基で置換された基であり、qはそれぞれ独立して0又は1である。繰り返し単位の構造式は互いに同一であっても異なっていてもよく、m1はそれぞれ独立して1~7の整数であり、nは1~4の整数である。耐熱性や解像度、ラフネス等のレジスト特性の点から、nは1~3であることが好ましい。
また、qは1であることが好ましい。すなわち、上記式(1)で表される化合物は、下記式(1-a)で表されるものであることが好ましい。
上記2n価の炭化水素基とは、n=1のときには、C1~30のアルキレン基、n=2のときには、C1~30のアルカンテトライル基、n=3のときには、C2~30のアルカンヘキサイル基、n=4のときには、C3~30のアルカンオクタイル基のことを示す。上記2n価の炭化水素基としては、例えば、直鎖状、分岐状又は環状構造を有するものが挙げられる。
また、上記2n価の炭化水素基は、環式炭化水素基(ただし芳香族基を除く。)、二重結合、ヘテロ原子(例えば、酸素原子、窒素原子及び硫黄原子)若しくはC6~30の芳香族基(例えば、ベンゼン環、ナフタレン環、アントラセン環を有する基)を有していてもよい。ここで、上記環式炭化水素基については、有橋環式炭化水素基も含まれ、具体的には、アダマンタン環を有する基、ノルボルネン環を有する基及びトリシクロデカン構造を有する基が挙げられる。
R2は、それぞれ独立して、水素原子、ハロゲン原子、C1~10の直鎖状、分岐状若しくは環状のアルキル基、C6~10のアリール基、C2~10のアルケニル基、水酸基又は水酸基の水素原子が酸解離性基で置換された基であり、同一のナフタレン環又はベンゼン環において互いに同一であっても異なっていてもよく、R2の少なくとも1つが水酸基の水素原子が酸解離性基で置換された基であり、m1はそれぞれ独立して1~7の整数である。
レジスト膜露光時の装置汚染抑制の点から、好ましいR2は、水素原子、C1~10の直鎖状、分岐状若しくは環状のアルキル基、C6~10のアリール基、C2~10のアルケニル基又は水酸基である。
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1-分岐アルキル基がより好ましい。1-分岐アルキル基の具体例としては、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、及び2-エチルアダマンチル基が挙げられる。
アシル基は、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のアシル基がより好ましい。アシル基の具体例としては、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、ベンゾイル基及びナフトイル基が挙げられる。
環状エーテル基は、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より好ましい。環状エーテル基の具体例としては、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及び4-メトキシテトラヒドロチオピラニル基が挙げられる。
ラクトンとしては、例えば、ブチロラクトン、及びラクトン基を有する炭素数3~12のシクロアルカン基が挙げられる。6~12の芳香族環としては、例えば、ベンゼン環、ナフタレン環、アントラセン環、フェナントレン環及びピレン環が挙げられ、ベンゼン環及びナフタレン環が好ましく、特にナフタレン環が好ましい。
酸解離性基として、特に下記式(13-4)で表される各基からなる群より選ばれる酸解離性基が、解像性が高いので好ましい。
上記式(1-2)で表される化合物は、qが1であること、すなわち、下記式(1-2-a)で表される化合物であることがより好ましい。
耐熱性や感度、解像度、ラフネス等のレジスト特性の点からは、上記式(1-1)で表される化合物は、上記式(1-1)中のnが1である化合物であることが好ましい。
また、溶解性の点から、上記式(1-1)で表される化合物は、下記式(1-3)で表される化合物であることがより好ましい。
また、上記式(3)で表される化合物は、下記式(3-1)で表される化合物であることが好ましい。
上記ポリフェノール化合物を製造する際、反応温度は、特に限定されず、反応原料の反応性に応じて適宜選択することができる。その反応温度は、10~200℃の範囲であることが好ましい。本実施の形態の上記式(1)で表される化合物を選択性よく合成するには、温度を低くするほどその効果が高くなり、10~60℃の範囲がより好ましい。
上記ポリフェノール化合物の製造方法は、特に限定されないが、例えば、ナフトール類又はチオナフトール類、アルデヒド類又はケトン類、並びに酸触媒を一括で仕込む方法、酸触媒存在下でナフトール類又はチオナフトール類、アルデヒド類又はケトン類を滴下していく方法が挙げられる。ポリフェノール化合物を得るための重縮合反応の終了後、系内に存在する未反応原料及び酸触媒等を除去するために、反応器の温度を130~230℃にまで上昇させ、1~50mmHg程度で揮発分を除去することもできる。
本実施の形態の第2の態様において、レジスト組成物は、下記式(2)で表される化合物を含有する。
qはそれぞれ独立して0又は1であるが、qが1であること、すなわち、上記式(2)で表される化合物は、下記式(2-a)で表されるものであることが好ましい。
なお、上記2n価の炭化水素基については、上述した式(1)で表される化合物におけるものと同義である。
qはそれぞれ独立して0又は1であるが、qは1であることがより好ましい。すなわち、上記式(2-1)で表される化合物は、下記式(2-1-a)で表される化合物であることがより好ましい。
qは1であることがより好ましい。すなわち、上記式(2-2)で表される化合物は、下記式(2-2-a)で表される化合物であることがより好ましい。
耐熱性や感度、解像度、ラフネス等のレジスト特性の点からは、上記式(2-1)で表される化合物は、上記式(2-1)中のnが1であることが好ましい。
また、上記式(4)で表される化合物は、下記式(4-1)で表される化合物であることが好ましい。
本実施の形態のレジスト組成物は、スピンコートによりレジスト膜としてのアモルファス膜を形成することができる。用いる現像液の種類によって、ポジ型レジストパターン及びネガ型レジストパターンのいずれかを選択的に作製することができる。
ポジ型レジストパターンの場合、本実施の形態のレジスト組成物をスピンコートして形成したアモルファス膜の23℃における現像液に対する溶解速度は、5Å/sec以下であることが好ましく、0.05~5Å/secであることがより好ましく、0.0005~5Å/secであることが更に好ましい。この溶解速度が5Å/sec以下であると、現像液により溶け難くなり、一層確実にレジストとすることができる。また、0.0005Å/sec以上の溶解速度を有すると、解像性が向上する場合もある。これは、上記式(1)又は(2)で表される化合物の露光前後の溶解性の変化により、現像液に溶解する露光部と、現像液に溶解しない未露光部との界面のコントラストが大きくなるからと推測される。また、溶解速度が0.0005Å/sec以上であると、ラインエッジラフネス(以下、「LER」と表記する。)の低減効果及びディフェクトの低減効果が更に高められる。
ネガ型レジストパターンの場合、本実施の形態のレジスト組成物をスピンコートして形成したアモルファス膜の23℃における現像液に対する溶解速度は、10Å/sec以上であることが好ましい。この溶解速度が10Å/sec以上であると、現像液により溶けやすくなり、レジストに一層適したものとなる。また、10Å/sec以上の溶解速度を有すると、解像性が向上する場合もある。これは、上記式(1)又は(2)で表される化合物のミクロの表面部位が溶解し、LERを低減するからと推測される。また、溶解速度が10Å/sec以上であると、ディフェクトの低減効果が更に高められる。
上記溶解速度は、23℃にて、アモルファス膜を所定時間現像液に浸漬させ、その浸漬前後の膜厚を、目視、エリプソメーター又はQCM法等の公知の方法によって測定し決定できる。
ネガ型レジストパターンの場合、本実施の形態のレジスト組成物をスピンコートして形成したアモルファス膜のKrFエキシマレーザー、極端紫外線、電子線又はX線等の放射線により露光した部分の23℃における現像液に対する溶解速度は、5Å/sec以下であることが好ましく、0.05~5Å/secであることがより好ましく、0.0005~5Å/secであることが更に好ましい。この溶解速度が5Å/sec以下であると、現像液により溶け難くなり、一層確実にレジストとすることができる。また、0.0005Å/sec以上の溶解速度を有すると、解像性が向上する場合もある。これは、上記式(1)又は(2)で表される化合物の露光前後の溶解性の変化により、現像液に溶解する未露光部と、現像液に溶解しない露光部との界面のコントラストが大きくなるからと推測される。また、溶解速度が0.0005Å/sec以上であると、LERの低減効果及びディフェクトの低減効果が更に高められる。
本実施の形態のレジスト組成物は、上記式(1)で表される化合物又は上記式(2)で表される化合物を固形成分として含有する。なお、本実施の形態のレジスト組成物は、上記式(1)で表される化合物及び上記式(2)で表される化合物の両方を含有してもよい。
本実施の形態で用いられる溶媒は、特に限定されないが、例えば、エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、エチレングリコールモノ-n-プロピルエーテルアセテート及びエチレングリコールモノ-n-ブチルエーテルアセテート等のエチレングリコールモノアルキルエーテルアセテート類;エチレングリコールモノメチルエーテル及びエチレングリコールモノエチルエーテルなどのエチレングリコールモノアルキルエーテル類;プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート(PGMEA)、プロピレングリコールモノ-n-プロピルエーテルアセテート、及びプロピレングリコールモノ-n-ブチルエーテルアセテート等のプロピレングリコールモノアルキルエーテルアセテート類;プロピレングリコールモノメチルエーテル(PGME)及びプロピレングリコールモノエチルエーテル等のプロピレングリコールモノアルキルエーテル類;乳酸メチル、乳酸エチル、乳酸n-プロピル、乳酸n-ブチル及び乳酸n-アミル等の乳酸エステル類;酢酸メチル、酢酸エチル、酢酸n-プロピル、酢酸n-ブチル、酢酸n-アミル、酢酸n-ヘキシル、プロピオン酸メチル及びプロピオン酸エチル等の脂肪族カルボン酸エステル類;3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、3-エトキシプロピオン酸エチル、3-メトキシ-2-メチルプロピオン酸メチル、3-メトキシブチルアセテート、3-メチル-3-メトキシブチルアセテート、3-メトキシ-3-メチルプロピオン酸ブチル、3-メトキシ-3-メチル酪酸ブチル、アセト酢酸メチル、ピルビン酸メチル及びピルビン酸エチル等の他のエステル類;トルエン及びキシレン等の芳香族炭化水素類;メチルエチルケトン、2-ヘプタノン、3-ヘプタノン、4-ヘプタノン、シクロペンタノン(CPN)及びシクロヘキサノン(CHN)等のケトン類;N,N-ジメチルホルムアミド、N-メチルアセトアミド、N,N-ジメチルアセトアミド及びN-メチルピロリドン等のアミド類;γ-ラクトン等のラクトン類が挙げられる。これらの溶媒は、1種を単独で又は2種以上を組み合わせて用いられる。
本実施の形態で用いられる溶媒は、安全溶媒であることが好ましく、より好ましくは、PGMEA、PGME、CHN、CPN、2-ヘプタノン、アニソール、酢酸ブチル、プロピオン酸エチル及び乳酸エチルからなる群より選ばれる少なくとも1種であり、更に好ましくはPGMEA、PGME及びCHNからなる群より選ばれる少なくとも1種である。
レジスト組成物における固形成分の含有量及び溶媒の含有量は、特に限定されないが、固形成分及び溶媒の合計含有量100質量%に対して、固形成分の含有量が1~80質量%、かつ溶媒の含有量が20~99質量%であることが好ましく、より好ましくは固形成分の含有量が1~50質量%、かつ溶媒の含有量が50~99質量%、更に好ましくは固形成分の含有量が2~40質量%、かつ溶媒の含有量が60~98質量%であり、特に好ましくは固形成分の含有量が2~10質量%かつ溶媒の含有量が90~98質量%である。
なお、レジスト組成物が、上記式(1)で表される化合物及び上記式(2)で表される化合物の両方を含有する場合、上記式(1)又は(2)で表される化合物の含有量は、上記式(1)で表される化合物及び上記式(2)で表される化合物の合計含有量である。
この場合、レジスト組成物における酸発生剤の含有量は、固形成分の全質量に対して0.001~49質量%が好ましく、1~40質量%がより好ましく、3~30質量%が更に好ましく、10~25質量%が特に好ましい。レジスト組成物が酸発生剤を上記範囲内で含むことにより、一層高感度でかつ一層低LFRのパターンプロファイルが得られる。
本実施の形態では、系内に酸が発生すれば、酸の発生方法は限定されない。g線、i線などの紫外線の代わりにエキシマレーザーを使用すれば、より微細な加工が可能となり、また、高エネルギー線として電子線、極端紫外線、X線、イオンビームを使用すれば、更に微細な加工が可能となる。
上記酸発生剤は、1種を単独で又は2種以上を組み合わせて用いられる。
このような酸拡散制御剤は、特に限定されず、例えば、窒素原子含有塩基性化合物、塩基性スルホニウム化合物及び塩基性ヨードニウム化合物等の放射線分解性塩基性化合物が挙げられる。酸拡散制御剤は、1種を単独で又は2種以上を組み合わせて用いることができる。
溶解促進剤は、式(1)又は(2)で表される化合物の現像液に対する溶解性が低い場合に、その溶解性を高めて、現像時の上記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る。溶解促進剤は、本発明の効果を損なわない範囲で用いることができる。溶解促進剤としては、例えば、低分子量のフェノール性化合物が挙げられ、例えば、ビスフェノール類及びトリス(ヒドロキシフェニル)メタンが挙げられる。これらの溶解促進剤は、1種を単独で又は2種以上を混合して用いることができる。レジスト組成物が溶解促進剤を含有する場合のその含有量は、用いる式(1)又は(2)で表される化合物の種類に応じて適宜調節されるが、固形成分の全質量に対して0質量%超49質量%以下が好ましく、0質量%超5質量%以下がより好ましく、0質量%超1質量%以下が更に好ましい。ただし、本発明による効果を低減させない観点から、溶解促進剤を用いないことが特に好ましい。
溶解制御剤は、式(1)又は(2)で表される化合物の現像液に対する溶解性が高い場合に、その溶解性を制御して、現像時の上記化合物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、放射線照射及び現像等の工程において化学変化しないものが好ましい。
レジスト組成物が溶解制御剤を含有する場合のその含有量は、特に限定されず、用いる式(1)又は(2)で表される化合物の種類に応じて適宜調節されるが、固形成分の全質量に対して0質量%超49質量%以下が好ましく、0質量%超5質量%以下がより好ましく、0質量%超1質量%以下が更に好ましい。ただし、本発明による効果を低減させない観点から、溶解制御剤を用いないことが特に好ましい。
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、特に限定されず、例えば、ベンゾフェノン類、ビアセチル類、ピレン類、フェノチアジン類及びフルオレン類が挙げられる。これらの増感剤は、1種を単独で又は2種以上を混合して用いることができる。レジスト組成物が増感剤を含有する場合のその含有量は、用いる式(1)又は(2)で表される化合物の種類に応じて適宜調節されるが、固形成分の全質量に対して0質量%超49質量%以下が好ましく、0質量%超5質量%以下がより好ましく、0質量%超1質量%以下が更に好ましい。ただし、本発明による効果を低減させない観点から、増感剤を用いないことが特に好ましい。
界面活性剤は、本実施の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、ノニオン系及び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良好であり、界面活性剤としての効果がより高い。ノニオン系界面活性剤の例としては、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及びポリエチレングリコールの高級脂肪酸ジエステル類が挙げられるが、特に限定されない。市販品としては、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)、及びポリフロー(共栄社油脂化学工業社製)を挙げられる。レジスト組成物が界面活性剤を含有する場合のその含有量は、特に限定されず、用いる式(1)又は(2)で表される化合物の種類に応じて適宜調節されるが、固形成分の全質量に対して0質量%超49質量%以下が好ましく、0質量%超5質量%以下がより好ましく、0質量%超1質量%以下が更に好ましい。ただし、本発明による効果を低減させない観点から、界面活性剤を用いないことが特に好ましい。
本実施の形態のレジスト組成物は、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してもよい。なお、これらの成分は、酸拡散制御剤と併用することもできるし、単独で用いてもよい。有機カルボン酸としては、例えば、マロン酸、クエン酸、リンゴ酸、コハク酸、安息香酸及びサリチル酸が好適である。リンのオキソ酸若しくはその誘導体としては、リン酸、リン酸ジ-n-ブチルエステル及び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等の誘導体;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及び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等の誘導体;ホスフィン酸及びフェニルホスフィン酸などのホスフィン酸及びそれらのエステル等の誘導体が挙げられる。これらの中では、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、1種を単独で又は2種以上を混合して用いられる。レジスト組成物が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する場合のその含有量は、用いる式(1)又は(2)で表される化合物の種類に応じて適宜調節されるが、固形成分の全質量に対して0質量超49質量%以下が好ましく、0質量%超5質量%以下がより好ましく、0質量%超1質量%以下が更に好ましい。ただし、本発明による効果を低減させない観点から、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用いないことが特に好ましい。
さらに、本実施の形態のレジスト組成物には、本発明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、界面活性剤及び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以外のその他の添加剤を1種又は2種以上含有できる。そのような添加剤としては、例えば、染料、顔料、及び接着助剤等が挙げられる。例えば、レジスト組成物が染料又は顔料を含有すると、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、レジスト組成物が接着助剤を含有すると、基板との接着性を改善することができるので好ましい。さらに、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。
各成分の含有割合は、その総和が100質量%になるように各範囲から選ばれる。上記範囲の含有割合にすると、感度、解像度、現像性等の性能に一層優れる。
本実施の形態によるレジストパターンの形成方法は、特に限定されず、好適な方法として、上述した本実施の形態のレジスト組成物を基板上に塗布してレジスト膜を形成する工程と、形成された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してレジストパターンを形成する工程とを含む方法が挙げられる。
本実施の形態の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。
本実施の形態においては、露光における高精度の微細パターンを安定して形成するために、放射線照射後に加熱するのが好ましい。加熱条件は、レジスト組成物の組成等により変更すればよいが、20~250℃が好ましく、より好ましくは20~150℃である。
上記現像液としては、用いられる式(1)又は(2)で表される化合物に対して溶解度パラメーター(SP値)の近い溶剤を含有することが好ましい。現像液に含まれる溶剤としては、例えば、ケトン系溶剤、エステル系溶剤、アルコール系溶剤、アミド系溶剤及びエーテル系溶剤等の極性溶剤や炭化水素系溶剤などの有機溶剤、並びにアルカリ水溶液が挙げられる。
現像液の種類によって、ポジ型レジストパターン又はネガ型レジストパターンを選択的に作製することができる。一般的に、現像液が、ケトン系溶剤、エステル系溶剤、アルコール系溶剤、アミド系溶剤、及びエーテル系溶剤等の極性溶剤、並びに炭化水素系溶剤を含む場合は、ネガ型レジストパターンが得られ、アルカリ水溶液を含む場合はポジ型レジストパターンが得られる。
そのような界面活性剤としては特に限定されないが、例えば、イオン性や非イオン性のフッ素系及び/又はシリコン系界面活性剤が挙げられる。これらのフッ素及び/又はシリコン系界面活性剤として、例えば、特開昭62-36663号公報、特開昭61-226746号公報、特開昭61-226745号公報、特開昭62-170950号公報、特開昭63-34540号公報、特開平7-230165号公報、特開平8-62834号公報、特開平9-54432号公報、特開平9-5988号公報、米国特許第5405720号明細書、同5360692号明細書、同5529881号明細書、同5296330号明細書、同5436098号明細書、同5576143号明細書、同5294511号明細書、及び同5824451号明細書記載の界面活性剤を挙げることができ、好ましくは、非イオン性の界面活性剤である。非イオン性の界面活性剤としては特に限定されないが、フッ素系界面活性剤又はシリコン系界面活性剤を用いることがより好ましい。
より好ましくは、リンス工程において用いられるリンス液が、ケトン系溶剤、エステル系溶剤、アルコール系溶剤及びアミド系溶剤からなる群より選ばれる少なくとも1種の有機溶剤を含有する。さらに好ましくは、リンス工程において用いられるリンス液が、アルコール系溶剤及び/又はエステル系溶剤を含有する。なおもさらに好ましくは、リンス工程において用いられるリンス液が、1価アルコールを含有する。特に好ましくは、リンス工程において用いられるリンス液が、C5以上の1価アルコールを含有する。リンス工程に要する時間には特に制限はないが、好ましくは10秒~90秒である。
本実施の形態のポリフェノール誘導体は、下記式(3)で表される化合物又は下記式(4)で表されるポリフェノール誘導体である。
また、上記式(3)で表される化合物及び上記式(4)で表されるポリフェノール誘導体は、それぞれ、下記式(3-1)で表される化合物及び下記式(4-1)で表される化合物であることが好ましい。
ナフタレン環における-OR4の位置は、特に限定されないが、原料の産業利用性の点から、1,5位、1,6位、1,7位、2,3位、2,7位、又は2,6位であることが好ましく、安全溶媒への溶解性が一層高く、結晶性が低い点から、2,6位であることがより好ましい。
以下に、実施例における化合物の測定方法及びレジスト性能等の評価方法を示す。
(1)化合物の構造
化合物の構造は、Bruker社製の測定装置であるAdvance600II spectrometer(製品名)を用いて、以下の条件で、1H-NMR測定を行い、確認した。
周波数:400MHz
溶媒:d6-DMSO(合成例4以外)
内部標準:TMS
測定温度:23℃
化合物は、GC-MS分析により、Agilent社製の分析装置であるAgilent5975/6890N(製品名)を用いて測定した。あるいは、LC-MS分析により、Water社製の分析装置であるAcquity UPLC/MALDI-Synapt HDMS(製品名)を用いて測定した。
23℃にて、アモルファス膜を所定時間現像液に浸漬させ、その浸漬前後の膜厚を目視にて確認し、溶解速度を決定した。
(1)化合物の安全溶媒溶解度試験
化合物のCHN、PGME及びPGMEAへの溶解性は、各溶媒への溶解量を用いて以下の基準で評価した。なお、溶解量は、23℃にて、化合物を試験管に精秤し、対象となる溶媒を所定の濃度となるよう加え、超音波洗浄機にて30分間超音波をかけ、その後の液の状態を目視にて測定することにより求めた。
A:5.0質量%≦溶解量
B:3.0質量%≦溶解量<5.0質量%
C:溶解量<3.0質量%
調製した各レジスト組成物について、以下の手順で耐熱性評価を行った。
レジストを清浄なシリコンウェハ上に回転塗布した後、110℃のオーブン中で加熱(ベーク)して、厚さ60nmのレジスト膜を形成した。それらの膜を目視で観察した。欠陥のない良好な膜である場合、耐熱性は良好であると判断し、「○」と評価し、欠陥が認められた場合は、耐熱性が良好ではないと判断し、「×」と評価した。
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(製品名))により観察し、解像度30nmのパターンについて、パターン形状、ラインエッジラフネス及び感度が良好であるか否かについて評価を行った。
パターン形状は矩形であれば良好と判断した。LER(ラインエッジラフネス)は、50nm間隔の1:1のラインアンドスペースの長さ方向(0.75μm)の任意の300点において、(株)日立ハイテクノロジー社製半導体用SEMに対応するターミナルPC V5オフライン測長ソフトウェア((株)日立サイエンスシステムズ製)を用いて、エッジと基準線との距離を測定して算出した標準偏差(3σ)が5nm未満である場合を良好と判断した。パターンの解像度は良好に形成できたパターンの最小線幅のものとした。また、パターンを良好に形成できたときの最小のドーズ量(μC/cm2)を感度とし、その感度が150μC/cm2未満である場合を良好と判断した。
パターン形状、LER及び感度の全てが良好である場合には「○」と評価し、それ以外の場合を「×」と評価した。
(合成例1)BisN-1の合成
攪拌機、冷却管及びビュレットを備えた内容積100mLの容器に30mLのメチルイソブチルケトンを注入した後、そこに2,6-ナフタレンジオール(シグマ-アルドリッチ社製試薬)3.20g(20mmol)と4-ビフェニルカルボキシアルデヒド(三菱瓦斯化学社製)1.82g(10mmol)とを仕込み、95%の硫酸5mLを加えた。得られた反応液を30℃で6時間撹拌しながら反応を進行させた。次に反応後の液を濃縮し、純水50gを加えて反応生成物を析出させ、室温まで冷却した後、濾過により分離した。
得られた固形物を更に濾過し、乾燥させた後、カラムクロマトによる分離精製を行うことで、下記式で表される目的化合物(BisN-1)0.2gを得た。
得られた化合物について、上記方法により分子量を測定した結果、484であった。
得られた化合物について、上記測定条件で、NMR測定を行ったところ、以下のピークが見出され、下記式の化学構造を有することを確認した。
δ(ppm)9.3~9.4(4H,O-H)、7.0~8.5(17H,Ph-H)、6.8(1H,C-H)
なお、2,6-ナフタレンジオールの置換位置が1位であることは、3位と4位のプロトンのシグナルがダブレットであることから確認した。
(合成実施例1)BisN-1-BOCの合成
攪拌機、冷却管及びビュレットを備えた内容積200mLの容器に100mLのアセトンを注入した後、そこにBisN-1 6.1g(12.5mmol)とジ-t-ブチルジカーボネート(アルドリッチ社製)11.0g(50mmol)とを仕込み、炭酸カリウム(アルドリッチ社製)6.9g(50mmol)を加えた。得られた反応液を20℃で6時間撹拌しながら反応を進行させた。次に反応後の液を濃縮し、純水100gを加えて反応生成物を析出させ、室温まで冷却した後、濾過により分離した。
得られた固形物を更に濾過し、乾燥させた後、カラムクロマトによる分離精製を行うことで、下記式で表される目的化合物(BisN-1-BOC)2.0gを得た。
得られた化合物について、上記方法により分子量を測定した結果、884であった。
得られた化合物について、上記測定条件で、NMR測定を行ったところ、以下のピークが見出され、下記式の化学構造を有することを確認した。
δ(ppm)7.2~8.7(17H,Ph-H)、6.7(1H,C-H)、1.6(36H,C-CH 3)
攪拌機、冷却管及びビュレットを備えた内容積200mLの容器に100mLのアセトンを注入した後、そこにBisN-1 5.8g(12.4mmol)とブロモ酢酸t-ブチル(アルドリッチ社製)10.8g(54mmol)とを仕込み、炭酸カリウム(アルドリッチ社製)7.6g(54mmol)及び18-クラウン-6 1.6gを加えた。得られた反応液を還流下で3時間撹拌しながら反応を進行させた。次に反応後の液を濃縮し、純水100gを加えて反応生成物を析出させ、室温まで冷却した後、濾過により分離した。
得られた固形物を更に濾過し、乾燥させた後、カラムクロマトによる分離精製を行うことで、下記式で表される目的化合物(BisN-1-MeBOC)を1.5g得た。
得られた化合物について、上記方法により分子量を測定した結果、940であった。
得られた化合物について、上記測定条件で、NMR測定を行ったところ、以下のピークが見出され、下記式の化学構造を有することを確認した。
δ(ppm)7.2~8.7(17H,Ph-H)、6.7(1H,C-H)、4.7~4.8(8H,C-CH 2-C)、1.3~1.4(36H,C-CH 3)
攪拌機、冷却管及びビュレットを備えた内容積100mLの容器に30mLのメチルイソブチルケトン注入した後、そこに2,6-ナフタレンジオール(シグマ-アルドリッチ社製試薬)3.20g(20mmol)と4-ビフェニルカルボキシアルデヒド(三菱瓦斯化学社製)1.82g(10mmol)とを仕込み、95%の硫酸5mLを加えた。得られた反応液を30℃で6時間撹拌しながら反応を進行させた。次に反応後の液を濃縮し、純水50gを加えて反応生成物を析出させ、室温まで冷却した後、濾過により分離した。
得られた固形物を更に濾過し、乾燥させた後、カラムクロマトによる分離精製を行うことで、下記式で表される目的化合物(XBisN-1)0.2gを得た。
得られた化合物について、上記方法により分子量を測定した結果、466であった。
得られた化合物について、上記測定条件で、NMR測定を行ったところ、以下のピークが見出され、下記式の化学構造を有することを確認した。
δ(ppm)9.3~9.4(4H,O-H)、7.0~8.5(19H,Ph-H)、6.8(1H,C-H)
なお、2,6-ナフタレンジオールの置換位置が1位であることは、3位と4位のプロトンのシグナルがダブレットであることから確認した。
攪拌機、冷却管及びビュレットを備えた内容積200mLの容器に100mLのアセトンを注入した後、そこにXBisN-1 5.8g(12.5mmol)とジ-t-ブチルジカーボネート(アルドリッチ社製)5.5g(25mmol)とを仕込み、炭酸カリウム(アルドリッチ社製)3.45g(25mmol)を加えた。得られた反応液を20℃で6時間撹拌しながら反応を進行させた。次に反応後の液を濃縮し、純水100gを加えて反応生成物を析出させ、室温まで冷却した後、濾過により分離した。
得られた固形物を更に濾過し、乾燥させた後、カラムクロマトによる分離精製を行うことで、下記式で表される目的化合物(XBisN-1-BOC)2.0gを得た。
得られた化合物について、上記方法により分子量を測定した結果、666であった。
得られた化合物について、上記測定条件で、NMR測定を行ったところ、以下のピークが見出され、下記式の化学構造を有することを確認した。
δ(ppm)7.2~8.7(19H,Ph-H)、6.8(1H,C-H)、1.6(18H,C-CH 3)
攪拌機、冷却管及びビュレットを備えた内容積200mLの容器に100mLのアセトンを注入した後、そこにXBisN-1 5.8g(12.4mmol)とブロモ酢酸t-ブチル(アルドリッチ社製)5.4g(27mmol)とを仕込み、炭酸カリウム(アルドリッチ社製)3.8g(27mmol)及び18-クラウン-6 0.8gを加えた。得られた反応液を還流下で3時間撹拌しながら反応を進行させた。次に反応後の液を濃縮し、純水100gを加えて反応生成物を析出させ、室温まで冷却した後、濾過により分離した。
得られた固形物を更に濾過し、乾燥させた後、カラムクロマトによる分離精製を行うことで、下記式で表される目的化合物(XBisN-1-MeBOC)1.8gを得た。
得られた化合物について、上記方法により分子量を測定した結果、694であった。
得られた化合物について、上記測定条件で、NMR測定を行ったところ、以下のピークが見出され、下記式の化学構造を有することを確認した。
δ(ppm)7.2~8.7(19H,Ph-H)、6.7(1H,C-H)、4.7~4.8(4H,C-CH 2-C)、1.3~1.4(18H,C-CH 3)
十分乾燥し、窒素置換した滴下漏斗、ジム・ロート氏冷却管、温度計及び攪拌翼を設置した四つ口フラスコ(1000mL)に、窒素気流下で、本州化学工業社製2,3,6-トリメチルフェノール108.8g(0.8mol)及び三菱瓦斯化学社製2,7-ナフタレンジカルボキシアルデヒド18.4g(0.1mol)を投入して混合し、約60℃に加熱して溶解した。そこに、硫酸0.1mL、3-メルカプトプロピオン酸0.8mL及びトルエン10mLを加え、撹拌しながら反応を進行させた。
反応後の液を放冷し、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生成し、これを濾別した。濾別した粗結晶を、60℃温水で撹拌洗浄し、再結晶させることで、下記式で表される目的生成物(TetP-1)8.99gを得た。続いて、BisN-1に代えてTetP-1を用いた以外は合成実施例1と同様にして、TetP-1とジ-t-ブチルジカーボネートとを反応させ、下記式で表される目的化合物(TetP-1-BOC)2.50gを得た。
得られた化合物について、上記測定条件で、NMR測定を行い、下記式の化学構造を有することを確認した。
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HF74.3g(3.71mol)及びBF350.5g(0.744mol)を仕込み、内容物を撹拌し、液温を-30℃に保持し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℃に保持したまま、4-シクロヘキシルベンゼン57.0g(0.248mol)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。続いて、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ところ、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、下記式で表される4-シクロヘキシルベンズアルデヒド(CHBAL)の分子量188を示した。また、得られた化合物について、上記測定条件で、NMR測定を行い、下記式の化学構造を有することを確認した。
得られた化合物について、上記測定条件で、NMR測定を行い、下記式の化学構造を有することを確認した。
〔レジスト組成物の合成〕
(実施例1~4及び比較例1~2)
上記で合成したポリフェノール誘導体を用いて、表1に示す配合でレジスト組成物を調製した。なお、表1中のレジスト組成物の各成分のうち、酸発生剤、酸拡散制御剤及び溶媒については、以下のものを用いた。
酸発生剤(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)製)
酸拡散制御剤(Q-1):トリオクチルアミン(東京化成工業(株)製)
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)製)
得られたレジストパターンについて、上記方法により、パターン評価を実施した。得られた結果を表1に示す。
得られたレジストパターンについて、上記方法により、パターン評価を実施した。得られた結果を表1に示す。
また、表1から明らかなように、実施例1~4のレジストは、解像度30nmの良好なレジストパターンを、良好な感度で得ることができた。また、そのパターンのラフネスも小さく、形状も良好であった。一方、比較例1~2のレジストは、解像度40nm、30nmのいずれもレジストパターンを得ることはできなかった。
また、本発明により、耐熱性に優れ、安全溶媒に対する溶解性の高いポリフェノール誘導体を提供できる。したがって、本発明は、半導体用フォトレジスト等の感光性材料の基材、集積回路の封止材料等に用いられるエポキシ樹脂の原料や硬化剤、感熱記録材料に用いられる顕色剤や退色防止剤、このほか、殺菌剤、防菌防カビ剤等の添加剤などに好適に利用される。
Claims (9)
- 下記式(1)又は(2)で表される化合物を含有するレジスト組成物。
- 前記式(1)で表される化合物が下記式(1-1)で表される化合物であり、前記式(2)で表される化合物が式(2-1)で表される化合物である、請求項1に記載のレジスト組成物。
- 前記式(1)で表される化合物が下記式(1-2)で表される化合物であり、前記式(2)で表される化合物が下記式(2-2)で表される化合物である、請求項1に記載のレジスト組成物。
- 溶媒を更に含有する、請求項1~4のいずれか1項に記載のレジスト組成物。
- 酸発生剤を更に含有する、請求項1~5のいずれか1項に記載のレジスト組成物。
- 酸拡散制御剤を更に含有する、請求項1~6のいずれか1項に記載のレジスト組成物。
- 請求項1~7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てレジスト膜を形成する工程と、形成された前記レジスト膜を露光する工程と、露光した前記レジスト膜を現像する工程とを含む、レジストパターン形成方法。
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CN104995559A (zh) | 2015-10-21 |
EP2955575B1 (en) | 2020-07-29 |
EP2955575A1 (en) | 2015-12-16 |
CN104995559B (zh) | 2020-04-07 |
US20150376157A1 (en) | 2015-12-31 |
JP6344607B2 (ja) | 2018-06-20 |
EP2955575A4 (en) | 2016-09-07 |
JPWO2014123032A1 (ja) | 2017-02-02 |
KR102159234B1 (ko) | 2020-09-23 |
TWI589553B (zh) | 2017-07-01 |
KR20150118132A (ko) | 2015-10-21 |
TW201446711A (zh) | 2014-12-16 |
US10377734B2 (en) | 2019-08-13 |
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