WO2006011442A1 - ポジ型レジスト組成物およびレジストパターン形成方法 - Google Patents
ポジ型レジスト組成物およびレジストパターン形成方法 Download PDFInfo
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- WO2006011442A1 WO2006011442A1 PCT/JP2005/013564 JP2005013564W WO2006011442A1 WO 2006011442 A1 WO2006011442 A1 WO 2006011442A1 JP 2005013564 W JP2005013564 W JP 2005013564W WO 2006011442 A1 WO2006011442 A1 WO 2006011442A1
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- positive resist
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
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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
- G03F7/0047—Photosensitive materials characterised by additives for obtaining a metallic or ceramic pattern, e.g. by firing
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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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—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
Definitions
- the present invention relates to a positive resist composition and a resist pattern forming method.
- a chemically amplified resist containing a base material component capable of forming a film and an acid generator component that generates an acid upon exposure is known. It has been. Chemically amplified resists are classified into a negative type in which alkali solubility is reduced by exposure and a positive type in which alkali solubility is increased by exposure. Conventionally, a polymer is used as a base material component.
- Patent Documents 1 and 2 propose a low molecular weight material having an alkali-soluble group such as a hydroxyl group and partially or entirely protected with an acid dissociable, dissolution inhibiting group. Such low molecular weight materials are expected to be able to reduce roughness due to the small molecular size due to their low molecular weight.
- Patent Document 1 JP 2002-099088
- Patent Document 2 JP 2002-099089 A
- the solubility in the developer is affected by materials other than low-molecular materials, and the dissolution inhibition effect by acid generators and other materials (for example, nitrogen-containing organic compounds such as tertiary amines) is quickly affected by polymers. It is larger than the resist.
- the pattern shape to deteriorate, such as the T-top shape of the cross-sectional shape of the pattern that is greatly affected by the dissolution inhibitory effect of the acid generator.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a positive resist composition and a resist pattern forming method that are excellent in all of the pattern shape, sensitivity, and resolution. To do.
- the inventors of the present invention have a pattern shape containing a protector obtained by protecting a phenolic hydroxyl group of a specific low molecular weight polyhydric phenol compound with an acid dissociable, dissolution inhibiting group. It has been found that the above-mentioned problems can be solved by combining a base material for a composition material and a specific acid generator, and the present invention has been completed.
- a part of the phenolic hydroxyl group in the polyhydric phenol compound (X) having two or more phenolic hydroxyl groups and a molecular weight of 300 to 2500 is an acid.
- a positive electrode comprising a substrate (A) for forming a pattern comprising a protector (XI) that is protected by a dissociable, dissolution inhibiting group, and an acid generator component (B) that generates an acid upon exposure.
- Type resist composition comprising:
- the component (B) is a positive resist composition containing an aluminum salt acid generator (B1) having an alkyl sulfonate ion as a cation.
- the second aspect of the present invention includes a step of forming a resist film on a substrate using the positive resist composition of the first aspect, a step of exposing the resist film, and developing the resist film.
- the resist pattern forming method includes a step of forming a resist pattern.
- exposure is a concept including radiation irradiation in general.
- the present invention provides a positive resist composition and a resist pattern forming method that are excellent in all of the pattern shape, sensitivity, and resolution.
- the positive resist composition of the present invention has two or more phenolic hydroxyl groups, and part of the phenolic hydroxyl group in the polyvalent phenol compound (X) having a molecular weight of 300 to 2500 is an acid dissociable, dissolution inhibiting group.
- a base material for pattern forming material (A) (hereinafter sometimes referred to as component (A)) comprising a protected protector (XI) and an acid generator component that generates an acid upon exposure ( B) (hereinafter also referred to as component (B)).
- the component (A) is a part of the phenolic hydroxyl group in the polyhydric phenolic compound (X) having two or more phenolic hydroxyl groups and having a molecular weight of 300 to 2500.
- a base material for a pattern forming material comprising a protector (XI) which is entirely protected by an acid dissociable, dissolution inhibiting group.
- the polyvalent phenol compound (X) is the one before being protected with the acid dissociable, dissolution inhibiting group, and the one protected with the acid dissociable, dissolution inhibiting group is the protector (XI), Component (A) contains a protector (XI).
- the acid dissociable, dissolution inhibiting group dissociates, whereby the entire component (A) is alkali-soluble, such as alkali-insoluble.
- alkali-soluble such as alkali-insoluble.
- the positive resist pattern can be formed by alkali development.
- the polyhydric phenol compound (X) constituting the protector (XI) is not particularly limited as long as it is a polyhydric phenol compound having two or more phenolic hydroxyl groups and a molecular weight of 300 to 2500.
- a sensitizer in a non-chemically amplified g-line or i-line resist can be used as a polyhydric phenol compound known as a heat resistance improver. Examples of such polyhydric phenol compound are as follows.
- polyhydric phenol compound strength represented by the following general formula (I) is particularly preferable because the effects of the present invention are excellent.
- ⁇ each independently a linear, branched or cyclic lower alkyl group having 1 to 10 carbon atoms, preferably 1 to 5 carbon atoms, a cyclic alkyl group having 5 to 6 carbon atoms or an aromatic hydrocarbon group.
- the alkyl group or aromatic hydrocarbon group may contain a hetero atom such as an oxygen atom, a nitrogen atom, or a sulfur atom in its structure.
- the aromatic hydrocarbon group include a full group, a tolyl group, a xylyl group, a mesityl group, a phenethyl group, and a naphthyl group.
- g and j are each independently an integer of 1 or more, preferably 1 or 2, k is 0 or 1 or more, preferably an integer not exceeding 2, and g + j + k is 5 or less .
- h is 1 or more, preferably an integer of 1 to 2, 1 and m are each independently 0 or 1 or more, Preferably, it is an integer not exceeding 2, and h + 1 + m is 4 or less.
- i is an integer of 1 or more, preferably 1 to 2
- n and o are each independently 0 or 1 or more, preferably an integer not exceeding 2
- i + n + o is 4 or less.
- p is 0 or 1, preferably 1.
- R 1 is a cycloalkyl group
- j is 1, and R 2 is a lower alkyl group
- k is 1 and g is 1 are preferable.
- R 1 is a cyclohexyl group
- j is 1
- R 2 is a lower alkyl group
- k is 1
- g is 1
- a compound in which h, i, 1 and h and i are both 1 is preferable because a fine pattern can be formed with high resolution and reduced roughness.
- polyhydric phenolic compounds represented by the general formula (I) the most preferable one is a polyhydric phenolic compound represented by the following formula ( ⁇ ⁇ ) or (III): .
- the polyvalent phenol compound (X) needs to have a molecular weight of 300 to 2500, preferably 450 to 1500, more preferably 500 to 1200. Maximum molecular weight By the following, the roughness is reduced, the pattern shape is further improved, and the resolution is also improved. Further, when the value is equal to or more than the lower limit value, a resist profile with a favorable profile shape can be formed.
- the polyhydric phenol compound (X) preferably has a molecular weight dispersity (MwZMn) of 1.5 or less because the effects of the present invention are further excellent. This is probably because the narrower the molecular weight distribution of the polyvalent phenolic compound (X), the relatively uniform alkali solubility of each protected body and unprotected body. The smaller the degree of dispersion is, the more preferable it is, and it is preferably 1.4 or less, and most preferably 1.3 or less. In addition, when the polyhydric phenol compound (X) used for the base material is one kind alone, the dispersity is 1.
- the degree of dispersion can be determined by synthesizing the final target product polyvalent phenolic compound (X) and then purifying and removing reaction by-products and impurities, and by using known methods such as molecular weight fractionation. The quantity part can be removed and adjusted.
- the dispersity is generally used by measuring Mw and Mn by a method for measuring the weight average molecular weight (Mw) and number average molecular weight (Mn) of the polymer, for example, gel permeation chromatography, and the like. It can be calculated by obtaining the Mn ratio.
- the protector (XI) is protected by substituting part or all of the hydroxyl groups of the phenolic hydroxyl group of the polyhydric phenol compound (X) with an acid dissociable, dissolution inhibiting group.
- the acid dissociable, dissolution inhibiting group is not particularly limited, and is proposed for hydroxystyrene-based resins and (meth) acrylic acid-based resins used in chemically amplified resist compositions for KrF and ArF. It can be used by appropriately selecting from unreasonable forces.
- Specific examples include a chain alkoxyalkyl group, a tertiary alkyloxycarbonyl group, a tertiary alkyl group, a tertiary alkoxycarboalkyl group, and a cyclic ether group.
- the chain alkoxyalkyl group includes 1 ethoxyethyl group, 1 ethoxymethyl group, 1-methoxymethylethyl group, 1-methoxymethyl group, 1 isopropoxychetyl group, 1 methoxypropyl group, 1 ethoxypropyl group, 1 n Butoxetyl group and the like.
- Examples of the tertiary alkyloxycarbonyl group include a tert-butyloxycarboxyl group and a tert-amyloxycarboxyl group.
- Tertiary alkyl groups include chain tertiary alkyl groups such as tert butyl and tert-amyl groups, fatty acids such as 2-methyladadamantyl groups and 2-ethyladadamantyl groups. And tertiary alkyl groups containing an aromatic polycyclic group.
- tertiary alkoxy carboalkyl group examples include a tert butyloxy carboxymethyl group, a tert-amyloxy carbonylmethyl group, and the like.
- Examples of the cyclic ether group include a tetrahydrovinyl group and a tetrahydrofuranyl group.
- 1-ethoxyethyl group and 1-ethoxymethyl group are preferred because chain alkoxyalkyl groups are preferred because they have excellent dissociation properties, can improve the uniformity of the protector (XI), and can improve roughness. More preferred.
- a plurality of polyhydric phenolic compounds (hereinafter referred to as isomers) having different numbers of phenolic hydroxyl groups (protected number) protected by acid dissociable, dissolution inhibiting groups.
- isomers polyhydric phenolic compounds having different numbers of phenolic hydroxyl groups (protected number) protected by acid dissociable, dissolution inhibiting groups.
- the ratio of the protected form (XI) in the component (A) and the ratio of each isomer in the protected form (XI) can be measured by means such as reverse phase chromatography.
- the proportion of the protector (XI) is preferably more than 40% by mass, more preferably more than 50% by mass, and even more preferably more than 80% by mass. Most preferably, it is 100 mass%.
- the protector (XI) is, for example, one or more polyphenolic compound (X), and all or part of its phenolic hydroxyl groups are dissolved in an acid-dissociable form by a known method. It can be produced by a method of protecting with an inhibiting group.
- the number of protected isomers can be adjusted according to the conditions of the method for protecting with the acid dissociable, dissolution inhibiting group.
- Component (A) is a compound in which the phenolic hydroxyl group in the polyhydric phenolic compound (X) is an acid. It is protected with a dissociable, dissolution inhibiting group, and contains an unprotected form (X2)! /, May!
- the unprotected body (X2) is one in which the hydroxyl group of the phenolic hydroxyl group of the polyhydric phenol compound (X) is not protected at all by the acid dissociable, dissolution inhibiting group, that is, the polyhydric phenol compound (X). It is.
- the unprotected body (X2) is 60% by mass or less, roughness can be reduced when a pattern is formed. Also excellent in resolution
- the proportion of the unprotected substance (X2) in the component (A) can be adjusted, for example, by removing the unprotected substance (X2) with a gel permeation chromatograph (GPC).
- GPC gel permeation chromatograph
- the proportion of the unprotected substance (X2) in component (A) can be measured by means such as reverse phase chromatography.
- the protection rate of the phenolic hydroxyl group in the component (A), that is, the phenolic hydroxyl group protected by the acid dissociable, dissolution inhibiting group and the acid dissociation property relative to the total amount of the phenolic hydroxyl group protected is preferably 5 to 50 mol%, more preferably 7 to 30 mol%, considering the resolution and roughness reduction effect.
- the content of the component (A) in the positive resist composition of the present invention should be adjusted according to the thickness of the resist film to be formed.
- the present invention is characterized in that the component (B) contains an acid salt acid generator (B1) having an alkyl sulfonate ion as a key.
- any alkyl sulfonate ion may be used as a cation, and the cation constituting the salt with the cation is particularly limited.
- it may be a cation of a known acid generator proposed in a conventional chemically amplified resist composition. Examples of such cations include sulphoyuumion and odonium ion.
- the form salt acid generator (B1) strength is excellent in the effect of the present invention by containing an form salt represented by the following general formula (B-1). preferable.
- ⁇ each independently represents an aryl group or an alkyl group, and at least one of R 1 ′ to R 3 ′ is preferably an aryl group 2 It is more preferable that the above is an aryl group. Most preferably, all of “ ⁇ ” are aryl groups.
- the aryl group of IT to R 3 ′ is not particularly limited, for example, an aryl group having 6 to 20 carbon atoms, which may or may not be substituted with an alkyl group, a halogen atom, or the like. And a naphthyl group.
- An aryl group having 6 to 10 carbon atoms is preferable because it can be synthesized at a low cost.
- the alkyl group for R 1 to R 3 ′ is not particularly limited, and examples thereof include linear, branched or cyclic alkyl groups having 1 to C: LO. From the viewpoint of excellent resolution, the number of carbon atoms is preferably 1 to 5. Specifically, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, an n-pentyl group, a cyclopentyl group, a hexyl group, a cyclohexyl group, a nonyl group, A decanyl group etc. are mentioned. A methyl group is preferable because it is excellent in resolution and can be synthesized at low cost. Among these, it is most preferable that all of R to R 3 ′ are a phenol group.
- q is an integer of 1 to 10, and is preferably an integer of 1 to 8.
- An integer of 4 to 8 is more preferable, and 4 or 8 is industrially easy to synthesize. Most preferred from.
- the alkyl group represented by C H may be linear or branched.
- Is a linear alkyl group such as methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-no -Le Group, n-decyl group and the like.
- the form salt-based acid generator (B1) may be used alone or in combination of two or more.
- the component (B) is further used in a conventional chemically amplified resist composition !, which is a known acid generator (hereinafter referred to as other acid generator (B2)).
- the proportion of the salt salt acid generator (B1) in the component (B) is 50 to: It is preferable that it is LOO mass% 80 ⁇ : It is most preferable that LOO mass% is 100 mass% more preferable.
- Other acid generators (B2) have heretofore been formed salt acid generators such as odonium salt and sulfo-um salt (however, the above-mentioned salt salt acid generator ( B1)), oxime sulfonate acid generators, bisalkyl or bisarylsulfol diazomethanes, diazomethane acid generators such as poly (bissulfol) diazomethanes, nitrobenzil sulfonate acid generators, iminos There are many known types such as sulfonate acid generators and disulfone acid generators.
- salt acid generators such as odonium salt and sulfo-um salt (however, the above-mentioned salt salt acid generator ( B1)), oxime sulfonate acid generators, bisalkyl or bisarylsulfol diazomethanes, diazomethane acid generators such as poly (bissulfol) diazomethanes,
- onium salt acid generators other than the above onium salt acid generator (B1) include trifluoromethane of diphenyl methane. Sulfonate or nonafluorobutane sulfonate, trifluoromethane trifluorosulfonate, heptafluoropropane sulfonate or nonafluorobutane sulfonate, trifluoromethane sulfonate of dimethyl (4-hydroxynaphthyl) sulfone, Its heptafluoropropane sulfonate or its nonafluorobutane sulfonate, monophenyl dimethyl sulfone trifluoromethane sulfonate, its heptafluoropropane sulfonate or its nonafluorobutane sulfonate, diphenyl monomethyl sulfone
- oxime sulfonate acid generator examples include ⁇ - ( ⁇ -toluenesulfo- Luoxyimino) -Benzyl cyanide, ⁇ - ( ⁇ -Chronobenzenebenzene-Luximinomino) -Benzyl cyanide, ⁇ - (4-Nitrobenzenesulfo-Luoxyimino) -Benzyl cyanide, ⁇ - (4-Nitro-2- Trifluoromethylbenzenesulfonyloxymino) -benzyl cyanide, ⁇ - (benzenesulfo-oxyximino) -4-chlorobenzoyl cyanide, ⁇ - (benzensulfo-oxyximino) -2,4-dichlorobenzilcia -, ⁇ -(Benzenesulfo-oxyximino) -2, 6-dichlorobenzil cyanide, ⁇ -(Benzenesulfo-
- bisalkyl or bisarylsulfol diazomethanes include bis (isopropylsulfol) diazomethane, bis ( ⁇ -toluenesulfol) diazomethane, bis (1,1-dimethylethylsulfol) diazomethane, bis (cyclohexylsulfol) diazomethane, bis (2,4 dimethylphenylsulfonyl) diazomethane and the like.
- Poly (bissulfonyl) diazomethanes include, for example, 1,3 bis (phenylsulfo-diazomethylsulfol) propane (a compound) having a structure shown below, decomposition point 135 ° C.
- the content of the component (B) is preferably 0.1 to 60 parts by mass, more preferably 15 to 60 parts by mass, and 100 to 50 parts by mass with respect to 100 parts by mass of the component (A). Further preferred. By being at least the lower limit, the effects of the present invention can be sufficiently obtained. If the above range is exceeded, it may be difficult to obtain a uniform solution and may cause deterioration of storage stability.
- the amount of component (B) in the resist composition depends on the resolution and pattern shape. Considering the effect on the shape, it is considered to be less than 10 parts by mass for 100 parts by mass of component (A).
- the component (B) is blended at a high concentration, the component (B), which has almost no adverse effect on the resolution and pattern shape, is blended at a high concentration exceeding, for example, 20 parts by mass. Is possible.
- the resist composition of the present invention can be produced by dissolving the component (A), the component (B) and any components described later in an organic solvent (hereinafter sometimes referred to as the component (C)).
- any component can be used as long as it can dissolve each component to be used to form a uniform solution. Two or more kinds can be appropriately selected and used.
- ketones such as ⁇ -butyrolatatone, acetone, methyl ethyl ketone, cyclohexanone, methyl isoamyl ketone, 2-heptanone, ethylene glycol, ethylene glycol monoacetate, diethylene glycol, diethylene glycol monoacetate, propylene Polyols and their derivatives such as glycol, propylene glycolol monoacetate, dipropylene glycol, or monomethyl ether, monoethyl ether, monopropyl ether, monobutyl ether or monophenyl ether of dipropylene glycol monoacetate, and dioxane Cyclic ethers, methyl lactate, ethyl lactate (EL), methyl acetate, ethyl acetate, butyl acetate, methyl pyruvate, ethyl pyruvate, Methyl Tokishipuropion acid, and ethoxy propionic acid Echiru
- organic solvents can be used alone or as a mixed solvent of two or more.
- a mixed solvent obtained by mixing propylene glycol monomethyl ether acetate (PGMEA) and a polar solvent is preferable.
- the mixing ratio (mass ratio) may be appropriately determined in consideration of the compatibility between PGMEA and the polar solvent, but is preferably 9: 1 to 1: 9, more preferably 8: 2 to 2: 8. Preferably within range! /.
- the mass ratio of PGMEA: EL is preferably 8: 2 to 2: 8, more preferably 7: 3 to 3: 7! / ,.
- component (C) at least one of the other PGMEA and EL strengths is selected.
- a mixed solvent of seeds and ⁇ -petit-mouthed rataton is also preferred.
- the mixing ratio of the former and the latter is preferably 70: 30-95: 5.
- propylene glycol monomethyl ether is also preferable.
- the amount of component (C) used is not particularly limited, and is a concentration that can be applied to a support such as a substrate, and is appropriately set according to the coating film thickness. It is used so that the solid content concentration is in the range of 220 mass%, preferably 5 15 mass%.
- a nitrogen-containing organic compound (D) (hereinafter referred to as (D) component) is further added as an optional component in order to improve the resist pattern shape, stability with time, etc. ) Can be blended.
- Component (D) is usually used in the range of 0.01 to 5.0 parts by mass per 100 parts by mass of component (A).
- component (E) an organic carboxylic acid or phosphorus oxoacid or a derivative thereof (E) (hereinafter referred to as component (E)) can be further contained as an optional component.
- component (D) and the component (E) can be used in combination, or any one of them can be used.
- organic carboxylic acid for example, malonic acid, citrate, malic acid, succinic acid, benzoic acid, salicylic acid and the like are suitable.
- Phosphorus oxoacids or derivatives thereof include phosphoric acid, phosphoric acid di-n-butyl ester, phosphoric acid diphenol ester and other derivatives such as phosphoric acid, phosphonic acid, phosphonic acid dimethyl ester, Phosphonic acids such as phosphonic acid-di-n-butyl ester, phenylphosphonic acid, phosphonic acid diphenyl ester, phosphonic acid dibenzyl ester and derivatives thereof, phosphines such as phosphinic acid, phenylphosphinic acid, etc. Derivatives such as acids and their esters are mentioned, among which phosphonic acid is particularly preferred.
- Component (E) is used in a proportion of 0.01 to 5.0 parts by mass per 100 parts by mass of component (A).
- the positive resist composition of the present invention further contains miscible additives such as an additional resin for improving the performance of the resist film, a surfactant for improving the coating property, and a dissolution agent.
- miscible additives such as an additional resin for improving the performance of the resist film, a surfactant for improving the coating property, and a dissolution agent.
- An inhibitor, a plasticizer, a stabilizer, a colorant, an antihalation agent, and the like can be added as appropriate.
- additional resins include those proposed as base resins such as conventional chemically amplified KrF positive resist compositions and ArF positive resist compositions, which are used when forming resist patterns. It can be suitably selected according to the type of exposure light source.
- the ratio of the additional resin is within a range that does not impair the effects of the present invention, and is preferably 20% by mass or less, preferably 10% by mass or less, based on the total solid content of the positive resist composition. More preferred.
- a resist pattern can be formed, for example, by the following resist pattern forming method. That is, first, the positive resist composition is applied onto a substrate such as silicon wafer with a spinner or the like, and the pre-beta is applied at a temperature of 80 to 150 ° C. for 40 to 120 seconds, preferably 60 to This is applied for 90 seconds, and an electron beam, an ultra-violet line, etc. are selectively exposed to this using, for example, an electron beam drawing apparatus. In other words, after exposure through a mask pattern or drawing by direct irradiation with an electron beam without going through a mask pattern, PEB (post-exposure heating) is performed for 40 to 500 seconds under a temperature condition of 70 to 150 ° C.
- PEB post-exposure heating
- alkali developing solution for example 0.1 to 10 mass 0/0 tetramethylammonium - developing is conducted using an Umuhidorokishido solution. In this way, a resist pattern faithful to the mask pattern can be obtained.
- An organic or inorganic antireflection film can be provided between the substrate and the coating layer of the resist composition.
- the wavelength used for the exposure is not particularly limited.
- the positive resist composition according to the present invention is effective against EB and EUV, particularly EB.
- a resist pattern excellent in all of the pattern shape, sensitivity, and resolution can be formed. It is conceivable that the dissolution inhibitory effect of the um salt-based acid generator (B1) is small, and the solubility of the um salt-based acid generator (B1) in water is high. In other words, since the dissolution inhibitory effect of the salt salt acid generator (B1) is small, the adverse effect on the resolution and pattern shape of the component (B) is small. It is speculated that the sensitivity can be further increased by doing so. In addition, since the aqueous salt-based acid generator (B1) is highly water-soluble, it is presumed that the resist film is easily adapted to the developer and the rinsing solution, thereby improving the resolution.
- the number of phenolic hydroxyl groups in the MBSA protector (al) and the number of phenolic hydroxyl groups protected with 1 ethoxyethyl group were measured for the obtained MBSA protector (al) by proton NMR at 400 MHz manufactured by JEOL.
- the protection ratio (mol%) was determined, it was 19.9 mol%.
- the protection ratio is ⁇ number of phenolic hydroxyl groups protected with 1 ethoxyethyl group Z (number of phenolic hydroxyl groups + number of phenolic hydroxyl groups protected with 1-ethoxyethyl group) ⁇ X 100.
- the obtained positive resist composition solution was uniformly applied onto an 8-inch silicon substrate that had been subjected to hexamethyldisilazane treatment using a spinner, and baked at 120 ° C for 90 seconds. Processing (PAB) was performed to form a resist film (film thickness 150 nm).
- the resist film was drawn with an electron beam drawing machine (Hitachi HL-800D, 70 kV acceleration voltage), and treated at 100 ° C for 90 seconds beta treatment (PEB) with tetramethylammonium hydroxide (TMAH). 2.
- PEB beta treatment
- TMAH tetramethylammonium hydroxide
- a line and space (LZS) pattern was formed by developing with a 38 mass% aqueous solution (23 ° C) for 60 seconds and rinsing with pure water for 30 seconds. The obtained resist pattern was evaluated! The results are shown in Table 1.
- the exposure time at which lOOnm line and space was formed 1: 1 was measured in units of ⁇ C / cm 2 (energy amount) as sensitivity (EOP). ⁇ Pattern shape>
- triphenylsulfo-n-butanesulfonate (20 parts by mass) used in Example 1 was triphenylsulfo-n-octanesulfonate (23 parts by mass), and the blending amount of EM was 1530 parts by mass.
- a positive resist composition solution was obtained in the same manner as in Example 1 except that:
- Example 1 the same evaluation as in Example 1 was performed using the obtained positive resist composition solution.
- the PAB condition was changed to 110 ° C for 90 seconds, and the PEB condition was changed to 90 ° C for 90 seconds.
- the results are shown in Table 1.
- Triphenyl sulfone n-butane sulfonate (20 parts by mass) used in Example 1 was changed to triphenyl sulfone nonafluorobutane sulfonate (30 parts by mass), and the blending amount of EM was 1530.
- a positive resist composition solution was obtained in the same manner as in Example 1 except that the amount was changed to parts by mass.
- Comparative Example 1 Although the sensitivity was high, the pattern shape with low resolution was also T-top. This is because the concentration of component (B) is high, so the resolution is high, but the resolution is reduced. In addition, the low molecular weight compound is used as the base material component, so the dissolution by component (B) is suppressed. It is presumed that the influence of the effect was strong.
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US7923192B2 (en) * | 2004-02-20 | 2011-04-12 | Tokyo Ohka Kogyo Co., Ltd. | Base material for pattern-forming material, positive resist composition and method of resist pattern formation |
JP3946715B2 (ja) | 2004-07-28 | 2007-07-18 | 東京応化工業株式会社 | ポジ型レジスト組成物およびレジストパターン形成方法 |
JP4468119B2 (ja) * | 2004-09-08 | 2010-05-26 | 東京応化工業株式会社 | レジスト組成物およびレジストパターン形成方法 |
JP4837323B2 (ja) * | 2004-10-29 | 2011-12-14 | 東京応化工業株式会社 | レジスト組成物、レジストパターン形成方法および化合物 |
US7981588B2 (en) * | 2005-02-02 | 2011-07-19 | Tokyo Ohka Kogyo Co., Ltd. | Negative resist composition and method of forming resist pattern |
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WO2006134811A1 (ja) * | 2005-06-13 | 2006-12-21 | Tokyo Ohka Kogyo Co., Ltd. | 多価フェノール化合物、化合物、ポジ型レジスト組成物およびレジストパターン形成方法 |
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JP2006347892A (ja) * | 2005-06-13 | 2006-12-28 | Tokyo Ohka Kogyo Co Ltd | 化合物、ポジ型レジスト組成物およびレジストパターン形成方法 |
JP4813103B2 (ja) | 2005-06-17 | 2011-11-09 | 東京応化工業株式会社 | 化合物、ポジ型レジスト組成物およびレジストパターン形成方法 |
JP4732038B2 (ja) | 2005-07-05 | 2011-07-27 | 東京応化工業株式会社 | 化合物、ポジ型レジスト組成物およびレジストパターン形成方法 |
JP4774996B2 (ja) * | 2005-07-26 | 2011-09-21 | Jsr株式会社 | 感放射線性樹脂組成物 |
US7960089B2 (en) | 2005-09-20 | 2011-06-14 | Tokyo Ohka Kogyo Co., Ltd. | Compound, method for producing same, positive resist composition and method for forming resist pattern |
JP5000241B2 (ja) * | 2005-11-04 | 2012-08-15 | 東京応化工業株式会社 | 化合物、ポジ型レジスト組成物およびレジストパターン形成方法 |
JP4879559B2 (ja) * | 2005-09-20 | 2012-02-22 | 東京応化工業株式会社 | 化合物およびその製造方法 |
JP5031277B2 (ja) | 2006-06-20 | 2012-09-19 | 東京応化工業株式会社 | ポジ型レジスト組成物およびレジストパターン形成方法 |
JP4980078B2 (ja) * | 2007-01-12 | 2012-07-18 | 東京応化工業株式会社 | ポジ型レジスト組成物およびレジストパターン形成方法 |
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