WO2008068903A1 - 半導体リソグラフィー用共重合体とその製造方法 - Google Patents
半導体リソグラフィー用共重合体とその製造方法 Download PDFInfo
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- WO2008068903A1 WO2008068903A1 PCT/JP2007/001353 JP2007001353W WO2008068903A1 WO 2008068903 A1 WO2008068903 A1 WO 2008068903A1 JP 2007001353 W JP2007001353 W JP 2007001353W WO 2008068903 A1 WO2008068903 A1 WO 2008068903A1
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- C—CHEMISTRY; METALLURGY
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- 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
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
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- C08F2/06—Organic solvent
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- C08F12/00—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 an aromatic carbocyclic ring
- C08F12/02—Monomers containing only one unsaturated aliphatic radical
- C08F12/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F12/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
- C08F12/22—Oxygen
- C08F12/24—Phenols or alcohols
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—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 an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
- C08F212/22—Oxygen
- C08F212/24—Phenols or alcohols
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- 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
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- 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
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1811—C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate
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- 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
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
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- C—CHEMISTRY; METALLURGY
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- 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
- C08F220/38—Esters containing sulfur
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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
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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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
- C08F220/283—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
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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
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
- C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
Definitions
- the present invention relates to a lithographic copolymer used in the production of a semiconductor and a method for producing the same. More specifically, it is used for thin film formation such as a resist film, an antireflection film formed on the upper layer or lower layer of the resist film, a gap fill film, a top coat film, etc., used in one lithography process of semiconductor manufacturing.
- the present invention relates to a polymer and a method for producing the same.
- a resist film for transferring a pattern to a substrate is used.
- Various thin films are used as the upper or lower layer of the resist film as required.
- a composition solution is prepared by dissolving a copolymer having a desired function and an additive in an organic solvent, applied to the substrate by a method such as spin coating, and then heated as necessary. Then, it is formed by removing the solvent or curing.
- the resist film is divided into a positive type in which the radiation-irradiated part is dissolved in the developer and a negative type in which the non-radiated part is dissolved in the developer.
- a compound whose solubility in a developer is changed by the action of radiation, and a polymer soluble in an alkaline developer are used as a binder.
- the solubility of the compound that generates acid by the action of radiation hereinafter sometimes referred to as “radiation-sensitive acid generator”
- the solubility in an alkali developer changes by the action of acid.
- a type comprising a copolymer as a binder is known.
- the latter is referred to as a chemically amplified resist.
- a chemically amplified positive resist is particularly preferably used for fine processing.
- the upper layer or lower layer of the resist film For thin films used for the upper layer or lower layer of the resist film, it can be applied to the surface of the highly reflective substrate (the lower layer of the resist film) or the resist film surface (the upper layer of the resist film) to suppress reflection at the resist film interface and to stabilize the film.
- the lithographic copolymer is required to have the optical, chemical, and physical properties necessary for expressing the function of each thin film. It is an important component and is actively researched.
- an alkaline developer containing a repeating unit derived from hydroxystyrene and a phenolic hydroxyl group derived from hydroxystyrene such as acetal structure or quaternary hydrocarbon group.
- Repeating units protected with a group that inhibits dissolution in water and dissociates by the action of an acid hereinafter sometimes referred to as “acid dissociable, dissolution inhibiting group”
- acid dissociable, dissolution inhibiting group or a force derived from (hiialkyl) acrylic acid
- a copolymer having a repeating unit in which a lupoxyl group is protected with an acetal structure or an acid-dissolving dissolution inhibiting group such as a quaternary hydrocarbon group is known.
- Copolymers having a lactone structure as a repeating unit as a polar group for improving the adhesion to a lithographic solvent or adjusting the solubility in a lithographic solvent or developer (Patent Documents 7 to 1) (See 0 etc.).
- a repeating unit having an aromatic ring such as a benzene ring, a naphthalene ring, or an anthracene ring is used as a functional group for increasing the absorption coefficient or refractive index with respect to wavelengths of 2 48 nm and 19 3 nm.
- a repeating unit having a reactive functional group such as an amino group, an amide group, a hydroxyl group, or an epoxy group that can be cured by reacting with a curing agent or the like.
- Copolymers containing them see Patent Documents 11 to 14, etc. are known.
- the gap fill film has an appropriate viscosity for flowing into a narrow gap, and avoids mixing with a resist film or an antireflection film, so that a reactive functional group that can be cured by reacting with a curing agent or the like is used.
- Copolymers containing repeating units are known, specifically, containing repeating units derived from hydroxystyrene, and if necessary, polymerizable such as styrene, alkyl (meth) acrylate, hydroxyalkyl (meth) acrylate, etc.
- a copolymer containing a repeating unit derived from a monomer see Patent Document 15, etc. is known.
- the copolymer balances solubility by making repeating units with different solubility parameters into an appropriate composition and an appropriate arrangement, but the copolymer of the repeating unit is out of design, A copolymer in which repeating units having a specific structure are continuous has low solubility in a solvent. Therefore, studies are being made to avoid high polymers, repeating units that are out of design, and the formation of a continuum of specific repeating units.
- a so-called dropping polymerization method in which a monomer and a polymerization catalyst or a polymerization initiator are added to a heated solvent, and the composition for each molecular weight obtained by the method is uniform.
- a copolymer having high solubility in a solvent is known (see Patent Documents 18 to 19).
- a method of changing the monomer composition to be dropped between before and after dropping, a method in which some monomers are dissolved in a solvent in advance and heated to drop the remaining monomer and initiator, Copolymers obtained by this method are known, which can suppress a continuum of repeating units, has high solubility in a solvent, and has little microphone mouth gel in a lithography solution (Patent Documents 20 to 2).
- Patent Document 1 Japanese Patent Laid-Open No. 5-9-0 4 5 4 3 9
- Patent Document 2 Japanese Patent Application Laid-Open No. 0-5-1 1 3 6 6 7
- Patent Document 3 Japanese Patent Application Laid-Open No. 10-0 2 6 8 2 8
- Patent Document 4 Japanese Patent Application Laid-Open No. Sho 62-1-1 5 4 40
- Patent Document 5 Japanese Patent Application Laid-Open No. 09-9-073 1 7 3
- Patent Document 6 Japanese Patent Laid-Open No. 10-1 6 1 3 1 3
- Patent Document 7 Japanese Patent Application Laid-Open No. 09-009 0 6 3 7
- Patent Document 8 Japanese Laid-Open Patent Publication No. 10-2 0 7 0 6 9
- Patent Document 9 Japanese Patent Laid-Open No. 2 0 0 0 _ 0 2 6 4 4 6
- Patent Document 10 Japanese Patent Laid-Open No. 2 0 0 1-2 4 2 6 2 7
- Patent Document 1 1 Japanese Patent Laid-Open No. 2 00 0-3 1 3 7 7 9
- Patent Document 12 Japanese Patent Laid-Open No. 2 0 0 1-2 7 8 10
- Patent Document 13 Japanese Patent Laid-Open No. 2 0 0 1-1 9 2 4 1 1
- Patent Document 14 Japanese Patent Laid-Open No. 2 0 0 1-2 2 6 3 2 4
- Patent Document 15 Japanese Patent Laid-Open No. 2 0 0 3-5 7 8 2 8
- Patent Document 16 Japanese Patent Laid-Open No. 2 0 0 6-1 9 3 6 8 7
- Patent Document 17 Japanese Patent Laid-open No. 2 0 0 6-2 4 3 3 0 8
- Patent Document 18 Japanese Patent Application Laid-Open No. 2 0 0 2-1 9 4 0 2 9
- Patent Document 19 WO 1 9 9 9/0 5 0 3 2 2
- Patent Document 20 Japanese Patent Laid-Open No. 2 0 0 1-2 0 1 8 5 6
- Patent Document 21 Japanese Patent Laid-Open No. 2 0 0 3-2 4 6 8 2 5
- Patent Document 22 Japanese Patent Laid-Open No. 2 0 0 4-2 6 9 8 5 5
- the present invention has been made in view of the above-described background art, and the purpose thereof is a resist film used in semiconductor lithography, an antireflection film formed on an upper layer or a lower layer of the resist film, It is a copolymer for semiconductor lithography that is used to form thin films such as gap fill films and topcoat films. It is excellent in solubility in a composition solution for forming thin films, and it is difficult to generate fine particles such as microgels.
- An object of the present invention is to provide a copolymer for semiconductor lithography which is less prone to defects and a method for stably producing the copolymer on an industrial scale.
- the present inventors have intensively studied, and as a result, under specific conditions.
- the solution can be solved by a copolymer having a liquid passing rate of a specific value or higher when microfiltration is performed at the same time, and the copolymer is stably produced by polymerization under a specific condition on an industrial scale.
- the inventors have found that it can be manufactured and have completed the present invention.
- the present invention relates to a repeating unit (A) having a hydroxyl group, a group that suppresses dissolution in an alkaline developer and dissociates by the action of an acid (hereinafter referred to as “acid dissociable dissolution inhibiting group”).
- PGMEA propylene glycol monomethyl ether acetate
- the characteristic is that the average flow rate per filter area (hereinafter sometimes referred to as “fine filtration rate”) when passing through a filter for 60 minutes is 200 g / min / m 2 or more.
- the present invention also provides a monomer that provides a repeating unit (A) having a hydroxyl group using a polymerization tank having an internal volume of 100 L or more, which is provided with at least a canister for supplying a heat medium, a stirring blade, and a condenser.
- a monomer that provides a repeating unit (B) having a structure in which a hydroxyl group is protected with an acid dissociable, dissolution inhibiting group, a monomer that provides a repeating unit (C) having a lactone structure, and a repeating unit having a cyclic ether structure (D) a production method comprising a step of polymerizing a monomer containing at least one or more selected from monomers that give a monomer and a polymerization initiator by dropping it into a heated solvent, wherein at least the monomer Provided is a method for producing a copolymer for semiconductor lithography as described above, characterized in that the temperature of the heat medium supplied to the outer can during the dropping of the body is controlled to a polymerization temperature of + 10 ° C. or lower. is there.
- the copolymer of the present invention includes a repeating unit (A) having a hydroxyl group, a repeating unit (B) having a structure in which the hydroxyl group is protected with an acid dissociable, dissolution inhibiting group, a repeating unit (C) having a lactone structure, and a cyclic group. It contains at least one repeating unit selected from repeating units (D) having an ether structure. If necessary, a repeating unit (E) having a structure that suppresses dissolution in an alkali developer and is stable to the action of an acid (hereinafter sometimes referred to as “acid-stable dissolution inhibiting structure”), etc. Can be included. These repeating units can be selected according to the purpose of the thin film used in the semiconductor lithography.
- Repeating units (E) can be included.
- When used in a negative resist film it always contains at least one selected from the repeating unit (A) and the repeating unit (D) and, if necessary, at least selected from the repeating unit (C) and the repeating unit (E).
- One or more can be included.
- repeating unit (A) and repeating unit (D) force When used in an anti-reflection coating or immersion topcoat film, it must contain at least one selected from repeating unit (A) and repeating unit (D) force, and if necessary, repeating unit (B), It can contain at least one selected from repeating units (C) and repeating units (E).
- the repeating unit (A) is a repeating unit having a hydroxyl group, which improves adhesion to a substrate or a base film, controls the solubility in a lithographic solvent or an alkaline developer, and reacts with a curing agent. To form a cross-linked structure.
- the hydroxyl group may include a hydroxyl group that may be substituted by a halogen, a linear, branched, or cyclic hydrocarbon group, a carbonyl group, a sulfonyl group, or the like.
- the Specific examples include an alcoholic hydroxyl group, a phenolic hydroxyl group, a fluoroalcohol hydroxyl group, a strong hydroxyl group, a sulfo group, and the like, and preferably an alcoholic hydroxyl group, a phenolic hydroxyl group, a fluoroalcoholic water. It is an acid group and a strong lpoxyl group.
- structures represented by the formulas (A 1) to (A 3) are particularly preferable.
- R 1 () is a hydrogen atom or a carbon atom that may be substituted by a fluorine atom
- 1 to 4 hydrocarbon groups specifically, carbon such as hydrogen atom, methyl group, ethyl group, n-propyl group, i-propyl group, n_butyl group, i_butyl group, trifluoromethyl group, etc.
- An alkyl group that may be substituted with a fluorine atom of 1 to 4 may be mentioned, and preferably a hydrogen atom, a methyl group, or a trifluoromethyl group.
- R represents a single bond or a divalent hydrocarbon group having 1 to 4 carbon atoms that may be substituted by a fluorine atom.
- a single bond a methylene group, a 1,1-ethylene group, 2, 2_propylene group, 1, 1, 1, 1, 1, 3, 3, 3_hexafluoro-2,2_propylene group, 1,1,1_trifluoro-2_trifluoromethyl-2,3_propylene group, etc.
- Examples thereof include an alkylene group having 1 to 4 carbon atoms which may be substituted by a fluorine atom, and preferably a single bond, 1, 1, 1, 3, 3, 3_hexafluoro-2,2_propylene group, 1 , 1, 1_trifluoro 2_trifluoromethyl-1,2,3-propylene group, particularly preferably a single bond.
- i represents an integer of 1 or 2.
- R 12 is a hydrogen atom or a carbon atom that may be substituted by a fluorine atom.
- An alkyl group that may be substituted with a fluorine atom of 1 to 4 may be mentioned, and preferably a hydrogen atom, a methyl group, or a trifluoromethyl group.
- R 13 represents a divalent to tetravalent hydrocarbon group having 2 to 12 carbon atoms which may contain a fluorine atom, an oxygen atom or a sulfur atom, and specifically, a straight chain such as an ethylene group or an isopropylene group or Branched saturated hydrocarbon group, cyclohexane ring, norpolnan ring, 7_ o Xa_norpolnan ring, 7_thia-norpolnan ring, adamantane ring, tetracyclo [4. 4. 0. 1 2 ' 5 .
- 1 7 ⁇ '°] may be mentioned saturated alicyclic hydrocarbon group having a dodecane ring and, preferably, hexane ring, Noruporunan ring, Adamantan ring cyclohexylene.
- R 14 represents a single bond or a divalent hydrocarbon group having 1 to 4 carbon atoms that may be substituted by a fluorine atom, specifically, a single bond, a methylene group, or a 1, 1_ethylene group.
- 2,2_propylene group 1,1,1,1,3,3,3_hexafluoro-2,2_propylene group, 1,1,1_trifluoro-2_trifluoromethyl-1,2,3_propylene group
- R 13 is an adamantyl group and R 14 is a single bond is particularly preferable.
- j represents an integer of 1 to 3.
- R 15 is a hydrogen atom or a carbon atom that may be substituted by a fluorine atom.
- hydrocarbon groups specifically, fluorine such as hydrogen atom, methyl group, ethyl group, n-propyl group, i-propyl group, n_butyl group, i_butyl group, trifluoromethyl group, etc.
- fluorine such as hydrogen atom, methyl group, ethyl group, n-propyl group, i-propyl group, n_butyl group, i_butyl group, trifluoromethyl group, etc.
- alkyl group having 1 to 4 carbon atoms that may be substituted by an atom, and preferably a hydrogen atom, a methyl group, or a trifluoromethyl group.
- R 16 represents a divalent alicyclic hydrocarbon group having 6 to 12 carbon atoms which may contain an oxygen atom or a sulfur atom, specifically, a norpolnan ring, 7 _o xa —norpolnan ring, 7 _ thia— Examples thereof include a saturated alicyclic hydrocarbon group having a norbornane ring, tetracyclo [4. 4. 0. 1 2 ⁇ 5. V ⁇ 10 ] dodecane ring, etc., and preferably a norpolnan ring, tetracyclo [4.4.0 1 2 ' 5. 1 7 ⁇ ' °] It is a dodecane ring.
- k represents an integer of 0 or 1.
- repeating unit (A) Specific examples of the repeating unit (A) will be given below, but the present invention is not limited thereto. From the repeating unit (A), one type or a plurality of types having different structures can be selected and used.
- the repeating unit ( ⁇ ) is a repeating unit having a structure formed by protecting the hydroxyl group with an acid dissociable, dissolution inhibiting group, and functions to change the solubility of the copolymer in the alkaline developer.
- Preferable examples include a structure in which a hydroxyl group having a structure represented by the formulas ( ⁇ 1) to (A3) is protected with an acid dissociable, dissolution inhibiting group represented by the formula (b 1) or (b 2). it can.
- R 23 and R 24 each independently represent a hydrocarbon group having 1 to 4 carbon atoms, specifically, a methyl group, an ethyl group, an n_propyl group, an i_propyl group, an n_butyl group, an i_ Examples thereof include alkyl groups having 1 to 4 carbon atoms such as butyl group.
- R 25 represents a hydrocarbon group having 1 to 12 carbon atoms, specifically, a methyl group, an ethyl group, an n_propyl group, an i-propyl group, an n_butyl group, an i_butyl group, a cyclopentyl group.
- the ring R 25 is combined with R 23 or R 24, specifically, cyclopentane ring, cyclohexane ring, Noruporunan ring, tricyclo [5.2.2 1.0 2.6] decane ring, Adamantan ring, tetracyclo [4.4.0. 1 2 ' 5. 1 1 .
- a saturated alicyclic ring having 5 to 12 carbon atoms such as a dodecane ring may be formed.
- R 25 or R 25 is bonded to R 23 or R 24 to form a ring, specifically a cyclopentane ring, a cyclohexane ring, a norpolnan ring, tricyclo [5. 2. 1.0 2 ' 6 ] If a decane ring, adamantane ring, tetracyclo [4.4.0. 1 2 ' 5. 1 7 ' 10 ] dodecane ring, etc. are included, the difference in solubility in Al re-developer before and after lithography is large. It is preferable for drawing a fine pattern.
- R 26 and R 27 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms, specifically, hydrogen C1-C4 alkyl groups, such as an atom, a methyl group, an ethyl group, n-propyl group, i-propyl group, n_butyl group, i_butyl group, can be mentioned.
- R 28 represents a hydrocarbon group having 1 to 12 carbon atoms, specifically a methyl group, an ethyl group, an n-propyl group, an i_propyl group, an n_butyl group, an i_butyl group, a t_butyl group.
- cyclohexyl group 2 _ Echiru, cyclopentyl group, cyclohexyl group, Norupo Runiru group, tricyclo [5.2.2 1.0 2 '6] decanyl group, Adamanchiru group, Tet Rashikuro [4.4.0. 1 2 5'. 1 1 .
- R 26 may be bonded to R 27 or R 28 to form a ring.
- Specific examples of the ring in which R 26 is bonded to R 27 include cyclopentane ring, cyclohexane ring, norpolnan ring, tricyclo [5.2.2 1.0 2 '6] decane ring, Adamantan ring, tetracyclo [4.4.0. 1 2 5'. 1 7 '10] dodecane ring and, also, concrete rings R 26 is bonded to R 28 Examples include a hydrofuran ring and a hydropyran ring.
- repeating unit (B) Specific examples of the repeating unit (B) are shown below, but the present invention is not limited thereto. From the repeating unit (B), one type or a plurality of types having different structures can be selected and used.
- the repeating unit (C) is a repeating unit having a lactone structure, and functions to improve adhesion to a substrate or an undercoat film, or to control solubility in a lithographic solvent or an alkaline developer.
- a preferred example includes a structure represented by the formula (C 1).
- R 3 Q represents a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms that may be substituted by a fluorine atom.
- R 31 is a trifluoromethyl group represented by the formula (c) C represents a lactone structure-containing group
- one of 32 to 39 represents a single bond having a binding site as R 31 , and the remaining R 32 to R 39 are a hydrogen atom, carbon number 1 Represents a hydrocarbon group or alkoxy group of ⁇ 4,
- any one of R 32 to R 39 has a binding site as R 31, the Izu Re one or two and bonded carbon number 5-1 5 of the other 3 2-39 fat Represents a hydrocarbon group having 3 to 12 carbon atoms which may contain an oxygen atom or a sulfur atom to form a ring, and the remaining R 32 to R 39 are any one or two of which have 5 to 15 carbon atoms.
- the other R 32 to R 39 represent a hydrogen atom, a hydrocarbon group having 1 to 4 carbon atoms or an alkoxy group.
- alicyclic ring examples include cyclopentane ring, cyclohexane ring, norpolnan ring, 7_o Xa_norpolnan ring, 7_thia-norpolnan ring, tetracyclo [4.4.0. 1 2 ' 5. 1 7 ' 10 ]
- Dodecane ring and the like, preferably, norbornane ring and 7_oXa_norpolnan ring can be mentioned.
- hydrocarbon group having 1 to 4 carbon atoms include methyl group, ethyl group, n_propyl group, i_propyl group, n_butyl group, i_butyl group, and the like.
- alkoxy group of ⁇ 4 include a methoxy group and an ethoxy group.
- M represents an integer of 0 or 1.
- R 32 to R 39 represents a single bond having a binding site as R 31 , and the remaining R 32 to R 39 are a hydrogen atom, a hydrocarbon group having 1 to 4 carbon atoms or an alkoxy;
- the lactone structure representing the group there can be mentioned an r_petitolactone structure and (5-valerolactone structure.
- R 32 to R 39 One of which has a binding site as R 31 and is bonded to any one or two of R 32 to R 39 to form an alicyclic ring having 5 to 15 carbon atoms, an oxygen atom or a sulfur atom Represents a hydrocarbon group having 3 to 14 carbon atoms, and the remaining R 32 to R 39 are hydrogen atoms, or a lactone structure representing a hydrocarbon group or alkoxy group having 1 to 4 carbon atoms.
- Particularly preferred examples include 1,3-cyclohexanecarbolacton structure, 2,6_norpornancarboractone structure, 7_o xa_2,6-norpornancarbolacton structure, 4-oxa-tricyclo [5. 2. 1. 0 2 ' 6 ]
- the decane_3_on structure can be mentioned.
- repeating unit (C) Specific examples of the repeating unit (C) are shown below, but the present invention is not limited thereto. One type or multiple types of different structures can be selected from the repeating units (C).
- the repeating unit (D) is a repeating unit having a cyclic ether structure, which improves the adhesion to a substrate or an undercoat film, controls the solubility in a lithographic solvent or an alkaline developer, It reacts to form a cross-linked structure.
- a preferred example is a structure represented by the formula (D 1).
- R 4 () represents the number of carbon atoms that may be substituted by a hydrogen atom or a fluorine atom.
- Examples thereof include an alkyl group of 1 to 4, preferably a hydrogen atom, a methyl group, or a trifluoromethyl group.
- R 41 represents a hydrocarbon group having 3 to 7 carbon atoms containing a 3- to 6-membered cyclic ether structure, specifically, a hydrocarbon group having an epoxy ring, an oxetane ring, a tetrahydrofuran ring, or a tetrahydropyran ring. More specifically, glycidyl group, oxetanylmethyl group, tetrahydrofuranylmethyl group, tetrahydrovinylmethyl group and the like can be mentioned, and glycidyl group is particularly preferable.
- repeating unit (D) Specific examples of the repeating unit (D) are shown below, but the present invention is not limited thereto. From the repeating unit (D), one type or a plurality of types having different structures can be selected and used.
- the repeating unit (E) is a repeating unit having an acid-stable dissolution-inhibiting structure, and controls the optical properties such as the solubility in a lithographic solvent and Al-redeveloper, the refractive index of the thin film, and the light transmittance.
- Preferable examples include the structure (E 1), the structure (E2), the hydrogen atom of the hydroxyl group of the structure represented by the formula (A 1), the formula (A2) and the formula (A3) and the acid-stable dissolution inhibiting group, respectively. ) And structure (E3).
- the acid-stable dissolution-inhibiting groups of structures (E 1) to (E3) include a carbon number of 1 to 12 in which the carbon bonded to the oxygen atom by substitution with a hydrogen atom of the hydroxyl group is a primary to tertiary carbon Or a structure in which a 1-adamantyl group is bonded, specifically, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n_butyl group, or an i_butyl group.
- R 6 Is a hydrogen atom or the number of carbon atoms that may be substituted by a fluorine atom
- R 61 is a hydrogen atom or a single bond or a hydrocarbon group having 1 to 4 carbon atoms bonded to R 62. Specifically, a hydrogen atom, a single bond, a methylene group, an ethylene group, an isopropylene group, etc. Can be mentioned.
- R 62 is an aromatic hydrocarbon group having 6 to 14 carbon atoms, and specific examples include a benzene ring, a naphthalene ring, and an anthracene ring.
- repeating unit (E) Specific examples of the repeating unit (E) are shown below, but the present invention is not limited thereto. One type or multiple types of different structures can be selected from the repeating units (E).
- each repeating unit is suitable for the purpose of thin films used in semiconductor lithography. Therefore, it is different.
- the composition range of the repeating unit for each purpose of the thin film to be used is illustrated below.
- the repeating unit (A) and repeating unit (C) together are 20 to 95 mol 0 / o, preferably 30 to 90 mol 0 / o.
- Ri is preferably 4 0-8 5 mol 0 / o
- the repeating unit (B) is 5 to 8 0 mole 0 / o
- the repeating unit of (E) from 0 to 5 0 mole 0 / o, preferably 0-4 0 mole 0 / o, more preferably selected from the range of 0-3 0 mol%.
- the repeating unit (A) and the repeating unit (D) are combined in a range of 50 to 100 mol 0 / o, preferably 60 to 100 mol 0 / o. good Mashiku 7 0-1 0 0 mole 0 / o, the repeating unit (C) is 0 to 5 0 mole 0 / o, favored properly is 0-4 0 mole 0/0, more preferably 0 to 3 0 mol 0/0, the repeating unit (E) is 0 to 5 0 mole 0 / o, preferably 0-4 0 mole 0 / o, more preferably selected from the range of 0-3 0 mol%.
- the combined repeating units (A) and the repeating unit (D) 5 to 8 0 mole 0/0, preferably 1 0-7 0 mol%, more preferably 1 5-6 0 mol%
- the repeating unit (B) is 0 to 5 0 mol%, preferably 0 to 4 0 mole 0/0, more preferably 0 to 3 0 mol 0/0
- the repeating units ( C) is 0 to 50 mol 0 / o, preferably 0 to 40 mol 0 / o, more preferably 0 to 30 mol%
- the repeating unit (E) is 0 to 95 mol 0 / o, preferably 1 0-9 0 mole 0/0, and more preferably selected from the range of 2 0-8 5 mol%.
- the copolymer of the present invention contains a known terminal structure.
- a radical structure generated from a radical polymerization initiator is included as a polymerization initiation terminal.
- a radical structure generated from the chain transfer agent is included as a polymerization initiation terminal.
- a radical structure generated from the solvent or monomer is included as a polymerization initiation terminal.
- both ends can contain polymerization initiation ends, and when disproportionation termination, polymerization termination ends on one side The other can contain a monomer-derived terminal structure.
- a polymerization terminator When a polymerization terminator is used, it can contain a polymerization initiation terminal at one end and a terminal structure derived from the polymerization terminator at the other end. A plurality of these initiation reactions and termination reactions may occur in one polymerization reaction. In that case, a mixture of copolymers having a plurality of terminal structures is formed.
- the polymerization initiator, chain transfer agent, and solvent that can be used in the present invention will be described later.
- the mass average molecular weight (hereinafter sometimes referred to as “Mw”) is too high, the solubility in a resist solvent or an alkaline developer is lowered. Since the coating film performance deteriorates, it is preferably in the range of 1,000 to 50,000, more preferably in the range of 1,500 to 30,000, and 2,000 to 20,000. It is particularly preferable that it is within the range. Also, molecular weight distribution (hereinafter sometimes referred to as “Mw / M n”) Force ⁇ 1.0 to 5.0 is preferable, 1.0 to 3.0 More preferably, it is particularly preferably in the range of 1.2 to 2.5.
- Mw mass average molecular weight
- the microfiltration rate is obtained by dissolving a copolymer in a specific lithography solvent and passing it through a filter having a specific pore diameter and a specific pore size as a solution having a specific viscosity for a specific time.
- the average flow rate per filter area when liquid is used.
- the value obtained by dividing the amount of solution that has passed at a specific time by the specific time is taken as the average flow rate, and the value divided by the effective filtration area of the filter is taken as the average flow rate per filter area.
- PGME A which is commonly used as a lithography solvent, is used as a solution with a viscosity of 15 mPa ⁇ sec, a pressure difference of 0.1 MPa, and a pore size of 0.03 m. The value obtained by dividing the amount of solution (g) passed through for 60 minutes by 60 minutes (min) and the effective filtration area (m 2 ) of the filter when 60 minutes passed.
- the copolymer of the present invention has an average flow rate per filter area defined here, That is, it is a copolymer having a microfiltration rate of 200 g / min / m 2 or more. More preferably, it is 2500 g / min / m 2 or more, and particularly preferably 300 g / min / m 2 or more. Copolymers with a microfiltration rate of less than 200 g / min / m 2 cause poor appearance of the thin film due to fine particles such as microgel when the thin film is formed, and pattern defects are likely to occur. It is not preferable.
- the copolymer does not completely dissolve in the solvent, which causes pattern defects. If there is no fine foreign matter such as gel, it passes at a specific flow rate, but there is a fine foreign matter. In this case, the micropores are gradually blocked as they pass, and the flow velocity decreases.
- the copolymer of the present invention has extremely few such foreign substances, and exhibits an average flow rate of a specific value or more. Since foreign substances such as gel can be deformed freely, they cannot be completely removed even if they are subjected to microfiltration as in the manufacturing process (U) described later, but they are identified in the manufacturing process (P) described later. It is necessary to manufacture under the following conditions.
- the copolymer concentration in the PGMEA solution used for the measurement varies depending on the type of copolymer because the viscosity at the measurement temperature is adjusted to be 15 mPa ⁇ sec.
- the measurement temperature is preferably measured at room temperature as much as possible in order to match the solubility of the microgel to PGMEA. Usually, it is selected from the range of 10 to 40 ° C, preferably 20 to 30 ° C, and particularly preferably 22 to 27 ° C.
- a membrane filter made of polyethylene, polypropylene, fluorinated polyethylene or the like is preferable because it is not easily affected by the flow speed due to the difference in polarity of the copolymer.
- a polyethylene filter is preferable because it has a small variation in pore diameter and is excellent in solvent resistance.
- a specific example is a membrane filter made of ultra high molecular weight polyethylene for use in Japan Entegris MicroGuard Plus H C10.
- the copolymer of the present invention can be obtained through the step (P) of polymerizing the monomer giving the structure and the polymerization initiator in an organic solvent. If necessary The step of converting the polar group of the copolymer to other polar groups, such as protecting the polar group of the coalescence or removing the protective group (Q), from the copolymer to the monomer, polymerization initiator A step of removing unnecessary substances such as low molecular weight components such as unreacted oligomers (R), a step of removing low-boiling-point impurities, and a step of replacing the solvent with a solvent suitable for the next step or lithography ( It is also possible to combine S), a step of reducing metal impurities that are not preferable for the formation of semiconductors (Ding), a step of reducing material that causes pattern defects such as microgel (U), and the like.
- Step (P) is a step of polymerizing the monomer in an organic solvent in the presence of a polymerization initiator.
- a polymerization tank equipped with at least a canister for supplying a heat medium, a stirring blade, and a condenser is used.
- the internal capacity is 30 L or more, preferably 100 L or more, particularly preferably 20 00 L or more.
- the material is preferably a glass-lined container because it is necessary to avoid contamination of the metal and because it has high thermal conductivity and safety.
- the agitating blade is preferably a three-blade swept blade, a partial blade such as Shinko Environmental Solution Co., Ltd.
- twin star blade a full-zone blade manufactured by Shinko Environmental Solution Co., Ltd., or a full blade such as a bend leaf blade manufactured by Yoko Sangyo Co., Ltd. Since the stirring efficiency is high, full blades such as full zone blades and bendrif blades are particularly preferable.
- the polymerization of the present invention is preferably carried out by a so-called dropping method in which a monomer and a polymerization initiator are dropped into a heated solvent. A part of the monomer may be included in the heated solvent in advance. In addition, a plurality of liquids having different monomer compositions, polymerization initiator concentrations, and chain transfer agent concentrations are dropped, for example, the composition of the monomer dropped along with the dropping time, the monomer, the polymerization initiator, and the chain transfer. The composition ratio of the agent may be changed.
- a so-called independent dropping method in which a polymer and a polymerization initiator are dissolved in a solvent as necessary, and dropped separately into a heated solvent for polymerization can be employed.
- the (P 1) mixed dropping method is not used in the dropping liquid storage tank before dropping into the polymerization system. Because there is a chance of contact with the low concentration of radicals in a high concentration state of the reactive monomer, it is easy to produce a high polymer that causes microgels.
- the (P 2) independent dripping method does not coexist with the polymerization initiator in the dripping liquid storage tank, and therefore does not produce a high polymer. Therefore, the (P 2) independent dropping method is particularly preferred.
- the monomer solution and the initiator solution can be premixed immediately before the polymerization tank, but a high polymer is formed before the dropping. Since there is a possibility, it is particularly preferable to add each of them separately from separate storage tanks.
- the supply rates of the monomer solution and the initiator solution can be set independently so that a copolymer having a desired molecular weight distribution can be obtained. It is possible to obtain a copolymer having a wide molecular weight distribution from narrow dispersion to polydispersity with good reproducibility by changing either or both of the two liquid supply rates.
- a copolymer having a relatively high molecular weight is produced in the early reaction period where the radical concentration is low.
- a dispersed copolymer can be obtained.
- Each supply rate can be changed steplessly or stepwise.
- the amount of the polymerization solvent (hereinafter sometimes referred to as the initial tension solvent) to be initially loaded in the reaction vessel may be at least the minimum amount that can be stirred, but is more than necessary. If the amount is too large, the amount of monomer solution that can be supplied decreases, and production efficiency decreases, which is not preferable.
- a part of the monomer may be premixed in the initial tension solvent.
- the concentration of the monomer and the polymerization initiator in the dropping liquid is preferably higher in terms of productivity.
- the polymerizable monomer or the polymerization initiator when it is a liquid, it can be supplied as it is without dissolving in the solvent.
- the polymerizable monomer or the polymerization initiator is a viscous liquid or If it is a solid, it must be dissolved in a solvent.
- a polymerizable monomer or polymerization initiator is dissolved in a solvent If the concentration is too high, the viscosity of the solution increases and the operability is poor.
- the polymerizable monomer or the polymerization initiator when the polymerizable monomer or the polymerization initiator is a solid, it may precipitate, or it may take time for diffusion in the polymerization system, and a high polymer may be easily formed. Therefore, it is preferable to select a concentration in which each monomer and the polymerization initiator are sufficiently dissolved, do not precipitate during the supply, and easily diffuse in the polymerization system within a viscosity range in which there is no problem in the supply operation. And then.
- the specific concentration varies depending on the combination of solute and solvent in each solution, but usually
- the total concentration of all the monomers and the polymerization initiator concentration are, for example, 5 to 60% by mass, preferably 10 to 50% by mass.
- the polymerization temperature can be appropriately selected depending on the boiling point of the solvent, monomer, chain transfer agent, etc., the half-life temperature of the polymerization initiator, and the like. There is a problem in productivity because polymerization is difficult to proceed at low temperatures, and there is a problem in terms of stability of monomers and copolymers at higher temperatures than necessary. Therefore, the range of preferably 40 to 120 ° C, particularly preferably 60 to 100 ° C is selected.
- the polymerization reaction is generally an exothermic reaction, and the polymerization temperature tends to increase due to the polymerization reaction, so it is difficult to control to a constant temperature. If the polymerization temperature rises too much, the polymerization reaction may become uncontrollable and runaway. For this reason, in the present invention, as the polymerization solvent, at least one compound having a boiling point close to the target polymerization temperature is contained, and the polymerization temperature is higher than the initial boiling point of the components contained as the polymerization solvent at the polymerization pressure. It is preferable to set. According to this method, an increase in polymerization temperature can be suppressed by the latent heat of vaporization of the polymerization solvent.
- the polymerization pressure can be set as appropriate.
- nitrogen gas is generated in the case of a azo system, and oxygen gas is generated in the case of a peroxide size. Since the pressure does not easily fluctuate, it is preferable that the polymerization system is an open system and the reaction is performed near atmospheric pressure.
- the polymerization system is cooled by the supplied dripping liquid, the refluxing polymerization solvent, heat radiation to the outside, etc., so it is necessary to supply heat from the outside. In the present invention, it is added to the outer can. Heat is supplied by supplying a heated heat medium.
- the present invention by controlling the temperature difference between the heat medium supplied to the canister and the polymerization system as small as possible, the above-mentioned microgel causative substances are generated in the droplets adhering to the wall of the kettle. Can be suppressed.
- the temperature difference between the heating medium supplied to the outer can and the polymerization system must be within 10 ° C, more preferably within 5 ° C.
- the monomer solution is preferably supplied after preheating.
- Examples of the method of preheating the monomer solution include a method of heating the monomer solution with a heat exchanger or the like immediately before supplying the monomer solution into the storage tank or the polymerization system.
- the preheating temperature is preferably 25 ° C or higher, more preferably 30 ° C or higher.
- the temperature is preferably 50 ° C or lower, more preferably 40 ° C or lower.
- the initiator solution can also be preheated. However, if the temperature is too high, the polymerization initiator decomposes before feeding, and is usually 40 ° C or lower, preferably 30 ° C or lower. Below, more preferably 25 ° C or less.
- the dropping time of the monomer solution is not preferable because the molecular weight distribution is likely to be broadened when the time is short, and the temperature of the polymerization solution is lowered because a large amount of the solution is dropped at once.
- a long time is not preferable because the copolymer takes more heat history than necessary and the productivity decreases. Therefore, it is usually selected from the range of 0.5 to 24 hours, preferably 1 to 12 hours, particularly preferably 2 to 8 hours.
- the order of starting the supply of the two liquids but in order to avoid the formation of high polymers, it is preferable to supply the two liquids simultaneously or the initiator solution first. Since a certain period of time is required for the generation of radicals by decomposition, the initiator solution may be supplied before the monomer solution.
- radical polymerization initiators those known as radical polymerization initiators can be used.
- radical polymerization initiators such as azo compounds and peroxides.
- Specific examples of azo compounds include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2_methyl-pyronitrile), dimethyl-1,2'-azobisisobutyrate, 1,1 '-Azobis (cyclohexane_1_carponitolyl), 4, 4,' -azobis (4-cyananovaleric acid) and the like.
- peroxides include decanol peroxide, lauroyl bar oxide, benzoyl bar oxide, bis (3,5,5_trimethylhexanoyl) peroxide, succinic acid peroxide, tert-butyl bar —Oxy _ 2 _ethylhexanoate, tert-butyl oxypivalate —, 1, 1, 3, 3—tetramethylbutyl oxy-2-ethyl hexanoate, and the like. From the viewpoint of handling safety, azo compounds are particularly preferable. These can be used alone or in combination.
- the amount of the polymerization initiator used is selected according to the production conditions such as the target Mw, the raw material monomer, the polymerization initiator, the chain transfer agent, the type and composition ratio of the solvent, the polymerization temperature, and the dropping method. Can be selected.
- chain transfer agent a known chain transfer agent can be used as necessary.
- thiol compounds are preferable, and a wide variety can be selected from known thiol compounds. Specific examples include t-dodecyl mercabtan, mercaptoethanol, mercaptoacetic acid, mercaptopropionic acid, and the like.
- the amount of chain transfer agent used depends on the production conditions such as the target Mw, the monomer as the raw material, the polymerization initiator, the chain transfer agent, the type and composition ratio of the solvent, the polymerization temperature, and the dropping method. You can choose.
- the chain transfer agent may be dropped by mixing with a monomer, may be dropped by mixing with a polymerization initiator, or may be used by dissolving in a solvent to be heated in advance.
- the solvent is not particularly limited as long as it is a compound that dissolves a monomer, a polymerization initiator, a chain transfer agent, and a copolymer obtained by polymerization.
- Specific examples include ketones such as acetone, methyl ethyl ketone, methyl isoamyl ketone, methyl amyl ketone and cyclohexanone; alcohols such as methanol, ethanol and isopropanol; ethylene glycol monomethyl ether, ethylene glycol mono Ether ethers such as ethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, 3-methoxy _ 3 _methyl _ 1 -butanol; ester compounds of the above ether alcohols with acetic acid, etc.
- Ether esters Esters such as methyl acetate, ethyl acetate, butyl acetate, methyl propionate, methyl 3-methypropionate, ethyl 3-ethoxypropionate, methyl lactate, ethyl lactate, and _ptilolactone; Rahidorofuran, 1, 4 _ Jiokisan, ethylene glycol one Rujimechirue one ether, diethylene glycol dimethyl E, such as one ether Ethers; aromatic hydrocarbons such as toluene and xylene; amides such as N, N-dimethylformamide and N-methylpyrrolidone; dimethyl sulfoxide and acetonitrile. These can be used alone or in admixture of two or more.
- the polar group of the copolymer is protected or deprotected simultaneously with the step (P) or after the step (P), so that the polar group of the copolymer is changed to another polar group. It is the process of converting into.
- a step (Q 1) of introducing a polar group (C) by protecting a part or all of the polar group (A) or polar group (B) of the copolymer with an acid dissociable, dissolution inhibiting group examples include a step (Q2) of introducing a polar group (A) or a polar group (B) by deprotecting part or all of the polar group (C) of the polymer.
- step (Q 1) the copolymer having an alkali-soluble group is dissolved in a solvent and reacted with enolic ether or halogenated alkyl ether in the presence of a catalyst to give acid dissociation properties.
- a dissolution inhibiting group is introduced.
- step (Q2) the copolymer having an acid dissociable, dissolution inhibiting group is dissolved in a solvent, and heated in the presence of a catalyst to dissociate the acid dissociable, dissolution inhibiting group, thereby removing the alkali-soluble group. Introduce.
- the catalyst used in step (Q 1) and step (Q2) is not particularly limited as long as it is a known catalyst capable of achieving the above reaction, but preferably hydrochloric acid, sulfuric acid, p-toluenesulfonic acid, trifluoroacetic acid It is a strong acid with a p Ka of 1 or less at 25 ° C in water, such as strongly acidic ion exchange resins.
- the solvent is preferably the solvent exemplified in step (P).
- a solvent having a hydroxyl group such as water or alcohol, reacts with enol ether or halogenated alkyl ether, and should be avoided as much as possible.
- a low molecular weight component such as a monomer or a polymerization initiator contained in the copolymer obtained through the step (P) such as a monomer or a polymerization initiator is extracted into a solvent. It is a process of removing. For example, (R 1): adding a poor solvent to precipitate the copolymer, and then separating the solvent phase; (R 1 a): (R 1) followed by adding the poor solvent; A method of separating the solvent phase after washing the copolymer. (R 1 b): Add good solvent following (R 1), re-dissolve copolymer, and add poor solvent to add copolymer.
- the poor solvent is not particularly limited as long as it is a solvent in which the copolymer is difficult to dissolve.
- a solvent in which the copolymer is difficult to dissolve For example, water, alcohols such as methanol and isopropanol, and saturated hydrocarbons such as hexane and heptane are used. be able to.
- the good solvent is not particularly limited as long as it is a solvent in which the copolymer is easily dissolved, and examples thereof include the compounds exemplified as the polymerization solvent. These solvents can be used alone or as a mixed solvent of two or more. In terms of management of the production process, the same one as the polymerization solvent is preferable.
- Step (S) is a step of removing low boiling point impurities contained in the copolymer solution or replacing the solvent with a solvent suitable for the next step or lithography.
- the initial solvent and the supplied solvent are distilled off while supplying a solvent preferred as the next step or lithography one composition, and further concentrated as necessary, and the solvent is used as the next step or lithography one composition. It can be carried out by the step (S 2) of substituting with a preferred solvent.
- This step (S) is performed when, for example, the lithography composition is different from the solvent obtained through the step (P) or the step (R), or an undesirable impurity exists in the lithography composition.
- step (S) After passing through step (S) and precipitating as a solid by drying under reduced pressure, it can be dissolved in another solvent, but in this operation, impurities and solvent remain in the solid, Further, it is not preferable because it is necessary to give the copolymer a thermal history more than necessary.
- the temperature of step (S) is not particularly limited as long as the copolymer does not change in quality, but it is usually preferably 100 ° C or lower, more preferably 80 ° C or lower, and even more preferably 70. ° C or lower, particularly preferably 60 ° C or lower.
- the amount of the solvent to be supplied later is too small, the low boiling point compound cannot be removed sufficiently, and if it is too large, the replacement takes time, and the copolymer has a thermal history more than necessary. It is not preferable.
- it can be selected from the range of 1.05-fold to 10-fold, preferably ⁇ 1.1-fold to 5-fold, particularly preferably 1.2-fold to 3-fold, of the amount required as a solvent for the finished solution.
- Step (T) is a step of reducing a metal content that is not preferable for semiconductor lithography.
- Metal may be mixed from raw materials, secondary materials, equipment, and other environments, and this amount may exceed the allowable value for semiconductor formation.
- the metal content may be reduced.
- the step (R) can be combined with the step (R).
- Other methods include a step of contacting with a cation exchange resin (T 1), a step of contacting with a cation exchange resin and a mixed resin of an anion exchange resin or an acid adsorption resin (T 2), A step (T 3) or the like of passing through a filter containing a substance having a positive zeta potential such as a rhohydrin cation resin can be selected.
- T 3 a filter containing a substance having a positive zeta potential such as a rhohydrin cation resin.
- the step (u) is a step of reducing a microgel such as a high polymer, which is undesirable because it causes pattern defects, by passing a copolymer dissolved in an organic solvent through a filter.
- the filtration accuracy of the filter is preferably 0.2 m or less, preferably 0.1 m or less, particularly preferably 0.05 m or less.
- the material of the filter include polyolefins such as polyethylene and polypropylene, polyamides, polyesters, resins containing polar groups such as polyacrylonitrile, and fluorine-containing resins such as fluorinated polyethylene. Polyamide is particularly preferable. It is.
- polyamid filters examples include ULTI PLEAT P-Nylon 6 6 made by Nippon Pole, ULTI PORE N 6 6, KUNO Photo Shield, and Electric Port Pore IIEF.
- polyethylene-based filter examples include Microguard Plus HC 10 and Optimizer 1 manufactured by Nihon Entegris. These filters may be used alone or in combination of two or more.
- the copolymer obtained by the above method is prepared by dissolving a dry solid in one or more lithographic solvents, or a copolymer solution dissolved in one lithography solvent, if necessary, the same or different.
- the lithographic composition can be finished by diluting with a lithographic mono-solvent and adding the necessary additives to the intended lithographic mono-composition.
- the lithography one solvent is not particularly limited as long as it can dissolve each component constituting the lithography one composition to form a uniform solution. Any one of the known lithography one solvents can be used. It can be used as one or a mixture of two or more. Usually, the solubility, viscosity, boiling point, and absorption of radiation used for lithography in the composition other than the copolymer from among the reaction solvent in the step (P) and the solvent exemplified as the good solvent in the step (R) Etc. can be selected. Specific examples include methyl amyl ketone, cyclohexanone, ethethyl lactate (EL), _ptilolactone, and PGMEA.
- the amount of the resist solvent contained in the resist composition is not particularly limited, but is usually a concentration that can be applied to a substrate or the like, and is appropriately set so as to have an appropriate viscosity according to the film thickness.
- the resist composition is used so that the solid content concentration thereof is in the range of 2 to 20% by mass, preferably 5 to 15% by mass.
- component (X) ⁇ a radiation-sensitive acid generator (X) below, hereinafter referred to as component (X) ⁇
- component ( ⁇ ) ⁇ an acid such as a nitrogen-containing organic compound for preventing the diffusion of acid to a portion not exposed to radiation Diffusion inhibitor ( ⁇ ) below
- component ( ⁇ ) ⁇ an acid such as a nitrogen-containing organic compound for preventing the diffusion of acid to a portion not exposed to radiation Diffusion inhibitor ( ⁇ ) below
- component ( ⁇ ) ⁇ ) ⁇ an acid such as a nitrogen-containing organic compound for preventing the diffusion of acid to a portion not exposed to radiation Diffusion inhibitor ( ⁇ ) below
- component ( ⁇ ) ⁇ ) ⁇ an additives ( ⁇ ) ⁇ hereinafter referred to as component ( ⁇ ) ⁇
- Component (X) can be appropriately selected from those proposed so far as radiation-sensitive acid generators for chemically amplified resists. Examples include onium salts such as sodium and sulfonium salts, oxime sulfonates, diazomethanes such as bisalkyl or bisarylsulfonyldiazomethanes, and nitrobenzilsulfonates. , Iminosulfonates, disulfones, and the like. Among them, onium salts having a fluorinated alkylsulfonic acid anion as anion are particularly preferable. These may be used alone or in combination of two or more. Component (X) is generally used in an amount of 0.5 to 30 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the copolymer.
- onium salts such as sodium and sulfonium salts, oxime sulfonates, diazomethanes such as bisalkyl or bisaryl
- the component ( ⁇ ) can be appropriately selected from those conventionally proposed as acid diffusion inhibitors for chemically amplified resists. Examples thereof include nitrogen-containing organic compounds, and primary to tertiary alkylamines or hydroxyalkylamines are preferred. In particular, tertiary alkylamines and tertiary hydroxyalkylamines are preferred, with triethanolamine and triisopropanolamine being particularly preferred. These may be used alone or in combination of two or more.
- the component ( ⁇ ) is usually used in the range of 0.01 to 5.0 parts by weight with respect to 100 parts by weight of the copolymer.
- the ⁇ component ( ⁇ ) ⁇ includes organic carboxylic acids and phosphorus oxo acids for the purpose of preventing deterioration of the sensitivity of the acid generator, improving the shape of the resist pattern, and stability of retention.
- organic carboxylic acids include malonic acid, citrate, malic acid, succinic acid, benzoic acid, salicylic acid, and the like, and these can be used alone or in admixture of two or more.
- the organic carboxylic acid is used in the range of 0.01 to 5.0 parts by mass with respect to 100 parts by mass of the copolymer.
- N Simple: Recursion derived from mer N L J return unit ⁇ • ⁇ B'J (C 1 0 5)
- PGMEA Propylene glycol monomethyl ether acetate
- Detector Differential refractive index (RI) detector Column: Showa Denko KF— 804 L (x 3)
- the sample was placed in a glass tube with an inner diameter of 1 Omm and measured under the conditions of a temperature of 40 ° C and the number of scans of 10,000.
- a copolymer solution was prepared so as to have the following composition with respect to 100 parts by mass of the copolymer.
- Example 1 This solution was spin-coated on a silicon wafer with the rotation speed adjusted, and baked on a hot plate at 100 ° C. for 90 seconds to form a thin film having a thickness of 300 to 400 nm. The appearance of the thin film was inspected, and the thin film containing fine streaks such as microgel was judged as “bad”, and the uniform thin film with no streaks was judged as “good”. [0138] Example 1
- MEK 8. O kg, MA IB 4.0 kg was charged into a 20 L polyethylene initiator dissolution tank equipped with a stirrer, and stirred while being immersed in a warm water tank maintained at 30 ⁇ 2 ° C with each container. Dissolved to prepare a uniform “initiator solution”. Outer can and Shinko Environmental Solution Co., Ltd.
- a full-zone bladed stirrer and condenser are provided.
- ME K is placed in a 200 L glass-lined polymerization tank with a slight flow of nitrogen gas at the tip of the condenser and opened to the atmosphere. 30.0 kg was charged to create a nitrogen atmosphere in the tank.
- warm water controlled at 83.0 ⁇ 0.5 ° C was kept flowing to the outer can while stirring in the polymerization vessel, and the temperature in the polymerization vessel was kept at 79-81 ° C.
- the warm water controlled at 83.0 ⁇ 0.5 ° C flowing through the outer can keeping the temperature inside the polymerization tank at 80 ° C and aging for 2 hours. did.
- the temperature difference between the warm water flowing in the outer can of the polymerization tank and the polymerization tank was 2.9 to 3.8 ° C.
- the outer canister was cooled by flowing cooling water of about 20 ° C. and cooled to room temperature.
- a refining filtration tank equipped with a mantle, a stirrer, a filter bed covered with a polyester filter cloth, and a pull-out tube with a valve at the bottom of the filter bed. kg and pour a 15 ⁇ 1 ° C brine into the outer can. While stirring, the state was maintained. Here, the polymerization solution is dropped to precipitate the copolymer, and further stirred for 30 minutes. Then, while continuing stirring, the liquid extraction valve at the bottom of the filtration bed is opened, and the filtrate is discharged to obtain a wet cake. Obtained.
- warm water controlled at 83.0 ⁇ 0.5 ° C was kept flowing to the outer can while stirring in the polymerization vessel, and the temperature in the polymerization vessel was kept at 79-81 ° C.
- the warm water controlled at 83.0 ⁇ 0.5 ° C flowing through the outer can keeping the temperature inside the polymerization tank at 80 ° C and aging for 2 hours. did.
- the temperature difference between the warm water flowing in the outer can of the polymerization tank and the polymerization tank was 2.6 to 4.7 ° C.
- the outer canister was cooled by flowing cooling water of about 20 ° C. and cooled to room temperature.
- the remaining solution was put into a solvent replacement tank equipped with a mantle, a stirrer, and a condenser, depressurized while stirring, and heated by flowing hot water of 55 ⁇ 1 ° C. into the mantle. After partially distilling off light components such as acetone, the light component and a part of PGMEA were distilled off while adding PGMEA to obtain a PGMEA solution containing 25% by mass of the copolymer.
- the obtained PGMEA solution was analyzed by GPC, and the copolymer Mw and Mw / Mn Asked. Moreover, the filter flow rate was measured by the method described above. The results are summarized in Table 1.
- a uniform “monomer solution” was prepared by charging 1.0 kg with a nitrogen atmosphere in the tank, and stirring and dissolving while flowing warm water of 30 ⁇ 2 ° C into the outer can.
- a 20 L polyethylene initiator dissolution tank equipped with a stirrer is charged with ME K 8. O kg and MA IB 4.0 kg, and the whole container is stirred while being immersed in a hot water tank maintained at 30 ⁇ 2 ° C.
- the remaining copolymer-containing phase was put into a solvent replacement tank equipped with a mantle, a stirrer, and a condenser, depressurized while stirring, and heated by flowing hot water of 55 ⁇ 1 ° C through the mantle. .
- PGMEA was added while distilling off light components and a part of PGMEA to obtain a PGM EA solution containing 25% by mass of a copolymer.
- the obtained PGMEA solution was analyzed by GPC to determine the Mw and Mw / Mn of the copolymer. Moreover, the filter flow rate was measured by the method described above. The results are summarized in Table 1.
- Example 2 The same procedure as in Example 1 was performed except that warm water controlled at 94 ⁇ 1 ° C. was passed through the outer can of the polymerization tank.
- the temperature difference between the hot water flowing in the outer can of the polymerization tank and the temperature in the polymerization tank was 13.9 to 15.0 ° C.
- Example 2 The same procedure as in Example 2 was performed except that warm water controlled at 94 ⁇ 1 ° C. was passed through the outer can of the polymerization tank. The temperature difference between the hot water flowing in the outer can of the polymerization tank and the temperature in the polymerization tank was 13.7 to 15.2 ° C. [0152] Comparative Example 3 (AOE)
- Example 3 The same procedure as in Example 3 was performed except that warm water controlled at 94 ⁇ 1 ° C. was poured into the outer can of the polymerization tank. The temperature difference between the hot water flowing in the outer can of the polymerization tank and the polymerization tank is 1
- the thin film using the copolymer having a fine filtration rate of 200 g / min / m 2 or more was There was no appearance defect due to microgel, etc., and it was in a very good state.
- the polymerization temperature is set to be equal to or higher than the initial boiling point of the component contained as the polymerization solvent, and the polymerization is performed under the condition that the solvent is refluxed.
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- General Physics & Mathematics (AREA)
- Materials For Photolithography (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
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JP2008163319A (ja) | 2008-07-17 |
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