WO2006008934A1 - レジスト組成物およびレジストパターン形成方法 - Google Patents
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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- WO2006008934A1 WO2006008934A1 PCT/JP2005/012057 JP2005012057W WO2006008934A1 WO 2006008934 A1 WO2006008934 A1 WO 2006008934A1 JP 2005012057 W JP2005012057 W JP 2005012057W WO 2006008934 A1 WO2006008934 A1 WO 2006008934A1
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- 150000004292 cyclic ethers Chemical class 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- YLFBFPXKTIQSSY-UHFFFAOYSA-N dimethoxy(oxo)phosphanium Chemical compound CO[P+](=O)OC YLFBFPXKTIQSSY-UHFFFAOYSA-N 0.000 description 1
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 description 1
- ODQWQRRAPPTVAG-GZTJUZNOSA-N doxepin Chemical compound C1OC2=CC=CC=C2C(=C/CCN(C)C)/C2=CC=CC=C21 ODQWQRRAPPTVAG-GZTJUZNOSA-N 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- BQUDLWUEXZTHGM-UHFFFAOYSA-N ethyl propaneperoxoate Chemical compound CCOOC(=O)CC BQUDLWUEXZTHGM-UHFFFAOYSA-N 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229940083124 ganglion-blocking antiadrenergic secondary and tertiary amines Drugs 0.000 description 1
- VPVSTMAPERLKKM-UHFFFAOYSA-N glycoluril Chemical compound N1C(=O)NC2NC(=O)NC21 VPVSTMAPERLKKM-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940057867 methyl lactate Drugs 0.000 description 1
- CWKLZLBVOJRSOM-UHFFFAOYSA-N methyl pyruvate Chemical compound COC(=O)C(C)=O CWKLZLBVOJRSOM-UHFFFAOYSA-N 0.000 description 1
- OOHAUGDGCWURIT-UHFFFAOYSA-N n,n-dipentylpentan-1-amine Chemical compound CCCCCN(CCCCC)CCCCC OOHAUGDGCWURIT-UHFFFAOYSA-N 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- DIOQZVSQGTUSAI-UHFFFAOYSA-N n-butylhexane Natural products CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- IZJVVXCHJIQVOL-UHFFFAOYSA-N nitro(phenyl)methanesulfonic acid Chemical compound OS(=O)(=O)C([N+]([O-])=O)C1=CC=CC=C1 IZJVVXCHJIQVOL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000005593 norbornanyl group Chemical group 0.000 description 1
- CDXVUROVRIFQMV-UHFFFAOYSA-N oxo(diphenoxy)phosphanium Chemical compound C=1C=CC=CC=1O[P+](=O)OC1=CC=CC=C1 CDXVUROVRIFQMV-UHFFFAOYSA-N 0.000 description 1
- RQKYHDHLEMEVDR-UHFFFAOYSA-N oxo-bis(phenylmethoxy)phosphanium Chemical compound C=1C=CC=CC=1CO[P+](=O)OCC1=CC=CC=C1 RQKYHDHLEMEVDR-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- RVZRBWKZFJCCIB-UHFFFAOYSA-N perfluorotributylamine Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)N(C(F)(F)C(F)(F)C(F)(F)C(F)(F)F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F RVZRBWKZFJCCIB-UHFFFAOYSA-N 0.000 description 1
- MLCHBQKMVKNBOV-UHFFFAOYSA-N phenylphosphinic acid Chemical compound OP(=O)C1=CC=CC=C1 MLCHBQKMVKNBOV-UHFFFAOYSA-N 0.000 description 1
- 150000003003 phosphines Chemical class 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 150000003007 phosphonic acid derivatives Chemical class 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 description 1
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- SWZDQOUHBYYPJD-UHFFFAOYSA-N tridodecylamine Chemical compound CCCCCCCCCCCCN(CCCCCCCCCCCC)CCCCCCCCCCCC SWZDQOUHBYYPJD-UHFFFAOYSA-N 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- Resist composition and resist pattern forming method Resist composition and resist pattern forming method
- the present invention relates to a resist composition used in a resist pattern forming method including an immersion lithography (immersion exposure) step, and a resist pattern forming method using the resist composition.
- a lithography method is frequently used for the production of fine structures in various electronic devices such as semiconductor devices and liquid crystal devices.
- light sources using shorter wavelength light sources such as F laser, EUV (extreme ultraviolet light), EB (electron beam), X-rays, etc.
- Immersion lithography uses a solvent having a refractive index larger than the refractive index of air in a portion between a lens and a resist layer on the wafer, which is conventionally filled with an inert gas such as air or nitrogen, during exposure.
- an inert gas such as air or nitrogen
- exposure is performed in a state filled with a solvent such as pure water or a fluorine-based inert liquid.
- Immersion lithography can be performed using an existing exposure apparatus.
- Immersion Lithography is expected to be able to form resist patterns with low cost, high resolution, and excellent depth of focus, and in the manufacture of semiconductor devices that require large capital investment.
- cost and lithography characteristics such as resolution, the semiconductor industry is attracting a great deal of attention.
- Non-Patent Literature 1 Journal of Vacuum Science & Technology B (USA), 1999, Vol. 17, No. 6, pages 3306-3309
- Non-Patent Document 2 Journal of Vacuum Science & Technology B (USA), 2001, 19th, 6th, 2353-2 356
- Non-Patent Document 3 Proceedings of SPIE (USA) 2002, 4691, 459-465
- the solvent contacts the resist layer and the lens during exposure.
- the resist layer changes in quality due to elution of the substance contained in the resist into the solvent, etc., and the performance of the resist layer deteriorates, the refractive index of the solvent changes locally due to the eluted substance, or the eluted substance is found on the lens surface.
- Contamination of the resist pattern may adversely affect resist pattern formation. In other words, problems such as deterioration in sensitivity, the resulting resist pattern having a T-top shape, and surface roughness and swelling of the resist pattern are expected.
- the present invention has been made in view of the above circumstances, and is provided by immersion lithography. It is an object of the present invention to provide a resist composition capable of reducing substance elution into a solvent used in the process, and a resist pattern forming method using the resist composition. Means for solving the problem
- the present inventors have at least one solvent (cl) selected from the group consisting of 2-heptanone and lactic acid ethyl ester as a main component.
- the present inventors have found that the organic solvent (C) to be used is a solvent with little elution into the solvent used in the immersion lithography process, and completed the present invention.
- the first aspect (aspect) of the present invention is a resist composition used in a resist pattern forming method including a step of immersion exposure, wherein the resin component (A) whose alkali solubility is changed by the action of an acid.
- a second aspect (aspect) of the present invention is a resist pattern forming method using the resist composition of the first aspect, and includes a step of immersion exposure. is there.
- the resist composition and the resist pattern forming method of the present invention it is possible to reduce elution of a substance into a solvent (hereinafter sometimes referred to as an immersion medium) used in an immersion lithography process.
- a solvent hereinafter sometimes referred to as an immersion medium
- the resist composition of the present invention is a resist composition used in a resist pattern forming method including a step of immersion exposure, and is a resin component whose alkali solubility is changed by the action of an acid (A) (hereinafter referred to as component (A) At least one selected from the group consisting of an acid generator component that generates acid upon exposure (B) (hereinafter also referred to as component (B)), and 2-heptanone and ethyl lactylate. It contains an organic solvent (C) whose main component is a seed solvent (cl) (hereinafter sometimes referred to as component (C)). [0008] ⁇ (Eight) component>
- Component (A) is not particularly limited, and one or more types of alkali-soluble resins or alkali-soluble resins that have been proposed as base resins for chemically amplified resists have been proposed so far. Can be used.
- the former is a so-called negative type resist composition, and the latter is a so-called positive type resist composition.
- a crosslinking agent is blended in the resist composition together with the alkali-soluble resin and the component (B).
- a strong acid acts to cause cross-linking between the alkali-soluble resin and the cross-linking agent, thereby changing to alkali-insoluble.
- alkali-soluble resin ⁇ - (hydroxyalkyl) acrylic acid or a resin having a unit derived from at least one selected from lower alkyl ester power of ⁇ (hydroxyalkyl) acrylic acid is immersed in exposure. Can form a good resist pattern with less swelling.
- cross-linking agent for example, an amino-based cross-linking agent that is hardly soluble in a solvent for immersion exposure such as glycoluril having a methylol group or an alkoxymethyl group, particularly a butoxymethyl group is usually used. A good resist pattern with less swelling can be formed during exposure, which is preferable.
- the amount of the crosslinking agent is 10%.
- a range of 1 to 50 parts by mass is preferable with respect to 0 parts by mass.
- the component ( ⁇ ) is an alkali-insoluble one having a so-called acid dissociable, dissolution inhibiting group, and when an acid is generated from the component ( ⁇ ) upon exposure, a strong acid is converted into the acid. By dissociating the dissociable dissolution inhibiting group, the component (ii) becomes alkali-soluble.
- the component (ii) preferably contains a structural unit that also induces (a-lower alkyl) acrylic acid ester force, in both cases of positive type and negative type.
- the “structural unit” means a monomer unit (monomer unit) constituting the polymer.
- the “lower alkyl) acrylate ester” means one or both of an acrylate ester and an ⁇ - lower alkyl acrylate ester such as a methacrylate ester.
- the lower alkyl group as a substituent at the ⁇ -position of “( ⁇ -lower alkyl) acrylic acid ester” is an alkyl group having 1 to 5 carbon atoms, specifically, a methyl group or an ethyl group.
- (a-lower alkyl) acrylic ester force-derived structural unit means a structural unit formed by cleavage of the ethylenic double bond of (a-lower alkyl) acrylic ester.
- a preferable resist composition is obtained when the component (A) contains a structural unit that also induces a -lower alkyl) acrylic acid ester power, preferably at least 20 mol%, more preferably at least 50 mol%. Is desirable.
- the component (A) preferably has a structural unit (al) derived from an (ex lower alkyl) acrylate ester group having an acid dissociable, dissolution inhibiting group. .
- the acid-dissociable, dissolution-inhibiting group in the structural unit (al) has an alkali dissolution-inhibiting property that makes the entire component (A) insoluble before exposure, and (B) the action of the generated acid after exposure. It can be used without particular limitation as long as it can be dissociated by (1) to change the entire component (A) into alkali-soluble.
- a carboxyl group of (meth) acrylic acid and a group forming a cyclic or chain tertiary alkyl ester, a tertiary alkoxy group, or a chain alkoxyalkyl group are widely known. It has been.
- “(Meth) acrylic acid ester” means one or both of acrylic acid ester and methacrylic acid ester.
- an acid dissociable, dissolution inhibiting group containing an aliphatic cyclic group can be preferably used.
- the term “aliphatic” in the present invention is a relative concept with respect to aromatics, and is defined to mean groups, compounds, etc. that do not have aromaticity.
- the term “aliphatic cyclic group” means that it has no aromaticity !, a monocyclic group or a polycyclic group (alicyclic group). In this case, the “aliphatic cyclic group” It is not limited to a group consisting of carbon and hydrogen (hydrocarbon group)
- hydrocarbon group It is preferably a 1S hydrocarbon group.
- the “hydrocarbon group” may be either saturated or unsaturated, but is usually preferably saturated.
- a polycyclic group (alicyclic group) is preferred.
- Such an aliphatic cyclic group include, for example, a monocycloalkane, bicycloalkane, tricycloalkane, which may or may not be substituted with a fluorine atom or a fluorinated alkyl group, Examples include groups in which one hydrogen atom has been removed from a teracycloalkane. Specific examples include monocycloalkanes such as cyclopentane and cyclohexane, and groups obtained by removing one hydrogen atom from polycycloalkanes such as adamantane, norbornane, isobornane, tricyclodecane, and tetracyclododecane.
- Such monocyclic or polycyclic groups can be used by appropriately selecting the intermediate forces proposed in large numbers in ArF resists.
- a cyclopentyl group, a cyclohexyl group, an adamantyl group, a norbornyl group, and a tetracyclododecanyl group are preferable from an industrial viewpoint, and an adamantyl group is particularly preferable.
- examples of the structural unit (al) include structural units represented by the following general formulas (al-1) to (al-9).
- R is a hydrogen atom or an ⁇ -lower alkyl group, and R 1 is a lower alkyl group.
- R is a hydrogen atom or a-lower alkyl group, and R 2 and R 3 are each independently a lower alkyl group.
- R is a hydrogen atom or an ⁇ -lower alkyl group.
- R is a hydrogen atom or an ⁇ -lower alkyl group, and R 5 is a methyl group.
- R is a hydrogen atom or an ⁇ -lower alkyl group.
- R is a hydrogen atom or an ⁇ lower alkyl group
- R 7 is a lower alkyl group.
- the above and R 6 to R 7 are each a lower straight chain or branched chain having 1 to 5 carbon atoms. Examples include methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl, isopentyl, neopentyl and the like, which are preferably alkyl groups. Industrially, a methyl group or an ethyl group is preferred.
- R 4 is a tertiary alkyl group such as tert butyl group or tert-amyl group, and ter t butyl group is preferred industrially!
- structural unit (al) among the structural units listed above, structural units represented by general formulas (al—l), (al—2), (a 1-3), (al-6) Is more preferable because it can form a pattern having excellent resistance to dissolution in a solvent used in the immersion lithography process and high resolution.
- one type may be used alone, or two or more types may be used in combination. May be.
- the proportion of the structural unit (al) in the component (A) is preferably 5 to 60 mol%, more preferably 5 to 50 mol%, based on the total of all the structural units of the component (A).
- the component (A) has, in addition to the structural unit (al), a structural unit (a2) derived from an acrylate ester having a latathone-containing monocyclic or polycyclic group (ex-lower alkyl). It is preferable.
- the lathetone-containing monocyclic or polycyclic group of the structural unit (a2) is used when the component (A) is used for forming a photoresist film to improve the adhesion of the resist film to the substrate or to improve the hydrophilicity with the developer. It is effective in improving the sex.
- the rataton here means one ring containing the -o-c (o)-structure, and this is counted as the ring of one eye. Therefore, in the case of only a rataton ring, it is called a monocyclic group, and when it has another ring structure, it is called a polycyclic group regardless of the structure.
- any unit can be used without any particular limitation as long as it has both such a structure of rataton (10—C (O) —) and a cyclic group.
- examples of the latathone-containing monocyclic group include a group except one y-petit-orata latonic force hydrogen atom
- examples of the latathone-containing polycyclic group include a bicycloalkane having a latathone ring
- Examples of tricycloalkane and tetracycloalkane forces include groups in which one hydrogen atom has been removed.
- a group obtained by removing one hydrogen atom from a latatatone-containing tricycloalkane having the following structural formula (IV) or structural formula (V) is advantageous in terms of industrial availability. is there.
- Examples of the structural unit (a2) include structural units derived from acrylate esters containing a latathone-containing monocycloalkyl group or a tricycloalkyl group ( ⁇ -lower alkyl group).
- examples of the structural unit (a2) include structural units represented by the following general formulas (a2—l) to (a2-5).
- R ′ is a hydrogen atom or a lower alkyl group.
- R ′ is a hydrogen atom or a lower alkyl group.
- This structural unit exists as a mixture of isomers at the 5- or 6-position.
- R is a hydrogen atom or a lower alkyl group
- R 8 and R 9 are each independently a hydrogen atom or a lower alkyl group.
- R ′ is a hydrogen atom or a lower alkyl group, and o is 0 or 1.
- R ′ is a hydrogen atom or a lower alkyl group
- the lower alkyl group for R ′ is the above structural unit.
- R 8 and R 9 are each independently a hydrogen atom or a lower alkyl group, and a hydrogen atom is preferable in view of industrial availability.
- R 8 and R 9 are each independently a hydrogen atom or a lower alkyl group, and a hydrogen atom is preferable in view of industrial availability.
- the structural units represented by the general formulas (a2-l) to (a2-5) when used as a resist composition, the effect of suppressing the proximity effect is reduced.
- Etc., ⁇ -butyrolatatin ester of acrylic acid which is represented by the general formula (a2-3) having an ester bond to the ex carbon on the Lataton skeleton, ie, (a-lower alkyl) of ⁇ -butyrolatatin
- a structural unit that also induces acrylate power is preferred.
- the norbornane rataton ester of a general formula (a2-l) or (a2-2)-(lower alkyl) acrylic acid that is, an (a lower alkyl) acrylic acid ester of norbornane rataton, etc.
- the derived structural unit is preferable because the shape of the resist pattern obtained when used in the resist composition, for example, rectangularity is further improved.
- the structural unit represented by the general formula (a2-2) is preferable because its effect is extremely high. Of these, the structural unit represented by the general formula (a2-3) is most preferred.
- the component (A) as the structural unit (a2), only one type may be used, or two or more types different from each other may be used in combination. It is preferable to introduce two or more different rataton skeletons into the skeleton of the component (A), since the adhesion of the photoresist film to the substrate, the affinity with the alkaline developer and the etching resistance are further improved.
- the proportion of the structural unit (a2) is preferably from 5 to 80 mol%, more preferably from 5 to 60 mol%, based on the total of all the structural units constituting the component (A). By setting it to the lower limit value or more, the effect of containing the structural unit (a2) can be sufficiently obtained, and by setting it to the upper limit value or less, it is possible to balance with other structural units.
- the component (A) is an ( ⁇ lower alkyl) alkyl further containing a polar group-containing aliphatic hydrocarbon group in addition to the structural unit (al) or in addition to the structural units (al) and (a2). It is preferable to have a structural unit ( a 3) derived from a rylate ester. By having the structural unit (a3), the hydrophilicity of the component (A) is increased, the affinity with the developer is increased, the alkali solubility in the exposed area is improved, and the resolution is improved. .
- Examples of the polar group include a hydroxyl group and a cyan group, and a hydroxyl group is particularly preferable.
- Examples of the aliphatic hydrocarbon group include a linear or branched hydrocarbon group (alkylene group) having 1 to 10 carbon atoms and a polycyclic aliphatic hydrocarbon group (polycyclic group).
- the polycyclic As a group for example, many proposals have been made for resins for resist compositions for ArF excimer lasers, and they can be appropriately selected and used.
- a structural unit that contains a hydroxyl group, a cyano group, or a carboxyl group-containing aliphatic polycyclic group and that also induces (meth) acrylic acid ester power is more preferable.
- the polycyclic group include groups in which one or more hydrogen atoms have been removed from bicycloalkane, tricycloalkane, tetracycloalkane or the like. Specific examples include groups in which one or more hydrogen atoms have been removed from a polycycloalkane such as adamantane, norbornane, isobornane, tricyclodecane or tetracyclododecane.
- Such polycyclic groups can be appropriately selected and used for the polymers (resin components) for resist compositions for ArF excimer lasers that have been proposed in large numbers.
- an adamantyl group, a norbornyl group, and a tetracyclododecanyl group are industrially preferable.
- the structural unit (a3) when the hydrocarbon group in the polar group-containing aliphatic hydrocarbon group is a linear or branched hydrocarbon group having 1 to 10 carbon atoms, a -lower alkyl) alkyl is used. Preferred is a structural unit derived from hydroxyethyl ester power of lauric acid, and when the hydrocarbon group is a polycyclic group, structural units represented by the following formulas (a3-l) and (a3-2) are preferred. It is mentioned as a thing.
- R ′ is the same as above, and n is an integer of 1 to 3.
- n 1 and the hydroxyl group is bonded to the 3-position of the adamantyl group are preferable.
- R ′ is the same as defined above, and k is an integer of 1 to 3.
- the structural unit (a3) is not an essential component of the component (A)! / ⁇ , but when it is included in the component (A), it is based on the total of all structural units constituting the component (A). Te, from 5 to 50 mole 0/0, preferably 1
- the content is preferably 0 to 40 mol%.
- Component (A) is within the range of not impairing the effects of the present invention, and the structural units (al) to (a3
- the structural unit (a4) for example, a structural unit containing a non-acid-dissociable aliphatic polycyclic group and derived from a (lower alkyl) acrylate ester is preferable.
- a structural unit when used for a positive resist composition, a solution from an isolated pattern to a semi-dense pattern (a line-and-space pattern having a space width of 1.2 to 2 with respect to a line width of 1) is obtained. It is excellent in image properties and is preferable.
- Examples of the polycyclic group include those similar to those exemplified in the case of the structural unit (a3), and are conventionally known as ArF positive resist materials! Many powers can be selected and used as appropriate.
- tricyclodecanyl group Especially selected from tricyclodecanyl group, adamantyl group, tetracyclododecyl group It is preferable that at least one type is industrially easily available.
- the following general formulas (a4-1) to (a4-3) are preferred.
- Powerful structural unit (a4) is not an essential component of component (A), but when it is contained in component (A), it is based on the total of all structural units constituting component (A). Te, the structural unit (a4) a 1 - 30 mole 0/0, since preferably the 10 to 20 mol 0/0, per cent, a good improvement effect Te is obtained in the resolution of the isolated pattern forces also Semidensupa turn Favored ,.
- the component (A) can be easily prepared by copolymerizing monomers corresponding to the respective structural units by a known radical polymerization using a radical polymerization initiator such as azobisisobutyl-tolyl (AIBN). Can be manufactured.
- a radical polymerization initiator such as azobisisobutyl-tolyl (AIBN).
- the mass average molecular weight of the component (A) is particularly limited, so it is preferable to have a strength of 2000 to 30000 force, and in the case of a ga type, more preferable to 2000 to 20000 force. 4,000 to 15000 force S is more preferable, and in the case of positive type, it is more preferable than 5,000 to 30000 force S, more preferably 8000 to 20000 force S. If it is larger than this range, the solubility in a resist solvent will deteriorate, and if it is small, the dry etching resistance and resist pattern cross-sectional shape may be deteriorated.
- the component (ii) can be used without particular limitation from the known acid generators used in conventional chemically amplified resist compositions.
- acid generators examples include onium salt acid generators such as ododonium salts and sulfone salts, oxime sulfonate acid generators, bisalkyl or bisarylsulfol-diazomethanes, There are various known diazomethane acid generators such as (bissulfol) diazomethanes, nitrobenzyl sulfonate acid generators, iminosulfonate acid generators, disulfone acid generators, and the like.
- onium salt acid generators such as ododonium salts and sulfone salts, oxime sulfonate acid generators, bisalkyl or bisarylsulfol-diazomethanes
- diazomethane acid generators such as (bissulfol) diazomethanes, nitrobenzyl sulfonate acid generators, iminosulfonate acid generators, disulfone acid generators, and the
- sodium salt-based acid generator examples include trifluoromethane sulfonate or nonafluorobutane sulfonate of diphenylodium, trifluoromethanesulfonate or nona of bis (4-tert butylphenol) ododonium.
- oxime sulfonate-based acid generator examples include ⁇ - ( ⁇ -toluenesulfo-loxyimino) -benzyl cyanide, ⁇ - ( ⁇ -chlorobenzenesulfo-loximino) -benzyl cyanide, ⁇ - (4 -Nitrobenzenesulfo-loxyimino) -benzyl cyanide, ⁇ - (4-nitro-2-trifluoromethylbenzenesulfonyloxymino) -benzyl cyanide, ⁇ - (benzenesulfo-loxyimino) -4-chloro Oral benzil cyanide, ⁇ - (Benzenesulfo-Luximinomino)-2,4-Dichlorobenzil cyanide, ⁇ - (Benzenesulfoyloximino)-2,6-Dichlorobenzil cyanide, ⁇ - (Benzenesulfo
- bisalkyl or bisarylsulfol diazomethanes include bis (isopropylsulfol) diazomethane, bis ( ⁇ -toluenesulfol) diazomethane, bis (1, Examples thereof include 1-dimethylethylsulfol) diazomethane, bis (cyclohexylsulfol) diazomethane, and bis (2,4 dimethylphenylsulfonyl) diazomethane.
- Poly (bissulfonyl) diazomethanes include, for example, 1,3 bis (phenylsulfo-diazomethylsulfol) propane (a compound with a structure shown below), decomposition point 135 ° C.
- one type of these acid generators may be used alone, or two or more types may be used in combination.
- the content of the component (B) is preferably 1 to 10 parts by mass, more preferably 0.5 to 30 parts by mass with respect to 100 parts by mass of the polymer compound (A). If the amount is less than the above range, pattern formation may not be performed sufficiently, and if the range is exceeded, it is difficult to obtain a uniform solution and storage stability is difficult. There is a possibility that it may cause a decrease in performance.
- the component (C) needs to contain at least one solvent (cl) selected from the group consisting of 2-heptanone and lactylethyl acetate as a main component.
- a solvent (cl) selected from the group consisting of 2-heptanone and lactylethyl acetate.
- the content of the solvent (cl) as the main component in the component (C) is preferably 50 to: LOO% by mass, more preferably 80 to: more preferably LOO% by mass, and more preferably 90 to LOO% by mass. Most preferably, it is 100% by mass, that is, it is preferable that the component (C) can only be a solvent (cl).
- the solvent (cl) either 2-heptanone or ethyl lactate may be used alone, or both may be used in combination.
- 2-heptanone is particularly preferred because it is difficult to elute in an immersion medium.
- the component (C) may contain a solvent (c2) other than the solvent (cl).
- the solvent (c2) is not particularly limited as long as it can dissolve each component to be used and can be made into a uniform solution without impairing the effects of the present invention. Any one or more of them can be appropriately selected and used.
- Examples of the solvent (c2) include ketones other than 2-heptanone, such as ⁇ -butarate rataton, acetone, methyl ethyl ketone, cyclohexanone, and methyl isoamyl ketone, ethylene glycol, and ethylene glycol.
- solvents (c2) may be used alone or as a mixed solvent of two or more.
- 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 of the composition is in the range of 2 to 20% by mass, preferably 5 to 15% by mass.
- a nitrogen-containing organic compound (D) (hereinafter referred to as the (D) component, and U) can be added.
- Amines particularly secondary lower aliphatic amines, are preferably tertiary lower aliphatic amines. .
- the lower aliphatic amine refers to an alkyl or alkyl alcohol amine having 12 or less carbon atoms.
- the secondary and tertiary amines include trimethylamine, jetylamine, triethylenoamine, diamine.
- examples include propylamine, tri-n-propylamine, tri-n-pentylamine, tri-n-dodecylamine, tri-n-octylamine, diethanolamine, triethanolamine, and triisopropanol.
- aliphatic tertiary amines having an alkyl group having 5 to 12 carbon atoms are preferred, and tri-n-year-old cutylamine is particularly preferred.
- R 11 R 12 each independently represents a lower alkylene group, and R 13 represents a lower alkyl group.
- the scale 11 , R 12 and R 13 may be linear, branched or cyclic, but are preferably linear or branched.
- R 12 and R 13 each have 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, from the viewpoint of molecular weight adjustment. 1 , R 12 and R 13 may have the same or different carbon numbers. Measure 11 , The structure of R may be the same or different.
- Examples of the compound represented by the general formula (VI) include tris- (2-methoxymethoxyethyl) amine, tris-2- (2-methoxy (ethoxy)) ethylamine, and tris- (2- (2-methoxyethoxy). Methoxyethyl) amine and the like. Of these, tris-1- (2-methoxy (ethoxy)) ethylamine is preferable.
- components (D) are usually used in the range of 0.01 to 5.0% by mass with respect to component (A).
- an organic carboxylic acid is further added as an optional component for the purpose of preventing sensitivity deterioration due to the blending of the component (D) and improving the resist pattern shape and stability of placement.
- An acid or phosphorus oxoacid or a derivative thereof (E) (hereinafter referred to as (E) component) can be contained.
- the 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.
- the resist composition of the present invention can be produced by dissolving the component (A), the component (B) and other optional components in the component (C).
- the above-described components may be mixed and stirred by ordinary methods, and may be dispersed and mixed using a disperser such as a dissolver, a homogenizer, or a three-roll mill, if necessary. Further, after mixing, it may be further filtered using a mesh, a membrane filter or the like.
- a resist composition useful for the present invention is applied on a substrate such as silicon wafer with a spinner or the like, and then pre-beta (PAB treatment) is performed.
- PAB treatment pre-beta
- a two-layer laminate in which an organic or inorganic antireflection film is provided between the substrate and the coating layer of the resist composition can also be used.
- it can be a two-layer laminate in which an organic antireflection film is provided on the resist composition coating layer, and further a three-layer laminate in which a lower antireflection film is provided.
- the steps so far can be performed using a known method.
- the operating conditions and the like are preferably set as appropriate according to the composition and characteristics of the resist composition to be used.
- immersion exposure Liquid Immersion Lithography
- the space between the resist layer and the lens at the lowest position of the exposure apparatus is filled with a solvent having a refractive index larger than the refractive index of air, but is larger than the refractive index of air and higher than the refractive index of the resist layer. It is preferable to perform exposure in a state filled with a solvent having a small refractive index.
- the wavelength used for the exposure is not particularly limited.
- ArF excimer laser, KrF excimer laser, F laser, EUV (extreme ultraviolet), VUV (vacuum ultraviolet), electron beam, X-ray, soft X-ray Any radiation can be used.
- the resist composition useful in the present invention is effective for KrF or ArF excimer lasers, particularly ArF excimer lasers.
- the resist layer and the lens at the lowest position of the exposure apparatus are filled with a solvent larger than the refractive index of air during exposure.
- Examples of the solvent having a refractive index larger than that of air include water and a fluorine-based inert liquid.
- fluorine-based inert liquid examples include C HC1 F, C F OCH, C F OC H
- the boiling point is preferably 70 to 180 ° C, more preferably 80 to 160 ° C.
- Specific examples of the perfluoroalkyl compound include a perfluoroalkyl ether compound and a perfluoroalkylamine compound. More specifically, examples of the perfluoroalkyl ether compound include perfluoro (2-butyl monotetrahydrofuran) (boiling point: 102 ° C.). Examples of the perfluoroalkylamine compound include: Perfluorotributylamine (boiling point 174 ° C).
- fluorine-based inert liquids those having a boiling point in the above range are preferable because the immersion medium can be removed after exposure by a simple method.
- the immersion medium is preferably water. Water is also preferred from the viewpoint of cost, safety, environmental issues and versatility.
- PEB post-exposure heating
- an alkaline developer such as an alkaline aqueous solution.
- water rinsing is preferably performed using pure water.
- water is dropped or sprayed on the substrate surface while rotating the substrate to wash away the developer on the substrate and the resist composition dissolved by the developer.
- a resist pattern in which the coating film of the resist composition is patterned into a shape corresponding to the mask pattern is obtained.
- an immersion medium is used. Since the elution amount of component (c) into the body is small, substance elution into the immersion medium used in the immersion lithography process can be reduced. Therefore, contamination of the immersion medium is reduced, thereby reducing changes in the properties of the immersion medium, for example local changes in the refractive index. Further, contamination of the lens of the exposure apparatus is reduced. Furthermore, since the elution of the component (C) is reduced and the change in the resist composition is reduced, it is presumed that the change in the performance of the resist layer is also suppressed.
- component (A), component (B), and component (D) were uniformly dissolved in component (C) to prepare positive resist composition 1.
- the prepared component (A) had a mass average molecular weight of 10,000.
- the component (B) includes trisulfol sulfone nonafluorobutane sulfonate 9.0 An amount was used.
- component (C) 1250 parts by mass of ethyl lactate (hereinafter abbreviated as “EL”) was used.
- component (D) 1.0 part by mass of tri-n-octylamine was used.
- the positive resist composition 1 is applied onto a silicon wafer having a diameter of 8 inches using a spinner, pre-betaed on a hot plate at 130 ° C. for 90 seconds, and dried to obtain a film thickness of 200 nm.
- the resist layer was formed.
- a resist layer is formed in the same manner as described above, and open frame exposure is performed with an ArF excimer laser (193 nm) at an exposure amount of 30 iujZcm 2 using a simple exposure apparatus VUVES4500 (manufactured by RISOTEC Japan Co., Ltd.). (Exposure through a mask).
- Example 1 a positive resist composition was prepared in the same manner as in Example 1 except that 1250 parts by mass of 2-heptanone (hereinafter abbreviated as “HP”) was used as the component (C). A similar evaluation was conducted. The results are shown in Table 1.
- HP 2-heptanone
- Example 1 positive polarity was obtained in the same manner as in Example 1 except that 1250 parts by mass of propylene glycol monomethyl etherate (hereinafter abbreviated as “PM”) was used as component (C).
- PM propylene glycol monomethyl etherate
- a mold resist composition was prepared and evaluated in the same manner. The results are shown in Table 1.
- PE propylene glycol monomethyl ether
- a positive resist composition was prepared in the same manner as in Example 1, and the same evaluation was performed. The results are shown in Table 1.
- the amount of elution before exposure is for evaluating the amount of elution in an unexposed area when a resist pattern is formed by performing selective exposure.
- the amount of elution after exposure is for evaluating the amount of elution in the exposed area. Therefore, in Examples 1 and 2, since the elution amount of component (C) was small relative to the immersion medium (water) both before and after exposure, Examples 1 and 2 It is clear that the resist composition of Example 2 can be suitably used for a resist pattern forming method including a step of immersion exposure.
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Abstract
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Citations (9)
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WO1999049504A1 (fr) * | 1998-03-26 | 1999-09-30 | Nikon Corporation | Procede et systeme d'exposition par projection |
JP2000338681A (ja) * | 1999-05-31 | 2000-12-08 | 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 |
JP2001022070A (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 |
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 |
JP2001042534A (ja) * | 1999-07-26 | 2001-02-16 | 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 |
JP2001142212A (ja) * | 1999-11-11 | 2001-05-25 | Fuji Photo Film Co Ltd | ポジ型フォトレジスト組成物 |
JP2002357905A (ja) * | 2001-03-28 | 2002-12-13 | Sumitomo Chem Co Ltd | レジスト組成物 |
JP2003057825A (ja) * | 2001-08-16 | 2003-02-28 | Fuji Photo Film Co Ltd | ポジ型レジスト組成物 |
JP2003241384A (ja) * | 2002-02-22 | 2003-08-27 | Jsr Corp | 感放射線性樹脂組成物 |
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Publication number | Priority date | Publication date | Assignee | Title |
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WO1999049504A1 (fr) * | 1998-03-26 | 1999-09-30 | Nikon Corporation | Procede et systeme d'exposition par projection |
JP2000338681A (ja) * | 1999-05-31 | 2000-12-08 | 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 |
JP2001022070A (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 |
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 |
JP2001042534A (ja) * | 1999-07-26 | 2001-02-16 | 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 |
JP2001142212A (ja) * | 1999-11-11 | 2001-05-25 | Fuji Photo Film Co Ltd | ポジ型フォトレジスト組成物 |
JP2002357905A (ja) * | 2001-03-28 | 2002-12-13 | Sumitomo Chem Co Ltd | レジスト組成物 |
JP2003057825A (ja) * | 2001-08-16 | 2003-02-28 | Fuji Photo Film Co Ltd | ポジ型レジスト組成物 |
JP2003241384A (ja) * | 2002-02-22 | 2003-08-27 | Jsr Corp | 感放射線性樹脂組成物 |
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