WO2006028071A1 - レジスト用重合体、レジスト用重合体の製造方法、レジスト組成物、およびパターンが形成された基板の製造方法 - Google Patents
レジスト用重合体、レジスト用重合体の製造方法、レジスト組成物、およびパターンが形成された基板の製造方法 Download PDFInfo
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- WO2006028071A1 WO2006028071A1 PCT/JP2005/016297 JP2005016297W WO2006028071A1 WO 2006028071 A1 WO2006028071 A1 WO 2006028071A1 JP 2005016297 W JP2005016297 W JP 2005016297W WO 2006028071 A1 WO2006028071 A1 WO 2006028071A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/282—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing two or more oxygen atoms
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- 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
- C08F222/00—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 carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/12—Esters of phenols or saturated alcohols
- C08F222/20—Esters containing oxygen in addition to the carboxy oxygen
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0046—Photosensitive materials with perfluoro compounds, e.g. for dry lithography
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
Definitions
- Resist polymer method for producing resist polymer, resist composition, and method for producing substrate on which pattern is formed
- the present invention relates to a resist polymer, a method for producing the same, a resist composition containing the same, and a method for producing a substrate on which a pattern is formed, and is particularly suitable for fine processing using an excimer laser or an electron beam.
- the present invention relates to a resist composition.
- the irradiation light has a shorter wavelength. Specifically, from conventional ultraviolet rays typified by g-line (wavelength: 438 nm) and i-line (wavelength: 365 nm). The irradiation light changes to a shorter wavelength DUV (Deep Ultra Violet).
- DUV Deep Ultra Violet
- KrF excimer laser (wavelength: 248 nm) lithography technology has been introduced to the field, and ArF excimer laser (wavelength: 193 nm) lithography technology and F excimer laser (wavelength: 157 nm) lithography technology, which have been further shortened, are being studied. Being!
- an acrylic resin that is transparent to light having a wavelength of 193 nm has attracted attention.
- acrylic resin for example, a polymer of (meth) acrylic acid ester having an adamantane skeleton in the ester part and a polymer of (meth) acrylic acid ester having a rataton skeleton in the ester part is disclosed in Patent Document 1 and Patent Document It is disclosed in 2nd grade. [0004]
- these acrylic resins are used as resist resins, development defects called differentials occur during development with an alkaline developer for producing resist patterns. There is.
- the resist pattern may be missing, causing circuit disconnection, defects, etc., leading to a decrease in yield in the semiconductor manufacturing process. Further, since these polymers are produced without using a chain transfer agent such as thiols, there is a problem that the molecular weight distribution is wide.
- Patent Document 3 discloses a resin having a carboxylic acid group at at least one end of a molecular chain and having increased solubility in an alkaline developer by the action of an acid.
- the carboxylic acid present at the molecular end causes the elimination reaction of the functional group that becomes alkali-soluble by the acid, so that the sensitivity is high. There is a risk that resist performance will deteriorate, such as changing.
- the resin contains a constitutional unit having an adamantyl skeleton and a constitutional unit having a rataton skeleton, and increases the dissolution rate in an alkaline developer by the action of an acid.
- at least one of the molecular chains A resin having a specific group such as a thiohydroxy group or a thiocarboxy group derived from a sulfur-containing chain transfer agent is disclosed in Patent Document 4, and these resins are prepared using a sulfur-containing chain transfer agent.
- the molecular weight distribution is narrow, but during storage, the sulfur atom present at the end of the molecular chain promotes the decomposition of the photoacid generator, which may deteriorate the resist performance, for example, by changing the sensitivity.
- Patent Document 5 discloses a polymerization method using a solvent such as propylene glycol monomethyl ether acetate (hereinafter also referred to as PGMEA) or propylene glycol monomethyl ether ZP GMEA mixed solvent as a polymerization solvent.
- a solvent such as propylene glycol monomethyl ether acetate (hereinafter also referred to as PGMEA) or propylene glycol monomethyl ether ZP GMEA mixed solvent as a polymerization solvent.
- the resin obtained by this method for producing a polymer compound for photoresist has excellent solubility in a resist solvent, but has a small number of hydrophilic ends, so that the molecular weight is poorly compatible with an alkali developer. Wide distribution. For this reason, as in Patent Documents 1 and 2, a defect occurs in the resist pattern due to the differential, resulting in circuit disconnection or defects. At the same time, there is a risk of reducing the yield in the semiconductor manufacturing process.
- Patent Document 1 JP-A-10-319595
- Patent Document 2 Japanese Patent Laid-Open No. 10-274852
- Patent Document 3 Japanese Patent Laid-Open No. 10-55069
- Patent Document 4 Japanese Patent Laid-Open No. 2001-117232
- Patent Document 5 Japanese Patent Laid-Open No. 2003-206315
- the present invention provides high sensitivity, high resolution, narrow molecular weight distribution, and preservation when used as a resist composition when used as a resist composition in DUV excimer laser lithography or electron beam lithography.
- Resist polymer having excellent stability and good processability (powder characteristics of re-precipitated wet powder), its production method, resist composition containing resist polymer, and resist composition
- An object of the present invention is to provide a method for manufacturing a substrate on which a conventional pattern is formed.
- the inventors of the present invention diligently studied to achieve the above-mentioned object, and in particular, focused on the constituent unit of the resist polymer and the polymerization solvent in producing the resist polymer, and as a result, the specific polymerization solvent.
- the present inventors have found that the above-mentioned problems can be solved by using a resist polymer containing a specific structural unit obtained by polymerization using a polymer for the resist composition, and the present invention has been completed.
- the first gist of the present invention is that the structural unit (A) having a rataton skeleton, the structural unit (B) having an acid-eliminable group, the structural unit (C) having a hydrophilic group, and A resist polymer ( ⁇ ′) containing a polymer (Y) having a structural unit (E) having the structure of formula (1), wherein the content of the structural unit ( ⁇ ) is such that the resist polymer Out of the total number of structural units in ( ⁇ ') Resist polymer ( ⁇ ') (
- L is a linear, branched or cyclic divalent hydrocarbon group having 1 to 20 carbon atoms, and this divalent hydrocarbon group has a substituent and a Z or heteroatom.
- R 11 is a linear, branched, or cyclic g-valent hydrocarbon group having 1 to 20 carbon atoms, and the g-valent hydrocarbon group includes a substituent and Z or hetero. (It may have an atom.)
- G represents an integer of 1 to 24.
- a second aspect of the present invention is a monomer that provides a structural unit (A) having a rataton skeleton in a polymerization solvent containing the hydroxy group-containing ester (e) in an amount of 25% by mass or more based on the total amount of the polymerization solvent.
- a monomer comprising (a) a monomer (b) giving a structural unit (B) having an acid-eliminable group, and (c) a monomer giving a structural unit (C) having a hydrophilic group
- This is a method for producing a resist polymer by polymerizing the resist.
- a third aspect of the present invention is a resist composition containing the resist polymer or the resist polymer obtained by the production method.
- a fourth gist of the present invention is a pattern comprising a step of applying the resist composition onto a substrate to be processed, a step of exposing with light having a wavelength of 250 nm or less, and a step of developing using a developer. This is a method for manufacturing a substrate on which is formed.
- the resist polymer of the present invention has good permeability in the production process (powder characteristics of re-precipitation wet powder), and the resist composition containing the resist polymer has high sensitivity and high sensitivity. Resolution In addition, since the molecular weight distribution is narrow, the diffetat during development is small, and since it does not contain sulfur atoms, it has excellent storage stability when used as a resist composition. Further, the method for producing a resist polymer of the present invention can produce a resist polymer having such characteristics with high productivity.
- the resist polymer and resist composition of the present invention can be suitably used for DUV excimer laser lithography, these immersion lithography and electron beam lithography, particularly ArF excimer laser lithography and this immersion lithography. it can .
- a high-precision fine resist pattern can be formed by the pattern manufacturing method of the present invention, whereby a substrate on which a high-precision fine pattern is formed can be manufactured.
- the resist polymer ( ⁇ ⁇ ⁇ ⁇ ) of the present invention will be described.
- the resist polymer ( ⁇ ′) of the present invention contains a polymer ( ⁇ ).
- the polymer ( ⁇ ) is composed of a structural unit ( ⁇ ) having a lactone skeleton, a structural unit ( ⁇ ) having an acid leaving group, a structural unit (C) having a hydrophilic group, and the following formula (1): Having a structural unit ( ⁇ ) having the structure
- L is a linear, branched or cyclic divalent hydrocarbon group having 1 to 20 carbon atoms, and this divalent hydrocarbon group has a substituent and a ⁇ or hetero atom.
- R 11 is a linear, branched, or cyclic g-valent hydrocarbon group having 1 to 20 carbon atoms, and the g-valent hydrocarbon group includes a substituent and Z or hetero. You may have an atom, g is an integer from 1 to 24 Represents a number.
- the structural unit (A) having a rataton skeleton has an effect of developing the adhesion of the resist composition to the substrate.
- the content of the structural unit (A) is not particularly limited, but from the viewpoint of adhesion to the substrate, 30 mol% or more of the total number of structural units of the resist polymer ( ⁇ ′) is preferably 35 mol. % Is more preferable. Further, from the viewpoint of the sensitivity and resolution of the resist, 60 mol% or less is preferable, 55 mol% or less is more preferable, and 50 mol% or less is more preferable.
- the structural unit ( ⁇ ) when the structural unit ( ⁇ ) has a group that is decomposed or eliminated by the action of an acid, it tends to have better sensitivity.
- the structural unit ( ⁇ ) also corresponds to the structural unit ( ⁇ ) described later.
- such a structural unit is regarded as a structural unit ( ⁇ ). .
- the structural unit ( ⁇ ) has a hydrophilic group, the resist pattern rectangularity tends to be good.
- the structural unit ( ⁇ ) corresponds to the structural unit (C) described later, but in the present invention, such a structural unit is regarded as the structural unit ( ⁇ ).
- the structural unit ( ⁇ ) having a rataton skeleton is not particularly limited, but is selected from the following formulas (4-1) to (4-4) from the viewpoint of sensitivity or dry etching resistance. At least one type is preferred.
- R 41 represents a hydrogen atom or a methyl group
- R 4Q1 and R 4Q2 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, hydroxy A group, a carboxy group, or a carboxy group esterified with an alcohol having 1 to 6 carbon atoms, there is a force!
- / ⁇ is a combination of R 4Q1 and R 4 ° 2 together with one O—, one S— , 1 NH— or a methylene chain having a chain length of 1 to 6 [— (CH 2) (where j represents an integer of 1 to 6)], i represents 0 or 1,
- X 5 represents the number of carbon atoms
- n5 represents an integer of 0 to 4, and m represents 1 or 2. In addition, when n5 is 2 or more, X 5 includes a plurality of different groups.
- R 42 represents a hydrogen atom or a methyl group
- R 2Q1 and R 2Q2 are each independently Represents a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, a hydroxy group, a carboxy group, or a carboxy group esterified with an alcohol having 1 to 6 carbon atoms.
- AA 2 is independently a hydrogen atom or carbon number.
- X 6 has 1 to 6 carbon atoms
- the linear or branched alkyl group having 1 to 6 carbon atoms includes a hydroxy group, a carboxy group, an acyl group having 1 to 6 carbon atoms, a carboxy group esterified with an alcohol having 1 to 6 carbon atoms, and a cyano group as a substituent. It may have at least one group selected from the group consisting of a group and an amino group.
- n6 represents an integer of 0 to 4.
- X 6 includes a plurality of different groups.
- R 43 represents a hydrogen atom or a methyl group
- R ⁇ and R 2M each independently represent a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, a hydroxy group
- a 3 and A 4 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, a hydroxy group, and a carboxy group.
- X 7 has 1 to 6 carbon atoms
- the linear or branched alkyl group having 1 to 6 carbon atoms includes a hydroxy group, a carboxy group, an acyl group having 1 to 6 carbon atoms, a carboxy group esterified with an alcohol having 1 to 6 carbon atoms, and a cyano group as a substituent. And having at least one group selected from the group consisting of a group and an amino group.
- n7 represents an integer of 0 to 4.
- X 7 includes a plurality of different groups.
- R 91 , R 92 , R 93 , and R 94 are each independently a hydrogen atom, a straight chain having 1 to 6 carbon atoms Or a force representing a branched alkyl group, a hydroxy group, a carboxy group, or a carboxy group esterified with an alcohol having 1 to 6 carbon atoms, or R 91 and R 92 together — O, S—, — NH or a methylene chain with a chain length of 1-6 [-(CH)-(t is an integer of 1-6
- n5 in the formula (4-1) is preferably 0 from the viewpoint of high dry etching resistance.
- M in the formula (4-1) is 1 from the viewpoint of sensitivity and resolution. Preferably there is.
- a 2 is highly soluble in organic solvents, which is preferred to be combined with CH — and CH — from the viewpoint of high dry etching resistance. From the first
- R 2Q1 and R 2Q2 in formula ( 4-2 ) are each independently preferably a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group from the viewpoint of high solubility in an organic solvent.
- N6 in (4-2) is preferably 0 from the viewpoint of high dry etching resistance.
- V From the point of view, it is preferable to be one O- together.
- R 2Q3 and R 2M in formula (4-3) are each independently preferably a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group from the viewpoint of high solubility in an organic solvent.
- N7 in Formula (4-3) is preferably 0 from the viewpoint of high dry etching resistance.
- R 91 , R 92 , R 93 , and R 94 are organic. From the viewpoint of high solubility in a solvent, each independently preferably a hydrogen atom or a methyl group.
- Ml in the formula (4-4) is preferably 1 from the viewpoint of sensitivity and resolution.
- the structural unit (A) having a rataton skeleton can be used alone or in combination of two or more as required.
- the polymer having the structural unit (A) having an outer skeleton has a structure having an outer skeleton. It can be produced by polymerizing a monomer containing the monomer (a) that gives the unit (A).
- the monomer (a) is not particularly limited, and examples thereof include monomers represented by the following formulas (10-1) to (: LO-24).
- R represents a hydrogen atom or a methyl group.
- the “acid-leaving group” refers to a group that decomposes or leaves by the action of an acid.
- the structural unit (B) having an acid-eliminable group is a component that is soluble in an alkali by an acid, and has an effect of enabling formation of a resist pattern.
- the content of the structural unit (B) is not particularly limited, but from the standpoint of sensitivity and resolution, 20 mol% or more is preferable in the total number of structural units of the resist polymer ( ⁇ ') 25 mol% or more It is preferable. Also, from the viewpoint of adhesion to the substrate surface or the like, 60 mol% or less is preferable 55 mol% or less is more preferable 50 mol% or less is more preferable.
- the substrate adhesion tends to be good.
- the structural unit) also corresponds to the structural unit ( ⁇ ).
- such a structural unit is regarded as the structural unit ( ⁇ ).
- the structural unit ( ⁇ ) has a hydrophilic group, it tends to have better sensitivity.
- the structural unit) also falls under the structural unit (C) described later.
- such a structural unit is regarded as a structural unit ( ⁇ ).
- the structural unit ( ⁇ ) having an acid leaving group is not particularly limited, but from the viewpoint of high dry etching resistance required for a resist, the following formulas (3-1-1) and (3— 2—1), (3- 3 — 1), (3— 4—1), (3— 5— 1), (3— 6— 1), (3— 7—1) and (3— 8— 1) It is preferably at least one selected from the group that can help.
- R 31 represents a hydrogen atom or a methyl group
- R 1 represents an alkyl group having 1 to 3 carbon atoms
- X 1 represents 1 carbon atom.
- X 1 includes a plurality of different groups.
- R 32 represents a hydrogen atom or a methyl group
- R 2 and R 3 each independently represents an alkyl group having 1 to 3 carbon atoms
- X 2 represents 1 to 6 carbon atoms.
- N2 represents an integer of 0 to 4.
- n2 is 2 or more, it includes that X 2 has a plurality of different groups.
- R 33 represents a hydrogen atom or a methyl group
- R 4 represents an alkyl group having 1 to 3 carbon atoms
- R 331 , R 332 , R 333 , R 334 Each independently represents a hydrogen atom, a straight chain or branched alkyl group having 1 to 6 carbon atoms
- Z 2 each independently represents —O—, —S—, —NH or a methylene chain having a chain length of 1 to 6 ((CH 2) 1 (ul represents an integer of 1 to 6)]
- X represents a hydrogen atom or a methyl group
- R 4 represents an alkyl group having 1 to 3 carbon atoms
- R 331 , R 332 , R 333 , R 334 Each independently represents a hydrogen atom, a straight chain or branched alkyl group having 1 to 6 carbon atoms
- Z 2 each independently represents —O—, —S—, —NH or a methylene chain having a chain length of 1 to 6 ((
- n3 represents an integer of 0 to 4
- q represents 0 or 1.
- X 3 includes a plurality of different groups.
- R 34 represents a hydrogen atom or a methyl group
- R 5 represents an alkyl group having 1 to 3 carbon atoms
- X 4 is a straight or branched chain having 1 to 6 carbon atoms.
- n4 represents an integer of 0 to 4
- r represents an integer of 0 to 2.
- n4 is 2 or more, it includes that X 4 has a plurality of different groups.
- R 35 represents a hydrogen atom or a methyl group, R 351 ,
- R 354 each independently represents a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms
- Z 3 and Z 4 are each independently O, 1 S, 1 NH, or a methylene chain having a chain length of 1 to 6 [ -(CH) 1 (ul l represents an integer of 1 to 6)], and
- X 51 is a straight chain of 1 to 6 carbon atoms
- R 355 , R 356 and R 357 each independently represent a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms or a derivative thereof, or a linear or branched alkyl group having 1 to 4 carbon atoms.
- R 356 and R 357 is the alicyclic hydrocarbon group or a derivative thereof, or two of R 355 , R 356 and R 357 are bonded to each other, A divalent alicyclic hydrocarbon group having 4 to 20 carbon atoms or a derivative thereof is formed together with the carbon atoms to which each is bonded, and R 355 , R 356 , and R 357 are not involved in bonding.
- the remaining one represents a linear or branched alkyl group having 1 to 4 carbon atoms, a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms, or a derivative thereof. It should be noted that when n51 is 2 or more, X 51 includes a plurality of different groups.
- R 36 represents a hydrogen atom or a methyl group
- R 361 , R ⁇ and R 364 each independently represent a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms
- Z 5 and Z 6 are each independently —O—, —S—, —NH or Methylene chain with chain length of 1-6 [ ⁇ (CH) 1 (ul2 represents an integer of 1 to 6)]
- X 61 represents a straight or branched chain having 1 to 6 carbon atoms.
- R 367 represents a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms or a derivative thereof, or a linear or branched alkyl group having 1 to 4 carbon atoms, and R 365 and R 366 are independent of each other.
- X 61 includes a plurality of different groups.
- R 37 represents a hydrogen atom or a methyl group.
- R 373 represents a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms or a derivative thereof, or a linear or branched alkyl group having 1 to 4 carbon atoms, and R and R 372 are each independently hydrogen. Represents an atom or a linear or branched alkyl group having 1 to 4 carbon atoms, or is!
- R 371 and R 373 or R 372 and R 37 3 are bonded to each other, and Together with a carbon atom, a divalent alicyclic hydrocarbon group having 4 to 20 carbon atoms or a derivative thereof, and the remaining one of R and R 372 that has not been involved in the bond is a hydrogen atom.
- R 38 represents a hydrogen atom or a methyl group.
- R 381 , R 382 and R 383 each independently represent a linear or branched alkyl group having 1 to 4 carbon atoms.
- R 1 in the formula (3-1 1) is preferably a methyl group, an ethyl group, or an isopropyl group from the viewpoint of sensitivity and resolution.
- Nl in formula (3-1-1) is preferably 0 from the viewpoint of high dry etching resistance.
- R 2 and R 3 are preferably each independently a methyl group, an ethyl group, or an isopropyl group from the viewpoint of sensitivity and resolution.
- N2 in the formula (3-2-1) is preferably 0 from the viewpoint of high dry etching resistance.
- R 4 in the formula (3-3-1) is preferably a methyl group, an ethyl group, or an isopropyl group from the viewpoint of sensitivity and resolution.
- Z 1 and Z 2 are each independently preferably CH or CH CH independently from the viewpoint of high dry etching resistance.
- R 331 , R 332 , R 333 , and R 334 in formula (3-3-1) are each independently a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group because of their high solubility in organic solvents. It is preferable that
- N3 in formula (3-3-1) is preferably 0 from the viewpoint of high dry etching resistance.
- Q in the formula (3-3-1) is preferably 1 from the viewpoint of high dry etching resistance, and preferably 0 from the viewpoint of good solubility in an organic solvent.
- R 5 in the formula (3-4 1) is preferably a methyl group, an ethyl group, or an isopropyl group from the viewpoint of sensitivity and resolution! /.
- N4 in formula (3-4-1) is preferably 0 from the viewpoint of high dry etching resistance.
- R in the formula (3-4-1) is preferably 1 from the viewpoint of high dry etching resistance, and preferably 0 from the viewpoint of good solubility in an organic solvent.
- Z 3 and Z 4 in formula (3-5-1) each have high dry etching resistance, and are preferably independently CH or CH 2 CH 3 respectively.
- R 352 , R 353 , and R 354 in formula (3-5-1) are each independently a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group because of their high solubility in organic solvents. It is preferable that it exists.
- N51 in the formula (3-5-1) is preferably 0 from the viewpoint of high dry etching resistance.
- Q3 in the formula (3-5-1) is preferably 1 in view of high dry etching resistance, and is preferably 0 in view of good solubility in an organic solvent.
- One C (R 355 ) (R 356 ) (R 357 ) in the formula (3-5-1) is excellent in line edge roughness, and the following formulas (K-1) to (K-6)
- the structure represented by the formula ( ⁇ —7) to ( ⁇ —17) is preferred in terms of the high dry etching resistance V, which is preferable.
- R 362 , R ⁇ , and R 364 in formula (3-6-1) are each independently a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group because of their high solubility in organic solvents. It is preferable that it exists.
- N61 in Formula (3-6-1) is preferably 0 because of its high resistance to dry etching.
- Q4 in the formula (3-6-1) is preferably 0 in view of high dry etching resistance, and is preferably 0 in view of good solubility in an organic solvent.
- One C (R 365 ) (R 366 ) —O—R 367 in the formula (3-6-1) is excellent in line edge roughness, and the following formulas CF-l) to Ci 24)
- the structure represented by the formula (1) has a high dry etching resistance, and the structure represented by the following formulas CF 25) to CF 52) is preferred.
- One C (R) (R) -O-R in the formula (3-7-1) is expressed by the above formulas CF-l) to Ci 24) in that the line edge roughness is excellent.
- the structure represented by the above formula (J1-25) to (! 152) is preferred.
- the structural unit (B) having an acid leaving group can be used alone or in combination of two or more as required.
- a polymer having a structural unit (B) having an acid leaving group is produced by polymerizing a monomer containing the monomer (b) that gives the structural unit (B) having an acid leaving group. can do.
- the monomer (b) is not particularly limited, and examples thereof include monomers represented by the following formulas (91) to (9224).
- R and R ′ each independently represents a hydrogen atom or a methyl group.
- Monomer, monomers represented by the above formulas (976) to (988), monomers represented by the above formulas (9130) to (9135), and the above formulas (9147) to (9 157), monomers represented by the above formulas (9 171) to (9 183), and geometrical and optical isomers thereof are more preferable.
- monomers represented by the above formulas (9441) to (9551), monomers represented by the above formulas (9663) to (975), Monomers represented by the above formulas (989) to (9101), monomers represented by the above formulas (9136) to (9146), and the above formulas (9158) to (9-170) ), Monomers represented by the above formulas (9 184) to (9-196), and geometrical and optical isomers thereof are more preferred.
- monomers represented by the above formulas (9-197) to (9-224), and geometric isomers and optical isomers thereof are more preferable.
- hydrophilic group means C (CF 3) 2 -OH, hydroxy group, cyano group, methoxy group,
- At least one of a boxy group and an amino group At least one of a boxy group and an amino group.
- the structural unit (C) having a hydrophilic group is effective in reducing the diffetat of the resist composition and improving the pattern rectangularity.
- the structural unit (C) When the structural unit (C) has a group that is decomposed or eliminated by the action of an acid, it tends to have better sensitivity. In this case, the structural unit (C) also corresponds to the structural unit ( ⁇ ). However, in the present invention, such a structural unit is regarded as a structural unit ( ⁇ ).
- the structural unit (C) when the structural unit (C) has an Ra skeleton, it tends to have better sensitivity.
- the structural unit (C) also corresponds to the structural unit ( ⁇ ).
- such a structural unit is regarded as a structural unit ( ⁇ ). .
- structural unit having a hydrophilic group (C) is particularly limited Do ⁇ , terms de dry etching resistance is high which is required to resist the following formula (5 one: L)! ⁇ (5- 7) It is preferably at least one selected from the group consisting of forces.
- R bl represents a hydrogen atom or a methyl group
- R bU1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms
- X 51 represents a carbon atom having 1 to 6 carbon atoms.
- the straight-chain or branched alkyl group having 1 to 6 carbon atoms includes 1 C (CF 3) —OH, hydroxy group, cyano group, carboxy group, and acyl group having 1 to 6 carbon atoms as a substituent.
- n51 represents an integer of 1 to 4.
- X 51 includes a plurality of different groups.
- R 52 represents a hydrogen atom or a methyl group
- X 52 represents a linear or branched alkyl group having 1 to 6 carbon atoms, —C (CF 3) 2 -OH, hydroxy Group, cyano group, carboxy group, charcoal
- 1 to 6 prime acyl groups 1 to 6 alkoxy groups, or 1 to 6 alcohols.
- the straight or branched alkyl group having 1 to 6 carbon atoms is substituted with —C (CF 3) 2 —OH, hydroxy group, cyan group, carboxy group.
- n52 represents an integer of 1 to 4.
- X 52 includes a plurality of different groups.
- R 53 represents a hydrogen atom or a methyl group
- R 5Q2 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms
- R 531 to R 534 each independently represents a hydrogen atom.
- Each W 2 independently represents —O—, —S—, —NH or a methylene chain having a chain length of 1 to 6 [(CH 2) — (u2 represents an integer of 1 to 6)],
- X 53 is a linear or branched alkyl group having 1 to 6 carbon atoms, C (CF 3) 2 -OH, hydroxy group
- the straight-chain or branched alkyl group having 1 to 6 carbon atoms includes 1 C (CF 3) 2 -OH, hydroxy group, cyano group, carboxy group, 1 to 6 carbon atoms as a substituent.
- X 53 may have at least one group selected from the group consisting of a sil group, a carboxy group esterified with an alcohol having 1 to 6 carbon atoms, and an amino group.
- ql represents 0 or 1.
- X 53 includes a plurality of different groups.
- R 54 represents a hydrogen atom or a methyl group
- R 5Q3 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms
- X 54 represents a straight chain having 1 to 6 carbon atoms. Chain or branched alkyl group, —C (CF) —OH, hydroxy group, cyano group, carboxy group, acyl group having 1 to 6 carbon atoms, carbon
- the straight-chain or branched alkyl group having 1 to 6 carbon atoms includes 1 C (CF 3) —OH, hydroxy group, cyano group, carboxy group, and acyl group having 1 to 6 carbon atoms as a substituent.
- n54 represents an integer of 1 to 4
- rl represents an integer of 0 to 2.
- X 54 includes a plurality of different groups.
- R 55 represents a hydrogen atom or a methyl group
- R 5 ° 4 and R 5 ° 5 each independently represents an alkyl group having 1 to 3 carbon atoms
- X 55 represents Straight or branched alkyl group having 1 to 6 carbon atoms, C (CF) -OH, hydroxy group, cyano group, carboxy group, acyl having 1 to 6 carbon atoms
- an alkoxy group having 1 to 6 carbon atoms an alkoxy group having 1 to 6 carbon atoms, a carboxyl group or an amino group esterified with an alcohol having 1 to 6 carbon atoms.
- substituent having 1 to 6 carbon atoms 1 C (CF 3) 2 -OH, hydroxy group, cyano group, carboxy group, 1 to 6 carbon atoms
- n55 represents an integer of 1 to 4.
- X 55 includes a plurality of different groups.
- R 56 represents a hydrogen atom or a methyl group, represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and R 535 to R 536 independently represent a hydrogen atom or a carbon atom.
- R 535 to R 536 independently represent a hydrogen atom or a carbon atom.
- W 3 represents —O—, —S—, —NH—, or a methylene chain having a chain length of 1 to 6 [(CH 3) 1 (u3 is an integer of 1 to 6
- X 56 represents 1 to 6 carbon atoms.
- the straight chain or branched alkyl group having 1 to 6 carbon atoms includes C (CF 3) 2 -OH, hydroxy group, and cyan group as a substituent.
- a carboxy group, an acyl group having 1 to 6 carbon atoms, a carboxy group esterified with an alcohol having 1 to 6 carbon atoms, and an amino group may have at least one group selected from the group consisting of: n56 represents an integer of 1 to 4, and q2 represents 0 or 1. In addition, when n56 is 2 or more, X 56 includes a plurality of different groups.
- R 57 represents a hydrogen atom or a methyl group
- R 571 represents a straight or branched alkyl group having 1 to 6 carbon atoms
- hydrocarbon group or indicates a linear or branched alkyl group having 1 to 6 carbon atoms having a bridged cyclic hydrocarbon group having 4 to 16 carbon atoms
- R 572 is a straight-chain or branched having 1 to 6 carbon atoms
- An alkyl group or R 571 and R 572 may be combined together to form a bridged cyclic hydrocarbon group having 4 to 16 carbon atoms together with the carbon atom to which each is bonded.
- the alkyl group is a hydroxy group
- a bridged cyclic hydrocarbon group that may have a boxy group, an acyl group having 2 to 6 carbon atoms, or a carboxy group esterified with an alcohol having 1 to 6 carbon atoms is a straight chain having 1 to 6 carbon atoms.
- the alkyl group, which may have a branched alkyl group has a hydroxyl group, a carboxy group, a C 2-6 acyl group or an esterified force loxy group with a C 1-6 alcohol. You may do it.
- X 57 is a linear or branched alkyl group having 1 to 6 carbon atoms, —C (CF) —OH, hydroxy group, cyano group, carboxy group, or acyl group having 1 to 6 carbon atoms.
- the linear or branched alkyl group having 1 to 6 carbon atoms is a C (CF) -OH, hydroxy group, cyano group, carboxy group, or 1 to 6 carbon atoms as a substituent.
- R 5Q1 in formula ( 5-1 ) is a hydrogen atom because of its good solubility in an organic solvent, which is preferably a methyl group, an ethyl group, or an isopropyl group, from the viewpoint of sensitivity and resolution. It is preferably an atom.
- R 5Q2 in formula ( 5-3 ) is a hydrogen atom because of its good solubility in an organic solvent, which is preferably a methyl group, an ethyl group, or an isopropyl group, from the viewpoint of sensitivity and resolution. It is preferably an atom.
- H is preferably one.
- R 532 , R 533 , and R 534 are highly soluble in organic solvents, Each independently is preferably a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group.
- N53 in formula (5-3) is preferably 1 from the viewpoint of high dry etching resistance, and ⁇ ⁇ in formula (5-3) is -C (CF) from the point of good pattern shape -OH, hydroxy
- Ql in the formula (5-3) is preferably 1 from the viewpoint of high dry etching resistance, and is preferably 0 from the viewpoint of good solubility in an organic solvent.
- R 5Q3 in formula ( 5-4 ) is a hydrogen atom because of its good solubility in an organic solvent, which is preferably a methyl group, an ethyl group, or an isopropyl group, from the viewpoint of sensitivity and resolution. It is preferably an atom.
- rl is preferably 1 because of its high resistance to dry etching, and it is preferably 0 because of its good solubility in organic solvents.
- R 5M and R 5Q5 are each independently preferably a methyl group, an ethyl group, or an isopropyl group from the viewpoint of sensitivity and resolution.
- R 5Q6 in formula (5-6) is a hydrogen atom because of its good solubility in an organic solvent, which is preferably a methyl group, an ethyl group, or an isopropyl group, from the viewpoint of sensitivity and resolution. It is preferably an atom.
- W 3 in formula (5-6) is highly resistant to dry etching.
- R 535 and R Mb in formula (5-6) are preferably a hydrogen atom, a methyl group, an ethyl group, or an isopropyl group from the viewpoint of high solubility in an organic solvent.
- Q2 in the formula (5-6) is preferably 1 from the viewpoint of high dry etching resistance, and is preferably 0 from the viewpoint of good solubility in an organic solvent.
- R 571 and R 572 in the formula (5-7) have high dry etching resistance, so that R 571 and R 572 are bonded together to form a carbon atom with 4 carbon atoms bonded to each other. Structures forming ⁇ 16 bridged cyclic hydrocarbon groups are preferred. In addition, because of the excellent heat resistance and stability, R 571 and R 572 are combined together, and the cyclic force contained in the bridged cyclic hydrocarbon group formed together with the carbon atom to which each is bonded.
- It preferably has a ring, an adamantane ring, a norbornane ring, a pinane ring, a bicyclo [2.2.2] octane ring, a tetracyclododecane ring, a tricyclodecane ring, or a decahydronaphthalene ring.
- X 57 in formula (5-7) is from the point that the pattern shape is good, -CH -C (CF) -OH,-
- the structural unit (C) having a hydrophilic group can be used alone or in combination of two or more as necessary.
- the polymer having the structural unit (C) having a hydrophilic group is a structural unit having a hydrophilic group (
- Monomer which gives C) It can be produced by polymerizing a monomer containing (c).
- the monomer (c) is not particularly limited, and examples thereof include monomers represented by the following formulas (13-1) to (13-79).
- R represents a hydrogen atom or a methyl group.
- the polymer (Y) has the structural units (A) to (C) described above and a structural unit (E) described later, but the structural units (D) other than these structural units are included.
- a structural unit (D) for example, a structural unit (D1) having an alicyclic skeleton (nonpolar alicyclic skeleton) that does not have an acid-eliminable group and a hydrophilic group can be contained.
- the alicyclic skeleton is a skeleton having at least one cyclic saturated hydrocarbon group.
- the structural unit (D1) one type may be used, or two or more types may be used in combination as required.
- the structural unit (D1) tends to exhibit the effect of developing the dry etching resistance of the resist composition.
- the structural unit (D1) is not particularly limited, but is expressed by the following formulas (11-1) to (11-4) from the viewpoint that the dry etching resistance required for the resist is high!
- the structural unit is preferred ⁇
- n301 represents an integer of 0 to 4.
- X 3Q1 includes a plurality of different groups.
- R 3Q2 represents a hydrogen atom or a methyl group
- X 3Q2 represents a linear or branched alkyl group having 1 to 6 carbon atoms
- n302 represents an integer of 0 to 4.
- n302 is 2 or more, it includes having a plurality of different groups as X 3 ° 2 .
- R 3Q3 represents a hydrogen atom or a methyl group
- X ⁇ is a straight chain having 1 to 6 carbon atoms.
- n303 represents the integer of 0-4.
- P represents an integer of 0-2.
- R 3M represents a hydrogen atom or a methyl group
- X 3M represents a linear or branched alkyl group having 1 to 6 carbon atoms
- n304 represents an integer of 0 to 4.
- n304 is 2 or more, it includes having a plurality of different groups as X 3 ° 4 .
- Pi represents an integer from 0 to 2.
- the position where X 3M , X 3 ° 2 , X 3 ° 3 and X 3 ° 4 are bonded may be anywhere in the ring structure.
- n301 is preferably 0 from the viewpoint of high dry etching resistance.
- N302 in the formula (11-2) is preferably 0 from the viewpoint of high dry etching resistance.
- N303 in the formula (11-3) is preferably 0 because of its high resistance to dry etching.
- p is preferably 0 from the viewpoint of high solubility in an organic solvent, and is preferably 1 from the viewpoint of high dry etching resistance.
- N304 in the formula (11-4) is preferably 0 because of its high dry etching resistance.
- pi is preferably 0 from the viewpoint of high solubility in an organic solvent, and is preferably 1 from the viewpoint of high dry etching resistance.
- the monomer (dl) having a nonpolar alicyclic skeleton is added to the monomers (a) to (c) described above. ) And copolymerize!
- the monomer (dl) having a nonpolar alicyclic skeleton can be used alone or in combination of two or more as required.
- R represents a hydrogen atom or a methyl group.
- the polymer (Y) may further have a structural unit (D2) other than the above.
- the monomer (d2) may be copolymerized with the monomers (a) to (c) described above.
- Monomer (d2) can be used alone or in combination of two or more as required.
- the monomer (d2) is not particularly limited, and examples thereof include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and n-propyl (meth) acrylate.
- Unsaturated carboxylic acids and carboxylic acid anhydrides such as (meth) acrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride;
- Examples include ethylene, propylene, norbornene, tetrafluoroethylene, acrylamide, N-methyl acrylamide, ⁇ , ⁇ -dimethyl acrylamide, butyl chloride, butyl fluoride, vinylidene fluoride, butylpyrrolidone, and the like.
- the content of the structural unit (D1) and the structural unit (D2) is not particularly limited, but a range of 20 mol% or less is preferable in the total number of the structural units of the resist polymer ( ⁇ ,).
- Tables 1 to 4 list preferred and combinations of the structural unit ( ⁇ ⁇ ) and the structural unit ( ⁇ ) in the polymer ( ⁇ ).
- Structural unit A) Structural unit (B) Structural unit (A) Structural unit (B)
- Structural unit A) Structural unit (B) Structural unit (A) Structural unit (B)
- Structural unit A) Structural unit (B) Structural unit (A) Structural unit (B)
- Structural unit A) Structural unit (B) Structural unit (A) Structural unit (B)
- the structural unit (A) includes at least one selected from the group consisting of the formula (10-1) and the formula (10-3), and the formula (10-7), (10-8). ), (10-10), (10-12), (10-17) and one or more selected from the group consisting of the above formulas (10-19) may be used in combination. Further, in addition to the combinations listed in Table 1, as the structural unit (C), the formula (13-1), the formula (13-26), the formula (13-27), the formula (13-30) Also preferred is a combination (hereinafter referred to as “combination A”) in which one monomer selected from the group consisting of formula (13-31) and formula (13-68) is added. Then, for the combinations listed in Table 1, or for the combination A, as the structural unit (D1), one or more selected from the group consisting of the above formula (14-1) and the above formula (14-3) A combination of monomers is also preferred.
- the structural unit (E) will be described.
- the structural unit (E) is a structural unit having the structure of the following formula (1).
- L is a linear, branched, or cyclic divalent hydrocarbon group having 1 to 20 carbon atoms, and the divalent hydrocarbon group includes a substituent and Z or hetero.
- R 11 is a linear, branched, or cyclic g-valent hydrocarbon group having 1 to 20 carbon atoms, and the g-valent hydrocarbon group includes a substituent and Z Or may have a heteroatom, g represents an integer of 1 to 24.
- the divalent hydrocarbon group includes a methylene group, an ethylene group, a propylene group, an isopropylene group, an n-butylene group, a sec butylene group, a pentylene group, and a neo pentylene group.
- Straight chain, branched or cyclic hydrocarbon groups such as octylene group, norene group, decylene group, cyclopentylene group and cyclohexylene group.
- L in formula (1) is preferably a linear, branched, or cyclic divalent hydrocarbon group having 1 to 6 carbon atoms from the viewpoint that the introduction rate during polymerization can be increased.
- a straight-chain, branched or cyclic divalent hydrocarbon group having 1 to 4 carbon atoms is more preferable, and a hydrocarbon group having 2 carbon atoms is more preferable.
- R 11 in the formula (1) when g is 1 or 2, is a linear, branched or cyclic g having 1 to 10 carbon atoms from the viewpoint of increasing the introduction rate during polymerization. It is preferably a valent hydrocarbon group, more preferably a linear, branched, or cyclic g-valent hydrocarbon group having 1 to 4 carbon atoms, and these g-valent hydrocarbon groups are substituents. And have Z or heteroatoms R 11 in the formula (1) is a linear, branched, or cyclic g-valent hydrocarbon group having 1 to 12 carbon atoms from the viewpoint of good line edge roughness when g is 3 to 24. It is preferred that these g-valent hydrocarbon groups have substituents and Z or heteroatoms. G in the formula (1) is preferably 3 to 8 from the viewpoint that the line edge roughness 1 or 2 is preferable from the viewpoint that the introduction rate during the polymerization can be increased.
- the “substituent” means a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, a thiol group, a hydroxy group, a carboxy group, or an acyl group having 1 to 6 carbon atoms.
- the “heteroatom” is a sulfur atom, a nitrogen atom, an oxygen atom, or a phosphorus atom.
- the linear, branched or cyclic alkyl group having 1 to 6 carbon atoms of the "substituent” is a thiol group, a hydroxy group, a carboxy group, an acyl group having 1 to 6 carbon atoms, or a carbon number of 1 Carboxy group esterified with alcohol of ⁇ 6, carboxy group esterified with thiol having 1 to 6 carbon atoms, cyano group, amino group, halogen and -toxy group You may have a group.
- examples of the hetero atom contained in L or R 11 include a sulfur atom, a nitrogen atom, an oxygen atom, and a phosphorus atom. At this time, the bond coming out of the heteroatom varies depending on the valence of the heteroatom.
- R 11 examples include structures represented by the following formulas (6-1) to (6-198). It does not mean that one O—C (O) —L—O is bonded to all of the bonds, but the remaining bond after the bonding of the hydrogen atom or the above substituent is O—C (O). — Combines with LO—.
- the content of the structural unit (E) is 0.3 mol% or more in the total number of structural units of the resist polymer ( ⁇ ′).
- the content of the structural unit ( ⁇ ) is 0.3 mol% or more, it has the effect of improving the handling property of the wet powder obtained by reprecipitation, and the storage stability of the resist composition. It has the effect of improving and further improving the resist pattern rectangularity.
- the polymer containing the structural unit (C) has a handleability of the wet powder when reprecipitated. Although it tends to deteriorate and become a soot-like material, even when the structural unit (C) is used, if the content of the structural unit (E) is 0.3 mol% or more, The handleability is remarkably improved. Further, in combination with the structural unit (C), if the content of the structural unit (E) is 0.3 mole 0/0 or more, the pattern rectangularity of the resist is particularly good.
- the lower limit of the content of the structural unit) is not particularly limited, but is preferably 0.35 mol% or more, more preferably 0.4 mol% or more.
- the upper limit of the content of the structural unit (E) is not particularly limited, but is preferably 8 mol% or less, more preferably 6 mol% or less, more preferably 4 mol% or less, and even more preferably 3 mol% or less. Is particularly preferred.
- a monomer containing the monomers (a) to (c) described above in a polymerization solvent containing the hydroxy group-containing ester (e) is used. It can be produced by polymerizing the body.
- the polymerization of the monomers (a) to (c) described above is carried out by radical polymerization.
- radical polymerization however, the polymerization initiator is first decomposed by heat or the like to generate radicals, and this radical Monomer chain polymerization proceeds from the starting point of the monomer. Thereafter, a polymer having a radical at the growth end is generated.
- the radical at the growth end pulls out the hydrogen of the hydroxy group, and the polymer at the growth end is deactivated. Become.
- the hydroxy group-containing ester (e) from which hydrogen has been extracted becomes a radical-containing structure, that is, a radical body, and this radical body serves as a starting point to promote chain polymerization or recombine with the polymer radical.
- a hydroxy group-containing ester (e) residue (constituent unit (E)) is incorporated into the structure of the obtained polymer. That is, since the hydroxy group-containing ester has chain transfer properties, it has the effect of introducing the structural unit (E) having the structure of the formula (1) into the polymer.
- the structural unit) is incorporated into the polymer. Since the chain transfer reaction to the hydroxy group-containing ester (e) occurs in competition with the chain polymerization of the monomer, When the monomer containing the monomer (a) to (c) is polymerized in the polymerization solvent containing the ester (e), the structural unit (A), the structural unit), the structural unit ( C), and the polymers (Y) and (Y) having the structural unit (E) together with the structural unit (A) and the structural unit (B)
- the resist polymer ( ⁇ ') obtained in this way is generally a polymer ( ⁇ ), a polymer.
- an ester having one hydroxy group is used as a polymerization solvent, as described above, a polymer having a structural unit ( ⁇ ) at one or both ends can be obtained.
- the structural unit ( ⁇ ) consisting only of the polymer having the structural unit ( ⁇ ) at one end or both ends is a part of the polymer chain (not the end). ) Is also obtained.
- an ester having 3 or more hydroxy groups is used as a polymerization solvent, a structural unit (
- a star-shaped polymer centering on the structural unit ( ⁇ ) consisting only of the polymer having ⁇ ) can also be obtained.
- the hydroxy group-containing ester (e) is not particularly limited, and examples thereof include those represented by the general formula (2).
- R and R each independently represents a linear or branched alkyl group having 1 to 20 carbon atoms which may have a hydroxy group, and the total number of hydroxy groups contained in R 21 and R 22 is 1 or less. Above.
- the straight chain or branched alkyl group preferably has 1 to 6 carbon atoms.
- R represents a linear or branched alkyl group having 1 to 6 carbon atoms.
- Formula (e-11) is an example of lactate
- formulas (e-12) and (e-13) are examples of hydroxybutyrate
- formula ( e -14) is hydroxyiso
- butyric acid ester formula (e-15) is an example of hydroxyisovaleric acid ester
- formula (e-16) is an example of hydroxypropionic acid ester.
- Particularly preferred are ethyl acetate and butyl lactate in that the resist composition having a large chain transfer capability (chain transfer constant) has a small defatt.
- the compounds represented by the formulas (7-3), (7-14), and (7-21) can be synthesized by the following schemes, respectively, and are not limited to this scheme.
- the hydroxy group-containing ester (e) since the hydroxy group-containing ester (e) has chain transfer properties, it also has an effect of reducing the molecular weight of the polymer. Therefore, a polymer (Y) obtained by polymerization in a polymerization solvent containing the hydroxy group-containing ester (e) can be obtained with a narrow molecular weight distribution (Mw / Mn). Therefore, the resist polymer ( ⁇ ′) containing the polymer (Y) is a polymer having a low molecular weight, a narrow molecular weight distribution, and a structural unit ( ⁇ ) (hydrophilic group called an ester group) in the polymer. Since (ii) is contained, when the resist composition or resist film is formed, the entanglement between the polymers is limited to some extent, and as a result, it tends to be excellent in differential and line edge roughness.
- the molecular weight distribution of the resist polymer ( ⁇ ') containing the polymer ( ⁇ ) is not particularly limited. 85-1. 0 range force is preferred, 1. 8 to 1. 2 force is preferred! / ⁇ .
- the weight average molecular weight of the resist polymer ( ⁇ ') is not particularly limited, but is preferably 1,000 or more from the viewpoint of dry etching resistance and resist pattern shape. A certain force is preferable, a force of 4,000 or more is particularly preferable, and a value of 5,000 or more is more preferable.
- the weight average molecular weight of the resist polymer of the present invention is preferably 100,000 or less, more preferably 50,000 or less, from the viewpoint of solubility in resist solution and resolution.
- the line edge roughness and skirting are particularly preferred, with 15,000 or less being particularly preferred.
- the mass average molecular weight is most preferably 12,000 or less.
- the resist polymer ( ⁇ ') containing the polymer ( ⁇ ) has a low molecular weight and a narrow molecular weight distribution without using a sulfur-containing chain transfer agent as described above.
- the storage stability of the resist composition tends to be excellent.
- the resist polymer ( ⁇ ') of the present invention contains the monomer (a) and the monomer (b) in a polymerization solvent containing 25% by mass or more of the hydroxy group-containing ester (e). And a monomer containing the monomer (c).
- the polymerization method is not particularly limited, but it may be produced by radical polymerization from the viewpoint of reducing the production cost and impurities in the polymer, and introducing the structural unit (E) into the polymer.
- radical polymerization from the viewpoint of reducing the production cost and impurities in the polymer, and introducing the structural unit (E) into the polymer.
- the polymerization is carried out by solution polymerization.
- the content of the hydroxy group-containing ester (e) is 25% by mass or more.
- a resist polymer ( ⁇ ′) in which the content of the structural unit (E) is 0.3 mol% or more can be obtained. In this case, the handling property of the wet powder tends to be good.
- the preferred content and range of the hydroxy group-containing ester (e) depends on the type of hydroxy group-containing ester (e), the weight average molecular weight of the resist polymer ( ⁇ ') to be produced, and finally There is an optimum range depending on the solid content of the polymerization solution, the polymerization temperature, and the like.
- the solid content concentration of the polymer solution finally obtained by solution polymerization is preferably 20% by mass or more from the viewpoint of the yield of the resist polymer ( ⁇ ′) obtained by reprecipitation. Moreover, 60 mass% or less is preferable from the surface of the viscosity of a polymerization solution. In this solid content range, a polymer (Y) having a constituent unit (E) content of 0.3 mol% or more at a polymerization temperature of 80 ° C. at a lower limit (20% by mass) of the solid content concentration.
- the content of the hydroxy group-containing ester (e) is preferably 25% by mass or more, and at the upper limit of the solid content concentration (60% by mass), the content of the hydroxy group-containing ester (e) is 75% by mass. % Or more is preferred.
- the content of the hydroxy-containing ester (e ), 45% by mass or more is preferred.
- the solid concentration of the polymer solution finally obtained by solution polymerization is preferably 25% by mass or more, and from the viewpoint of the viscosity of the polymerization solution, it is preferably 65% by mass or less.
- the content of the hydroxy group-containing ester (e) is preferably 30% by mass or more. At the upper limit of the solid content concentration (65% by mass), the content of the hydroxy group-containing ester (e) is 80 mass% or more is preferable.
- the content of the hydroxy-containing ester ( e ) should be 55% by mass or more.
- the solid content concentration of the polymer solution finally obtained by solution polymerization is preferably 30% by mass or more, and from the aspect of the viscosity of the polymerization solution, it is preferably 70% by mass or less.
- the polymerization temperature is 80 ° C at the lower limit (30% by mass) of the solid content concentration.
- the hydroxy group-containing ester (e) content is preferably 40% by mass or more, and the solid content concentration In the upper limit (70% by mass), the content of the hydroxy group-containing ester (e) is preferably 85% by mass or more.
- the content of the hydroxy-containing ester ( e ) is preferably 55% by mass or more.
- the polymerization solvent used together with the hydroxy group-containing ester (e) is not particularly limited, but a solvent capable of dissolving any of the monomer, the polymerization initiator, and the polymer (referred to as an organic solvent A) is preferable.
- organic solvent A a solvent capable of dissolving any of the monomer, the polymerization initiator, and the polymer
- examples of such an organic solvent include 1,4 dioxane, isopropyl alcohol, acetone, tetrahydrofuran (hereinafter referred to as “THF”), methyl ethyl ketone (hereinafter referred to as “MEK”), methyl isobutyl ketone (hereinafter referred to as “THF”).
- MIBK is a butyrolatatone
- PGMEA propylene glycol monomethyl ether acetate
- PGME propylene glycol monomethyl ether
- the polymerization method of the solution polymerization is not particularly limited, and may be batch polymerization or dropping polymerization.
- a polymerization method called dropping polymerization in which a monomer is dropped into a polymerization vessel is preferable because a polymer having a narrow composition distribution and Z or molecular weight distribution can be easily obtained.
- the monomer to be dropped may be a monomer alone or a solution obtained by dissolving the monomer in an organic solvent.
- an organic solvent is prepared and charged into a polymerization vessel (this organic solvent is also referred to as a “charged solvent”), heated to a predetermined polymerization temperature, and then a monomer or polymerization initiator is added.
- a solution dissolved in an organic solvent (this organic solvent is also referred to as “dropping solvent”) is dropped into the charged solvent.
- the monomer may be added dropwise without dissolving it in the dropping solvent.
- the polymerization initiator may be dissolved in the monomer, and a solution in which only the polymerization initiator is dissolved in the organic solvent. It may be dropped into an organic solvent.
- a monomer or a polymerization initiator may be dropped into the polymerization vessel in a state where the charged solvent is not in the polymerization vessel.
- the monomer and the polymerization initiator may be dripped directly into the charged solvent heated to a predetermined polymerization temperature, respectively, or heated to a predetermined polymerization temperature from an independent storage tank. Mix immediately before dropping into the prepared solvent, and drop into the prepared solvent.
- the timing at which the monomer or the polymerization initiator is dropped into the charged solvent may be delayed after the monomer is dropped first, or the polymerization initiator may be dropped first. After that, the monomer may be dropped with a delay, or the monomer and the polymerization initiator may be dropped at the same timing. Further, these dropping speeds may be constant until the dropping is completed, or may be changed in multiple stages according to the consumption speed of the monomer and the polymerization initiator, or intermittently. The dripping may be stopped or started.
- the polymerization temperature in the drop polymerization method is not particularly limited, but it is usually preferably in the range of 50 to 150 ° C.
- the amount of the polymerization solvent used is not particularly limited, and may be determined as appropriate. Usually, it is preferable to use within a range of 30 to 700 parts by mass with respect to 100 parts by mass of the total amount of monomers used for copolymerization.
- the resist polymer ( ⁇ ′) in which the content of the structural unit (E) is 0.3 mol% or more tends to have good handleability of the wet powder during reprecipitation.
- the polymerization solvent is used in an amount of 400 parts by mass or less (that is, solids with respect to 100 parts by mass of the total amount of monomers used for copolymerization).
- the concentration is more preferably 20% by mass or more.
- the total amount of the hydroxy group-containing ester (e) to be used may be contained in the dropping solvent, and the total amount of the hydroxy group-containing ester (e) may be contained in the prepared solvent.
- the hydroxy group-containing ester (e) can be in an arbitrary ratio, but the molecular weight distribution can be narrowed.
- the ratio of the hydroxy group-containing ester (e) in the charged solvent is preferably not less than the ratio of the hydroxy group-containing ester (e) in the dropping solvent.
- the monomer concentration of the monomer solution dropped into the organic solvent is not particularly limited, but is preferably in the range of 5 to 50% by mass.
- the amount of the charged solvent is not particularly limited, and may be appropriately determined! Usually, it is preferably used in the range of 30 to 700 parts by mass with respect to 100 parts by mass of the total amount of monomers used for copolymerization.
- the resist polymer ( ⁇ ′) having a content of the structural unit (E) of 0.3 mol% or more tends to improve the handling of wet powder during reprecipitation, Since the yield of the polymer obtained after the precipitation treatment is high, the amount of the charged solvent is 400 parts by mass or less with respect to 100 parts by mass of the total amount of monomers used for the copolymerization, in the same manner as the amount of polymerization solvent used. Is more preferred.
- the polymerization initiator is preferably one that generates radicals efficiently by heat.
- examples of such polymerization initiators include 2,2'-azobisisobuty-tolyl, dimethyl-1,2,2'-azobisisobutyrate, 2,2'-azobis [2- (2-imidazoline Azo compounds such as 2-yl) propane; and organic peracids such as 2,5 dimethyl-2,5-bis (tert-butylperoxy) hexane.
- the polymerization initiator when producing resist polymers for use in ArF excimer laser (wavelength: 193 nm) lithography, the light transmittance of the resulting resist polymer (transmittance for light with a wavelength of 193 nm) is not reduced as much as possible. Therefore, the polymerization initiator preferably has no aromatic ring in the molecular structure. Furthermore, in consideration of safety during polymerization, the polymerization initiator preferably has a 10-hour half-life temperature of 60 ° C or higher.
- the amount of the polymerization initiator used is not particularly limited, but from the viewpoint of increasing the yield of the copolymer, 0.3 mol part or more with respect to 100 mol parts of the total amount of monomers used for the copolymerization. From the point of narrowing the molecular weight distribution of the copolymer in which 1 mol part or more is more preferable, 30 mol parts or less is preferable with respect to 100 mol parts of the total amount of monomers used in the copolymerization.
- chain transfer agent B a chain transfer agent (hereinafter referred to as chain transfer agent B) is used as long as the storage stability of the resist composition is not impaired. ) May be used.
- chain transfer agent B include 1 butanethiol, 2-butanethiol, 1 octanethiol, 1 decanethiol, 1-tetradecanethiol, cyclohexanethiol, 2-methyl-1 propanethiol, and the like.
- ArF excimer laser (wavelength: 193nm)
- the light transmittance of the resulting resist polymer (transmittance for light with a wavelength of 193nm) is not reduced as much as possible.
- the chain transfer agent B preferably has no aromatic ring.
- the polymer solution produced by solution polymerization is a suitable solution with a good solvent such as 1, 4 dioxane, aceton, THF, MEK, MIBK, y-butarate ratataton, PGMEA, PGME, etc.
- a good solvent such as 1, 4 dioxane, aceton, THF, MEK, MIBK, y-butarate ratataton, PGMEA, PGME, etc.
- the polymer is precipitated by dripping into a large amount of poor solvent such as methanol, water, hexane, heptane and the like. This process is generally called reprecipitation and is very effective for removing unreacted monomers and polymerization initiators remaining in the polymerization solution. If these unreacted substances remain as they are, there is a possibility of adversely affecting the resist performance.
- the precipitate is filtered off and sufficiently dried to obtain the polymer of the present invention. Moreover, after filtering off, it can also be used with a wet powder, without drying.
- the produced polymer solution can be used as a resist composition as it is or after diluting with an appropriate solvent. At that time, an additive such as a storage stabilizer may be appropriately added.
- the resist composition of the present invention is obtained by dissolving the resist polymer of the present invention in a solvent.
- the chemically amplified resist composition of the present invention is obtained by dissolving the resist polymer of the present invention and a photoacid generator in a solvent.
- the resist polymer of the present invention may be used alone or in combination of two or more. This polymer solution without separating the polymer from the polymer solution obtained by solution polymerization or the like is used as it is for the resist composition, or the polymer solution is diluted with an appropriate solvent. Alternatively, it can be concentrated and used in resist compositions.
- Examples of the solvent include methyl ethyl ketone, methyl isobutyl ketone, and 2 pentanone.
- Linear or branched ketones such as 2-hexanone; cyclic ketones such as cyclopentanone and cyclohexanone; propylene glycol monoalkyl acetates such as propylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate
- Ethylene glycol monoalkyl ether acetates such as ethylene glycol monomethenoyl etherate acetate and ethylene glycol monoethyl ether acetate
- Propylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoalkyl ethers such as ethylene glycol monoethyl ether; diethylene glycol alkyl ethers such as diethylene glycol dimethyl ether and diethylene glycol monomethyl ether; esters such as Chi le; n - propyl alcohol
- the content of the solvent is usually 200 to 5000 mass% and preferably 300 to 2000 mass% with respect to 100 mass parts of the resist polymer (the polymer of the present invention)! /.
- the resist polymer of the present invention When the resist polymer of the present invention is used for a chemical amplification resist, it is necessary to use a photoacid generator.
- the photoacid generator contained in the chemically amplified resist composition of the present invention can be arbitrarily selected from those that can be used as the acid generator of the chemically amplified resist composition.
- the photoacid generator may be used alone or in combination of two or more.
- Examples of such a photoacid generator include form salt compounds, sulfonimide compounds, sulfone compounds, sulfonic acid ester compounds, quinonediazide compounds, diazomethane compounds, and the like. It is done.
- photoacid generators sulfo-salts, ododonium salts, phospho-salts, diazo-salts, pyridi-salts and other salt compounds are preferred.
- trisulfol sulfomumutriflate trisulfol hexahexafluoroantimonate, triphenylsulfo-unnaphthalene sulfonate, (hydroxyphenol) benzenoremethinolesnoremol.
- Tonorensenorephonate Dipheo-Norode-Mutriflate, Dipheo-Rhodenium Pyrenesulfonate, Dipheo-Rhodo-Numdodecyl Benzene Sulfonate, Diphlo-Rhodo-Humhexaphnoroleum Antimonate, ⁇ — Methylphenol disulfosulfonumonafluorobutanesulfonate, tri (tert-butyl) Cylphenol) sulfo-um trifluoromethanesulfonate and the like.
- the content of the photoacid generator is appropriately determined depending on the type of the photoacid generator selected, but is usually 0.1 mass per 100 parts by mass of the resist polymer (the polymer of the present invention). And more preferably 0.5 parts by mass or more. By setting the content of the photoacid generator within this range, a chemical reaction due to the catalytic action of the acid generated by exposure can be sufficiently caused. In addition, the content of the photoacid generator is usually 20 parts by mass or less and more preferably 10 parts by mass or less with respect to 100 parts by mass of the resist polymer (polymer of the present invention). By setting the content of the photoacid generator within this range, the stability of the resist composition is improved, and the occurrence of uneven coating during coating of the composition and scum during development is sufficiently reduced.
- a nitrogen-containing compound may be added to the chemically amplified resist composition of the present invention.
- inclusion of a nitrogen-containing compound further improves the resist pattern shape, stability over time, and the like.
- the cross-sectional shape of the resist pattern is closer to a rectangle, and the resist film is exposed, beta (PEB) after exposure, and left for several hours before the next development process.
- the deterioration of the cross-sectional shape of the resist pattern is further suppressed when such leaving (aging) occurs.
- any known amine can be used, and among them, a secondary lower aliphatic amine and a tertiary lower aliphatic amine are more preferable.
- lower aliphatic amine refers to an alkyl or alkyl alcohol amine having 5 or less carbon atoms.
- tertiary lower aliphatic Amin for example, trimethylamine emissions, Jechiruamin, Toryechiruamin, di n - Puropiruamin, Tory n- Puropiruami down, tripentyl Rua Min, diethanol ⁇ Min, triethanol Amamine etc. are mentioned.
- tertiary alkanolamines such as triethanolamine are more preferred.
- the nitrogen-containing compounds may be used alone or in combination of two or more.
- the content of the nitrogen-containing compound is appropriately determined depending on the type of the nitrogen-containing compound selected, but is usually 0.01 mass per 100 mass parts of the resist polymer (the polymer of the present invention). Part or more. By setting the content of the nitrogen-containing compound within this range, the resist pattern shape can be made more rectangular. Further, the content of the nitrogen-containing compound is usually preferably 2 parts by mass or less with respect to 100 parts by mass of the resist polymer (the polymer of the present invention). By setting the content of the nitrogen-containing compound within this range, the sensitivity deterioration can be reduced by / J.
- the chemically amplified resist composition of the present invention may contain an organic carboxylic acid, phosphorus oxoacid, or a derivative thereof. By containing these compounds, it is possible to prevent sensitivity deterioration due to the compounding of the nitrogen-containing compound, and further improve the resist pattern shape, stability with time, and the like.
- organic carboxylic acid for example, malonic acid, succinic acid, malic acid, succinic acid, benzoic acid, salicylic acid and the like are preferable.
- Phosphorus oxoacids or derivatives thereof include, for example, phosphoric acid, phosphoric acid di-n-propyl ester, phosphoric acid diphenyl ester and other derivatives such as phosphoric acid and derivatives thereof; phosphonic acid, Derivatives such as phosphonic acid and esters thereof such as phosphonic acid dimethyl ester, phosphonic acid di-n-butyl ester, phenenophosphonic acid, phosphonic acid diphenole lesole, phosphonic acid dibenzenol ester; phosphinic acid, phenol Examples thereof include phosphinic acids such as sulphinic acid and derivatives such as esters thereof. Among these, phosphonic acid is preferable.
- the content of these compounds is appropriately determined depending on the kind of the selected compound, and is usually a resist polymer (this Polymer of Invention) It is preferably 0.01 parts by mass or more with respect to 100 parts by mass. By setting the content of these compounds within this range, the resist pattern shape can be made more rectangular. In addition, the content of these compounds (organic carboxylic acid, phosphorus oxoacid, or a derivative thereof) is usually 5 parts by mass or less with respect to 100 parts by mass of the resist polymer (the polymer of the present invention). It is preferable. When the content of these compounds is within this range, the film loss of the resist pattern can be reduced. Both the nitrogen-containing compound and the organic carboxylic acid, phosphorus oxoacid, or a derivative thereof may be contained in the chemically amplified resist composition of the present invention, or only one of them may be contained. it can.
- the resist composition of the present invention may contain various additives such as surfactants, other quenchers, sensitizers, antihalation agents, storage stabilizers, antifoaming agents, etc., as necessary. It can also be blended. Any of these additives can be used as long as it is known in the art. Moreover, the compounding quantity of these additives is not specifically limited, What is necessary is just to determine suitably.
- the resist polymer of the present invention can be used as a resist composition for metal etching, photofitting applications, plate making, holograms, color filters, retardation films and the like.
- the resist composition of the present invention is applied to the surface of a substrate to be processed such as a silicon wafer on which a pattern is formed by spin coating or the like. Then, the substrate to be processed coated with the resist composition is dried by baking (pre-beta) or the like to produce a resist film on the substrate.
- the resist film thus obtained is irradiated with light through a photomask (exposure).
- the light used for exposure is KrF excimer laser, ArF excimer laser or F
- Excimer laser is preferred, especially ArF excimer laser. It is also preferable to expose with an electron beam.
- the processed substrate on which the resist pattern has been manufactured is appropriately heat-treated (post-beta) to strengthen the resist and selectively etch portions without the resist.
- the resist is removed with a release agent to obtain a substrate on which a pattern is formed.
- the resist polymer and the resist composition were evaluated as follows.
- the content of the constituent units of the resist polymer (Upsilon ') is - determined by 1 H- NMR measurement in the case where it can be determined by NMR measurement, by such overlapping proton peak determined at 1 ⁇ - ⁇ R measured When it was not possible, it was determined by 13 C-NMR measurement.
- ⁇ H—NMR measurement was performed using a GSX-400 type FT-NMR (trade name) manufactured by JEOL Ltd., and a solution of about 5% by weight of a resist polymer sample (deuterium black outlet). (Form solution or deuterated dimethyl sulfoxide solution) was placed in a test tube with a diameter of 5 mm and the observation frequency was 4 OO MHz and single pulse mode was performed 64 times. The measurement temperature was 40 ° C when deuterated chloroform was used as the solvent, and 60 ° C when deuterated dimethyl sulfoxide was used as the solvent.
- One L—O—R 211 in the structural unit is one CH (CH) —O—CH CH or one CH (CH)
- the content of the structural unit (E) contained in the resist polymer of the present invention is determined by a calculation method described later.
- hydroxy group-containing esters used as a polymerization solvent (e- 11) is, as a configuration unit of the present invention (E), is whether incorporated into the polymer, as described above, the R 211 Oxygen atom This can be confirmed by the presence of a relatively wide single peak (peak width: about 0.1 ppm) at 4.05 to 4.15 ppm, with the adjacent methylene hydrogen (two hydrogen) peaks overlapping.
- the hydroxyl group-containing ester (e-11) itself used as a polymerization solvent may remain in the polymer without being incorporated.
- the remaining hydroxy group-containing es A relatively sharp quadrupole peak derived from tellurium (e-11) (peak width of each quadruple line: about 0.02 pm) is present at the same time, so accurate integration values cannot be obtained. Attention should be paid to. In such a case, the resist polymer to be evaluated needs to be purified again to remove the unreacted hydroxy group-containing ester (e-11).
- the peak integral value corresponding to the number of carbon atoms can be obtained, so that the quantitativeness is improved.
- the peak of L methine carbon in the structural unit (E) exists at 60-61 ppm in the 13 C-NMR ⁇ vector.
- the peaks derived from the structural unit (A), the structural unit (B), the structural unit (C), and the structural unit (D) vary depending on the specific structural unit.
- the power to describe in detail in each component unit, where the peak integral values for one hydrogen or one carbon characteristic of these units are INT, INT, INT, and INT, respectively.
- the content of is as follows.
- INT is INT, INT, INT, INT, INT
- the prepared resist composition solution was spin-coated on a silicon wafer and pre-betaged at 120 ° C. for 60 seconds using a hot plate to produce a resist film having a thickness of 0.4 m.
- beta was performed after exposure at 120 ° C. for 60 seconds using a hot plate.
- development was performed at room temperature using a 2.38 mass% aqueous solution of tetramethylammonium hydroxide, washed with pure water, and dried to produce a resist pattern.
- the exposure amount (mjZcm 2 ) at which the mask of 0.16 / zm line 'and' space pattern was transferred to the line width of 0.16 / zm was measured as sensitivity.
- the minimum dimension ( ⁇ m) of the resist pattern that can be resolved when exposed at the above exposure amount was defined as the resolution.
- the resist sensitivity after standing for 1 week at 40 ° C was measured in the same way as the above method, and calculated as (resist sensitivity after aging) (resist sensitivity immediately after preparation). The amount of change in sensitivity during storage of the resist composition was evaluated.
- the vertical cross section of the above 0.20 m resist pattern was observed with a JS M-6340F field emission scanning electron microscope (trade name) manufactured by JEOL Ltd., and the cross-sectional shape was rectangular. Things were evaluated as ⁇ , convex or concave, and those evaluated as X.
- A-methacryloyloxy ⁇ -petit-mouth rataton represented by the following formula (51) (hereinafter referred to as GBL ⁇ ) 13. 6 parts
- dMA 2-methacryloyloxy 2-methyladamantane
- CNNMA 2 or 3 cyano 5 norbornyl methacrylate (hereinafter referred to as CNNMA) represented by the following formula (53): 8. 2 parts
- the obtained reaction solution was added dropwise to about 10 times amount of methanol with stirring to obtain a white precipitate (resist polymer Y'-1).
- the obtained precipitate was separated by filtration, and again poured into about 10 times the amount of methanol with respect to the reaction solution, and the precipitate was washed while stirring.
- the washed precipitate was filtered off and dried under reduced pressure at 60 ° C. for about 40 hours.
- Table 5 shows a result obtained by measuring properties of the obtained resist polymer Y′-1.
- GBLMA unit corresponding to the structural unit (A) MAdMA unit corresponding to the structural unit (B)
- lactic acid ethyl corresponding to the structural unit (E) Each composition ratio (content) of the unit was calculated by four formula forces based on the peak integration value of 1 H-NMR spectrum shown below.
- OTDMA 47 2.1.0 2 ' 6 ] Decane 3 ON (hereinafter referred to as OTDMA) 47. 2 parts,
- DAIB dimethyl-2,2'-azobisisobutyrate
- Resist polymer Y′-2 was obtained in the same manner as in Example 1. The properties of the precipitate obtained by the reprecipitation operation and the washing operation were excellent in handling without stickiness. Table 5 shows a result obtained by measuring properties of the obtained resist polymer Y′-2.
- OTDMA unit corresponding to the structural unit (A) In the polymer, OTDMA unit corresponding to the structural unit (A), TBMA unit corresponding to the structural unit (B), HAdA unit corresponding to the structural unit (C), and lactic acid corresponding to the structural unit (E).
- composition ratio (content) of the ethyl unit four formula forces based on the peak integrated value of 13 C-NMR spectrum shown below were also calculated.
- Peak integration value of 176 to 178 111 1? ⁇ 1
- Peak integration value of 60 to 61 111 1? ⁇ 1
- Peak integration value from 27 to 29 ppm 3 X INT ⁇ Example 3>
- Resist polymer Y′-3 was obtained in the same manner as in Example 1. The properties of the precipitate obtained by the reprecipitation operation and the washing operation were excellent in handling without stickiness. Table 5 shows a result obtained by measuring properties of the obtained resist polymer Y′-3.
- the OTDA unit corresponding to the structural unit (A), the ECHMA unit corresponding to the structural unit (B), the HAdA unit corresponding to the structural unit (C), and the structural unit (E) phase For each composition ratio (content) of the corresponding lactic acid ethyl unit, four formula forces based on the peak integrated value of 13 C-NMR spectrum shown below were also calculated.
- Peak integration value of 176-178 111 1? ⁇ 1
- Peak integration value of 60 to 61 111 1? ⁇ 1
- HAdMA 1-methacryloyloxy 3-hydroxyadamantane
- Resist polymer Y′-4 was obtained in the same manner as in Example 1. The properties of the precipitate obtained by the reprecipitation operation and the washing operation were excellent in handling without stickiness. Table 5 shows a result obtained by measuring properties of the obtained resist polymer Y′-4.
- GBLMA unit corresponding to the structural unit (A) MAdMA unit corresponding to the structural unit (B), HAdMA unit corresponding to the structural unit (C), and butyl lactate corresponding to the structural unit (E).
- Each composition ratio (content) of the unit was calculated by four formula forces based on the peak integration value of 1 H-NMR spectrum shown below.
- OTDMA56. 7 parts, ECHMA 47.0 parts, HAdMA 28. 3 parts, ethyl lactate 118.8 parts, PGMEA 79.3 parts and DAIB 11.73 parts were added at a constant rate from a dropping device containing a monomer solution. It was dropped into the flask over time. The concentration of ethyl acetate in the polymerization solvent after the dropping was 60% by mass. Thereafter, a temperature of 80 ° C. was maintained for 3 hours.
- Resist polymer Y′-5 was obtained in the same manner as in Example 1. The properties of the precipitate obtained by the reprecipitation operation and the washing operation were excellent in handling without stickiness. Table 5 shows a result obtained by measuring physical properties of the obtained resist polymer Y'-5.
- Each composition ratio (content) of the unit was calculated by four formula forces based on the peak integrated value of 13 C-NMR spectrum shown below.
- Peak integration value of 176-178 111 1? ⁇ 1
- Peak integration value of 60 to 61 111 1? ⁇ 1
- TCDMA Cyclode force-rumetatalylate
- the OTDA unit corresponding to the structural unit (A) in the polymer the MAdMA unit corresponding to the structural unit (B), the HAdA unit corresponding to the structural unit (C), and the TCDMA corresponding to the structural unit (D1).
- Each composition ratio (content) of the ethyl acetate unit corresponding to the unit and the structural unit (E) is sufficiently calculated from the following four formulas based on the peak integral value of 13 C-NMR ⁇ vector shown below. P.
- Peak integration value of 176-178 111 1? ⁇ 1
- Peak integration value of 60 to 61 111 1? ⁇ 1
- Peak integration value of 37-39 111 1? ⁇ 1
- NLA 2-exo-Atallyloyloxy-4-oxatricyclo [4.2.1. 0 3 ' 7 ] nonane 1-one represented by the following formula (61) (hereinafter referred to as NLA) 18. 7 parts
- IAdMA (1-methacryloyloxy 1-methylethyl) adamantane
- DHAdMA 1-methacryloyloxy 3,5 dihydroxyadamantane
- Peak integration value of 176-178 111 1? ⁇ 1
- Peak integration value of 79-81 111 1? ⁇ 1
- Peak integration value of 60 to 61 111 1? ⁇ 1
- Resist was prepared in the same manner as in Example 4 except that PGMEA was used in place of butyl lactate, and 1.31 part of AIBN and 0.56 part of n-octyl mercaptan were used in place of 30 parts of DAIB2.
- Polymer B-2 was obtained.
- the properties of the precipitate obtained by the reprecipitation operation and the washing operation were such that the precipitate hardened in a bowl shape, had a sticky feeling, and was difficult to handle.
- Table 5 shows the results of measurements of physical properties of the resulting resist polymer B-2.
- Resist polymer B-3 was obtained in the same manner as in Example 3, except that PGMEA was used instead of ethyl lactate, and DAIB was 3.91 parts.
- the properties of the precipitate obtained by the reprecipitation operation and the washing operation were such that the precipitate hardened in a bowl shape, had a sticky feeling, and was difficult to handle.
- Table 5 shows the measured physical properties of the resulting resist polymer B-3. did.
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JP2006535753A JP4006472B2 (ja) | 2004-09-10 | 2005-09-06 | レジスト用重合体、レジスト用重合体の製造方法、レジスト組成物、およびパターンが形成された基板の製造方法 |
US11/574,860 US8476401B2 (en) | 2004-09-10 | 2005-09-06 | Resist polymer, process for production thereof, resist composition, and process for production of substrated with patterns thereon |
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US7947421B2 (en) | 2005-01-24 | 2011-05-24 | Fujifilm Corporation | Positive resist composition for immersion exposure and pattern-forming method using the same |
JP2012207217A (ja) * | 2011-03-16 | 2012-10-25 | Sumitomo Chemical Co Ltd | レジスト組成物用樹脂の製造方法 |
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CN1976962A (zh) | 2007-06-06 |
US9188857B2 (en) | 2015-11-17 |
US20130252181A1 (en) | 2013-09-26 |
JP4006472B2 (ja) | 2007-11-14 |
US20080032241A1 (en) | 2008-02-07 |
TWI336708B (en) | 2011-02-01 |
US8476401B2 (en) | 2013-07-02 |
JPWO2006028071A1 (ja) | 2008-05-08 |
TW200617034A (en) | 2006-06-01 |
CN1976962B (zh) | 2010-06-23 |
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