WO2005080474A1 - 高分子化合物、該高分子化合物を含有するフォトレジスト組成物、およびレジストパターン形成方法 - Google Patents
高分子化合物、該高分子化合物を含有するフォトレジスト組成物、およびレジストパターン形成方法 Download PDFInfo
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- WO2005080474A1 WO2005080474A1 PCT/JP2005/000660 JP2005000660W WO2005080474A1 WO 2005080474 A1 WO2005080474 A1 WO 2005080474A1 JP 2005000660 W JP2005000660 W JP 2005000660W WO 2005080474 A1 WO2005080474 A1 WO 2005080474A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0046—Photosensitive materials with perfluoro compounds, e.g. for dry lithography
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/02—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes
- C08G61/04—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms
- C08G61/06—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms prepared by ring-opening of carbocyclic compounds
- C08G61/08—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms prepared by ring-opening of carbocyclic compounds of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
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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
- G03F7/0395—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 a backbone with alicyclic moieties
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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 polymer compound, a photoresist composition containing at least the polymer compound, and a method for forming a resist pattern, which are used for patterning a semiconductor integrated circuit by lithography. More specifically, it has excellent resolution characteristics in fine pattern Jung using a light source with a wavelength of 300 nm or less, for example, KrF, ArF, F excimer laser.
- the present invention relates to a polymer compound for a photoresist composition, a photoresist composition containing the polymer compound, and a method for forming a resist pattern.
- This F excimer is attracting attention as a future fine pattern processing technology.
- Examples of the chemically amplified resist include, as shown in the following Non-patent Document (1-3), an acetal group and a tert-butyl group as an acid-dissociable protecting group for a fluorinated alcohol.
- a photoresist containing such a tertiary alkyl group, a tert-butoxycarbol group, or a tert-butoxycarbolmethyl group is known.
- Non-Patent Document 1 T. Hagiwara, S. Irie, T. Itani, Y. Kawaguchi, O. Yokokoji, S
- Non-Patent Document 2 F. Houlihan, A. Romano, D. Rentkiewicz, R. Sakamuri, R. R. Dammel, W. Conley, G. Rich, D. Miller, L. Rhodes, J. McDaniels, C. Chang, J. Photopolym. Sci. Technol. 16, 581, 2003.
- Non-Patent Document 3 Y. Kawaguchi, J. Me, S. Kodama, S. Okada, Y. Takebe, I. Kaneko, O. Yokokoji, S. Ishikawa, S. Irie, T, Hagiwara, T. Itani, Proc. SPIE, Vol. 5039, p. 43, 2003.
- the present invention has been made in view of the above, and includes a polymer compound having a novel acid-dissociable, dissolution-inhibiting group that is excellent in the resolution and shape of a resist pattern, and includes the polymer compound. And a method for forming a resist pattern.
- the present inventors have introduced various acid-dissociable, dissolution-inhibiting groups as protecting groups for alkali-soluble groups contained in a polymer compound for a photoresist composition.
- a hydrophilic acid-dissociable, dissolution-inhibiting group represented by a specific general formula is used, a fine pattern with improved resist pattern resolution can be obtained.
- the present invention has been completed.
- the polymer compound that is effective in the first aspect of the present invention is a polymer compound whose alkali solubility is changed by the action of an acid, and has an alkali-soluble group (i),
- a part of the hydrogen atom of the hydroxyl group in the group (i) is represented by the following general formula (1)
- R represents an organic group having 20 or less carbon atoms and having at least one or more hydrophilic groups.
- R is protected by an acid dissociable, dissolution inhibiting group (ii).
- the alkali-soluble group (i) is preferably at least one selected from the group consisting of an alcoholic hydroxyl group, a phenolic hydroxyl group, and a hydroxyl group.
- the alkali-soluble group (i) is an alcoholic hydroxyl group, it is more preferable that the carbon atom adjacent to the carbon atom bonded to the alcoholic hydroxyl group has at least one fluorine atom.
- the hydrophilic group is preferably a carbonyl group, an ester group, an alcoholic hydroxyl group, an ether, an imino group, or an amino group.
- the photoresist composition which is effective in the second aspect of the present invention comprises a base resin component (A) whose alkali solubility changes by the action of an acid, and an acid generated by irradiation with radiation.
- the base resin component (A) is the polymer compound described above.
- the method of forming a resist pattern according to the present invention includes a step of forming a photoresist film on a substrate using such a photoresist composition, a step of exposing the photoresist film, and a step of exposing the exposed photoresist film. To form a resist pattern.
- a chemically amplified positive resist can be prepared by using a polymer compound represented by a specific general formula and having a hydrophilic acid-dissociable, dissolution-inhibiting group (ii) in the molecule.
- the alkali solubility before and after exposure greatly changes, so that a fine pattern with high resolution can be provided. Further, it is possible to prevent the resist pattern from being thinned. Further, the adhesion of the resist pattern to the substrate can be improved by the effect of the introduced hydrophilic group, and the development defects can be reduced by improving the affinity of the resist for an alkali developing solution.
- the high molecular compounds which act on the first aspect of the present invention have a structure in which a part of the hydrogen atom of the hydroxyl group in the lysible group (i) in the molecule has the following general formula (1)
- R represents an organic group having 20 or less carbon atoms and having at least one or more hydrophilic groups.
- R is protected by an acid dissociable, dissolution inhibiting group (ii).
- the polymer compound of the present invention When the polymer compound of the present invention is used in a chemically amplified positive resist system, the polymer compound has a hydrophilic acid dissociable, dissolution inhibiting group (ii) represented by the above general formula (1).
- the compound before exposure, the compound exhibits an action of inhibiting dissolution in alkali development, and after exposure and Post Exposure Bake (hereinafter abbreviated as “PEB”) process, exhibits alkali solubility by deprotection.
- PEB Post Exposure Bake
- the chemical amplification type positive resist significantly changes the solubility before and after exposure, and can provide a fine pattern with high resolution.
- film loss of the resist pattern can be prevented.
- the effect of the introduced hydrophilic group can improve the adhesion of the resist pattern to the substrate, and can reduce development defects by improving the affinity of the resist for an alkali developing solution.
- the acid dissociable, dissolution inhibiting group (ii) includes a hydroxyl group hydrogen atom in at least one alkali-soluble group (i) selected from the group consisting of an alcoholic hydroxyl group, a carboxyl group, and a phenolic hydroxyl group. Bond to the oxygen atom.
- the acid dissociable, dissolution inhibiting group (ii) is represented by the above general formula (1), wherein the hydrophilic group is a hydroxyl group, an ester group, an alcoholic hydroxyl group, an ether, an imino group. And an amino group.
- R having such a hydrophilic group is an organic group having 20 or less carbon atoms and having at least one kind of hydrophilic group, and for example, a group represented by the following chemical formulas (2)-(10) Can be mentioned.
- R having such a hydrophilic group includes a linear or branched alkylene group having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms, or a lower alkyl group having 15 to 15 carbon atoms such as a methoxy group or an ethoxy group.
- the alkali-soluble group (i) in the polymer compound of the present invention is exemplified by the above-mentioned non-patent literature, and the KrF resist, ArF resist, and F resist which have been proposed so far.
- alkali-soluble group (i) examples include an alcoholic hydroxyl group, a phenolic hydroxyl group, and a carboxyl group, and are not particularly limited.
- the alkali-soluble group (i) is an alcoholic hydroxyl group
- a phenolic Hydroxyl and carboxyl groups are preferably at least one selected from the group.
- alcoholic hydroxyl groups are preferred because of their high transparency and moderate alkali solubility.
- a carbon atom adjacent to the carbon atom bonded to the alcoholic hydroxyl group and an alcoholic hydroxyl group having at least one fluorine atom are more preferable.
- the alcoholic hydroxyl group may be simply a hydroxyl group, or an alcoholic hydroxyl group-containing alkyloxy group or an alcoholic hydroxyl group containing a hydroxyl group, such as an alkyloxy group, an alkyloxyalkyl group or an alkyl group. It may be an alkyloxyalkyl group or an alkyl group containing an alcoholic hydroxyl group.
- Examples of the alkyloxy group, the alkyloxyalkyl group or the alkyl group include a lower alkyloxy group having 11 to 15 carbon atoms, a lower alkyloxy lower alkyl group having 11 to 10 carbon atoms, and a lower alkyl group having 115 carbon atoms. No.
- the lower alkyloxy group include a methyloxy group, an ethyloxy group, a propyloxy group, and a butyloxy group.
- Specific examples of the lower alkyloxy lower alkyl group include a methyloxymethyl group.
- a lower alkyl group such as a methyl group, an ethyl group, a propyl group and a butyl group.
- the alcoholic hydroxyl group-containing alkyloxy group the alcoholic hydroxyl group-containing alkyloxyalkyl group or the alcoholic hydroxyl group-containing alkyl group, one of the alkyloxy group, the alkyloxyalkyl group, or a hydrogen atom of the alkyl group is included. Part or all may be substituted with a fluorine atom.
- the alcoholic hydroxyl group-containing alkyloxy group or the alcoholic hydroxyl group-containing alkyloxyalkyl group those in which some of the hydrogen atoms of the alkyloxy portion are substituted with fluorine atoms, and those in the alcoholic hydroxyl group-containing alkyl group.
- the alkyl group in which part of the hydrogen atoms has been replaced with a fluorine atom that is, an alcoholic hydroxyl group-containing fluoroalkyloxy group, an alcoholic hydroxyl group-containing fluoroalkyloxyalkyl group or an alcoholic hydroxyl group-containing one. Fluoroalkyl groups.
- the alcoholic hydroxyl group-containing fluoroalkyloxy group includes (HO) C (CF) CH 2 O— group, 2-bis (trifluoromethyl) -2-hydroxyethyloxy group, (HO) C (C
- the alcoholic hydroxyl group-containing fluoroalkyl group includes (HO) C (CF) CH
- a 3222 group a 3-bis (trifluoromethyl) -3-hydroxypropyl group, and the like.
- phenolic hydroxyl group examples include, for example, phenolic hydroxyl groups contained in novolak resin, polyhydroxystyrene and the like because they are inexpensive and easily available. Of these, phenolic hydroxyl groups of polyhydroxystyrene are preferred because they have excellent resolution and are suitable for fine patterns. /.
- the carboxyl group includes, for example, a carboxyl group of an ethylenically unsaturated carboxylic acid.
- the ethylenically unsaturated carboxylic acid include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, and fumaric acid. Of these, acrylic acid and methacrylic acid are preferred because they are inexpensive and readily available.
- the polystyrene equivalent mass average molecular weight of the polymer compound of the present invention by gel permeation chromatography is not particularly limited, but is not particularly limited to a force of 000 to 80,000, preferably 80 to 50,000, more preferably 8,000 to 20,000. It is said.
- the degree of dispersion (Mw / Mn) is about 1.0-5.0, preferably 1.0-2.5, more preferably 1.0-2.0.
- the polymer compound of the present invention may have at least one unit force or at least two unit forces selected from monomer units having the alcoholic hydroxyl group, phenolic hydroxyl group, and carboxyl group.
- the polymer may further contain units of a conventionally known polymer compound for a photoresist composition, or may be used by mixing with such a polymer.
- Examples of the polymer compound having an alkali-soluble group (i), which is a precursor of the polymer compound of the present invention, include alcoholic hydroxyl groups represented by the following chemical formulas (11) to (19).
- Hydroxystyrene units or a-methylhydroxystyrene A compound having a phenolic hydroxyl group such as a carboxylic acid unit, a polymer compound containing a derived unit, and a unit derived from a compound having a carboxyl group such as methacrylic acid or acrylic acid represented by the following chemical formula (21).
- Known low-molecular weight compounds having at least one alkali-soluble group (i) selected from the group consisting of an alcoholic hydroxyl group, a carboxyl group, and a phenolic hydroxyl group are known as hydrogens of the hydroxyl group of the alkali-soluble group (i).
- the compound is used as a low molecular compound for a photoresist composition used as a dissolution inhibitor. be able to.
- the low molecular weight compound for a photoresist composition has an alkali-soluble group (i) in the molecule protected by an acid dissociable, dissolution inhibiting group (ii) represented by the above general formula (1).
- an acid dissociation inhibitor (C) in a chemically amplified positive resist system
- it exhibits a dissolution inhibiting effect in alkali development before exposure, and exhibits exposure and PEB treatment. After processing, it shows alkali solubility by deprotection. Therefore, the chemically amplified positive resist significantly changes the alkali solubility before and after exposure, and can provide a fine pattern with high resolution.
- film loss of the resist pattern can be prevented.
- the adhesion of the resist pattern to the substrate can be improved by the effect of the introduced hydrophilic group, and the development defects can be reduced by improving the affinity of the resist for an alkali developing solution.
- the acid dissociable, dissolution inhibiting group (ii) in the low molecular compound for a photoresist composition is the same as the acid dissociable, dissolution inhibiting group (ii) in the polymer compound of the present invention, and includes an alcoholic hydroxyl group, And a hydrogen atom of the alkali-soluble group (i) in the low molecular weight compound having at least one alkali-soluble group (i) selected from the group consisting of a phenolic hydroxyl group and a phenolic hydroxyl group.
- the acid dissociable, dissolution inhibiting group (ii) is represented by the above general formula (1), wherein the hydrophilic group is a hydroxyl group, an ester group, an alcoholic hydroxyl group, an ether, an imino group. And an amino group.
- R having such a hydrophilic group include organic groups represented by the following chemical formulas (2) to (10).
- R having such a hydrophilic group examples include a linear or branched alkylene group having 2 to 6, preferably 2 to 4 carbon atoms, a methoxy group or an ethoxy group. 1 to 5 carbon atoms such as lower alkoxy group, methoxycarboxy group or ethoxycarbon group having 2 to 6 carbon atoms such as lower alkoxycarbyl group, acetyl group or propionyl group. 5 organic groups having an acyl group, an amino group, an imino group, etc. bonded thereto; and organic groups such as a rattan ring having 2 to 6 carbon atoms, a cyclic ether group, and a nitrogen-containing alicyclic group.
- the alkali-soluble group (i) in the low molecular weight compound for a photoresist composition is known from KrF resist, ArF resist, and F resist that have been proposed so far.
- Examples of such an alkali-soluble group (i) include an alcoholic hydroxyl group, a phenolic hydroxyl group, and a carboxyl group, and are not particularly limited. Yes.
- the alkali-soluble group is preferably at least one selected from alcoholic hydroxyl group, phenolic hydroxyl group, and carboxyl group.
- alcoholic hydroxyl groups are preferable because they have high transparency and have appropriate alkali solubility.
- the carbon atom adjacent to the carbon atom bonded to the alcoholic hydroxyl group is more preferably an alcoholic hydroxyl group having at least one fluorine atom.
- Examples of the low molecular weight compound for a photoresist composition include a carbon atom having an alcoholic hydroxyl group represented by the following chemical formulas (22) and (23) and bonded to the alcoholic hydroxyl group. And a compound having a carboxyl group described below and a compound having a phenolic hydroxyl group described below.
- Examples of the compound having a carboxyl group include bile acids such as cholic acid and lithocholic acid which are known as a dissolution inhibitor precursor of a chemically amplified resist.
- a polyvalent phenol compound which is known as a sensitizer / a heat resistance improver in a non-chemically amplified g-line or i-line resist can be used.
- Examples of such polyvalent phenolic daggers include, for example,
- the high molecular weight compound and the low molecular weight compound for a photoresist composition having the specific acid dissociable, dissolution inhibiting group (ii) of the present invention start from a halogenated methyl ether compound containing a halogen atom.
- a methylated etherified compound is synthesized as a precursor of an acid dissociable, dissolution inhibiting group (ii), and a low molecular weight compound or polymer having the halogenated methyl etherified compound and an alkali-soluble group (i) It can be obtained by reacting with a compound.
- the polymer compound and the low-molecular compound for the photoresist composition are obtained by converting a methyl ether compound into a polymer having at least one substituent selected from an alcohol hydroxyl group, a carboxyl group, and a phenolic hydroxyl group. It can be obtained by reacting with a compound or a low molecular compound.
- the chloromethyl ether conjugate can be synthesized by the method shown in the following reaction formula. That is, paraformaldehyde is added to an alcohol compound, 2.0 to 3.0 equivalents of hydrogen chloride gas are blown into the alcohol compound, and the mixture is reacted at 40 to 100 ° C under hydrochloric acid. After completion of the reaction, the product is distilled under reduced pressure to obtain the desired chloromethyl ester. One tertiary dagger can be obtained.
- the high molecular compound in which the phenolic hydroxyl group is protected is, for example, the polyhydroxystyrene resin represented by the chemical formula (20). It can be obtained by reacting a halogenated methyl ether conjugate. Similarly, a low molecular weight compound having a protected phenolic hydroxyl group can be obtained by reacting the corresponding low molecular weight polyvalent phenol compound with the halogenated methyl ether compound.
- the high molecular compound in which the hydroxyl group is protected is, for example, the halogenated methyl ether compound is converted to a compound such as acrylic acid or methacrylic acid. It can be obtained by reacting with a saturated carboxylic acid and using the resulting unsaturated carboxylic acid ester as one monomer and polymerizing it with another monomer having a carboxyl group such as acrylic acid or methacrylic acid. it can.
- the low molecular weight compound in which the carboxyl group is protected can be obtained by reacting the corresponding bile acid or the like with the halogenated methyl ether conjugate.
- the high molecular compounds and low molecular compounds for photoresist compositions of the present invention include, for example, the above-mentioned fluoroalcohol-containing or alcohol-containing polymer and the above-mentioned methyl halide. It can be obtained by reacting an ethereal conjugate.
- a low molecular weight compound having an alcoholic hydroxyl group can be obtained by reacting the corresponding low molecular weight compound containing a fluorine alcohol or an alcohol containing polymer with the halogenated methyl etherified compound.
- the halogenated methyl ether compound obtained as described above has at least one alkali-soluble group (i) selected from the group consisting of an alcoholic hydroxyl group, a carboxyl group, and a phenolic hydroxyl group.
- Compound and low molecular compound for photoresist composition Can be obtained.
- the photoresist composition that works in the second aspect of the present invention comprises at least a base resin component (A) whose alkali solubility changes by the action of an acid, and an acid by irradiation with radiation.
- the acid generator (B) is used in an amount of 0.5 to 30 parts by mass with respect to 100 parts by mass of the base resin component.
- the resin component (A) is the above-mentioned polymer compound.
- this photoresist composition can further contain the aforementioned low molecular compound for a photoresist composition as an acid dissociable, dissolution inhibitor (C).
- the polymer compound has a hydrophilic acid dissociable, dissolution inhibiting group (ii) represented by the above general formula (1).
- a hydrophilic acid dissociable, dissolution inhibiting group (ii) represented by the above general formula (1).
- the chemical amplification type positive resist significantly changes the alkali solubility before and after exposure, and can provide a fine pattern with high resolution. Further, it is possible to prevent the resist pattern from being thinned. Further, the adhesion of the resist pattern to the substrate can be improved by the effect of the introduced hydrophilic group, and the development defect can be reduced by improving the affinity of the resist for an alkali developing solution.
- the low-molecular compound for a photoresist composition becomes a hydrophilic compound represented by the above general formula (1).
- a hydrophilic compound represented by the above general formula (1) Having an acidic acid-dissociable, dissolution-inhibiting group (ii), it exhibits an action of inhibiting dissolution in alkali development before exposure, and exhibits alkali solubility by deprotection after exposure and PEB process. Therefore, the chemical amplification type positive resist significantly changes the alkali solubility before and after exposure, and can provide a fine pattern with high resolution. In addition, film loss of the resist pattern can be prevented. Further, the effect of the introduced hydrophilic group can improve the adhesion of the resist pattern to the substrate, and can reduce development defects by improving the affinity of the resist for an alkali developing solution.
- the acid dissociable dissolution inhibitor (C) is used in an amount of usually 350 parts by mass, preferably 5 to 30 parts by mass, more preferably 5 to 15 parts by mass, based on 100 parts by mass of the base resin component (A). Used in parts by weight.
- Acid dissociable dissolution inhibitor (C) compounding power S Sensitivity deteriorates when it is within this range And the effect of improving the resolution and pattern shape without deteriorating the storage stability of the photoresist coating liquid.
- an acid generator (B) used in the photoresist composition of the present invention a known acid generator (B) used in common with a conventional chemically amplified resist composition and the like can be used. Can be used without particular limitation.
- an acid generator (B) there have hitherto been used an acid salt-based acid generator such as a rhododium salt or a sulfo-dum salt, an oxime sulfonate-based acid generator, a bisalkyl or bisaryl sulfo acid generator.
- diazomethane-based acid generators such as rudiazomethanes, poly (bissulfol) diazomethanes, diazomethane-trobenzylsulfonates, iminosulfonate-based acid generators, and disulfone-based acid generators are known.
- diphenyl dimethyl trifluoromethanesulfonate (4-methoxyphenyl) phenyl trifluoromethanesulfonate, bis (p- tert-Butylphenyl) eodo-dimethyltrifluoromethanesulfonate, triphenylsulfonic-dimethyltrifluoromethanesulfonate, (4-methoxyphenyl) diphenylsulfonic-dimethyltrifluoromethanesulfonate, (4-methylphenyl) Diphenylsulfo-dimethylnonafluorobutanesulfonate, (p-tert-butylphenyl) diphenylsulfo-dimethyltrifluoromethanesulfonate, diphenyl-sulfo-dimethylnonafluorobutanesulfonate, bis (p-tert-butylphenyl) diphenylsulfo
- a sulfonium salt having a fluorinated alkylsulfonic acid ion as an aon is preferable since it has an appropriate acid strength and a diffusivity in a resist film.
- the acid generator (B) may be used alone or in combination of two or more.
- the mixing amount is, for example, 0.5 to 30 parts by mass, preferably 1 to 20 parts by mass, and more preferably 3 to 15 parts by mass with respect to 100 parts by mass of the base resin component (A). When the amount of the acid generator (B) is within this range, a sufficient latent image can be formed without impairing the storage stability of the photoresist composition.
- the photoresist composition may further contain a nitrogen-containing compound (D), if necessary. It is already known to incorporate a small amount of a nitrogen-containing compound into a chemically amplified resist composition as an acid diffusion inhibitor or the like. In the present invention, such a known nitrogen-containing Compounds can be added. Examples of such nitrogen-containing compounds include amine-ammonia salts.
- Examples of the amine include aliphatic secondary amines such as getylamine, dipropylamine, dibutylamine, and dipentylamine; trimethylamine, triethylamine, tripropylamine, tributylamine, tripentylamine, N, N-dimethyl.
- Aliphatic tertiary amino acids such as propylamine, N-ethyl-N-methylbutylamine, trihexylamine, triheptylamine, trioctylamine, trilide-lamine, tridodecylamine and tritetrade-lamine.
- Amine (trialkylamine; the three alkyl groups bonded to nitrogen in the above may be the same or different); N, N-dimethylmonoethanolamine, triisopropanolamine, N, N- Cylmonoethanolamine, triethanolamine, tributanolamine Which tertiary alkanolamines; N, N-dimethylaline, N, N-getylaline, N-ethyl-N-methylaniline, N, N-dimethyltoluidine, N-methyldiphenylamine, N-ethyldiphenylamine, Aromatic tertiary amines such as trifluoramine can be mentioned.
- ammonium salt examples include quaternary ammonium ions such as ammonium ions, tetramethylammonium ions, tetraethylammonium ions, tetrapropylammonium ions, tetrapropylammonium ions, tetrapentylammonium ions, and tetrapentylammonium ions.
- Salts of an alkylammonium ion with an ion of an organic carboxylic acid having a hydroxyl group such as lactic acid can be mentioned.
- lower tertiary alkanolamines having 6 to 12 carbon atoms such as triethanolamine, triisopropanolamine, and tributanolamine, trihexylamine, triheptylamine, trioctylamine, tridecanylamine
- Trialkylamine having 6 to 15 carbon atoms, such as tridodecylamine and tritetradecanyluamine is preferred because it has an excellent effect of reducing film loss at the top of a fine resist pattern.
- the nitrogen-containing compound (D) is usually 0.01 to 5 parts by mass, preferably 0.05 to 3 parts by mass, more preferably 0.1 to 3 parts by mass, based on 100 parts by mass of the base resin component (A). Used in the range of 1-2 parts by mass.
- the compounding power of the nitrogen-containing compound (D) is within the above range, the effect of suppressing the diffusion of the acid generated by the exposure can be obtained, and the effect of improving the shape of the pattern can be obtained. It is possible to prevent so-called deterioration of exposure sensitivity due to the suppression.
- the photoresist composition of the present invention may further contain, as an optional component, an organic carboxylic acid or an oxo acid of phosphorus or an oxo acid of phosphorus for the purpose of, for example, preventing sensitivity deterioration due to the addition of the nitrogen-containing compound (D). Derivatives can be included.
- organic carboxylic acid for example, malonic acid, citric acid, malic acid, succinic acid, benzoic acid, salicylic acid and the like are suitable.
- the oxo acid of phosphorus or a derivative thereof includes phosphoric acid such as phosphoric acid, di-n-butyl ester phosphate, and difluorophosphate ester, and derivatives such as esters thereof; phosphonic acid, phosphonic acid Derivatives such as phosphonic acids and their esters, such as dimethyl ester, phosphonic acid-di-n-butyl ester, phenylphosphonic acid, phosphonic acid diphenyl ester, phosphonic acid dibenzyl ester; phosphinic acid, phenylphosphinic acid, etc. Derivatives such as phosphinic acids and their esters are preferred, of which phosphonic acids are particularly preferred.
- the organic carboxylic acid or the oxo acid of phosphorus or a derivative thereof is contained in an amount of 0.01 to 5.0 parts by mass, preferably 0.05 to 3 parts by mass, more preferably 0.05 to 3 parts by mass, per 100 parts by mass of the base resin component (A). Used in the range of 0.1 to 2 parts by mass. When the amount of the organic carboxylic acid or the oxo acid of phosphorus or a derivative thereof is within this range, it is possible to prevent sensitivity deterioration due to the addition of the nitrogen-containing compound (D).
- the photoresist composition of the present invention comprises the base resin component (A), the acid generator (B), the acid dissociable dissolution inhibitor (C), and the nitrogen-containing compound (D), which are further required.
- the optional components added according to are dissolved in an organic solvent and used as a uniform solution.
- organic solvents include ketones such as acetone, methyl ethyl ketone, cyclohexanone, methyl isoamyl ketone, and 2-heptanone; ethylene glycol, ethylene glycol monomonoacetate, and the like.
- organic solvents may be used alone or as a mixed solvent of two or more. Among them, propylene glycol monomethyl ether acetate (PGMEA) and ethyl lactate (EL) are preferred!
- the amount of the organic solvent is a concentration that can be applied to a substrate or the like in forming a photoresist film.
- the photoresist composition of the present invention may further contain, if desired, a miscible additive, for example, a known dissolution inhibitor, an additional resin for improving the performance of the photoresist film, and coatability.
- a miscible additive for example, a known dissolution inhibitor
- an additional resin for improving the performance of the photoresist film and coatability.
- Surfactants, plasticizers, stabilizers, coloring agents, antihalation agents and the like can be added to improve the toner content.
- the method of forming a resist pattern of the present invention comprises the steps of: forming a photoresist film on a substrate using such a photoresist composition; exposing the photoresist film to light; Forming a resist pattern by developing the photoresist film.
- the photoresist composition of the present invention forms a resist pattern by a usual lithography process. Specifically, first, a photoresist composition is applied on a substrate by spin coating or the like, and dried to form a resist film. Next, the substrate is selectively exposed through a mask pattern or exposed by electron beam drawing, and is heated after exposure. Finally, a resist pattern is formed by developing with an aqueous alkali solution. Note that post-beta processing may be further performed as necessary.
- Light sources include, but are not limited to, deep ultraviolet light with a power of 300 nm or less, specifically, KrF excimer laser, ArF excimer laser, F excimer laser, EUV (extreme ultraviolet light), electron beam, soft X-ray, X-ray Use lines etc.
- ArF excimer lasers and F excimer lasers are preferred.
- the conditions of the lithography process that is, the number of rotations of the resist coating, the pre-beta temperature, the exposure condition, the heating condition after exposure, and the alkali development condition may be those conventionally used so far.
- the rotational speed is about 500-5000 rpm, more specifically, about 1200-1500 rpm
- the pre-beta temperature is in the range of 70-130 ° C.
- Exposure may be performed through a mask.
- a known mask such as a normal binary mask or a phase shift mask is used.
- Heating temperature after exposure is in the range of 90- 140 ° C, alkali current image conditions, 1 one 5 weight 0 / oTMAH - by (tetramethylammonium Umuhidorokishido) developer, 15-30 ° C, especially 23 ° C Develop for 15-90 seconds, then rinse with water.
- resins represented by the following formulas (25)-(30) will be referred to as resins 116, respectively.
- 1-Chloromethoxy-2-methoxyethane represented by the following formula (24) is synthesized with a commercially available resin represented by the following formulas (25) and (26) synthesized by addition polymerization or radical polymerization.
- resin 3-6 which is a polymer compound of the present invention was obtained.
- Table 1 shows the chemical analysis results (weight average molecular weight, dispersity, and introduction rate of acid dissociable, dissolution inhibiting groups) of these resins 16.
- Organic anti-reflective coating composition “AR-19” (trade name, manufactured by Shipley) is applied on an 8-inch silicon wafer using a spinner, baked on a hot plate at 215 ° C for 90 seconds, and dried. By doing so, an organic antireflection film of 82 nm was formed. Then, a positive photoresist composition, which will be described later, is coated on the organic antireflection film using a spinner, pre-beta for 90 seconds at 110 ° C. on a hot plate, and dried to obtain a film thickness of 200 ⁇ m. Was formed.
- composition of positive photoresist [0072] Composition of positive photoresist:
- the yarn composition for a positive photoresist includes an acid generator, a quencher, and a solvent as shown below. Was prepared using
- Resin 3 100 parts by weight Acid generator: triphenylsulfo-dimethyl 'perfluorobutanesulfonate (TPS-PFBS) 2.0 parts by weight
- Quencher nitrogen-containing compound: triisopropanolamine 0.2 parts by mass
- Organic solvent propylene glycol monomethyl ether acetate (PGMEA)
- the positive-working photoresist composition containing resin 3 which is one example of the polymer compound of the present invention (Example 2), had a line-and-slice of 120 nm. A base pattern was obtained, and it became clear that the pattern shape exhibited rectangularity. The exposure amount at this time was 14 mjZcm 2 .
- the positive photoresist composition containing Resins 4 to 6 in Table 1 also obtained a line-and-space pattern of 120 nm, and the pattern shape was rectangular. .
- the alkali solubility before and after exposure greatly changes in a chemically amplified positive resist system, so that the pattern has less film loss and high resolution. It is useful for forming fine patterns of image quality, especially for KrF, ArF and F exposure.
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
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- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
Description
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US10/588,866 US7807328B2 (en) | 2004-02-20 | 2005-01-20 | Polymer compound, photoresist composition including the polymer compound, and resist pattern formation method |
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JP2004045521A JP2005232388A (ja) | 2004-02-20 | 2004-02-20 | 高分子化合物、該高分子化合物を含有するフォトレジスト組成物、およびレジストパターン形成方法 |
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JP2003295443A (ja) * | 2002-04-08 | 2003-10-15 | Sumitomo Chem Co Ltd | レジスト組成物 |
JP2003322970A (ja) * | 2002-04-26 | 2003-11-14 | Tokyo Ohka Kogyo Co Ltd | ポジ型レジスト組成物及びそれを用いたパターン形成方法 |
JP2004348106A (ja) * | 2003-04-28 | 2004-12-09 | Tokyo Ohka Kogyo Co Ltd | ホトレジスト組成物、該ホトレジスト組成物用低分子化合物および高分子化合物 |
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US6291130B1 (en) * | 1998-07-27 | 2001-09-18 | Fuji Photo Film Co., Ltd. | Positive photosensitive composition |
US6790587B1 (en) * | 1999-05-04 | 2004-09-14 | E. I. Du Pont De Nemours And Company | Fluorinated polymers, photoresists and processes for microlithography |
JP2001022072A (ja) * | 1999-07-07 | 2001-01-26 | Fuji Photo Film Co Ltd | 遠紫外線露光用ポジ型フォトレジスト組成物 |
US6596458B1 (en) * | 1999-05-07 | 2003-07-22 | Fuji Photo Film Co., Ltd. | Positive-working photoresist composition |
US6984482B2 (en) * | 1999-06-03 | 2006-01-10 | Hynix Semiconductor Inc. | Top-coating composition for photoresist and process for forming fine pattern using the same |
JP3988517B2 (ja) * | 2001-04-27 | 2007-10-10 | Jsr株式会社 | 感放射線性樹脂組成物 |
US6686429B2 (en) * | 2001-05-11 | 2004-02-03 | Clariant Finance (Bvi) Limited | Polymer suitable for photoresist compositions |
JP4300774B2 (ja) * | 2001-09-28 | 2009-07-22 | 住友化学株式会社 | ポジ型レジスト組成物 |
KR20030051194A (ko) * | 2001-09-28 | 2003-06-25 | 스미또모 가가꾸 고교 가부시끼가이샤 | 포지티브 내식막 조성물 |
US7198880B2 (en) * | 2002-04-26 | 2007-04-03 | Fujifilm Corporation | Positive resist composition |
US7217492B2 (en) * | 2002-12-25 | 2007-05-15 | Jsr Corporation | Onium salt compound and radiation-sensitive resin composition |
TW200503988A (en) * | 2003-06-09 | 2005-02-01 | Idemitsu Petrochemical Co | Adamantyl vinyl ether compound and production process for the same |
JP4533639B2 (ja) * | 2003-07-22 | 2010-09-01 | 富士フイルム株式会社 | 感刺激性組成物、化合物及び該感刺激性組成物を用いたパターン形成方法 |
JP4499591B2 (ja) * | 2005-03-23 | 2010-07-07 | 東京応化工業株式会社 | 厚膜形成用化学増幅型ポジ型ホトレジスト組成物 |
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JP2003295443A (ja) * | 2002-04-08 | 2003-10-15 | Sumitomo Chem Co Ltd | レジスト組成物 |
JP2003322970A (ja) * | 2002-04-26 | 2003-11-14 | Tokyo Ohka Kogyo Co Ltd | ポジ型レジスト組成物及びそれを用いたパターン形成方法 |
JP2004348106A (ja) * | 2003-04-28 | 2004-12-09 | Tokyo Ohka Kogyo Co Ltd | ホトレジスト組成物、該ホトレジスト組成物用低分子化合物および高分子化合物 |
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KR100801047B1 (ko) | 2008-02-04 |
US7807328B2 (en) | 2010-10-05 |
US20070172757A1 (en) | 2007-07-26 |
KR20060118002A (ko) | 2006-11-17 |
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