Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F24/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a heterocyclic ring containing oxygen
• • 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
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/004—Photosensitive materials
  • G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/20—Exposure; Apparatus therefor

Definitions

• the present invention relates to a positive actinic ray-sensitive or radiation-sensitive resin composition, an actinic ray-sensitive or radiation-sensitive film, a pattern forming method, an electronic device manufacturing method, and a compound.
• immersion liquid a liquid with a high refractive index
• Patent Documents 1 and 2 disclose, as a resin component contained in a resist composition, a repeating monomer derived from a monomer having a cyclic protected structure in which two hydroxyl groups, which are polar groups in dihydroxystyrene, are protected by dimethylmethylene. Resin containing units are described.
• the present invention provides a positive impression that is excellent in resolution, has excellent roughness performance, and can obtain an excellent pattern shape in ultrafine pattern formation (especially, line width or space width is 20 nm or less).
• Actinic ray- or radiation-sensitive resin composition, actinic ray- or radiation-sensitive resin film formed from the actinic ray- or radiation-sensitive resin composition, actinic ray- or radiation-sensitive resin composition It is an object of the present invention to provide a pattern forming method and an electronic device manufacturing method using , and a compound that can be suitably used in the actinic ray-sensitive or radiation-sensitive resin composition.
• a positive actinic ray-sensitive or radiation-sensitive resin composition containing the following (A) and (B).
• Each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• A represents an aromatic ring group or an aromatic heterocyclic group.
• X represents a single bond, an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a combination thereof. X may combine with the A ring to form a benzene ring.
• Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom.
• R 12 may combine with the A ring to form a ring, in which case R 12 represents a single bond or an alkylene group.
• n represents an integer of 1 to 6; When X is a single bond, the total number of carbon atoms contained in 2n R 1 is 4 or more.
• Each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• a 1 represents a benzene ring group.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom. However, R 12 may combine with the benzene ring in general formula (a-1) to form a ring, in which case R 12 represents a single bond or an alkylene group.
• R 61 to R 63 each independently represent a hydrogen atom, an organic group, or a halogen atom.
• R 62 may combine with Ar to form a ring, in which case R 62 represents a single bond or an alkylene group.
• L represents a single bond or a divalent linking group.
• Ar represents a (k+1)-valent aromatic ring group, and when combined with R 62 to form a ring, represents a (k+2)-valent aromatic ring group.
• k represents an integer of 1 to 5;
• Each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• A represents an aromatic ring group or an aromatic heterocyclic group.
• Xb represents an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a combination thereof. Xb may combine with the A ring to form a benzene ring.
• Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom.
• R 12 may combine with the A ring to form a ring, in which case R 12 represents a single bond or an alkylene group.
• n represents an integer of 1 to 6;
• Each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• a 1 represents a benzene ring group.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom. However, R 12 may combine with the benzene ring in general formula (b-1) to form a ring, in which case R 12 represents a single bond or an alkylene group.
• the positive sensitization is excellent in resolution, further excellent in roughness performance, and excellent in pattern shape.
• a light or radiation-sensitive resin composition, an actinic light-sensitive or radiation-sensitive resin film formed from the actinic light-sensitive or radiation-sensitive resin composition, and an actinic light-sensitive or radiation-sensitive resin composition It is possible to provide a pattern forming method and an electronic device manufacturing method to be used, and a compound that can be suitably used for the actinic ray-sensitive or radiation-sensitive resin composition.
• the present invention will be described in detail below. The description of the constituent elements described below may be made based on representative embodiments of the present invention, but the present invention is not limited to such embodiments.
• the notation that does not describe substituted or unsubstituted includes groups containing substituents as well as groups that do not have substituents. do.
• an "alkyl group” includes not only an alkyl group having no substituent (unsubstituted alkyl group) but also an alkyl group having a substituent (substituted alkyl group).
• the term "organic group” as used herein refers to a group containing at least one carbon atom. As a substituent, a monovalent substituent is preferable unless otherwise specified.
• the type of substituent, the position of the substituent, and the number of substituents when "may have a substituent” are not particularly limited.
• the number of substituents can be, for example, one, two, three, or more.
• substituents include monovalent nonmetallic atomic groups excluding hydrogen atoms, and can be selected from the following substituents T, for example.
• the substituent T includes halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkoxy group such as a methoxy group, an ethoxy group and a tert-butoxy group; an aryloxy group such as a phenoxy group and a p-tolyloxy group; alkoxycarbonyl groups such as methoxycarbonyl group, butoxycarbonyl group and phenoxycarbonyl group; acyloxy groups such as acetoxy group, propionyloxy group and benzoyloxy group; acetyl group, benzoyl group, isobutyryl group, acryloyl group, methacryloyl group and methoxalyl group, etc.
• halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom
• an alkoxy group such as
• Alkylsulfanyl groups such as a methylsulfanyl group and a tert-butylsulfanyl group; Arylsulfanyl groups such as a phenylsulfanyl group and a p-tolylsulfanyl group; Alkyl groups; Cycloalkyl groups; carboxy group; formyl group; sulfo group; cyano group; alkylaminocarbonyl group; arylaminocarbonyl group; sulfonamide group; silyl group; amino group; and combinations thereof.
• actinic ray or “radiation” means, for example, the emission line spectrum of a mercury lamp, far ultraviolet rays represented by excimer lasers, extreme ultraviolet rays (EUV: Extreme Ultraviolet), X-rays, and electron beams (EB : Electron Beam).
• light means actinic rays or radiation.
• exposure means, unless otherwise specified, not only exposure by the emission line spectrum of a mercury lamp, far ultraviolet rays represented by excimer lasers, extreme ultraviolet rays, and X-rays, but also electron beams and ion beams. It also includes drawing with particle beams such as beams.
• the term "to” is used to include the numerical values before and after it as lower and upper limits.
• the binding direction of the divalent linking groups indicated is not limited unless otherwise specified.
• Y when Y is -COO-, Y may be -CO-O- or -O-CO- good too.
• the compound may be "X—CO—O—Z” or "X—O—CO—Z.”
• (meth)acrylate refers to acrylate and methacrylate
• (meth)acryl refers to acrylic and methacrylic.
• weight average molecular weight (Mw), number average molecular weight (Mn), and dispersity (hereinafter also referred to as "molecular weight distribution") (Mw/Mn) are measured by GPC (Gel Permeation Chromatography) equipment (Tosoh Corporation).
• the acid dissociation constant (pKa) represents the pKa in an aqueous solution. is a calculated value.
• Software Package 1 Advanced Chemistry Development (ACD/Labs) Software V8.14 for Solaris (1994-2007 ACD/Labs).
• pKa can also be determined by molecular orbital calculation.
• a specific method there is a method of calculating the H 2 + dissociation free energy in an aqueous solution based on the thermodynamic cycle.
• the H + dissociation free energy can be calculated by, for example, DFT (density functional theory), but various other methods have been reported in literature, etc., and the method is not limited to this. Note that there are a plurality of software that can implement DFT, and Gaussian16 is an example.
• pKa refers to a value obtained by calculating a value based on Hammett's substituent constant and a database of known literature values using Software Package 1, as described above. cannot be calculated, a value obtained by Gaussian 16 based on DFT (density functional theory) shall be adopted.
• pKa refers to "pKa in aqueous solution” as described above, but when pKa in aqueous solution cannot be calculated, “pKa in dimethyl sulfoxide (DMSO) solution” is adopted.
• Solid content means the components forming the actinic ray-sensitive or radiation-sensitive film, and does not include solvent. In addition, as long as it is a component that forms an actinic ray-sensitive or radiation-sensitive film, it is regarded as a solid content even if the property is liquid.
• the positive actinic ray-sensitive or radiation-sensitive resin composition contains the following (A) and (B).
• each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• A represents an aromatic ring group or an aromatic heterocyclic group.
• X represents a single bond, an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a combination thereof. X may combine with the A ring to form a benzene ring.
• Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom.
• R 12 may combine with the A ring to form a ring, in which case R 12 represents a single bond or an alkylene group.
• n represents an integer of 1 to 6; When X is a single bond, the total number of carbon atoms contained in 2n R 1 is 4 or more.
• the repeating unit (a) contained in the resin (A) used in the positive actinic ray-sensitive or radiation-sensitive resin composition of the present invention (hereinafter also referred to as "the composition of the present invention") has two polar groups. It includes an acid-decomposable group having a condensed ring structure protected by an alkylene bond represented by -(CR 1 R 1 )n-.
• the molecular structure becomes rigid and the glass transition temperature (Tg) of the resin becomes high, so that the diffusion of acid in the actinic ray-sensitive or radiation-sensitive film is suppressed and the resolution is improved. is improved, and roughness performance and pattern shape are also improved.
• a resin containing an acid-decomposable group protected by one leaving group for one polar group is usually used. Since it is a protected acid-decomposable group, the difference in hydrophilicity/hydrophobicity before and after deprotection ( ⁇ ClogP) increases, and the solubility contrast of the resin in the exposed area and the unexposed area in the developer can be increased. Better resolution.
• the acid-decomposable group in the repeating unit (a) in the present invention has higher deprotection reactivity than the conventionally known structure in which two hydroxyl groups in dihydroxystyrene are protected by dimethylmethylene. Since the solubility contrast in the developer can be further increased, it has become possible to improve the resolution in particular.
• the positive actinic ray-sensitive or radiation-sensitive resin composition of the present invention is typically a resist composition, and a resist composition for alkali development.
• the positive actinic ray-sensitive or radiation-sensitive resin composition of the present invention may be a chemically amplified resist composition or a non-chemically amplified resist composition.
• the positive actinic ray-sensitive or radiation-sensitive resin composition of the present invention is typically a chemically amplified resist composition.
• the composition of the present invention contains a resin containing repeating units (a) represented by the following general formula (a).
• the repeating unit (a) is a repeating unit containing a group that is decomposed by the action of an acid to increase its polarity (hereinafter also referred to as "acid-decomposable group").
• An acid-decomposable group is a group that is decomposed by the action of an acid to form a polar group.
• the acid-decomposable group preferably has a structure in which the polar group is protected by a group (leaving group) that is eliminated by the action of an acid.
• two polar groups have a structure protected by an alkylene bond represented by -(CR 1 R 1 )n-.
• the resin (A) becomes more polar under the action of an acid, and its solubility in an alkaline developer increases.
• each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• A represents an aromatic ring group or an aromatic heterocyclic group.
• X represents a single bond, an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a combination thereof. X may combine with the A ring to form a benzene ring.
• Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom.
• R 12 may combine with the A ring to form a ring, in which case R 12 represents a single bond or an alkylene group.
• n represents an integer of 1 to 6; When X is a single bond, the total number of carbon atoms contained in 2n R 1 is 4 or more.
• each R 1 independently represents a hydrogen atom or a substituent.
• Substituents represented by R 1 include an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group.
• At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group.
• alkyl groups represented by R 1 include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, hexyl group, 2-ethylhexyl group and octyl group. Examples include alkyl groups having 1 to 12 carbon atoms.
• the cycloalkyl group represented by R 1 may be monocyclic or polycyclic, and examples thereof include cycloalkyl groups having 3 to 8 carbon atoms such as cyclopropyl, cyclopentyl and cyclohexyl.
• the aryl group represented by R 1 includes an aryl group having 6 to 18 carbon atoms such as a phenyl group.
• heteroaryl groups represented by R 1 include thiophenyl, furanyl, thiazolyl, pyrrolyl, benzothiophenyl, benzofuranyl, benzopyrrolyl, triazinyl, imidazolyl, benzimidazolyl, triazolyl, and thiadiazolyl groups. be done.
• Alkenyl groups represented by R 1 include alkenyl groups having 2 to 12 carbon atoms such as vinyl groups and allyl groups.
• the alkynyl group represented by R 1 includes alkynyl groups having 2 to 12 carbon atoms such as ethynyl group.
• At least one of R 1 preferably represents an aryl group or a heteroaryl group, and more preferably at least one represents a phenyl group or a thiophenyl group.
• R 1 may have a substituent, and examples of substituents include an alkyl group, a cycloalkyl group, an aryl group, an amino group, an amide group, a ureido group, a urethane group, a hydroxyl group, a carboxyl group, a halogen atom, alkoxy groups, thioether groups, acyl groups, acyloxy groups, alkoxycarbonyl groups, alkylsulfonyl groups, cyano groups, and nitro groups.
• the carbon number of the substituent is preferably 12 or less.
• the total number of carbon atoms contained in the 2n R 1 contained in the general formula (a) is, from the viewpoint of improving the reactivity of the deprotection reaction of the —(CR 1 R 1 )n- group by the action of an acid, It is preferably 2 or more, more preferably 4 or more, and even more preferably 6 or more. However, when X is a single bond, from the same point of view, the total number of carbon atoms contained in 2n R 1 contained in general formula (a) is 4 or more.
• R 1 has a substituent
• the carbon atoms contained in the substituent are also included in the total number.
• the total number of carbon atoms contained in 2n R 1 contained in the general formula (a) is from the viewpoint of suppressing the occurrence of residue defects in the pattern formed by the composition of the present invention. Therefore, it is preferably 12 or less, more preferably 8 or less, and even more preferably 6 or less.
• the total number of carbon atoms contained in 2n R 1 is preferably 2-8, more preferably 4-6.
• R 1 may combine with each other to form a ring. Specifically, two or more R 1 may be combined with each other to form a ring. In this case, it is preferable that two R1 's bonded to the same carbon atom bond to form a ring.
• Examples of the ring formed by bonding R 1 together include cycloalkanes such as cyclopentane and cyclohexane, and cycloalkenes such as cyclopentene and cyclohexene.
• cycloalkane some methylene groups forming a ring may be substituted with a heteroatom such as an oxygen atom or a sulfur atom.
• the total number of carbon atoms contained in R 1 bonded to each other is preferably 4-8, more preferably 4 or 5.
• the "total number of carbon atoms contained in R 1s bonded to each other" specifically means, for example, when two R 1s bonded to the same carbon atom are bonded to form cyclopentane has a total of four carbon atoms. Further, for example, when two R1 's bonded to the same carbon atom are bonded to form methylcyclopentane, the total number of carbon atoms is 5.
• A represents an aromatic ring group or an aromatic heterocyclic group.
• the aromatic ring group represented by A include aromatic ring groups having 6 to 18 carbon atoms such as benzene ring, naphthalene ring and anthracene ring.
• aromatic heterocyclic groups represented by A include thiophene ring, furan ring, thiazole ring, pyrrole ring, benzothiophene ring, benzofuran ring, benzopyrrole ring, triazine ring, imidazole ring, benzimidazole ring, triazole ring, and thiadiazole. ring and the like.
• A may have a substituent.
• Preferred substituents include, for example, alkyl groups, cycloalkyl groups, aryl groups, halogen atoms and the like.
• the number of carbon atoms in the substituent is preferably 8 or less.
• A preferably represents an aromatic ring group, more preferably a benzene ring group.
• X represents a single bond, an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a group formed by combining them.
• the alkylene group represented by X is preferably an alkylene group having 1 to 4 carbon atoms such as methylene group, ethylene group, propylene group and butylene group.
• an alkenylene group represented by X an alkenylene group having 2 to 4 carbon atoms such as a vinylene group is preferable.
• the alkynylene group represented by X is preferably an alkynylene group having 2 to 4 carbon atoms such as an ethynylene group.
• the general formula (a) also includes the ring formed by X, Y 1 and Y 2 and the ring A having the two common carbon atoms (C—C) in opposite positions.
• X may combine with the A ring to form a benzene ring.
• the repeating unit represented by the general formula (a) is a repeating unit represented by the following general formula (aa).
• R 1 , A, Y 1 , Y 2 , R 11 to R 13 , and n in general formula (aa) are R 1 , A, Y 1 , Y 2 , R 11 to R in general formula (a) is synonymous with 13 and n.
• X is preferably an alkylene group or a carbonyl group, more preferably a methylene group, an ethylene group, or a carbonyl group, and even more preferably a carbonyl group.
• Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom. At least one of Y 1 and Y 2 is preferably an oxygen atom, and both are more preferably oxygen atoms.
• R 11 to R 13 each independently represent a hydrogen atom, an organic group, or a halogen atom.
• the organic groups represented by R 11 to R 13 are, for example, alkyl groups, cycloalkyl groups, cyano groups or alkoxycarbonyl groups.
• alkyl groups represented by R 11 to R 13 include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, sec-butyl group, hexyl group, 2-ethylhexyl group, octyl group and dodecyl group. is preferably an alkyl group having 20 or less carbon atoms, more preferably an alkyl group having 8 or less carbon atoms, and still more preferably an alkyl group having 3 or less carbon atoms.
• the cycloalkyl groups represented by R 11 to R 13 may be monocyclic or polycyclic. Among them, monocyclic cycloalkyl groups having 3 to 8 carbon atoms such as cyclopropyl group, cyclopentyl group and cyclohexyl group are preferable.
• the alkyl group contained in the alkoxycarbonyl group represented by R 11 to R 13 is preferably the same as the alkyl group for R 11 to R 13 above.
• the alkylene group for R 12 when R 12 combines with the A ring to form a ring is preferably a group obtained by removing one arbitrary hydrogen atom from the alkyl group for R 11 to R 13 .
• Halogen atoms represented by R 11 to R 13 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, with a fluorine atom being preferred.
• substituents for the above groups include, for example, an alkyl group, a cycloalkyl group, an aryl group, an amino group, an amido group, a ureido group, a urethane group, a hydroxyl group, a carboxyl group, a halogen atom, an alkoxy group, a thioether group, and an acyl group. , an acyloxy group, an alkoxycarbonyl group, a cyano group, and a nitro group.
• the number of carbon atoms in the substituent is preferably 8 or less.
• R 11 to R 13 are each independently preferably a hydrogen atom or an alkyl group having 3 or less carbon atoms, more preferably a hydrogen atom.
• n represents an integer of 1-6. n is preferably an integer of 1 to 3, more preferably 1 or 2, and even more preferably 1.
• the repeating unit represented by general formula (a) is preferably a repeating unit represented by general formula (a-1) below.
• each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• a 1 represents a benzene ring group.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom. However, R 12 may combine with the benzene ring in general formula (a-1) to form a ring, in which case R 12 represents a single bond or an alkylene group.
• R 1 and R 11 to R 13 in general formula (a-1) have the same meanings as R 1 and R 11 to R 13 in general formula (a) above, and preferred examples are also the same.
• the repeating unit represented by general formula (a) is preferably a repeating unit represented by general formula (a-2) below.
• each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring. Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom. However, R 12 may combine with the benzene ring in general formula (a-2) to form a ring, in which case R 12 represents a single bond or an alkylene group.
• R 1 and R 11 to R 13 in general formula (a-2) have the same definitions as R 1 and R 11 to R 13 in general formula (a) above, and preferred examples are also the same.
• repeating unit represented by formula (a) Specific examples of the repeating unit represented by formula (a) are shown below, but the present invention is not limited thereto.
• structure of the raw material monomer of the repeating unit represented by the general formula (a) is shown.
• the content of the repeating unit (a) is preferably 15 mol% or more, more preferably 20 mol% or more, and still more preferably 30 mol% or more, relative to all repeating units in the resin (A).
• the upper limit is preferably 90 mol% or less, more preferably 80 mol% or less, still more preferably 70 mol% or less, and particularly 60 mol% or less, relative to all repeating units in the resin (A). preferable.
• the resin (A) may have a repeating unit having an acid-decomposable group in addition to the repeating unit (a) described above.
• a repeating unit having an acid-decomposable group a repeating unit having an acid-decomposable group containing an unsaturated bond is preferable in addition to the repeating unit having an acid-decomposable group described below.
• the acid-decomposable group preferably has a structure in which the polar group is protected with a group that is released by the action of an acid (leaving group).
• the polar group is preferably an alkali-soluble group such as a carboxyl group, a phenolic hydroxyl group, a fluorinated alcohol group, a sulfonic acid group, a phosphoric acid group, a sulfonamide group, a sulfonylimide group, (alkylsulfonyl)(alkylcarbonyl)methylene group, (alkylsulfonyl)(alkylcarbonyl)imide group, bis(alkylcarbonyl)methylene group, bis(alkylcarbonyl)imide group, bis(alkylsulfonyl)methylene group, bis(alkylsulfonyl)imide group, tris(alkylcarbonyl) Methylene groups, acidic groups such as tris(alkyl
• the polar group is preferably a carboxyl group, a phenolic hydroxyl group, a fluorinated alcohol group (preferably a hexafluoroisopropanol group), or a sulfonic acid group.
• Examples of groups that leave by the action of an acid include groups represented by formulas (Y1) to (Y4).
• Formula (Y1) -C(Rx 1 )(Rx 2 )(Rx 3 )
• Formula (Y3) —C(R 36 )(R 37 )(OR 38 )
• Rx 1 to Rx 3 each independently represent an alkyl group (linear or branched), a cycloalkyl group (monocyclic or polycyclic), an alkenyl group (linear or branched chain) or an aryl group (monocyclic or polycyclic).
• Rx 1 to Rx 3 are alkyl groups (linear or branched)
• at least two of Rx 1 to Rx 3 are preferably methyl groups.
• Rx 1 to Rx 3 preferably each independently represent a linear or branched alkyl group, and Rx 1 to Rx 3 each independently represent a linear alkyl group. is more preferred.
• Rx 1 to Rx 3 may combine to form a monocyclic or polycyclic ring.
• the alkyl groups of Rx 1 to Rx 3 are alkyl groups having 1 to 5 carbon atoms such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group and t-butyl group. preferable.
• the cycloalkyl groups represented by Rx 1 to Rx 3 include monocyclic cycloalkyl groups such as cyclopentyl and cyclohexyl groups, norbornyl, tetracyclodecanyl, tetracyclododecanyl, and adamantyl groups. is preferred.
• the aryl group represented by Rx 1 to Rx 3 is preferably an aryl group having 6 to 10 carbon atoms, such as phenyl group, naphthyl group and anthryl group.
• a vinyl group is preferable as the alkenyl group for Rx 1 to Rx 3 .
• the ring formed by combining two of Rx 1 to Rx 3 is preferably a cycloalkyl group.
• the cycloalkyl group formed by combining two of Rx 1 to Rx 3 includes a monocyclic cycloalkyl group such as a cyclopentyl group or a cyclohexyl group, a norbornyl group, a tetracyclodecanyl group, and a tetracyclododeca.
• a polycyclic cycloalkyl group such as a nyl group or an adamantyl group is preferable, and a monocyclic cycloalkyl group having 5 to 6 carbon atoms is more preferable.
• one of the methylene groups constituting the ring is a group containing a heteroatom such as an oxygen atom, a heteroatom such as a carbonyl group, or a vinylidene group. may be replaced with In these cycloalkyl groups, one or more ethylene groups constituting the cycloalkane ring may be replaced with a vinylene group.
• Rx 1 is a methyl group or an ethyl group
• Rx 2 and Rx 3 combine to form the above-described cycloalkyl group. is preferred.
• composition of the present invention is a resist composition for EUV exposure
• the ring formed by combining two atoms further has a fluorine atom or an iodine atom as a substituent.
• R 36 to R 38 each independently represent a hydrogen atom or a monovalent organic group.
• R 37 and R 38 may combine with each other to form a ring.
• Monovalent organic groups include alkyl groups, cycloalkyl groups, aryl groups, aralkyl groups, and alkenyl groups. It is also preferred that R 36 is a hydrogen atom.
• the alkyl group, cycloalkyl group, aryl group, and aralkyl group may contain a heteroatom such as an oxygen atom and/or a group containing a heteroatom such as a carbonyl group.
• one or more of the methylene groups may be replaced with a heteroatom such as an oxygen atom and/or a group containing a heteroatom such as a carbonyl group.
• R 38 may combine with another substituent of the main chain of the repeating unit to form a ring.
• the group formed by bonding R 38 and another substituent of the main chain of the repeating unit to each other is preferably an alkylene group such as a methylene group.
• monovalent organic groups represented by R 36 to R 38 and R 37 and R 38 are formed by binding to each other.
• the ring also preferably has a fluorine atom or an iodine atom as a substituent.
• L 1 and L 2 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a group combining these (e.g., a group combining an alkyl group and an aryl group).
• M represents a single bond or a divalent linking group.
• Q is an alkyl group optionally containing a heteroatom, a cycloalkyl group optionally containing a heteroatom, an aryl group optionally containing a heteroatom, an amino group, an ammonium group, a mercapto group, a cyano group, an aldehyde group, or a group combining these (for example, a group combining an alkyl group and a cycloalkyl group).
• one of the methylene groups may be replaced by a heteroatom such as an oxygen atom or a heteroatom-containing group such as a carbonyl group.
• L 1 and L 2 is preferably a hydrogen atom, and the other is preferably an alkyl group, a cycloalkyl group, an aryl group, or a combination of an alkylene group and an aryl group. At least two of Q, M, and L1 may combine to form a ring (preferably a 5- or 6-membered ring).
• L2 is preferably a secondary or tertiary alkyl group, more preferably a tertiary alkyl group.
• Secondary alkyl groups include isopropyl, cyclohexyl, and norbornyl groups, and tertiary alkyl groups include tert-butyl and adamantane groups.
• the Tg (glass transition temperature) and the activation energy are increased, so that the film strength can be ensured and fogging can be suppressed.
• the alkyl group, cycloalkyl group, aryl group, and group combining these represented by L 1 and L 2 are further It is also preferable to have a fluorine atom or an iodine atom as a substituent.
• the alkyl group, cycloalkyl group, aryl group, and aralkyl group preferably contain a heteroatom such as an oxygen atom in addition to the fluorine atom and the iodine atom.
• one of the methylene groups is replaced with a heteroatom such as an oxygen atom, or a group containing a heteroatom such as a carbonyl group.
• composition of the present invention when the composition of the present invention is a resist composition for EUV exposure, an alkyl group optionally containing a heteroatom represented by Q, a cycloalkyl group optionally containing a heteroatom, or a heteroatom is In the aryl group, amino group, ammonium group, mercapto group, cyano group, aldehyde group, and groups in which these groups may be combined, the heteroatom is selected from the group consisting of a fluorine atom, an iodine atom and an oxygen atom. It is also preferred that the heteroatom is
• Ar represents an aromatic ring group.
• Rn represents an alkyl group, a cycloalkyl group, or an aryl group.
• Rn and Ar may combine with each other to form a non-aromatic ring.
• Ar is preferably an aryl group.
• the aromatic ring group represented by Ar and the alkyl group, cycloalkyl group and aryl group represented by Rn are substituents It is also preferable to have a fluorine atom or an iodine atom as.
• the ring member atoms adjacent to the ring member atoms directly bonded to the polar group (or residue thereof) do not have halogen atoms such as fluorine atoms as substituents.
• Groups that can be eliminated by the action of an acid also include a 2-cyclopentenyl group having a substituent (such as an alkyl group) such as a 3-methyl-2-cyclopentenyl group, and a 1,1,4,4 A cyclohexyl group having a substituent (such as an alkyl group) such as a -tetramethylcyclohexyl group may also be used.
• repeating unit having an acid-decomposable group a repeating unit represented by formula (A) is also preferred.
• L 1 represents a divalent linking group optionally having a fluorine atom or an iodine atom
• R 1 is a hydrogen atom, a fluorine atom, an iodine atom, an alkyl group optionally having a fluorine atom or an iodine atom , or represents an aryl group optionally having a fluorine atom or an iodine atom
• R 2 represents a leaving group optionally having a fluorine atom or an iodine atom which is eliminated by the action of an acid.
• at least one of L 1 , R 1 and R 2 has a fluorine atom or an iodine atom.
• the divalent linking group optionally having a fluorine atom or an iodine atom represented by L 1 includes -CO-, -O-, -S-, -SO-, -SO 2 -, fluorine atom or a hydrocarbon group optionally having an iodine atom (eg, an alkylene group, a cycloalkylene group, an alkenylene group, an arylene group, etc.), and a linking group in which a plurality of these are linked.
• L 1 is preferably -CO-, an arylene group, or an -arylene group - an alkylene group having a fluorine atom or an iodine atom -, and -CO- or an -arylene group - a fluorine atom or an iodine atom.
• An alkylene group with - is more preferable.
• a phenylene group is preferred as the arylene group.
• Alkylene groups may be linear or branched. Although the number of carbon atoms in the alkylene group is not particularly limited, it is preferably 1-10, more preferably 1-3.
• the total number of fluorine atoms and iodine atoms contained in the alkylene group having fluorine atoms or iodine atoms is not particularly limited, but is preferably 2 or more, more preferably 2 to 10, and even more preferably 3 to 6.
• the alkyl group represented by R 1 may be linear or branched. Although the number of carbon atoms in the alkyl group is not particularly limited, it is preferably 1-10, more preferably 1-3. The total number of fluorine atoms and iodine atoms contained in the alkyl group having a fluorine atom or an iodine atom represented by R 1 is not particularly limited, but is preferably 1 or more, more preferably 1 to 5, and 1 to 3. More preferred.
• the alkyl group represented by R 1 may contain a heteroatom such as an oxygen atom other than the halogen atom.
• the leaving group optionally having a fluorine atom or an iodine atom represented by R 2 is represented by the above formulas (Y1) to (Y4) and having a fluorine atom or an iodine atom. groups.
• repeating unit having an acid-decomposable group a repeating unit represented by formula (AI) is also preferred.
• Xa 1 represents a hydrogen atom or an optionally substituted alkyl group.
• T represents a single bond or a divalent linking group.
• Rx 1 to Rx 3 each independently represent an alkyl group (linear or branched), a cycloalkyl group (monocyclic or polycyclic), an alkenyl group (linear or branched), or an aryl ( monocyclic or polycyclic) group. However, when all of Rx 1 to Rx 3 are alkyl groups (linear or branched), at least two of Rx 1 to Rx 3 are preferably methyl groups. Two of Rx 1 to Rx 3 may combine to form a monocyclic or polycyclic ring (such as a monocyclic or polycyclic cycloalkyl group).
• Examples of the optionally substituted alkyl group represented by Xa 1 include a methyl group and a group represented by -CH 2 -R 11 .
• R 11 represents a halogen atom (such as a fluorine atom), a hydroxyl group, or a monovalent organic group.
• Examples of the monovalent organic group represented by R 11 include an alkyl group having 5 or less carbon atoms which may be substituted with a halogen atom, an acyl group having 5 or less carbon atoms which may be substituted with a halogen atom, and an alkoxy group having 5 or less carbon atoms which may be substituted with a halogen atom, preferably an alkyl group having 3 or less carbon atoms, and more preferably a methyl group.
• Xa 1 is preferably a hydrogen atom, a methyl group, a trifluoromethyl group, or a hydroxymethyl group.
• the divalent linking group for T includes an alkylene group, an aromatic ring group, a --COO--Rt-- group, and a --O--Rt-- group.
• Rt represents an alkylene group or a cycloalkylene group.
• T is preferably a single bond or a -COO-Rt- group.
• Rt is preferably an alkylene group having 1 to 5 carbon atoms, a -CH 2 - group, a -(CH 2 ) 2 - group, or a -(CH 2 ) 3 - groups are more preferred.
• the alkyl groups of Rx 1 to Rx 3 include alkyl groups having 1 to 4 carbon atoms such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group and t-butyl group. preferable.
• Cycloalkyl groups of Rx 1 to Rx 3 include monocyclic cycloalkyl groups such as cyclopentyl group and cyclohexyl group, norbornyl group, tetracyclodecanyl group, tetracyclododecanyl group, and adamantyl group. is preferred.
• the aryl group represented by Rx 1 to Rx 3 is preferably an aryl group having 6 to 10 carbon atoms, such as phenyl group, naphthyl group and anthryl group.
• a vinyl group is preferable as the alkenyl group for Rx 1 to Rx 3 .
• the cycloalkyl group formed by combining two of Rx 1 to Rx 3 is preferably a monocyclic cycloalkyl group such as a cyclopentyl group and a cyclohexyl group.
• Polycyclic cycloalkyl groups such as a norbornyl group, a tetracyclodecanyl group, a tetracyclododecanyl group, and an adamantyl group are also preferred. Among them, monocyclic cycloalkyl groups having 5 to 6 carbon atoms are preferred.
• a cycloalkyl group formed by combining two of Rx 1 to Rx 3 is, for example, a group in which one of the methylene groups constituting the ring contains a heteroatom such as an oxygen atom, a heteroatom such as a carbonyl group, or It may be substituted with a vinylidene group.
• Rx 1 is a methyl group or an ethyl group
• Rx 2 and Rx 3 are preferably combined to form the above-mentioned cycloalkyl group.
• substituents include an alkyl group (1 to 4 carbon atoms), a halogen atom, a hydroxyl group, an alkoxy group (1 to 4 carbon atoms), a carboxyl group, and an alkoxycarbonyl group. (2 to 6 carbon atoms).
• the number of carbon atoms in the substituent is preferably 8 or less.
• the repeating unit represented by the formula (AI) includes an acid-decomposable (meth)acrylic acid tertiary alkyl ester-based repeating unit (Xa 1 represents a hydrogen atom or a methyl group, and T represents a single bond. ) is preferred.
• repeating units having an acid-decomposable group are shown below, but are not limited thereto.
• Xa 1 represents H, CH 3 , CF 3 or CH 2 OH
• Rxa and Rxb each independently represent a linear or branched alkyl group having 1 to 5 carbon atoms.
• Resin (A) may have a repeating unit having an acid-decomposable group containing an unsaturated bond as the repeating unit having an acid-decomposable group.
• a repeating unit represented by formula (B) is preferable.
• Xb represents a hydrogen atom, a halogen atom, or an optionally substituted alkyl group.
• L represents a single bond or a divalent linking group which may have a substituent.
• Ry 1 to Ry 3 each independently represent a linear or branched alkyl group, a monocyclic or polycyclic cycloalkyl group, an alkenyl group, an alkynyl group, or a monocyclic or polycyclic aryl group . However, at least one of Ry 1 to Ry 3 represents an alkenyl group, an alkynyl group, a monocyclic or polycyclic cycloalkenyl group, or a monocyclic or polycyclic aryl group. Two of Ry 1 to Ry 3 may combine to form a monocyclic or polycyclic ring (a monocyclic or polycyclic cycloalkyl group, cycloalkenyl group, etc.).
• the optionally substituted alkyl group represented by Xb includes, for example, a methyl group and a group represented by —CH 2 —R 11 .
• R 11 represents a halogen atom (such as a fluorine atom), a hydroxyl group, or a monovalent organic group, for example, an alkyl group having 5 or less carbon atoms which may be substituted with a halogen atom, and an alkoxy group having 5 or less carbon atoms which may be substituted with a halogen atom, preferably an alkyl group having 3 or less carbon atoms, and more preferably a methyl group.
• Xb is preferably a hydrogen atom, a fluorine atom, a methyl group, a trifluoromethyl group, or a hydroxymethyl group.
• the divalent linking group of L includes -Rt- group, -CO- group, -COO-Rt- group, -COO-Rt-CO- group, -Rt-CO- group, and -O-Rt- groups.
• Rt represents an alkylene group, a cycloalkylene group, or an aromatic ring group, preferably an aromatic ring group.
• L is preferably -Rt-, -CO-, -COO-Rt-CO- or -Rt-CO-.
• Rt may have substituents such as halogen atoms, hydroxyl groups, and alkoxy groups.
• the alkyl groups represented by Ry 1 to Ry 3 include alkyl groups having 1 to 4 carbon atoms such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group and t-butyl group. preferable.
• Cycloalkyl groups represented by Ry 1 to Ry 3 include monocyclic cycloalkyl groups such as cyclopentyl group and cyclohexyl group, norbornyl group, tetracyclodecanyl group, tetracyclododecanyl group and adamantyl group. Polycyclic cycloalkyl groups are preferred.
• the aryl group represented by Ry 1 to Ry 3 is preferably an aryl group having 6 to 10 carbon atoms, such as phenyl group, naphthyl group and anthryl group.
• a vinyl group is preferable as the alkenyl group for Ry 1 to Ry 3 .
• An ethynyl group is preferred as the alkynyl group for Ry 1 to Ry 3 .
• Cycloalkenyl groups represented by Ry 1 to Ry 3 are preferably monocyclic cycloalkyl groups such as cyclopentyl groups and cyclohexyl groups, which partially contain a double bond.
• the cycloalkyl group formed by combining two of Ry 1 to Ry 3 includes a monocyclic cycloalkyl group such as a cyclopentyl group and a cyclohexyl group, a norbornyl group, a tetracyclodecanyl group, and a tetracyclododeca.
• Polycyclic cycloalkyl groups such as a nyl group and an adamantyl group are preferred. Among them, a monocyclic cycloalkyl group having 5 to 6 carbon atoms is more preferable.
• a cycloalkyl group formed by combining two of Ry 1 to Ry 3 or a cycloalkenyl group for example, one of the methylene groups constituting the ring is a hetero atom such as an oxygen atom, a carbonyl group, or —SO 2 It may be substituted with a group containing a heteroatom such as a - group and a -SO 3 - group, a vinylidene group, or a combination thereof.
• one or more ethylene groups constituting the cycloalkane ring or cycloalkene ring may be replaced with a vinylene group.
• Ry 1 is a methyl group, an ethyl group, a vinyl group, an allyl group, or an aryl group
• Ry 2 and Ry 3 combine to form the above-mentioned cycloalkyl
• a preferred embodiment forms a group or a cycloalkenyl group.
• substituents include an alkyl group (1 to 4 carbon atoms), a halogen atom, a hydroxyl group, an alkoxy group (1 to 4 carbon atoms), a carboxyl group, and an alkoxycarbonyl group. (2 to 6 carbon atoms).
• the number of carbon atoms in the substituent is preferably 8 or less.
• the repeating unit represented by the formula (B) is preferably an acid-decomposable (meth)acrylic acid tertiary ester-based repeating unit (Xb represents a hydrogen atom or a methyl group, and L represents a —CO— group.
• repeating unit represented acid-decomposable hydroxystyrene tertiary alkyl ether-based repeating unit (repeating unit in which Xb represents a hydrogen atom or a methyl group and L represents a phenyl group), acid-decomposable styrene carboxylic acid tertiary ester It is a repeating unit (a repeating unit in which Xb represents a hydrogen atom or a methyl group and L represents a -Rt-CO- group (Rt is an aromatic group)).
• the content of the repeating unit having an acid-decomposable group containing an unsaturated bond is preferably 15 mol% or more, more preferably 20 mol% or more, and 30 mol% or more, based on the total repeating units in the resin (A). is more preferred.
• the upper limit thereof is preferably 80 mol % or less, more preferably 70 mol % or less, and even more preferably 60 mol % or less, based on all repeating units in the resin (A).
• repeating units having an acid-decomposable group containing an unsaturated bond are shown below, but are not limited thereto.
• Xb and L 1 represent any of the substituents and linking groups described above
• Ar represents an aromatic group
• R represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group.
• a monocyclic or polycyclic aryl group is represented, and Q is a heteroatom such as an oxygen atom, a carbonyl group, a heteroatom-containing group such as a —SO 2 — group and a —SO 3 — group, a vinylidene group, or any of these represents a combination, and n, m and l represent integers of 0 or more.
• the content of repeating units having an acid-decomposable group other than the repeating unit (a) is the content of repeating units having an acid-decomposable group including the repeating unit (a), which is the total number of repeating units in the resin (A). 15 mol % or more is preferable, 20 mol % or more is more preferable, and 30 mol % or more is still more preferable with respect to the unit.
• the upper limit is preferably 90 mol% or less, more preferably 80 mol% or less, still more preferably 70 mol% or less, and particularly 60 mol% or less, relative to all repeating units in the resin (A). preferable.
• the resin (A) may contain at least one repeating unit selected from the group consisting of Group A below and/or at least one repeating unit selected from the group consisting of Group B below. good.
• Group A A group consisting of the following repeating units (20) to (25).
• a repeating unit having an acid group which will be described later
• (23) a repeating unit having a photoacid-generating group which will be described later
• the repeating units represented by formulas (A) to (E), which will be described later, are (25) reducing the mobility of the main chain corresponds to a repeating unit for Group B: A group consisting of the following repeating units (30) to (32).
• the resin (A) preferably has an acid group, and preferably contains a repeating unit having an acid group, as described later.
• the definition of the acid group will be explained later along with preferred embodiments of repeating units having an acid group.
• the resin (A) may have at least one type of repeating unit selected from the group consisting of the A group.
• the resin (A) has at least one repeating unit selected from the group consisting of Group A above. is preferred.
• Resin (A) may contain at least one of a fluorine atom and an iodine atom.
• the resin (A) preferably contains at least one of a fluorine atom and an iodine atom.
• the resin (A) may have one repeating unit containing both a fluorine atom and an iodine atom, and the resin (A) It may contain two types of a repeating unit containing a fluorine atom and a repeating unit containing an iodine atom.
• Resin (A) may have a repeating unit having an aromatic group.
• the composition of the present invention is used as an actinic ray-sensitive or radiation-sensitive resin composition for EUV exposure, it is also preferred that the resin (A) has a repeating unit having an aromatic group.
• the resin (A) may have at least one type of repeating unit selected from the group consisting of Group B above.
• the resin (A) may have at least one repeating unit selected from the group consisting of Group B above. preferable.
• the resin (A) preferably contains neither fluorine atoms nor silicon atoms.
• Resin (A) may have a repeating unit having an acid group.
• an acid group having a pKa of 13 or less is preferable.
• the acid dissociation constant of the acid group is preferably 13 or less, more preferably 3-13, even more preferably 5-10.
• the content of the acid group in the resin (A) is not particularly limited, but is often 0.2 to 6.0 mmol/g. Among them, 0.8 to 6.0 mmol/g is preferable, 1.2 to 5.0 mmol/g is more preferable, and 1.6 to 4.0 mmol/g is even more preferable.
• the acid group is preferably, for example, a carboxyl group, a phenolic hydroxyl group, a fluoroalcohol group (preferably a hexafluoroisopropanol group), a sulfonic acid group, a sulfonamide group, or an isopropanol group.
• a fluoroalcohol group preferably a hexafluoroisopropanol group
• a sulfonic acid group preferably a sulfonamide group
• an isopropanol group preferably, for example, a carboxyl group, a phenolic hydroxyl group, a fluoroalcohol group (preferably a hexafluoroisopropanol group), a sulfonic acid group, a sulfonamide group, or an isopropanol group.
• one or more (preferably 1 to 2) fluorine atoms may be substituted with a group other than a fluor
• the acid group is -C(CF 3 )(OH)-CF 2 - thus formed.
• one or more of the fluorine atoms may be substituted with a group other than a fluorine atom to form a ring containing -C(CF 3 )(OH)-CF 2 -.
• the repeating unit having an acid group is different from the repeating unit having a structure in which the polar group is protected by a group that leaves under the action of an acid, and the repeating unit having a lactone group, a sultone group, or a carbonate group, which will be described later. It is preferably a repeating unit.
• a repeating unit having an acid group may have a fluorine atom or an iodine atom.
• repeating units having an acid group include the following repeating units.
• repeating unit having an acid group a repeating unit represented by the following general formula (c) (repeating unit (c)) is also preferable. It is preferable that the resin (A) further contains a repeating unit (c) represented by the following general formula (c).
• R 61 to R 63 each independently represent a hydrogen atom, an organic group or a halogen atom.
• R 62 may combine with Ar to form a ring, in which case R 62 represents a single bond or an alkylene group.
• L represents a single bond or a divalent linking group.
• Ar represents a (k+1)-valent aromatic ring group, and when combined with R 62 to form a ring, represents a (k+2)-valent aromatic ring group.
• k represents an integer of 1 to 5;
• R 61 to R 63 each represent a hydrogen atom, an organic group or a halogen atom.
• the organic group represented by R 61 to R 63 is, for example, an alkyl group, a cycloalkyl group, a cyano group or an alkoxycarbonyl group.
• alkyl groups represented by R 61 to R 63 include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, sec-butyl group, hexyl group, 2-ethylhexyl group, octyl group and dodecyl group. is preferably an alkyl group having 20 or less carbon atoms, more preferably an alkyl group having 8 or less carbon atoms, and still more preferably an alkyl group having 3 or less carbon atoms.
• the cycloalkyl groups represented by R 61 to R 63 may be monocyclic or polycyclic. Among them, monocyclic cycloalkyl groups having 3 to 8 carbon atoms such as cyclopropyl group, cyclopentyl group and cyclohexyl group are preferable.
• the alkyl group contained in the alkoxycarbonyl group represented by R 61 to R 63 is preferably the same as the alkyl group for R 61 to R 63 above.
• the alkylene group for R 62 is preferably a group obtained by removing one arbitrary hydrogen atom from the alkyl group for R 61 to R 63 above.
• Halogen atoms represented by R 61 to R 63 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, with a fluorine atom being preferred.
• substituents for the above groups include, for example, an alkyl group, a cycloalkyl group, an aryl group, an amino group, an amido group, a ureido group, a urethane group, a hydroxyl group, a carboxyl group, a halogen atom, an alkoxy group, a thioether group, and an acyl group. , an acyloxy group, an alkoxycarbonyl group, a cyano group, and a nitro group.
• the number of carbon atoms in the substituent is preferably 8 or less.
• Ar represents a (k+1)-valent aromatic ring group.
• the divalent aromatic ring group when k is 1 may have a substituent, for example, a phenylene group, a tolylene group, a naphthylene group, and an arylene group having 6 to 18 carbon atoms such as an anthracenylene group.
• a hetero ring such as a thiophene ring, a furan ring, a pyrrole ring, a benzothiophene ring, a benzofuran ring, a benzopyrrole ring, a triazine ring, an imidazole ring, a benzimidazole ring, a triazole ring, a thiadiazole ring, and a thiazole ring
• a cyclic group is preferred.
• Specific examples of the (k+1)-valent aromatic ring group when k is an integer of 2 or more include the above specific examples of the divalent aromatic ring group, with (k-1) any hydrogen atoms removed.
• a group formed by The (k+1)-valent aromatic ring group may further have a substituent.
• substituents that the (k+1)-valent aromatic ring group may have include halogen atoms, alkyl groups, cycloalkyl groups, aryl groups, alkenyl groups, aralkyl groups, alkoxy groups, alkylcarbonyloxy groups, and alkylsulfonyloxy groups. , an alkyloxycarbonyl group or an aryloxycarbonyl group.
• Ar is preferably an aromatic ring group having 6 to 18 carbon atoms, more preferably a benzene ring group, a naphthalene ring group, or a biphenylene ring group.
• the repeating unit represented by general formula (c) preferably has a hydroxystyrene structure. That is, Ar is preferably a benzene ring group, more preferably a phenylene group (a divalent benzene ring group).
• L represents a single bond or a divalent linking group.
• the divalent linking group represented by L includes *-X 4 -L 4 -**.
• X 4 represents a single bond, -COO- or -CONR 64 -
• R 64 represents a hydrogen atom or an alkyl group.
• L4 represents a single bond or an alkylene group. * is a bond with a carbon atom of the main chain in general formula (c), and ** is a bond with Ar.
• the alkyl group for R 64 in —CONR 64 — (R 64 represents a hydrogen atom or an alkyl group) represented by X 4 includes methyl, ethyl, propyl, isopropyl, n-butyl, sec -Butyl group, hexyl group, 2-ethylhexyl group, octyl group, dodecyl group and other alkyl groups having 20 or less carbon atoms, preferably alkyl groups having 8 or less carbon atoms.
• X 4 is preferably a single bond, -COO- or -CONH-, more preferably a single bond or -COO-.
• the alkylene group for L4 is preferably an alkylene group having 1 to 8 carbon atoms such as a methylene group, ethylene group, propylene group, butylene group, hexylene group, and octylene group.
• L is preferably a single bond, -COO- or -CONH-, more preferably a single bond.
• k represents an integer of 1-5. k is preferably an integer of 1 to 3, more preferably 1 or 2, and even more preferably 1.
• repeating units having an acid group examples include a and a.
• R represents a hydrogen atom or a methyl group
• a represents an integer of 1-3.
• the content of repeating units having an acid group is preferably 10 mol% or more, more preferably 15 mol% or more, relative to all repeating units in the resin (A). Moreover, the upper limit thereof is preferably 70 mol % or less, more preferably 65 mol % or less, and still more preferably 60 mol % or less, based on all repeating units in the resin (A).
• the resin (A) has neither an acid-decomposable group nor an acid group, apart from the above-described ⁇ repeating unit having an acid-decomposable group> and ⁇ repeating unit having an acid group>, and contains a fluorine atom and a bromine atom.
• it may have a repeating unit having an iodine atom (hereinafter also referred to as unit X).
• the ⁇ repeating unit having neither an acid-decomposable group nor an acid group and having a fluorine atom, a bromine atom, or an iodine atom> referred to here is a ⁇ repeating unit having a lactone group, a sultone group, or a carbonate group> described later.
• ⁇ repeating unit having photoacid-generating group> is a ⁇ repeating unit having photoacid-generating group>.
• a repeating unit represented by formula (C) is preferable.
• L5 represents a single bond or an ester group.
• R9 represents a hydrogen atom or an alkyl group optionally having a fluorine atom or an iodine atom.
• R 10 may have a hydrogen atom, an alkyl group optionally having a fluorine atom or an iodine atom, a cycloalkyl group optionally having a fluorine atom or an iodine atom, a fluorine atom or an iodine atom represents an aryl group or a group combining these;
• repeating units having a fluorine atom or an iodine atom are shown below.
• the content of the unit X is preferably 0 mol% or more, more preferably 5 mol% or more, and still more preferably 10 mol% or more, relative to all repeating units in the resin (A). Moreover, the upper limit thereof is preferably 50 mol % or less, more preferably 45 mol % or less, and still more preferably 40 mol % or less, relative to all repeating units in the resin (A).
• the total content of repeating units containing at least one of a fluorine atom, a bromine atom and an iodine atom is preferably 10 mol% or more with respect to all repeating units of the resin (A). , more preferably 20 mol % or more, still more preferably 30 mol % or more, and particularly preferably 40 mol % or more.
• the upper limit is not particularly limited, it is, for example, 100 mol % or less with respect to all repeating units of the resin (A).
• the repeating unit containing at least one of a fluorine atom, a bromine atom and an iodine atom includes, for example, a repeating unit having a fluorine atom, a bromine atom or an iodine atom and having an acid-decomposable group, a fluorine atom, a bromine repeating units having an acid group, and repeating units having a fluorine atom, a bromine atom, or an iodine atom.
• Resin (A) may have a repeating unit (hereinafter also referred to as “unit Y”) having at least one selected from the group consisting of a lactone group, a sultone group and a carbonate group. It is also preferable that the unit Y does not have a hydroxyl group and an acid group such as a hexafluoropropanol group.
• the lactone group or sultone group may have a lactone structure or sultone structure.
• the lactone structure or sultone structure is preferably a 5- to 7-membered ring lactone structure or a 5- to 7-membered ring sultone structure.
• the resin (A) has a lactone structure represented by any one of the following formulas (LC1-1) to (LC1-21), or any one of the following formulas (SL1-1) to (SL1-3). It preferably has a repeating unit having a lactone group or a sultone group obtained by removing one or more hydrogen atoms from a ring member atom of a sultone structure, and the lactone group or sultone group may be directly bonded to the main chain.
• ring member atoms of a lactone group or a sultone group may constitute the main chain of resin (A).
• the lactone structure or sultone structure may have a substituent (Rb 2 ).
• Preferred substituents (Rb 2 ) include alkyl groups having 1 to 8 carbon atoms, cycloalkyl groups having 4 to 7 carbon atoms, alkoxy groups having 1 to 8 carbon atoms, alkoxycarbonyl groups having 1 to 8 carbon atoms, and carboxyl groups. , halogen atoms, cyano groups, and acid-labile groups.
• n2 represents an integer of 0-4. When n2 is 2 or more, multiple Rb 2 may be different, and multiple Rb 2 may combine to form a ring.
• Rb 0 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 4 carbon atoms. Preferred substituents that the alkyl group of Rb 0 may have include a hydroxyl group and a halogen atom.
• a halogen atom for Rb 0 includes a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
• Rb 0 is preferably a hydrogen atom or a methyl group.
• Ab is a single bond, an alkylene group, a divalent linking group having a monocyclic or polycyclic alicyclic hydrocarbon structure, an ether group, an ester group, a carbonyl group, a carboxyl group, or a combination of these divalent linkages represents a group.
• Ab is preferably a single bond or a linking group represented by -Ab 1 -CO 2 -.
• Ab 1 is a linear or branched alkylene group or a monocyclic or polycyclic cycloalkylene group, preferably a methylene group, ethylene group, cyclohexylene group, adamantylene group or norbornylene group.
• V is a group obtained by removing one hydrogen atom from a ring member atom of a lactone structure represented by any one of formulas (LC1-1) to (LC1-21), or formulas (SL1-1) to (SL1- 3) represents a group obtained by removing one hydrogen atom from a ring member atom of the sultone structure represented by any one of 3).
• any optical isomer may be used. Moreover, one optical isomer may be used alone, or a plurality of optical isomers may be mixed and used. When one kind of optical isomer is mainly used, its optical purity (ee) is preferably 90 or more, more preferably 95 or more.
• a cyclic carbonate group is preferred.
• a repeating unit having a cyclic carbonate group a repeating unit represented by the following formula (A-1) is preferable.
• R A 1 represents a hydrogen atom, a halogen atom, or a monovalent organic group (preferably a methyl group).
• n represents an integer of 0 or more.
• R A 2 represents a substituent. When n is 2 or more, a plurality of R A 2 may be the same or different.
• A represents a single bond or a divalent linking group.
• the divalent linking group includes an alkylene group, a divalent linking group having a monocyclic or polycyclic alicyclic hydrocarbon structure, an ether group, an ester group, a carbonyl group, a carboxyl group, or a combination of these.
• a valent linking group is preferred.
• Z represents an atomic group forming a monocyclic or polycyclic ring together with the group represented by -O-CO-O- in the formula.
• Rx represents a hydrogen atom, -CH 3 , -CH 2 OH or -CF 3 .
• the content of the unit Y is preferably 1 mol% or more, more preferably 10 mol% or more, relative to all repeating units in the resin (A).
• the upper limit is preferably 85 mol% or less, more preferably 80 mol% or less, still more preferably 70 mol% or less, and particularly 60 mol% or less, relative to all repeating units in the resin (A). preferable.
• the resin (A) may have, as a repeating unit other than the above, a repeating unit having a group that generates an acid upon exposure to actinic rays or radiation (hereinafter also referred to as a "photoacid-generating group").
• Repeating units having a photoacid-generating group include repeating units represented by formula (4).
• R41 represents a hydrogen atom or a methyl group.
• L41 represents a single bond or a divalent linking group.
• L42 represents a divalent linking group.
• R40 represents a structural site that is decomposed by exposure to actinic rays or radiation to generate an acid in the side chain. Examples of repeating units having a photoacid-generating group are shown below.
• repeating unit represented by formula (4) includes, for example, repeating units described in paragraphs [0094] to [0105] of JP-A-2014-041327, and International Publication No. 2018/193954. Examples include repeating units described in paragraph [0094].
• the content of the repeating unit having a photoacid-generating group is preferably 1 mol % or more, more preferably 5 mol % or more, relative to all repeating units in the resin (A). Moreover, the upper limit thereof is preferably 40 mol % or less, more preferably 35 mol % or less, and still more preferably 30 mol % or less, based on all repeating units in the resin (A).
• Resin (A) may have a repeating unit represented by the following formula (V-1) or the following formula (V-2).
• Repeating units represented by the following formulas (V-1) and (V-2) below are preferably different repeating units from the repeating units described above.
• R 6 and R 7 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group, an acyloxy group, a cyano group, a nitro group, an amino group, a halogen atom, an ester group (-OCOR or -COOR: R is the number of carbon atoms; 1 to 6 alkyl groups or fluorinated alkyl groups), or a carboxyl group.
• the alkyl group is preferably a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms.
• n3 represents an integer of 0-6.
• n4 represents an integer of 0-4.
• X4 is a methylene group, an oxygen atom, or a sulfur atom.
• the repeating units represented by formula (V-1) or (V-2) are exemplified below. Examples of the repeating unit represented by formula (V-1) or (V-2) include repeating units described in paragraph [0100] of WO 2018/193954.
• the resin (A) preferably has a high glass transition temperature (Tg) from the viewpoint of suppressing excessive diffusion of generated acid or pattern collapse during development.
• Tg is preferably greater than 90°C, more preferably greater than 100°C, even more preferably greater than 110°C, and particularly preferably greater than 125°C.
• the Tg is preferably 400° C. or less, more preferably 350° C. or less, from the viewpoint of excellent dissolution rate in the developer.
• Tg of repeating unit is calculated by the following method.
• the Tg of a homopolymer consisting only of each repeating unit contained in the polymer is calculated by the Bicerano method.
• the mass ratio (%) of each repeating unit to all repeating units in the polymer is calculated.
• the Fox formula (described in Materials Letters 62 (2008) 3152, etc.) is used to calculate the Tg at each mass ratio, and these are totaled to obtain the Tg (°C) of the polymer.
• the Bicerano method is described in Prediction of polymer properties, Marcel Dekker Inc, New York (1993). Calculation of Tg by the Bicerano method can be performed using a polymer physical property estimation software MDL Polymer (MDL Information Systems, Inc.).
• Methods for reducing the mobility of the main chain of the resin (A) include the following methods (a) to (e).
• (a) introduction of bulky substituents into the main chain (b) introduction of multiple substituents into the main chain (c) introduction of substituents that induce interaction between the resin (A) into the vicinity of the main chain ( d) Main Chain Formation in Cyclic Structure (e) Linking of Cyclic Structure to Main Chain
• the resin (A) preferably has a repeating unit exhibiting a homopolymer Tg of 130° C. or higher.
• the type of repeating unit exhibiting a homopolymer Tg of 130° C. or higher is not particularly limited as long as it is a repeating unit having a homopolymer Tg of 130° C. or higher as calculated by the Bicerano method.
• the homopolymers correspond to repeating units exhibiting a homopolymer Tg of 130° C. or higher.
• a specific example of means for achieving the above (a) is a method of introducing a repeating unit represented by the formula (A) into the resin (A).
• RA represents a group containing a polycyclic structure.
• R x represents a hydrogen atom, a methyl group, or an ethyl group.
• a group containing a polycyclic structure is a group containing multiple ring structures, and the multiple ring structures may or may not be condensed.
• Specific examples of the repeating unit represented by formula (A) include those described in paragraphs [0107] to [0119] of WO2018/193954.
• a specific example of means for achieving the above (b) is a method of introducing a repeating unit represented by the formula (B) into the resin (A).
• R b1 to R b4 each independently represent a hydrogen atom or an organic group, and at least two or more of R b1 to R b4 represent an organic group.
• the type of other organic group is not particularly limited.
• at least two of the organic groups have three or more constituent atoms excluding hydrogen atoms. is a substituent.
• Specific examples of the repeating unit represented by formula (B) include those described in paragraphs [0113] to [0115] of WO2018/193954.
• a specific example of means for achieving the above (c) is a method of introducing a repeating unit represented by the formula (C) into the resin (A).
• R c1 to R c4 each independently represent a hydrogen atom or an organic group, and at least one of R c1 to R c4 is hydrogen bonding hydrogen within 3 atoms from the main chain carbon It is a group containing atoms. Above all, it is preferable to have a hydrogen-bonding hydrogen atom within 2 atoms (closer to the main chain side) in order to induce interaction between the main chains of the resin (A).
• Specific examples of the repeating unit represented by formula (C) include those described in paragraphs [0119] to [0121] of WO2018/193954.
• a specific example of means for achieving (d) above is a method of introducing a repeating unit represented by the formula (D) into the resin (A).
• Cyclic represents a group forming a main chain with a cyclic structure.
• the number of constituent atoms of the ring is not particularly limited.
• Specific examples of the repeating unit represented by formula (D) include those described in paragraphs [0126] to [0127] of WO2018/193954.
• a specific example of means for achieving (e) above is a method of introducing a repeating unit represented by formula (E) into the resin (A).
• each Re independently represents a hydrogen atom or an organic group.
• organic groups include alkyl groups, cycloalkyl groups, aryl groups, aralkyl groups, and alkenyl groups, which may have substituents.
• a "Cyclic” is a cyclic group containing carbon atoms in the main chain. The number of atoms contained in the cyclic group is not particularly limited. Specific examples of the repeating unit represented by formula (E) include those described in paragraphs [0131] to [0133] of WO2018/193954.
• the resin (A) may have repeating units having at least one group selected from lactone groups, sultone groups, carbonate groups, hydroxyl groups, cyano groups, and alkali-soluble groups.
• the repeating unit having a lactone group, a sultone group, or a carbonate group that the resin (A) has include the repeating units described in the above ⁇ Repeating unit having a lactone group, sultone group, or carbonate group>.
• the preferable content is also as described in ⁇ Repeating unit having lactone group, sultone group, or carbonate group>.
• Resin (A) may have a repeating unit having a hydroxyl group or a cyano group. This improves the adhesion to the substrate and the compatibility with the developer.
• a repeating unit having a hydroxyl group or a cyano group is preferably a repeating unit having an alicyclic hydrocarbon structure substituted with a hydroxyl group or a cyano group.
• a repeating unit having a hydroxyl group or a cyano group preferably does not have an acid-decomposable group. Examples of repeating units having a hydroxyl group or a cyano group include those described in paragraphs [0081] to [0084] of JP-A-2014-098921.
• Resin (A) may have a repeating unit having an alkali-soluble group.
• the alkali-soluble group includes a carboxyl group, a sulfonamide group, a sulfonylimide group, a bissulfonylimide group, and an aliphatic alcohol group substituted with an electron-withdrawing group at the ⁇ -position (e.g., hexafluoroisopropanol group). , is preferably a carboxyl group.
• the resin (A) contains a repeating unit having an alkali-soluble group, the resolution for contact holes is increased. Repeating units having an alkali-soluble group include those described in paragraphs [0085] and [0086] of JP-A-2014-098921.
• Resin (A) may have a repeating unit that has an alicyclic hydrocarbon structure and does not exhibit acid decomposability. This can reduce the elution of low-molecular-weight components from the resist film into the immersion liquid during immersion exposure.
• Repeating units having an alicyclic hydrocarbon structure and not exhibiting acid decomposability include, for example, 1-adamantyl (meth)acrylate, diamantyl (meth)acrylate, tricyclodecanyl (meth)acrylate, or cyclohexyl (meth) Examples include repeating units derived from acrylates.
• Resin (A) may have a repeating unit represented by formula (III) that has neither a hydroxyl group nor a cyano group.
• R5 represents a hydrocarbon group having at least one cyclic structure and having neither a hydroxyl group nor a cyano group.
• Ra represents a hydrogen atom, an alkyl group or a --CH 2 --O--Ra 2 group.
• Ra2 represents a hydrogen atom, an alkyl group or an acyl group. Examples of the repeating unit represented by formula (III) having neither a hydroxyl group nor a cyano group include those described in paragraphs [0087] to [0094] of JP-A-2014-098921.
• the resin (A) may have repeating units other than the repeating units described above.
• the resin (A) has repeating units selected from the group consisting of repeating units having an oxathian ring group, repeating units having an oxazolone ring group, repeating units having a dioxane ring group, and repeating units having a hydantoin ring group. You may have Specific examples of repeating units other than the repeating units described above are shown below.
• the resin (A) may contain various repeating structural units for the purpose of adjusting dry etching resistance, suitability for standard developer, substrate adhesion, resist profile, resolution, heat resistance, sensitivity, and the like. may have
• all repeating units are derived from a compound having an ethylenically unsaturated bond. It is preferably composed of repeating units. In particular, it is also preferred that all of the repeating units are composed of (meth)acrylate repeating units. When all of the repeating units are composed of (meth)acrylate repeating units, all of the repeating units are methacrylate repeating units, all of the repeating units are acrylate repeating units, and all of the repeating units are methacrylates. It is possible to use either one based on repeating units and acrylate repeating units, and it is preferable that the acrylate repeating units be 50 mol % or less of the total repeating units.
• Resin (A) can be synthesized according to a conventional method (for example, radical polymerization).
• the weight average molecular weight of the resin (A) is preferably 30,000 or less, more preferably 1,000 to 30,000, still more preferably 3,000 to 30,000, further preferably 5,000 as a polystyrene equivalent value by GPC method. ⁇ 15,000 is particularly preferred.
• the dispersity (molecular weight distribution) of the resin (A) is preferably 1 to 5, more preferably 1 to 3, still more preferably 1.2 to 3.0, and particularly preferably 1.2 to 2.0. The smaller the degree of dispersion, the better the resolution and resist shape, the smoother the side walls of the resist pattern, and the better the roughness.
• the content of the resin (A) is preferably 40.0 to 99.9% by mass, more preferably 60.0 to 90.0% by mass, based on the total solid content of the composition. .
• the resin (A) may be used singly or in combination.
• the composition of the present invention contains a compound that generates an acid upon exposure to actinic rays or radiation (hereinafter also referred to as "photoacid generator (B)").
• the photoacid generator (B) may be in the form of a low-molecular-weight compound, or may be in the form of being incorporated into a part of a polymer (for example, resin (A) described above).
• the form of a low-molecular-weight compound and the form of being incorporated into a part of a polymer for example, the resin (A) described above
• the molecular weight of the photoacid generator is preferably 3,000 or less, more preferably 2,000 or less, and even more preferably 1,000 or less. Although the lower limit is not particularly limited, 100 or more is preferable.
• the photoacid generator (B) is in the form of being incorporated into a part of the polymer, it may be incorporated into a part of the resin (A), or may be incorporated into a resin different from the resin (A). good.
• the photoacid generator (B) is preferably in the form of a low molecular weight compound.
• Examples of the photoacid generator (B) include compounds (onium salts) represented by “M + X ⁇ ”, and compounds that generate an organic acid upon exposure are preferred.
• Examples of the organic acid include sulfonic acid (aliphatic sulfonic acid, aromatic sulfonic acid, camphorsulfonic acid, etc.), carboxylic acid (aliphatic carboxylic acid, aromatic carboxylic acid, aralkylcarboxylic acid, etc.), carbonylsulfonylimide, acids, bis(alkylsulfonyl)imidic acids, and tris(alkylsulfonyl)methide acids.
• M + represents an organic cation.
• the valence of the organic cation may be 1 or 2 or more.
• a cation represented by the formula (ZaI) hereinafter also referred to as “cation (ZaI)
• ZaII a cation represented by the formula (ZaII)
• ZaII a cation represented by the formula (ZaII)
• R 201 , R 202 and R 203 each independently represent an organic group.
• the number of carbon atoms in the organic groups for R 201 , R 202 and R 203 is preferably 1-30, more preferably 1-20.
• Two of R 201 to R 203 may combine to form a ring structure, and the ring may contain an oxygen atom, a sulfur atom, an ester group, an amide group, or a carbonyl group.
• Examples of the group formed by combining two of R 201 to R 203 include an alkylene group (eg, a butylene group and a pentylene group) and —CH 2 —CH 2 —O—CH 2 —CH 2 —. mentioned.
• Suitable embodiments of the organic cation in formula (ZaI) include cation (ZaI-1), cation (ZaI-2), cation (ZaI-3b), and cation (ZaI-4b), which will be described later.
• Cation (ZaI-1) is an arylsulfonium cation in which at least one of R 201 to R 203 in formula (ZaI) above is an aryl group.
• R 201 to R 203 may be aryl groups, or part of R 201 to R 203 may be aryl groups and the rest may be alkyl groups or cycloalkyl groups.
• R 201 to R 203 is an aryl group, and the remaining two of R 201 to R 203 may combine to form a ring structure, in which an oxygen atom, a sulfur atom and an ester group , an amide group, or a carbonyl group.
• the group formed by bonding two of R 201 to R 203 includes, for example, one or more methylene groups substituted with an oxygen atom, a sulfur atom, an ester group, an amide group and/or a carbonyl group. alkylene groups (eg, butylene group, pentylene group, and —CH 2 —CH 2 —O—CH 2 —CH 2 —).
• Arylsulfonium cations include triarylsulfonium cations, diarylalkylsulfonium cations, aryldialkylsulfonium cations, diarylcycloalkylsulfonium cations, and aryldicycloalkylsulfonium cations.
• the aryl group contained in the arylsulfonium cation is preferably a phenyl group or a naphthyl group, more preferably a phenyl group.
• the aryl group may be an aryl group having a heterocyclic structure having an oxygen atom, a nitrogen atom, a sulfur atom, or the like. Heterocyclic structures include pyrrole, furan, thiophene, indole, benzofuran, and benzothiophene residues.
• the arylsulfonium cation has two or more aryl groups, the two or more aryl groups may be the same or different.
• the alkyl group or cycloalkyl group optionally possessed by the arylsulfonium cation is a linear alkyl group having 1 to 15 carbon atoms, a branched alkyl group having 3 to 15 carbon atoms, or 3 to 15 carbon atoms. is preferred, and a methyl group, ethyl group, propyl group, n-butyl group, sec-butyl group, t-butyl group, cyclopropyl group, cyclobutyl group or cyclohexyl group is more preferred.
• substituents that the aryl group, alkyl group and cycloalkyl group of R 201 to R 203 may have include an alkyl group (eg, 1 to 15 carbon atoms), a cycloalkyl group (eg, 3 to 3 carbon atoms).
• aryl groups eg, 6 to 14 carbon atoms
• alkoxy groups eg, 1 to 15 carbon atoms
• cycloalkylalkoxy groups eg, 1 to 15 carbon atoms
• halogen atoms eg, fluorine and iodine
• the substituent may further have a substituent
• the alkyl group preferably has a halogen atom as a substituent to form a halogenated alkyl group such as a trifluoromethyl group.
• the acid-decomposable group is intended to be a group that is decomposed by the action of an acid to generate a polar group, and preferably has a structure in which the polar group is protected by a group that is eliminated by the action of an acid.
• the polar group and leaving group are as described above.
• Cation (ZaI-2) is a cation in which R 201 to R 203 in formula (ZaI) each independently represents an organic group having no aromatic ring.
• Aromatic rings also include aromatic rings containing heteroatoms.
• the number of carbon atoms in the organic group having no aromatic ring as R 201 to R 203 is preferably 1-30, more preferably 1-20.
• R 201 to R 203 are each independently preferably an alkyl group, a cycloalkyl group, an allyl group, or a vinyl group, and a linear or branched 2-oxoalkyl group, 2-oxocycloalkyl group, or An alkoxycarbonylmethyl group is more preferred, and a linear or branched 2-oxoalkyl group is even more preferred.
• the alkyl groups and cycloalkyl groups of R 201 to R 203 are, for example, linear alkyl groups having 1 to 10 carbon atoms or branched alkyl groups having 3 to 10 carbon atoms (e.g., methyl group, ethyl group, propyl group, , butyl group, and pentyl group), and cycloalkyl groups having 3 to 10 carbon atoms (eg, cyclopentyl group, cyclohexyl group, and norbornyl group).
• R 201 to R 203 may be further substituted with a halogen atom, an alkoxy group (eg, 1-5 carbon atoms), a hydroxyl group, a cyano group, or a nitro group. It is also preferred that the substituents of R 201 to R 203 each independently form an acid-decomposable group by any combination of substituents.
• the cation (ZaI-3b) is a cation represented by the following formula (ZaI-3b).
• R 1c to R 5c each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, an alkylcarbonyloxy group, a cycloalkyl represents a carbonyloxy group, a halogen atom, a hydroxyl group, a nitro group, an alkylthio group, or an arylthio group; R 6c and R 7c each independently represent a hydrogen atom, an alkyl group (eg, t-butyl group), a cycloalkyl group, a halogen atom, a cyano group, or an aryl group.
• R 6c and R 7c each independently represent a hydrogen atom, an alkyl group (eg, t-butyl group), a cycloalkyl group, a halogen atom, a cyano group, or an ary
• R x and R y each independently represent an alkyl group, a cycloalkyl group, a 2-oxoalkyl group, a 2-oxocycloalkyl group, an alkoxycarbonylalkyl group, an allyl group, or a vinyl group. It is also preferred that the substituents of R 1c to R 7c , R x and R y independently form an acid-decomposable group by any combination of substituents.
• R 1c to R 5c , R 5c and R 6c , R 6c and R 7c , R 5c and R x , and R x and R y may combine with each other to form a ring.
• the rings may each independently contain an oxygen atom, a sulfur atom, a ketone group, an ester bond, or an amide bond.
• Examples of the ring include aromatic or non-aromatic hydrocarbon rings, aromatic or non-aromatic hetero rings, and polycyclic condensed rings in which two or more of these rings are combined.
• the ring includes a 3- to 10-membered ring, preferably a 4- to 8-membered ring, more preferably a 5- or 6-membered ring.
• Examples of groups formed by bonding two or more of R 1c to R 5c , R 6c and R 7c , and R x and R y include alkylene groups such as a butylene group and a pentylene group. A methylene group in this alkylene group may be substituted with a heteroatom such as an oxygen atom.
• the group formed by combining R 5c and R 6c and R 5c and R x is preferably a single bond or an alkylene group.
• Alkylene groups include methylene and ethylene groups.
• R 1c to R 5c , R 6c , R 7c , R x , R y , and two or more of R 1c to R 5c , R 5c and R 6c , R 6c and R 7c , R 5c and R x , and the ring formed by combining each other with R x and R y may have a substituent.
• the cation (ZaI-4b) is a cation represented by the following formula (ZaI-4b).
• R 13 is a hydrogen atom, a halogen atom (e.g., fluorine atom, iodine atom, etc.), a hydroxyl group, an alkyl group, a halogenated alkyl group, an alkoxy group, a carboxyl group, an alkoxycarbonyl group, or a group containing a cycloalkyl group (cycloalkyl may be the group itself, or may be a group partially containing a cycloalkyl group). These groups may have a substituent.
• a halogen atom e.g., fluorine atom, iodine atom, etc.
• R 14 is a hydroxyl group, a halogen atom (e.g., fluorine atom, iodine atom, etc.), an alkyl group, a halogenated alkyl group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylsulfonyl group, a cycloalkylsulfonyl group, or a cycloalkyl represents a group containing a group (either a cycloalkyl group itself or a group partially containing a cycloalkyl group). These groups may have a substituent. When two or more R 14 are present, each independently represents the above group such as a hydroxyl group.
• a halogen atom e.g., fluorine atom, iodine atom, etc.
• Each R 15 independently represents an alkyl group, a cycloalkyl group, or a naphthyl group. Two R 15 may be joined together to form a ring. When two R 15 are combined to form a ring, the ring skeleton may contain a heteroatom such as an oxygen atom or a nitrogen atom. In one aspect, two R 15 are alkylene groups, preferably joined together to form a ring structure. The ring formed by combining the alkyl group, the cycloalkyl group, the naphthyl group, and the two R 15 groups may have a substituent.
• the alkyl groups of R 13 , R 14 and R 15 may be linear or branched.
• the number of carbon atoms in the alkyl group is preferably 1-10.
• the alkyl group is preferably a methyl group, an ethyl group, an n-butyl group, a t-butyl group, or the like. It is also preferred that each of the substituents of R 13 to R 15 , R x and R y independently forms an acid-decomposable group by any combination of substituents.
• R 204 and R 205 each independently represent an aryl group, an alkyl group or a cycloalkyl group.
• the aryl group for R 204 and R 205 is preferably a phenyl group or a naphthyl group, more preferably a phenyl group.
• the aryl group for R 204 and R 205 may be an aryl group having a heterocyclic ring having an oxygen atom, a nitrogen atom, a sulfur atom, or the like.
• Skeletons of heterocyclic aryl groups include, for example, pyrrole, furan, thiophene, indole, benzofuran, and benzothiophene.
• the alkyl group and cycloalkyl group for R 204 and R 205 include a linear alkyl group having 1 to 10 carbon atoms or a branched alkyl group having 3 to 10 carbon atoms (e.g., methyl group, ethyl group, propyl group, butyl group, or pentyl group), or a cycloalkyl group having 3 to 10 carbon atoms (eg, cyclopentyl group, cyclohexyl group, or norbornyl group).
• the aryl group, alkyl group and cycloalkyl group of R 204 and R 205 may each independently have a substituent.
• substituents that the aryl group, alkyl group and cycloalkyl group of R 204 and R 205 may have include an alkyl group (eg, 1 to 15 carbon atoms) and a cycloalkyl group (eg, 3 to 15), aryl groups (eg, 6 to 15 carbon atoms), alkoxy groups (eg, 1 to 15 carbon atoms), halogen atoms, hydroxyl groups, and phenylthio groups. It is also preferred that the substituents of R 204 and R 205 each independently form an acid-decomposable group by any combination of substituents.
• X ⁇ represents an organic anion.
• the organic anion is not particularly limited, and includes organic anions having a valence of 1, 2 or more.
• an anion having a significantly low ability to cause a nucleophilic reaction is preferred, and a non-nucleophilic anion is more preferred.
• non-nucleophilic anions examples include sulfonate anions (aliphatic sulfonate anions, aromatic sulfonate anions, camphorsulfonate anions, etc.), carboxylate anions (aliphatic carboxylate anions, aromatic carboxylate anions, and aralkyl carboxylic acid anions), sulfonylimide anions, bis(alkylsulfonyl)imide anions, and tris(alkylsulfonyl)methide anions.
• sulfonate anions aliphatic sulfonate anions, aromatic sulfonate anions, camphorsulfonate anions, etc.
• carboxylate anions aliphatic carboxylate anions, aromatic carboxylate anions, and aralkyl carboxylic acid anions
• sulfonylimide anions bis(alkylsulfonyl)imide anions
• the aliphatic moiety in the aliphatic sulfonate anion and the aliphatic carboxylate anion may be a linear or branched alkyl group or a cycloalkyl group, and may be a straight chain having 1 to 30 carbon atoms. Alternatively, a branched alkyl group or a cycloalkyl group having 3 to 30 carbon atoms is preferred.
• the alkyl group may be, for example, a fluoroalkyl group (which may have a substituent other than a fluorine atom, or may be a perfluoroalkyl group).
• the aryl group in the aromatic sulfonate anion and the aromatic carboxylate anion is preferably an aryl group having 6 to 14 carbon atoms, such as a phenyl group, a tolyl group, and a naphthyl group.
• the alkyl group, cycloalkyl group, and aryl group listed above may have a substituent.
• the substituents are not particularly limited, but examples include nitro groups, halogen atoms such as fluorine atoms and chlorine atoms, carboxyl groups, hydroxyl groups, amino groups, cyano groups, alkoxy groups (preferably having 1 to 15 carbon atoms), alkyl groups ( preferably 1 to 10 carbon atoms), a cycloalkyl group (preferably 3 to 15 carbon atoms), an aryl group (preferably 6 to 14 carbon atoms), an alkoxycarbonyl group (preferably 2 to 7 carbon atoms), an acyl group ( preferably 2 to 12 carbon atoms), alkoxycarbonyloxy group (preferably 2 to 7 carbon atoms), alkylthio group (preferably 1 to 15 carbon atoms), alkylsulfonyl group (preferably 1 to 15 carbon atoms), alkylimino A sulfonyl group (preferably having 1
• aralkyl group in the aralkylcarboxylate anion an aralkyl group having 7 to 14 carbon atoms is preferable.
• Aralkyl groups having 7 to 14 carbon atoms include, for example, benzyl, phenethyl, naphthylmethyl, naphthylethyl and naphthylbutyl groups.
• Sulfonylimide anions include, for example, saccharin anions.
• alkyl group in the bis(alkylsulfonyl)imide anion and the tris(alkylsulfonyl)methide anion an alkyl group having 1 to 5 carbon atoms is preferable.
• substituents of these alkyl groups include halogen atoms, halogen-substituted alkyl groups, alkoxy groups, alkylthio groups, alkyloxysulfonyl groups, aryloxysulfonyl groups, and cycloalkylaryloxysulfonyl groups.
• a fluorine atom or an alkyl group substituted with a fluorine atom is preferred.
• the alkyl groups in the bis(alkylsulfonyl)imide anion may combine with each other to form a ring structure. This increases the acid strength.
• non-nucleophilic anions include, for example, phosphorous fluorides (eg, PF 6 ⁇ ), boron fluorides (eg, BF 4 ⁇ ), and antimony fluorides (eg, SbF 6 ⁇ ).
• non-nucleophilic anions include aliphatic sulfonate anions in which at least the ⁇ -position of sulfonic acid is substituted with fluorine atoms, aromatic sulfonate anions in which fluorine atoms or groups having fluorine atoms are substituted, and alkyl groups in which fluorine atoms are present.
• a bis(alkylsulfonyl)imide anion substituted with or a tris(alkylsulfonyl)methide anion in which an alkyl group is substituted with a fluorine atom is preferable.
• perfluoroaliphatic sulfonate anions preferably having 4 to 8 carbon atoms
• benzenesulfonate anions having a fluorine atom are more preferable, nonafluorobutanesulfonate anions, perfluorooctanesulfonate anions, pentafluoro A benzenesulfonate anion or a 3,5-bis(trifluoromethyl)benzenesulfonate anion is more preferred.
• an anion represented by the following formula (AN1) is also preferable.
• R 1 and R 2 each independently represent a hydrogen atom or a substituent.
• substituent is not particularly limited, a group that is not an electron-withdrawing group is preferred.
• groups that are not electron-withdrawing groups include hydrocarbon groups, hydroxyl groups, oxyhydrocarbon groups, oxycarbonyl hydrocarbon groups, amino groups, hydrocarbon-substituted amino groups, and hydrocarbon-substituted amide groups.
• Groups that are not electron-withdrawing groups are preferably -R', -OH, -OR', -OCOR', -NH 2 , -NR' 2 , -NHR' or -NHCOR' each independently.
• R' is a monovalent hydrocarbon group.
• Examples of the monovalent hydrocarbon group represented by R' include alkyl groups such as methyl, ethyl, propyl, and butyl; alkenyl groups such as ethenyl, propenyl, and butenyl; ethynyl monovalent linear or branched hydrocarbon groups such as alkynyl groups such as groups, propynyl groups, and butynyl groups; cyclopropyl groups, cyclobutyl groups, cyclopentyl groups, cyclohexyl groups, norbornyl groups, and adamantyl groups Cycloalkyl group; monovalent alicyclic hydrocarbon group such as cycloalkenyl group such as cyclopropenyl group, cyclobutenyl group, cyclopentenyl group, and norbornenyl group; phenyl group, tolyl group, xylyl group, mesityl group, naphthyl group, methyl aryl groups such as
• L represents a divalent linking group.
• divalent linking groups include -O-CO-O-, -COO-, -CONH-, -CO-, -O-, -S-, -SO-, -SO 2 -, alkylene groups ( preferably 1 to 6 carbon atoms), a cycloalkylene group (preferably 3 to 15 carbon atoms), an alkenylene group (preferably 2 to 6 carbon atoms), and a divalent linking group combining a plurality of these.
• the divalent linking group includes -O-CO-O-, -COO-, -CONH-, -CO-, -O-, -SO 2 -, and -O-CO-O-alkylene group- , -COO-alkylene group-, or -CONH-alkylene group- is preferred, and -O-CO-O-, -O-CO-O-alkylene group-, -COO-, -CONH-, -SO 2 - , or -COO-alkylene group- is more preferred.
• a group represented by the following formula (AN1-1) is preferable. * a - (CR 2a 2 ) X - Q- (CR 2b 2 ) Y - * b (AN1-1)
• * a represents the bonding position with R3 in formula (AN1).
• * b represents the bonding position with -C(R 1 )(R 2 )- in formula (AN1).
• X and Y each independently represent an integer of 0-10, preferably an integer of 0-3.
• R 2a and R 2b each independently represent a hydrogen atom or a substituent. When multiple R 2a and R 2b are present, the multiple R 2a and R 2b may be the same or different. However, when Y is 1 or more, R 2b in CR 2b 2 directly bonded to —C(R 1 )(R 2 )— in formula (AN1) is other than a fluorine atom.
• Q is * A -O-CO-O-* B , * A -CO-* B , * A -CO-O-* B , * A -O-CO-* B , * A -O-* B , * A -S-* B or * A - SO2- * B .
• R3 represents an organic group.
• the organic group is not particularly limited as long as it has 1 or more carbon atoms. branched chain alkyl group) or a cyclic group.
• the organic group may or may not have a substituent.
• the organic group may or may not have a heteroatom (oxygen atom, sulfur atom, and/or nitrogen atom, etc.).
• R 3 is preferably an organic group having a cyclic structure.
• the cyclic structure may be monocyclic or polycyclic, and may have a substituent.
• the ring in the organic group containing a cyclic structure is preferably directly bonded to L in formula (AN1).
• the organic group having a cyclic structure may or may not have a heteroatom (oxygen atom, sulfur atom, and/or nitrogen atom, etc.), for example. Heteroatoms may replace one or more of the carbon atoms that form the ring structure.
• the organic group having a cyclic structure is preferably, for example, a hydrocarbon group having a cyclic structure, a lactone ring group, or a sultone ring group.
• the organic group having a cyclic structure is preferably a hydrocarbon group having a cyclic structure.
• the above hydrocarbon group having a cyclic structure is preferably a monocyclic or polycyclic cycloalkyl group. These groups may have a substituent.
• the cycloalkyl group may be monocyclic (such as cyclohexyl group) or polycyclic (such as adamantyl group), and preferably has 5 to 12 carbon atoms.
• Examples of the lactone group and sultone group include structures represented by the above formulas (LC1-1) to (LC1-21) and structures represented by formulas (SL1-1) to (SL1-3). , preferably a group obtained by removing one hydrogen atom from a ring member atom constituting a lactone structure or a sultone structure.
• the non-nucleophilic anion may be a benzenesulfonate anion, preferably a benzenesulfonate anion substituted with a branched alkyl group or cycloalkyl group.
• an anion represented by the following formula (AN2) is also preferable.
• o represents an integer of 1-3.
• p represents an integer from 0 to 10;
• q represents an integer from 0 to 10;
• Xf represents a hydrogen atom, a fluorine atom, an alkyl group substituted with at least one fluorine atom, or an organic group having no fluorine atom.
• the number of carbon atoms in this alkyl group is preferably 1-10, more preferably 1-4.
• a perfluoroalkyl group is preferred as the alkyl group substituted with at least one fluorine atom.
• Xf is preferably a fluorine atom or a perfluoroalkyl group having 1 to 4 carbon atoms, more preferably a fluorine atom or CF 3 , and even more preferably both Xf are fluorine atoms.
• R4 and R5 each independently represent a hydrogen atom, a fluorine atom, an alkyl group, or an alkyl group substituted with at least one fluorine atom. When multiple R 4 and R 5 are present, each of R 4 and R 5 may be the same or different.
• the alkyl groups represented by R 4 and R 5 preferably have 1 to 4 carbon atoms. The above alkyl group may have a substituent. Hydrogen atoms are preferred as R 4 and R 5 .
• L represents a divalent linking group.
• the definition of L is synonymous with L in formula (AN1).
• W represents an organic group, preferably an organic group containing a cyclic structure.
• a cyclic organic group is preferable.
• Cyclic organic groups include, for example, alicyclic groups, aryl groups, and heterocyclic groups.
• the alicyclic group may be monocyclic or polycyclic.
• Monocyclic alicyclic groups include, for example, monocyclic cycloalkyl groups such as a cyclopentyl group, a cyclohexyl group, and a cyclooctyl group.
• the polycyclic alicyclic group includes, for example, a norbornyl group, a tricyclodecanyl group, a tetracyclodecanyl group, a tetracyclododecanyl group, and a polycyclic cycloalkyl group such as an adamantyl group.
• alicyclic groups having a bulky structure with 7 or more carbon atoms such as norbornyl, tricyclodecanyl, tetracyclodecanyl, tetracyclododecanyl, and adamantyl groups, are preferred.
• Aryl groups may be monocyclic or polycyclic. Examples of the aryl group include phenyl group, naphthyl group, phenanthryl group, and anthryl group.
• a heterocyclic group may be monocyclic or polycyclic. Especially, when it is a polycyclic heterocyclic group, diffusion of acid can be further suppressed.
• a heterocyclic group may or may not have an aromatic character. Heterocyclic rings having aromaticity include, for example, furan ring, thiophene ring, benzofuran ring, benzothiophene ring, dibenzofuran ring, dibenzothiophene ring, and pyridine ring.
• Non-aromatic heterocycles include, for example, a tetrahydropyran ring, a lactone ring, a sultone ring, and a decahydroisoquinoline ring.
• the heterocyclic ring in the heterocyclic group is preferably a furan ring, a thiophene ring, a pyridine ring, or a decahydroisoquinoline ring.
• the cyclic organic group may have a substituent.
• substituents include alkyl groups (either linear or branched, preferably having 1 to 12 carbon atoms), cycloalkyl groups (monocyclic, polycyclic, and spirocyclic). any group, preferably having 3 to 20 carbon atoms), aryl group (preferably having 6 to 14 carbon atoms), hydroxyl group, alkoxy group, ester group, amide group, urethane group, ureido group, thioether group, sulfonamide and sulfonate ester groups.
• carbonyl carbon may be sufficient as carbon (carbon which contributes to ring formation) which comprises a cyclic
• Examples of anions represented by formula (AN2) include SO 3 ⁇ —CF 2 —CH 2 —OCO-(L) q′ —W, SO 3 ⁇ —CF 2 —CHF—CH 2 —OCO-(L) q ' -W, SO 3 - -CF 2 -COO-(L) q' -W, SO 3 - -CF 2 -CF 2 -CH 2 -CH 2 -(L) q -W, or SO 3 - - CF 2 —CH(CF 3 )—OCO—(L) q′ —W is preferred.
• L, q and W are the same as in formula (AN2).
• q' represents an integer from 0 to 10;
• an aromatic sulfonate anion represented by the following formula (AN3) is also preferable.
• Ar represents an aryl group (such as a phenyl group) and may further have a substituent other than the sulfonate anion and -(D-B) group.
• Substituents which may be further included include, for example, a fluorine atom and a hydroxyl group.
• n represents an integer of 0 or more. n is preferably 1 to 4, more preferably 2 to 3, and still more preferably 3.
• D represents a single bond or a divalent linking group.
• Divalent linking groups include ether groups, thioether groups, carbonyl groups, sulfoxide groups, sulfone groups, sulfonate ester groups, ester groups, and groups consisting of combinations of two or more thereof.
• B represents a hydrocarbon group.
• B is preferably an aliphatic hydrocarbon group, more preferably an isopropyl group, a cyclohexyl group, or an optionally substituted aryl group (such as a tricyclohexylphenyl group).
• Disulfonamide anions are also preferred as non-nucleophilic anions.
• a disulfonamide anion is, for example, an anion represented by N ⁇ (SO 2 —R q ) 2 .
• R q represents an optionally substituted alkyl group, preferably a fluoroalkyl group, more preferably a perfluoroalkyl group.
• Two R q may combine with each other to form a ring.
• the group formed by bonding two R q together is preferably an optionally substituted alkylene group, preferably a fluoroalkylene group, more preferably a perfluoroalkylene group.
• the alkylene group preferably has 2 to 4 carbon atoms.
• Non-nucleophilic anions also include anions represented by the following formulas (d1-1) to (d1-4).
• R 51 represents a hydrocarbon group (eg, an aryl group such as a phenyl group) optionally having a substituent (eg, hydroxyl group).
• Z 2c represents an optionally substituted hydrocarbon group having 1 to 30 carbon atoms (provided that the carbon atom adjacent to S is not substituted with a fluorine atom).
• the above hydrocarbon group for Z 2c may be linear or branched, and may have a cyclic structure.
• the carbon atom in the hydrocarbon group (preferably the carbon atom that is a ring member atom when the hydrocarbon group has a cyclic structure) may be carbonyl carbon (--CO-).
• Examples of the hydrocarbon group include a group having an optionally substituted norbornyl group.
• a carbon atom forming the norbornyl group may be a carbonyl carbon.
• Z 2c —SO 3 ⁇ in formula (d1-2) is preferably different from the anions represented by formulas (AN1) to (AN3) above.
• Z 2c is preferably other than an aryl group.
• the ⁇ -position and ⁇ -position atoms with respect to —SO 3 — in Z 2c are preferably atoms other than carbon atoms having a fluorine atom as a substituent.
• the ⁇ -position atom and/or the ⁇ -position atom with respect to —SO 3 — is preferably a ring member atom in a cyclic group.
• R 52 represents an organic group (preferably a hydrocarbon group having a fluorine atom)
• Y 3 represents a linear, branched or cyclic alkylene group, an arylene group, or represents a carbonyl group
• Rf represents a hydrocarbon group
• R 53 and R 54 each independently represent an organic group (preferably a hydrocarbon group having a fluorine atom). R 53 and R 54 may combine with each other to form a ring.
• the organic anions may be used singly or in combination of two or more.
• the photoacid generator (B) is also preferably a compound represented by the following general formula (1) (hereinafter also referred to as “compound (B)").
• R 1 and R 5 each independently represent an aryl group or a heteroaryl group.
• R 2 to R 4 each independently represent a hydrogen atom or a substituent.
• M n+ represents a cation.
• n represents an integer of 1 or more.
• the aryl group for R 1 and R 5 includes, for example, an aryl group having 6 to 15 carbon atoms, and specific examples include a phenyl group, a naphthyl group, an anthryl group, and the like. can.
• the heteroaryl group for R 1 and R 5 includes, for example, a heteroaryl group having 2 to 15 carbon atoms, such as a 5- to 10-membered ring, specifically , furyl group, thienyl group, pyrrolyl group, oxazolyl group, pyridyl group, quinolinyl group, carbazolyl group and the like.
• R 2 to R 4 are not particularly limited as long as they are monovalent substituents, but examples include alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing heteroatoms such as atoms and silicon atoms; and combinations of two or more of these.
• alkyl groups for R 2 to R 4 include alkyl groups having 1 to 30 carbon atoms.
• the alkyl group is preferably an alkyl group having 1 to 20 carbon atoms such as methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, sec-butyl group, hexyl group, 2-ethylhexyl group, octyl group and dodecyl group. and more preferably an alkyl group having 1 to 8 carbon atoms.
• alkenyl groups for R 2 to R 4 include alkenyl groups having 2 to 30 carbon atoms, and alkenyl groups having 2 to 8 carbon atoms are preferred.
• Cycloalkyl groups as R 2 to R 4 may be monocyclic or polycyclic. Although the number of carbon atoms in this cycloalkyl group is not particularly limited, it is preferably 3-8.
• the aryl group for R 2 to R 4 includes, for example, an aryl group having 6 to 15 carbon atoms, and specific examples include a phenyl group, a naphthyl group, an anthryl group, and the like. can.
• Halogen atoms for R 2 to R 4 include, for example, a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
• Groups containing heteroatoms include, for example, hydroxyl group, carboxyl group, alkoxy group, thiol group, thioether group, nitro group, nitroso group, cyano group, amino group, acyloxy group, acylamide group, heteroaryl group, ether bond, carbonyl Conjugation and combinations of two or more of these are included.
• the number of carbon atoms in the alkoxy group, acyloxy group and acylamide group is preferably 20 or less, more preferably 8 or less.
• the alkoxy groups include, for example, methoxy, ethoxy, propoxy, isopropoxy, n-butyroxy, t-butoxy and octyloxy groups. Among them, methoxy group, ethoxy group, propoxy group, isopropoxy group and t-butoxy group are particularly preferred.
• the thioether group includes the same alkoxy groups, except that a sulfur atom is used instead of the oxygen atom.
• Acyloxy groups include, for example, acetyloxy groups.
• the acylamide group includes, for example, an acetylamide group.
• Heteroaryl groups include the same heteroaryl groups as R 1 and R 5 .
• the aryl group and heteroaryl group as R 1 and R 5 may further have a substituent.
• Further substituents include, for example, alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing heteroatoms such as oxygen, sulfur, nitrogen and silicon atoms; A combination of Alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing heteroatoms such as oxygen, sulfur, nitrogen and silicon atoms; Alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing hetero atoms such as oxygen atoms, sulfur atoms, nitrogen atoms and silicon atoms; Similar to combinations of species or more.
• the aryl group and heteroaryl group as R 1 and R 5 have multiple substituents, at least two of the multiple substituents may be bonded to each other to form a ring.
• Alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; groups containing hetero atoms such as oxygen atoms, sulfur atoms, nitrogen atoms and silicon atoms as substituents of R 2 to R 4 further have substituents.
• substituents include, for example, alkyl groups, alkenyl groups, cycloalkyl groups, aryl groups, amino groups, amido groups, ureido groups, urethane groups, hydroxy groups, carboxy groups, halogen atoms, alkoxy groups, thioether groups, acyl groups, groups, acyloxy groups, alkoxycarbonyl groups, cyano groups and nitro groups, and combinations of two or more of these.
• R 1 and R 5 are a group containing a polar group described later, a group containing a group that is decomposed by the action of an acid to increase polarity, or decomposed by the action of an alkaline developer to increase the solubility in the alkaline developer. It is possible to construct a group that includes a group that R 2 to R 4 above are a group containing a polar group described later, a group containing a group that is decomposed by the action of an acid to increase the polarity, or decomposed by the action of an alkaline developer to increase the solubility in the alkaline developer. It is possible to construct a group that includes a group that includes a group that
• R 3 preferably represents an aryl group.
• the aryl group for R 3 include the same aryl groups as those for R 1 and R 5 .
• the aryl group as R3 may further have a substituent.
• the groups described above as specific examples of the substituents that R 1 and R 5 described above may further have can be mentioned.
• the aryl group as R 3 has multiple substituents, at least two of the multiple substituents may be bonded to each other to form a ring.
• At least one of R 1 to R 5 is a group containing a polar group, a group containing a group that is decomposed by the action of an acid to increase its polarity, or a group that is decomposed by the action of an alkaline developer. , is preferably a group containing a group that increases the solubility in an alkaline developer.
• Examples of the polar group in the group containing a polar group as at least one of R 1 to R 5 include a carboxyl group, a phenolic hydroxyl group, a fluorinated alcohol group, a sulfonamide group, a sulfonylimide group, and (alkylsulfonyl) (alkylcarbonyl)methylene group, (alkylsulfonyl)(alkylcarbonyl)imide group, bis(alkylcarbonyl)methylene group, bis(alkylcarbonyl)imide group, bis(alkylsulfonyl)methylene group, bis(alkylsulfonyl)imide group, acidic groups such as a tris(alkylcarbonyl)methylene group and a tris(alkylsulfonyl)methylene group; and alcoholic hydroxyl groups.
• the alcoholic hydroxyl group is a hydroxyl group bonded to a hydrocarbon group, and refers to a hydroxyl group other than a hydroxyl group directly bonded to an aromatic ring (phenolic hydroxyl group). It excludes aliphatic alcohols substituted with functional groups (eg, hexafluoroisopropanol groups, etc.).
• the alcoholic hydroxyl group is preferably a hydroxyl group with a pKa (acid dissociation constant) of 12 or more and 20 or less.
• the polar group is preferably a carboxyl group, a phenolic hydroxyl group, or a fluorinated alcohol group (preferably a hexafluoroisopropanol group).
• a group having a carbonyl bond can also be mentioned as a group containing a polar group.
• groups having a carbonyl bond include alkylcarbonyl groups and arylcarbonyl groups.
• alkyl group include those similar to the alkyl groups for R 2 to R 4 .
• the aryl group includes, for example, the same aryl groups as R 1 and R 5 .
• a group having a carbonyl bond is a group in which the carbonyl bond and the ether bond are not adjacently bonded.
• Alkylcarbonyl groups and arylcarbonyl groups as groups having a carbonyl bond may further have a substituent.
• substituents include, for example, alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing heteroatoms such as oxygen, sulfur, nitrogen and silicon atoms; A combination of Alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing heteroatoms such as oxygen, sulfur, nitrogen and silicon atoms; Alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; groups containing hetero atoms such as oxygen atoms, sulfur atoms, nitrogen atoms and silicon atoms; Similar to combinations of species or more.
• the group containing a polar group is not particularly limited, but an organic group containing a polar group can be mentioned.
• Organic groups containing polar groups include, for example, alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; A group having a polar group, which is a combination of more than one species, can be mentioned.
• Examples of the group containing a polar group include an alkyl group containing a polar group and an aryl group containing a polar group.
• Examples of the alkyl group in the alkyl group containing a polar group include those similar to the alkyl groups for R 2 to R 4 .
• Examples of the aryl group in the aryl group containing a polar group include the same aryl groups as R 1 and R 5 .
• the group containing the polar group may be the polar group itself.
• At least one of R 1 to R 5 is a group containing a group that is decomposed by the action of an acid and increases in polarity (hereinafter also referred to as an "acid-decomposable group"). ) preferably has a structure in which the polar group is protected by a group (leaving group) that decomposes and leaves under the action of an acid.
• the polar group the same polar group as in the group containing a polar group as at least one of R 1 to R 5 can be mentioned.
• Groups that are decomposed and left by the action of an acid include, for example, groups represented by formulas (Y1) to (Y4).
• Formula (Y1) -C(Rx 1 )(Rx 2 )(Rx 3 )
• Formula (Y3) —C(R 36 )(R 37 )(OR 38 )
• Rx 1 to Rx 3 each independently represent an alkyl group (linear or branched) or a cycloalkyl group (monocyclic or polycyclic).
• Rx 1 to Rx 3 are alkyl groups (linear or branched)
• at least two of Rx 1 to Rx 3 are preferably methyl groups.
• Rx 1 to Rx 3 preferably each independently represent a linear or branched alkyl group
• Rx 1 to Rx 3 each independently represent a linear alkyl group. is more preferred.
• Two of Rx 1 to Rx 3 may combine to form a monocyclic or polycyclic ring.
• the alkyl groups of Rx 1 to Rx 3 include alkyl groups having 1 to 4 carbon atoms such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group and t-butyl group. preferable.
• the cycloalkyl groups represented by Rx 1 to Rx 3 include monocyclic cycloalkyl groups such as cyclopentyl and cyclohexyl groups, norbornyl, tetracyclodecanyl, tetracyclododecanyl, and adamantyl groups. is preferred.
• Cycloalkyl groups formed by combining two of Rx 1 to Rx 3 include monocyclic cycloalkyl groups such as cyclopentyl and cyclohexyl, norbornyl, tetracyclodecanyl, and tetracyclododeca.
• a polycyclic cycloalkyl group such as a nil group and an adamantyl group is preferable, and a monocyclic cycloalkyl group having 5 to 6 carbon atoms is more preferable.
• a cycloalkyl group formed by combining two of Rx 1 to Rx 3 is, for example, a group in which one of the methylene groups constituting the ring has a heteroatom such as an oxygen atom or a heteroatom such as a carbonyl group. may be replaced.
• Rx 1 is a methyl group or an ethyl group
• Rx 2 and Rx 3 combine to form the above-mentioned cycloalkyl group. is preferred.
• R 36 to R 38 each independently represent a hydrogen atom or a monovalent organic group.
• R 37 and R 38 may combine with each other to form a ring.
• Monovalent organic groups include alkyl groups, cycloalkyl groups, aryl groups, aralkyl groups, and alkenyl groups. It is also preferred that R 36 is a hydrogen atom.
• L 1 and L 2 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or a group combining these (e.g., a group combining an alkyl group and an aryl group).
• M represents a single bond or a divalent linking group.
• Q is an alkyl group optionally containing a heteroatom, a cycloalkyl group optionally containing a heteroatom, an aryl group optionally containing a heteroatom, an amino group, an ammonium group, a mercapto group, a cyano group, an aldehyde group, or a group combining these (for example, a group combining an alkyl group and a cycloalkyl group).
• one of the methylene groups may be replaced by a heteroatom such as an oxygen atom or a group containing a heteroatom such as a carbonyl group.
• L 1 and L 2 is preferably a hydrogen atom, and the other is preferably an alkyl group, a cycloalkyl group, an aryl group, or a combination of an alkylene group and an aryl group. At least two of Q, M and L 1 may combine to form a ring (preferably a 5- or 6-membered ring).
• L2 is preferably a secondary or tertiary alkyl group, more preferably a tertiary alkyl group.
• Secondary alkyl groups include isopropyl, cyclohexyl and norbornyl groups, and tertiary alkyl groups include tert-butyl and adamantane groups.
• the Tg (glass transition temperature) and the activation energy are increased, so that the film strength can be ensured and fogging can be suppressed.
• Ar represents an aromatic ring group.
• Rn represents an alkyl group, a cycloalkyl group or an aryl group.
• Rn and Ar may combine with each other to form a non-aromatic ring.
• Ar is more preferably an aryl group.
• the acid-decomposable group preferably has an acetal structure.
• the acetal structure is, for example, a structure in which a polar group such as a carboxyl group, a phenolic hydroxyl group, or a fluorinated alcohol group is protected with a group represented by the above formula (Y3).
• the group containing an acid-decomposable group is not particularly limited as long as it is a group containing an acid-decomposable group, and an organic group containing an acid-decomposable group can be mentioned.
• organic groups containing acid-decomposable groups include alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; and a group having an acid-decomposable group.
• Examples of the group containing an acid-decomposable group include an alkyl group containing an acid-decomposable group and an aryl group containing an acid-decomposable group.
• Examples of the alkyl group in the alkyl group containing an acid-decomposable group include those similar to the alkyl groups for R 2 to R 4 .
• Examples of the aryl group in the aryl group containing an acid-decomposable group include the same aryl groups as R 1 and R 5 .
• the group containing an acid-decomposable group may be the acid-decomposable group itself.
• At least one of R 1 to R 5 includes a group that is decomposed by the action of an alkaline developer and increases the solubility in the alkaline developer, and decomposes by the action of the alkaline developer and is dissolved in the alkaline developer.
• a group that increases the solubility at is also called a "polar conversion group", and specific examples include a lactone group, a carboxylic acid ester group (-COO-), an acid anhydride group (-C(O)OC(O) -), acid imide group (-NHCONH-), carboxylic acid thioester group (-COS-), carbonate group (-OC(O)O-), sulfate group (-OSO 2 O-), sulfonate group (—SO 2 O—) and the like.
• groups containing polar conversion groups include acyloxy groups, alkoxycarbonyloxy groups, aryloxycarbonyloxy groups, aryloxycarbonyl groups, alkoxycarbonyl groups, carbamoyl groups, and imide groups.
• the acyl group in the acyloxy group preferably has 1 to 30 carbon atoms, more preferably 1 to 8 carbon atoms.
• the alkoxy group in the alkoxycarbonyloxy group preferably has 1 to 30 carbon atoms, more preferably 1 to 8 carbon atoms.
• the aryl group in the aryloxycarbonyloxy group preferably has 6 to 14 carbon atoms, more preferably 6 to 10 carbon atoms.
• the aryl group in the aryloxycarbonyl group preferably has 6 to 14 carbon atoms, more preferably 6 to 10 carbon atoms.
• the number of carbon atoms in the alkoxy group in the alkoxycarbonyl group is preferably 1-30, more preferably 1-8.
• An imide group is a group obtained by removing one hydrogen atom from imide.
• the acyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, aryloxycarbonyl group, alkoxycarbonyl group, carbamoyl group and imido group may further have a substituent.
• substituents the groups described above as specific examples of the substituents that R 1 and R 5 described above may further have can be mentioned.
• the polarity conversion group is a group represented by X in the partial structure represented by general formula (KA-1) or (KB-1).
• X in the general formula (KA-1) or (KB-1) is a carboxylic acid ester group: -COO-, an acid anhydride group: -C(O)OC(O)-, an acid imide group: -NHCONH-, Carboxylic acid thioester group: -COS-, carbonate group: -OC(O)O-, sulfate group: -OSO 2 O-, sulfonate group: -SO 2 O-.
• Y 1 and Y 2 may be the same or different and represent an electron-withdrawing group.
• the compound (B) has a group having a partial structure represented by general formula (KA-1) or (KB-1) as a group containing a polarity conversion group.
• the partial structure represented by the general formula (KA-1), and the partial structure represented by (KB-1) when Y 1 and Y 2 are monovalent, the above partial structure is a bond is not present, the group having the above partial structure is a group having a monovalent or higher valence group from which at least one arbitrary hydrogen atom in the above partial structure is removed.
• the partial structure represented by general formula (KA-1) is a structure that forms a ring structure together with a group as X.
• X in general formula (KA-1) is preferably a carboxylate group (that is, when KA-1 forms a lactone ring structure), an acid anhydride group, or a carbonate group.
• a carboxylic acid ester group is more preferred.
• the ring structure represented by general formula (KA-1) may have a substituent, for example, it may have nka substituents Z ka1 .
• Z ka1 When there are more than one Z ka1 , each independently represents an alkyl group, a cycloalkyl group, an ether group, a hydroxyl group, an amide group, an aryl group, a lactone ring group, or an electron-withdrawing group.
• Z ka1 may be linked together to form a ring. Examples of the ring formed by combining Z ka1 include a cycloalkyl ring and a hetero ring (cyclic ether ring, lactone ring, etc.).
• nka represents an integer from 0 to 10; It is preferably an integer of 0-8, more preferably an integer of 0-5, still more preferably an integer of 1-4, and most preferably an integer of 1-3.
• the electron-withdrawing group for Z ka1 is the same as the electron-withdrawing group for Y 1 and Y 2 typified by a halogen atom.
• the electron-withdrawing group may be substituted with another electron-withdrawing group.
• Z ka1 is preferably an alkyl group, a cycloalkyl group, an ether group, a hydroxyl group, or an electron-withdrawing group, more preferably an alkyl group, a cycloalkyl group, or an electron-withdrawing group.
• the ether group one substituted with an alkyl group, a cycloalkyl group, or the like, that is, an alkyl ether group or the like is preferable.
• Preferred examples of the electron-withdrawing group are the same as the electron-withdrawing groups for Y 1 and Y 2 described later.
• a halogen atom as Z ka1 includes a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like, and a fluorine atom is preferable.
• the alkyl group as Z ka1 may have a substituent and may be linear or branched.
• the linear alkyl group preferably has 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, and examples thereof include methyl, ethyl, n-propyl, n-butyl, sec-butyl and t-butyl.
• the branched alkyl group preferably has 3 to 30 carbon atoms, more preferably 3 to 20 carbon atoms, and examples thereof include i-propyl, i-butyl, t-butyl, i-pentyl, t-pentyl, i-hexyl group, t-hexyl group, i-heptyl group, t-heptyl group, i-octyl group, t-octyl group, i-nonyl group, t-decanoyl group and the like.
• the cycloalkyl group as Z ka1 may have a substituent, and may be monocyclic, polycyclic, or bridged.
• a cycloalkyl group may have a bridged structure.
• a cycloalkyl group having 3 to 8 carbon atoms is preferable, and examples thereof include a cyclopropyl group, a cyclopentyl group, a cyclohexyl group, a cyclobutyl group and a cyclooctyl group.
• Examples of the polycyclic type include groups having a bicyclo, tricyclo, tetracyclo structure having 5 or more carbon atoms, preferably a cycloalkyl group having 6 to 20 carbon atoms, such as adamantyl group, norbornyl group, isobornyl group, Campanyl group, dicyclopentyl group, ⁇ -pinel group, tricyclodecanyl group, tetocyclododecyl group, androstanyl group and the like.
• the following structure is also preferable as the cycloalkyl group.
• Some of the carbon atoms in the cycloalkyl group may be substituted with heteroatoms such as oxygen atoms.
• Preferred alicyclic moieties include adamantyl group, noradamantyl group, decalin group, tricyclodecanyl group, tetracyclododecanyl group, norbornyl group, cedrol group, cyclohexyl group, cycloheptyl group, cyclooctyl group, and cyclodecanyl. and the cyclododecanyl group.
• adamantyl group More preferred are adamantyl group, decalin group, norbornyl group, cedrol group, cyclohexyl group, cycloheptyl group, cyclooctyl group, cyclodecanyl group, cyclododecanyl group and tricyclodecanyl group.
• Substituents for these alicyclic structures include alkyl groups, halogen atoms, hydroxyl groups, alkoxy groups, carboxyl groups, and alkoxycarbonyl groups.
• the alkyl group is preferably a lower alkyl group such as methyl, ethyl, propyl, isopropyl or butyl, more preferably methyl, ethyl, propyl or isopropyl.
• Preferred examples of the alkoxy group include those having 1 to 4 carbon atoms such as methoxy, ethoxy, propoxy and butoxy. Examples of substituents that the alkyl group and the alkoxy group may have include a hydroxyl group, a halogen atom, an alkoxy group (preferably having 1 to 4 carbon atoms), and the like.
• Examples of the lactone ring group for Z ka1 include groups obtained by removing a hydrogen atom from structures represented by any of (KA-1-1) to (KA-1-17) described later.
• the aryl group for Z ka1 includes, for example, a phenyl group and a naphthyl group.
• alkyl group, cycloalkyl group and aryl group of Z ka1 may further have include a hydroxyl group, a halogen atom (fluorine, chlorine, bromine, iodine), a nitro group, a cyano group, the above alkyl group, a methoxy group, Alkoxy groups such as ethoxy group, hydroxyethoxy group, propoxy group, hydroxypropoxy group, n-butoxy group, isobutoxy group, sec-butoxy group and t-butoxy group, alkoxycarbonyl groups such as methoxycarbonyl group and ethoxycarbonyl group, benzyl aralkyl groups such as phenethyl group and cumyl group; acyl groups such as aralkyloxy group, formyl group, acetyl group, butyryl group, benzoyl group, cyanamyl group and valeryl group; acyloxy groups such as butyryl
• X in general formula (KA-1) is a carboxylic acid ester group
• the partial structure represented by general formula (KA-1) is preferably a lactone ring, preferably a 5- to 7-membered lactone ring.
• the 5- to 7-membered lactone ring as the partial structure represented by the general formula (KA-1) has a bicyclo structure, a spiro Other ring structures are preferably condensed to form a structure.
• Peripheral ring structures to which the ring structure represented by general formula (KA-1) may be bound include, for example, those in (KA-1-1) to (KA-1-17) below, or I can list the thing which I followed.
• Structures represented by any of the following (KA-1-1) to (KA-1-17) are more preferable as structures containing a lactone ring structure represented by general formula (KA-1).
• the lactone structure may be directly bonded to the main chain.
• Preferred structures include (KA-1-1), (KA-1-4), (KA-1-5), (KA-1-6), (KA-1-13), (KA-1- 14), (KA-1-17).
• the structure containing the lactone ring structure may or may not have a substituent.
• Preferred substituents include those similar to the substituents that the ring structure represented by the general formula (KA-1) may have.
• Some lactone structures have an optically active form, but any optically active form may be used.
• one type of optically active substance may be used alone, or a plurality of optically active substances may be mixed and used.
• optical purity ee is preferably 90% or more, more preferably 95% or more, and most preferably 98% or more.
• a carboxylic acid ester group (-COO-) can be preferably mentioned as X in the general formula (KB-1).
• Y 1 and Y 2 in general formula (KB-1) each independently represent an electron-withdrawing group.
• the electron-withdrawing group preferably has a partial structure represented by the following formula (EW).
• * in formula (EW) represents a bond directly linked to (KA-1) or a bond directly linked to X in (KB-1).
• n ew is the repeating number of the linking group represented by —C(R ew1 )(R ew2 )— and represents an integer of 0 or 1; When new is 0, it represents a single bond, indicating that Yew1 is directly bonded.
• Y ew1 is a halogen atom, a cyano group, a nitrile group, a nitro group, a halo(cyclo)alkyl group represented by —C(R f1 )(R f2 )—R f3 described later, a haloaryl group, an oxy group, a carbonyl group; , sulfonyl groups, sulfinyl groups, and combinations thereof, and the electron-withdrawing group may be, for example, the following structure.
• the "halo(cyclo)alkyl group” represents an alkyl group and a cycloalkyl group which are at least partially halogenated.
• R ew3 and R ew4 each independently represent an arbitrary structure.
• R ew3 and R ew4 may have any structure, and the partial structure represented by the formula (EW) has electron-withdrawing properties, and is preferably an alkyl group, a cycloalkyl group, or a fluorinated alkyl group.
• Y ew1 is a group having a valence of 2 or more, the remaining bond forms a bond with any atom or substituent.
• Y ew1 is preferably a halogen atom, or a halo(cyclo)alkyl or haloaryl group represented by —C(R f1 )(R f2 )—R f3 .
• R ew1 and R ew2 each independently represent an arbitrary substituent such as a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group. At least two of R ew1 , R ew2 and Y ew1 may be linked together to form a ring.
• R f1 represents a halogen atom, a perhaloalkyl group, a perhalocycloalkyl group or a perhaloaryl group, more preferably a fluorine atom, a perfluoroalkyl group or a perfluorocycloalkyl group, still more preferably a fluorine atom or a tri represents a fluoromethyl group.
• R f2 and R f3 each independently represent a hydrogen atom, a halogen atom or an organic group, and R f2 and R f3 may be linked to form a ring.
• Examples of the organic group include an alkyl group, a cycloalkyl group, an alkoxy group, and the like, which may be substituted with a halogen atom (preferably a fluorine atom), and more preferably R f2 and R f3 are (halo) is an alkyl group.
• R f2 more preferably represents the same group as R f1 or is linked to R f3 to form a ring.
• R f1 and R f3 may be linked to form a ring, and the ring to be formed includes a (halo)cycloalkyl ring, a (halo)aryl ring and the like.
• the (halo)alkyl group for R f1 to R f3 includes, for example, the alkyl group for Z ka1 described above and a halogenated structure thereof.
• the cycloalkyl group in Z ka1 described above is halogen structure, more preferably a fluorocycloalkyl group represented by -C (n) F (2n-2) H, and a perfluoroaryl group represented by -C (n) F (n-1) mentioned.
• the number of carbon atoms n is not particularly limited, it is preferably 5 to 13, more preferably 6.
• the ring which may be formed by combining at least two of R ew1 , R ew2 and Y ew1 is preferably a cycloalkyl group or a heterocyclic group, and the heterocyclic group is preferably a lactone ring group.
• the lactone ring include structures represented by the above formulas (KA-1-1) to (KA-1-17).
• Part or all of the partial structure of general formula (KA-1) may also serve as an electron-withdrawing group as Y 1 or Y 2 in general formula (KB-1).
• X in general formula (KA-1) is a carboxylic acid ester group
• the carboxylic acid ester group functions as an electron-withdrawing group as Y 1 or Y 2 in general formula (KB-1). It is possible.
• the group containing a polarity conversion group is not particularly limited, but an organic group containing a polarity conversion group can be mentioned.
• organic groups containing polar conversion groups include alkyl groups; alkenyl groups; cycloalkyl groups; aryl groups; halogen atoms; A combination of two or more types and having a polar conversion group can be mentioned.
• Examples of the group containing a polarity conversion group include an alkyl group containing a polarity conversion group and an aryl group containing a polarity conversion group.
• Examples of the alkyl group in the alkyl group containing the polarity conversion group include those similar to the alkyl groups for R 2 to R 4 .
• Examples of the aryl group in the aryl group containing a polarity conversion group include the same aryl groups as R 1 and R 5 .
• R 1 , R 3 and R 5 are preferably groups represented by the following general formula (Ar).
• R 6 to R 10 each independently represent a hydrogen atom or a substituent. At least one of R 6 to R 10 is a group containing a polar group, a group containing a group that is decomposed by the action of an acid to increase the polarity, or is decomposed by the action of an alkaline developer and has solubility in an alkaline developer. is a group containing increasing groups. * represents a bond to the benzene ring in general formula (1).
• R 6 to R 10 are the same as those for R 2 to R 4 described above.
• At least one of R 6 to R 10 is a group containing a polar group, a group containing a group that is decomposed by the action of an acid to increase the polarity, or is decomposed by the action of an alkaline developer and has solubility in an alkaline developer. is a group containing increasing groups.
• the group containing a polar group is the same as the group containing a polar group as at least one of R 1 to R 5 .
• the group containing a group which is decomposable by the action of an acid to increase its polarity is the same as the group containing a group which is decomposable by the action of an acid to increase its polarity as at least one of R 1 to R 5 .
• a group containing a group that decomposes under the action of an alkaline developer and increases its solubility in an alkaline developer, as at least one of R 1 to R 5 decomposes under the action of an alkaline developer and dissolves in the alkaline developer. The same is true for groups containing groups that increase the solubility in.
• R 1 , R 3 and R 5 are preferably groups represented by the following general formula (Ar1).
• R 11 to R 15 each independently represent a hydrogen atom or a substituent, and at least one of R 11 to R 15 represents a substituent Y below.
• * represents a bond to the benzene ring in general formula (1).
• Substituent Y hydroxy group, carboxyl group, group having a carbonyl bond, acyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, aryloxycarbonyl group, alkoxycarbonyl group, carbamoyl group, or imido group
• R 11 to R 15 are the same as those for R 2 to R 4 described above. At least one of R 11 to R 15 represents the substituent Y described above.
• the group having a carbonyl bond as the substituent Y are the same as the specific examples of the group having a carbonyl bond as the group having the polar group described above.
• the acyl group in the acyloxy group as the substituent Y preferably has 1 to 30 carbon atoms, more preferably 1 to 8 carbon atoms.
• the alkoxy group in the alkoxycarbonyloxy group as the substituent Y preferably has 1 to 30 carbon atoms, more preferably 1 to 8 carbon atoms.
• the aryl group in the aryloxycarbonyloxy group as the substituent Y preferably has 6 to 14 carbon atoms, more preferably 6 to 10 carbon atoms.
• the aryl group in the aryloxycarbonyl group as the substituent Y preferably has 6 to 14 carbon atoms, more preferably 6 to 10 carbon atoms.
• the number of carbon atoms of the alkoxy group in the alkoxycarbonyl group as the substituent Y is preferably 1-30, more preferably 1-8.
• the imide group as the substituent Y is a group obtained by removing one hydrogen atom from imide.
• a group having a carbonyl bond, an acyloxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an aryloxycarbonyl group, an alkoxycarbonyl group, and an imide group as the substituent Y may further have a substituent.
• the groups described above as specific examples of the substituents that R 1 and R 5 described above may further have can be mentioned.
• n in the anion part of the general formula (1) represents the number of anions. n represents an integer of 1 or more. Although the upper limit of n is not particularly limited, it is 4, for example. It is preferred that n is 1.
• M n+ in the general formula (1) represents a cation.
• n in the cation part of the general formula (1) represents the valence of the cation.
• n represents an integer of 1 or more.
• the upper limit of n is not particularly limited, it is 4, for example. It is preferred that n is 1.
• the cation as M n+ is not particularly limited as long as it is a cation having a valence of 1 or more, but is preferably an onium cation, and preferably a cation represented by the above formula (ZaI) or formula (ZaII).
• Preferred embodiments of the cation in formula (ZaI) include the cation (ZaI-1), cation (ZaI-2), cation (ZaI-3b), and cation (ZaI-4b) described above.
• the bivalent or higher cation when n is 2 or more may be a cation having a plurality of structures represented by formula (ZaI).
• Such cations include, for example, at least one of R 201 to R 203 of the cation represented by formula (ZaI) and at least one of R 201 to R 203 of another cation represented by formula (ZaI).
• Examples include divalent cations having a structure in which two are bonded via a single bond or a linking group.
• M n+ (cation) in general formula (1) include specific examples of M + organic cations in the compound represented by “M + X ⁇ ” described above.
• the pKa of the acid generated by the compound (B) is preferably -10 or more and 5 or less.
• photoacid generator (B) Preferable examples of the photoacid generator (B) are shown below, but the present invention is not limited to these.
• Me represents a methyl group.
• Preferred examples of the photoacid generator (B) also include compounds in which the above anions and the above cations are combined.
• Compound (B) can be synthesized, for example, by a method using a coupling reaction.
• the counter cation can be converted into the desired cation M 2 + by, for example, a known anion exchange method described in JP-A-6-184170 or a conversion method using an ion exchange resin.
• Examples of coupling reactions include the following.
• X represents a halogen atom and A represents an alkyl group.
• R represents a substituent.
• Y represents a group that forms compound XY through a coupling reaction.
• the content is not particularly limited, but since the cross-sectional shape of the formed pattern becomes more rectangular, the total solid content of the composition is , is preferably 0.5% by mass or more, more preferably 1.0% by mass or more.
• the content is preferably 50.0% by mass or less, more preferably 30.0% by mass or less, and even more preferably 25.0% by mass or less, relative to the total solid content of the composition.
• the photoacid generator (B) may be used alone or in combination of two or more.
• the composition of the present invention may contain an acid diffusion control agent.
• the acid diffusion control agent traps the acid generated from the photoacid generator or the like during exposure, and acts as a quencher that suppresses the reaction of the acid-decomposable resin in the unexposed area due to excess generated acid.
• the type of acid diffusion controller is not particularly limited, and examples include basic compounds (CA), low-molecular-weight compounds (CB) having nitrogen atoms and groups that leave under the action of acids, and actinic rays or radiation. and a compound (CC) whose ability to control acid diffusion decreases or disappears upon irradiation.
• a basic compound (CA) include, for example, those described in paragraphs [0132] to [0136] of WO2020/066824, and the basicity is reduced or reduced by exposure to actinic rays or radiation.
• Specific examples of the disappearing basic compound (CE) include those described in paragraphs [0137] to [0155] of WO 2020/066824, and paragraph [0164] of WO 2020/066824.
• CB low-molecular compound having a nitrogen atom and a group that leaves under the action of an acid
• CD onium salt compound
• paragraphs [0627] to [0664] of US Patent Application Publication No. 2016/0070167A1 paragraphs [0095] to [0187] of US Patent Application Publication No. 2015/0004544A1
• paragraphs [0237190A1 and paragraphs [0259] to [0328] of US Patent Application Publication No. 2016/0274458A1 can be suitably used as acid diffusion control agents.
• the content of the acid diffusion control agent (the total if there are more than one) is 0.1 to 15.0% relative to the total solid content of the composition. 0% by mass is preferred, and 1.0 to 15.0% by mass is more preferred.
• one type of acid diffusion control agent may be used alone, or two or more types may be used in combination.
• the composition of the invention may further comprise a hydrophobic resin different from resin (A).
• Hydrophobic resins are preferably designed to be unevenly distributed on the surface of the resist film. may not contribute to
• the effects of adding a hydrophobic resin include control of the static and dynamic contact angles of the resist film surface with respect to water, and suppression of outgassing.
• the hydrophobic resin preferably has one or more of a fluorine atom, a silicon atom, and a CH3 partial structure contained in the side chain portion of the resin. It is more preferable to have The hydrophobic resin preferably has a hydrocarbon group with 5 or more carbon atoms. These groups may be present in the main chain of the resin or may be substituted on the side chain. Hydrophobic resins include compounds described in paragraphs [0275] to [0279] of WO2020/004306.
• the content of the hydrophobic resin is preferably 0.01 to 20.0% by mass, and 0.1 to 15.0% by mass, based on the total solid content of the composition. % by mass is more preferred.
• the composition of the invention may contain a surfactant.
• a surfactant When a surfactant is contained, it is possible to form a pattern with excellent adhesion and fewer development defects.
• the surfactant is preferably a fluorine-based and/or silicon-based surfactant. Fluorinated and/or silicon-based surfactants include surfactants disclosed in paragraphs [0218] and [0219] of WO2018/193954.
• One type of these surfactants may be used alone, or two or more types may be used.
• the content of the surfactant is preferably 0.0001 to 2.0% by mass, preferably 0.0005 to 1.0%, based on the total solid content of the composition. % by mass is more preferred, and 0.1 to 1.0% by mass is even more preferred.
• the composition of the invention preferably contains a solvent.
• Solvent consists of (M1) propylene glycol monoalkyl ether carboxylate and (M2) propylene glycol monoalkyl ether, lactate, acetate, alkoxypropionate, linear ketone, cyclic ketone, lactone, and alkylene carbonate. It is preferable to include at least one selected from the group.
• the solvent may further contain components other than components (M1) and (M2).
• a combination of the above-described solvent and the above-described resin is preferable from the viewpoint of improving the coatability of the resist composition and reducing the number of development defects in the pattern. Since the solvent described above has a good balance of solubility, boiling point, and viscosity of the resin described above, it is possible to suppress unevenness in the thickness of the resist film and generation of deposits during spin coating. Details of component (M1) and component (M2) are described in paragraphs [0218] to [0226] of WO2020/004306, the contents of which are incorporated herein.
• the content of components other than components (M1) and (M2) is preferably 5 to 30% by mass relative to the total amount of the solvent.
• the content of the solvent in the composition of the present invention is preferably determined so that the solid content concentration is 0.5 to 30% by mass, more preferably 1 to 20% by mass. By doing so, the applicability of the composition can be further improved.
• the solid content means all components other than the solvent, and as described above, it means the components that form the actinic ray-sensitive or radiation-sensitive film.
• the solid content concentration is the mass percentage of the mass of other components excluding the solvent relative to the total mass of the composition of the present invention. "Total solid content” refers to the total mass of components excluding the solvent from the total composition of the composition of the present invention.
• the “solid content” is a component excluding the solvent, and may be solid or liquid at 25° C., for example.
• the composition of the present invention may contain a compound that cross-links the resin by the action of an acid (hereinafter also referred to as a cross-linking agent (G)).
• a cross-linking agent As the cross-linking agent (G), known compounds can be appropriately used.
• known compounds disclosed in paragraphs [0379] to ⁇ 0431> of US Patent Application Publication No. 2016/0147154A1 and paragraphs ⁇ 0064> to ⁇ 0141> of US Patent Application Publication No. 2016/0282720A1 can be suitably used as the cross-linking agent (G).
• the cross-linking agents may be used singly or in combination of two or more.
• the content of the cross-linking agent (G) is preferably 25% by mass, preferably 0.1 to 10% by mass, based on the total solid content of the composition of the present invention. .
• the composition of the present invention contains a dissolution-inhibiting compound, a dye, a plasticizer, a photosensitizer, a light-absorbing agent, and/or a compound that promotes solubility in a developer (for example, a phenolic compound having a molecular weight of 1000 or less, or An alicyclic or aliphatic compound containing a carboxyl group) may further be included.
• a dissolution-inhibiting compound for example, a phenolic compound having a molecular weight of 1000 or less, or An alicyclic or aliphatic compound containing a carboxyl group
• the “dissolution-inhibiting compound” is a compound with a molecular weight of 3000 or less, which is decomposed by the action of an acid to reduce its solubility in an organic developer.
• the composition of the specification is suitably used as a photosensitive composition for EUV exposure.
• EUV light has a wavelength of 13.5 nm, which is shorter than ArF (wavelength 193 nm) light and the like, so the number of incident photons is smaller when exposed with the same sensitivity. Therefore, the influence of "photon shot noise", in which the number of photons stochastically varies, is large, leading to deterioration of LER and bridge defects.
• photon shot noise there is a method of increasing the number of incident photons by increasing the amount of exposure, but this is a trade-off with the demand for higher sensitivity.
• Step 1 Step of forming an actinic ray-sensitive or radiation-sensitive film on a substrate with an actinic ray-sensitive or radiation-sensitive resin composition
• Step 2 Step 3: Exposure of the actinic ray-sensitive or radiation-sensitive film : A step of developing the exposed actinic ray-sensitive or radiation-sensitive film with an alkaline developer. The procedures of each of the above steps will be described in detail below.
• Step 1 is a step of forming an actinic ray-sensitive or radiation-sensitive film on a substrate using the composition of the present invention.
• the actinic ray-sensitive or radiation-sensitive resin composition is applied onto the substrate. method.
• the pore size of the filter is preferably 0.1 ⁇ m or less, more preferably 0.05 ⁇ m or less, and even more preferably 0.03 ⁇ m or less.
• Filters are preferably made of polytetrafluoroethylene, polyethylene, or nylon.
• the actinic ray-sensitive or radiation-sensitive resin composition can be applied onto a substrate (eg, silicon, silicon dioxide coating) used in the manufacture of integrated circuit elements by a suitable coating method such as a spinner or coater.
• the coating method is preferably spin coating using a spinner.
• the rotation speed for spin coating using a spinner is preferably 1000 to 3000 rpm.
• the substrate may be dried to form an actinic ray-sensitive or radiation-sensitive film.
• various undercoat films inorganic film, organic film, antireflection film may be formed under the actinic ray-sensitive or radiation-sensitive film.
• Heating can be carried out by a means provided in a normal exposure machine and/or a developing machine, and may be carried out using a hot plate or the like.
• the heating temperature is preferably 80 to 150°C, more preferably 80 to 140°C, even more preferably 80 to 130°C.
• the heating time is preferably 30 to 1000 seconds, more preferably 60 to 800 seconds, even more preferably 60 to 600 seconds.
• the film thickness of the actinic ray-sensitive or radiation-sensitive film is not particularly limited, it is preferably 10 to 120 nm from the viewpoint of forming finer patterns with higher precision.
• the film thickness of the resist film is more preferably 10 to 65 nm, and even more preferably 15 to 50 nm.
• the film thickness of the resist film is more preferably 10 to 120 nm, still more preferably 15 to 90 nm.
• a topcoat composition may be used to form a topcoat on the upper layer of the resist film. It is preferable that the topcoat composition does not mix with the resist film and can be uniformly coated on the upper layer of the resist film.
• the topcoat is not particularly limited, and a conventionally known topcoat can be formed by a conventionally known method. can be formed. For example, it is preferable to form a topcoat containing a basic compound as described in JP-A-2013-61648 on the resist film.
• Specific examples of basic compounds that the topcoat may contain include basic compounds that the actinic ray-sensitive or radiation-sensitive resin composition may contain.
• the topcoat also preferably contains a compound containing at least one group or bond selected from the group consisting of an ether bond, a thioether bond, a hydroxyl group, a thiol group, a carbonyl bond, and an ester bond.
• Step 2 is the step of exposing the actinic ray-sensitive or radiation-sensitive film.
• the exposure method include a method of irradiating the formed actinic ray-sensitive or radiation-sensitive film with actinic rays or radiation through a predetermined mask.
• Actinic rays or radiation include infrared light, visible light, ultraviolet light, far ultraviolet light, extreme ultraviolet light, X-rays, and electron beams, preferably 250 nm or less, more preferably 220 nm or less, 1 to 200 nm Particularly preferred are wavelengths of deep UV light, specifically KrF excimer lasers (248 nm), ArF excimer lasers (193 nm), F2 excimer lasers (157 nm), EUV (13.5 nm), X-rays, and electron beams.
• baking is preferably performed before development. Baking accelerates the reaction in the exposed area, resulting in better sensitivity and pattern shape.
• the heating temperature is preferably 80 to 150°C, more preferably 80 to 140°C, even more preferably 80 to 130°C.
• the heating time is preferably 10 to 1000 seconds, more preferably 10 to 180 seconds, even more preferably 30 to 120 seconds. Heating can be carried out by a means provided in a normal exposing machine and/or developing machine, and may be carried out using a hot plate or the like. This step is also called a post-exposure bake.
• Step 3 is a step of developing the exposed actinic ray-sensitive or radiation-sensitive film using an alkaline developer to form a positive pattern.
• Examples of the developing method include a method of immersing the substrate in a tank filled with a developer for a certain period of time (dip method), and a method of developing by standing the developer on the surface of the substrate for a certain period of time by raising the developer by surface tension (puddle method). method), a method of spraying the developer onto the substrate surface (spray method), and a method of continuously discharging the developer while scanning the developer discharge nozzle at a constant speed onto the substrate rotating at a constant speed (dynamic dispensing method). ). Further, after the step of developing, a step of stopping development may be performed while replacing the solvent with another solvent.
• the development time is not particularly limited as long as the resin in the unexposed area is sufficiently dissolved, and is preferably 10 to 300 seconds, more preferably 20 to 120 seconds.
• the temperature of the developer is preferably 0 to 50°C, more preferably 15 to 35°C.
• alkaline aqueous solution containing alkali is not particularly limited, for example, quaternary ammonium salts represented by tetramethylammonium hydroxide, inorganic alkalis, primary amines, secondary amines, tertiary amines, alcohol amines, or cyclic amines. and an alkaline aqueous solution containing Among them, the alkaline developer is preferably an aqueous solution of a quaternary ammonium salt represented by tetramethylammonium hydroxide (TMAH). Suitable amounts of alcohols, surfactants and the like may be added to the alkaline developer.
• the alkali concentration of the alkali developer is usually preferably 0.1 to 20% by mass.
• the pH of the alkaline developer is usually preferably from 10.0 to 15.0.
• the pattern forming method preferably includes a step of washing with a rinse after step 3.
• Pure water is an example of the rinse solution used in the rinse step after the step of developing with an alkaline developer.
• An appropriate amount of surfactant may be added to pure water.
• An appropriate amount of surfactant may be added to the rinse solution.
• the method of the rinsing step is not particularly limited. For example, a method of continuously discharging the rinsing liquid onto the substrate rotating at a constant speed (rotation coating method), or a method of immersing the substrate in a tank filled with the rinsing liquid for a certain period of time. a method (dip method) and a method of spraying a rinse liquid onto the substrate surface (spray method).
• the pattern forming method may include a heating step (Post Bake) after the rinsing step. In this step, the developing solution and the rinse solution remaining between the patterns and inside the patterns due to baking are removed. In addition, this process smoothes the resist pattern, and has the effect of improving the roughness of the surface of the pattern.
• the heating step after the rinsing step is usually carried out at 40 to 250° C. (preferably 90 to 200° C.) for 10 seconds to 3 minutes (preferably 30 seconds to 120 seconds).
• the substrate may be etched using the formed pattern as a mask. That is, the pattern formed in step 3 may be used as a mask to process the substrate (or the underlying film and substrate) to form a pattern on the substrate.
• the method for processing the substrate (or the underlying film and the substrate) is not particularly limited, but the substrate (or the underlying film and the substrate) is dry-etched using the pattern formed in step 3 as a mask.
• a method of forming a pattern is preferred. Dry etching is preferably oxygen plasma etching.
• composition of the present invention e.g., solvent, developer, rinse, composition for forming an antireflection film, composition for forming a topcoat, etc.
• impurities such as The content of impurities contained in these materials is preferably 1 mass ppm or less, more preferably 10 mass ppb or less, still more preferably 100 mass ppt or less, particularly preferably 10 mass ppt or less, and most preferably 1 mass ppt or less.
• the lower limit is not particularly limited, and is preferably 0 mass ppt or more.
• metal impurities include Na, K, Ca, Fe, Cu, Mg, Al, Li, Cr, Ni, Sn, Ag, As, Au, Ba, Cd, Co, Pb, Ti, V, W, and Zn.
• Methods for reducing impurities such as metals contained in various materials include, for example, a method of selecting raw materials with a low metal content as raw materials constituting various materials, and a method of filtering raw materials constituting various materials with a filter. and a method of performing distillation under conditions in which contamination is suppressed as much as possible by, for example, lining the inside of the apparatus with Teflon (registered trademark).
• impurities may be removed with an adsorbent, or filter filtration and adsorbent may be used in combination.
• adsorbent known adsorbents can be used.
• inorganic adsorbents such as silica gel and zeolite, and organic adsorbents such as activated carbon can be used.
• metal impurities such as metals contained in the various materials described above, it is necessary to prevent metal impurities from entering during the manufacturing process. Whether the metal impurities are sufficiently removed from the manufacturing equipment can be confirmed by measuring the content of the metal component contained in the cleaning liquid used for cleaning the manufacturing equipment.
• the content of the metal component contained in the cleaning liquid after use is preferably 100 mass ppt (parts per trillion) or less, more preferably 10 mass ppt or less, and even more preferably 1 mass ppt or less.
• the lower limit is not particularly limited, and is preferably 0 mass ppt or more.
• Organic processing liquids such as rinsing liquids should contain conductive compounds to prevent damage to chemical piping and various parts (filters, O-rings, tubes, etc.) due to electrostatic charging and subsequent electrostatic discharge.
• the conductive compound is not particularly limited, and examples thereof include methanol.
• the amount added is not particularly limited, but is preferably 10% by mass or less, more preferably 5% by mass or less, from the viewpoint of maintaining preferable developing properties or rinsing properties.
• the lower limit is not particularly limited, and is preferably 0.01% by mass or more.
• chemical liquid pipe for example, SUS (stainless steel), antistatic treated polyethylene, polypropylene, or various pipes coated with fluororesin (polytetrafluoroethylene, perfluoroalkoxy resin, etc.) can be used.
• Antistatic treated polyethylene, polypropylene, or fluororesin (polytetrafluoroethylene, perfluoroalkoxy resin, etc.) can also be used for filters and O-rings.
• the present specification also relates to an electronic device manufacturing method, including the pattern forming method described above, and an electronic device manufactured by this manufacturing method.
• a preferred embodiment of the electronic device of the present specification includes a mode in which it is installed in electric/electronic equipment (household appliances, OA (Office Automation), media-related equipment, optical equipment, communication equipment, etc.).
• the present invention also relates to a compound represented by the following general formula (b) (hereinafter also referred to as compound (b)).
• each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• A represents an aromatic ring group or an aromatic heterocyclic group.
• Xb represents an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a combination thereof. Xb may combine with the A ring to form a benzene ring.
• Y 1 and Y 2 each independently represent an oxygen atom or a sulfur atom.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom.
• R 12 may combine with the A ring to form a ring, in which case R 12 represents a single bond or an alkylene group.
• n represents an integer of 1 to 6;
• R 1 , A, Y 1 , Y 2 , R 11 to R 13 , and n in general formula (b) are R 1 , A, Y 2 , R 1 in general formula (a), It has the same meaning as Y 1 , Y 2 , R 11 to R 13 and n, and preferred examples are also the same.
• Xb represents an alkylene group, an alkenylene group, an alkynylene group, a carbonyl group, a sulfonyl group, or a combination thereof.
• alkylene group, alkenylene group and alkynylene group represented by Xb include the alkylene group, alkenylene group and alkynylene group represented by X in the above general formula (a), and preferable examples are the same.
• Xb may combine with the A ring to form a benzene ring.
• the compound represented by the general formula (b) is a compound represented by the following general formula (bb).
• R 1 , A, Y 1 , Y 2 , R 11 to R 13 , and n in general formula (bb) are R 1 , A, Y 1 , Y 2 , R 11 to R in general formula (b) is synonymous with 13 and n.
• Xb is preferably an alkylene group or a carbonyl group, more preferably a methylene group, an ethylene group, or a carbonyl group, and even more preferably a carbonyl group.
• the compound represented by general formula (b) is preferably a compound represented by general formula (b-1) below.
• Each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring.
• a 1 represents a benzene ring group.
• Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom. However, R 12 may combine with the benzene ring in general formula (b-1) to form a ring, in which case R 12 represents a single bond or an alkylene group.
• R 1 and R 11 to R 13 in general formula (b-1) have the same meanings as R 1 and R 11 to R 13 in general formula (b) above, and preferred examples are also the same.
• the compound represented by general formula (b) is preferably a compound represented by general formula (b-2) below.
• Each R 1 independently represents a hydrogen atom or a substituent. At least one of R 1 represents an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, an alkenyl group, or an alkynyl group. R 1 may combine with each other to form a ring. Each of R 11 to R 13 independently represents a hydrogen atom, an organic group, or a halogen atom. However, R 12 may combine with the benzene ring in general formula (b-2) to form a ring, in which case R 12 represents a single bond or an alkylene group.
• R 1 and R 11 to R 13 in general formula (b-2) have the same meanings as R 1 and R 11 to R 13 in general formula (b) above, and preferred examples are also the same.
• Specific examples of the compound represented by the general formula (b) include monomers in which X is other than a single bond among specific examples of the raw material monomers of the repeating unit (a) in the resin (A) described above.
• the method for synthesizing compound (b) is not particularly limited, and it can be synthesized, for example, by the method described in Examples.
• the compound (b) can be suitably used as a raw material monomer for the repeating unit (a) in the resin (A) described above. may contain decomposition products of
• cyclohexanone was added to give a solution with a monomer concentration of 30% by mass
• dimethyl 2,2'-azobis(2-methylpropionate) was added at 8 mol% as an initiator, and the monomer solution was It was adjusted.
• Cyclohexanone was heated to 85° C. in an amount of 0.1 times the mass of the above monomer solution in a nitrogen atmosphere, and the monomer solution was added dropwise over 2 hours, followed by further reaction at 85° C. for 2 hours.
• Resin (A)> The structures of the resins (A) used (resins A-1 to A-48) are shown below. Resins A-1 to A-10 and A-12 to A-48 were synthesized in the same manner as above. Table 1 shows the type and content of each repeating unit (content ratio (mol %)), weight average molecular weight (Mw), and degree of dispersion (Mw/Mn). In Table 1, repeating units (a-1) to (a-36) corresponding to the repeating unit (a) shown in repeating unit 2 are raw material monomers (a-1) to (a-36) shown below, respectively.
• each repeating unit shown in Table 1 The structural formula of each repeating unit shown in Table 1 is shown below.
• the repeating unit corresponding to the repeating unit (a) shown in repeating unit 2 is shown as the structural formula of the corresponding raw material monomer.
• Photoacid generator (B) The structure of the photoacid generator (B) used is shown below.
• Compounds (B-1) to (B-80) are obtained by combining the cations listed in Table 2 and the anions listed in Table 2.
• Me represents a methyl group and Bu represents an n-butyl group.
• Me represents a methyl group and Bu represents an n-butyl group.
• W-1 to W-4 below were used as surfactants.
• W-1 Megafac R08 (manufactured by Dainippon Ink and Chemicals Co., Ltd.; fluorine and silicon type)
• W-2 Polysiloxane polymer KP-341 (manufactured by Shin-Etsu Chemical Co., Ltd.; silicone-based)
• W-3 Troisol S-366 (manufactured by Troy Chemical Co., Ltd.; fluorine-based)
• EB exposure and development (4) Preparation of resist pattern
• the resist film obtained in (3) above was subjected to pattern irradiation using an electron beam lithography system (F7000S manufactured by Advantest Co., Ltd., acceleration voltage 50 KeV). After irradiation, it was heated on a hot plate at 100° C. for 600 seconds, immersed in a 2.38% by mass tetramethylammonium hydroxide (TMAH) aqueous solution for 60 seconds, rinsed with water for 30 seconds, and dried.
• TMAH tetramethylammonium hydroxide
• the sensitivity was defined as the irradiation energy for resolving a 1:1 line and space pattern with a line width of 50 nm.
• Roughness performance was evaluated by line width roughness (LWR) as follows.
• ⁇ Pattern shape> The cross-sectional shape of a 1:1 line and space pattern with a line width of 50 nm at the irradiation dose showing the above sensitivity is observed using a scanning electron microscope (S-4800 manufactured by Hitachi, Ltd.)
• S-4800 manufactured by Hitachi, Ltd.
• the ratio represented by [line width at the top part (surface part) of the line pattern / line width at the middle part of the line pattern (half the height of the line pattern)] is 1.1 or more, the "reverse Those with a ratio of 1.03 or more and less than 1.1 were evaluated as "slightly reverse taper", and those with a ratio of less than 1.03 were evaluated as "rectangular”.
• composition of the present invention has excellent resolution and roughness performance, and an excellent pattern shape can be obtained.
• the sensitivity was defined as the irradiation energy for resolving a 1:1 line and space pattern with a line width of 50 nm.
• Roughness performance was evaluated by line width roughness (LWR) as follows.
• ⁇ Pattern shape> The cross-sectional shape of a 1:1 line and space pattern with a line width of 50 nm at the irradiation dose showing the above sensitivity is observed using a scanning electron microscope (S-4800 manufactured by Hitachi, Ltd.)
• S-4800 manufactured by Hitachi, Ltd.
• the ratio represented by [line width at the top part (surface part) of the line pattern / line width at the middle part of the line pattern (half the height of the line pattern)] is 1.1 or more, the "reverse Those with a ratio of 1.03 or more and less than 1.1 were evaluated as "slightly reverse taper", and those with a ratio of less than 1.03 were evaluated as "rectangular”.
• composition of the present invention has excellent resolution and roughness performance, and an excellent pattern shape can be obtained.
• the positive sensitization is excellent in resolution, further excellent in roughness performance, and excellent in pattern shape.
• a light or radiation-sensitive resin composition, an actinic light-sensitive or radiation-sensitive resin film formed from the actinic light-sensitive or radiation-sensitive resin composition, and an actinic light-sensitive or radiation-sensitive resin composition It is possible to provide a pattern forming method and an electronic device manufacturing method to be used, and a compound that can be suitably used for the actinic ray-sensitive or radiation-sensitive resin composition.

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