WO2004077158A1 - ホトレジスト組成物およびレジストパターンの形成方法 - Google Patents
ホトレジスト組成物およびレジストパターンの形成方法 Download PDFInfo
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- WO2004077158A1 WO2004077158A1 PCT/JP2004/002179 JP2004002179W WO2004077158A1 WO 2004077158 A1 WO2004077158 A1 WO 2004077158A1 JP 2004002179 W JP2004002179 W JP 2004002179W WO 2004077158 A1 WO2004077158 A1 WO 2004077158A1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- 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
-
- 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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
Definitions
- the present invention relates to a photoresist pattern used in a resist pattern method including an immersion lithography (immersion exposure) process, and a method of forming a resist pattern using a photoresist pattern. .
- the lithography method is often used for the manufacture of ffits for various electronic devices such as roller devices and liquid crystal devices.However, as the device structure becomes more and more compact, resist patterns in the lithography process must be reduced. Has been requested.
- the ability to form a fine resist pattern with a line width of about 90 nm in the most advanced areas, for example, using the lithography method, requires further finer pattern formation in the future. Is done.
- Non-Patent Document 1 Non-Patent Document 2, and Non-Patent Document 3
- a solvent such as a fluorine-based inert liquid.
- a chemically amplified positive resist is used as a diffusion control agent for an acid generated from an acid generator, and is capable of combining a conjugated product. It is done.
- Non-patent Document 1 Journal of Vacuum Science Technology (Journa 1 of Vacuum Science & Technology B) (USA), 1999, Vol. 17, No. 6, 3306-3309.
- Non-Patent Document 2 Journal of Vacuum Science Technology (Technology & Technology) (US), 20 ⁇ ⁇ , Vol. 19, No. 6, 2353—2356 pages.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-333715
- the applicant tried to apply a resist composition containing a tertiary lower amine such as a low-molecular-weight alkanolamine among conventional raw compounds to an image-forming lithography method. Recognizing the problem that the pattern shape and line edge roughness (hereinafter sometimes referred to as LER) force is not S + ⁇ , the present inventors have arrived at the present invention to solve this problem.
- LER line edge roughness
- the present invention has been made in view of the problems of power and skill, and It is hardly affected by the solvent used in the immersion lithography process without impairing the solution and the depth of focus, which are the best features of lithography.
- the first male (aspect) of the present invention is a photoresist composition used in a resist pattern forming method including a step of immersing light
- X, ⁇ , and ⁇ are each independently an alkyl group to which an aryl group may be bonded at 53 ⁇ 4 (the two of the X, ⁇ , and ⁇ are bonded to form a cyclic it And at least one of X, Y, and ⁇ includes the following formula, and the compound (D) has a preferable amount.
- a second aspect (aspect) of the present invention is a resist pattern forming method using the photoresist composition of the first aspect (aspect), wherein the resist pattern includes a step of immersion exposure. This is the method of construction.
- (meth) atalinoleic acid means one or both of methacryloleic acid and acrylic acid.
- (Meth) acrylate refers to one or both of methacrylate and acrylate.
- Structure unit refers to a monomer unit constituting a polymer.
- Raton units are groups obtained by removing one hydrogen atom from a tactical or polycyclic rataton. The lithography process usually involves the following steps: resist coating, pre-beta, selective exposure, post-exposure heating, and alkali development. Including the process. The invention's effect
- the resist pattern there is no 3 ⁇ 4tX on the surface of the resist pattern in the immersion lithography process such that the resist pattern has a T-shaped shape, a low line edge roughness, and a highly accurate resist excellent in a resist pattern profino shape. You can get a pattern. Therefore, by using the photoresist fine particles of the present invention, a resist pattern including an immersion lithography step can be effectively formed.
- the Hotlegis M extinction of the present invention contains the component (D).
- the nitrogen-containing arsenic compound has been conventionally compounded in a photoresist material as a diffusion control agent of an acid in order to improve the resist pattern shape, the stability of the bow I with time, and the like.
- a specific nitrogen-containing compound by selecting a specific nitrogen-containing compound and blending it into a photoresist and a destructive substance, it is possible to solve the problem i of the present invention, and to obtain a glue suitable for image lithography. .
- the component (D) is represented by the general formula (1).
- the component (D) is less likely to volatilize after prebaking and remains in the resist film. It is easy to perform, and it remains in the resist film even after immersion exposure, has no surface, etc. used in immersion lithography, has low line edge roughness, and has excellent resist pattern profile. Is obtained.
- the molecular weight of the component (D) is preferably at least 200, more preferably at least 250, and even more preferably at least 300, because of excellent resolution.
- the upper limit of the molecular weight is not limited as long as it has the above-mentioned effects, but is preferably 600 or less.
- the solubility in the resist solvent may be reduced.
- the component (D) is pre-pressed as compared to an unsubstituted alkyl group or aryl group. It has a characteristic that it is difficult to volatilize after the masking and remains in the resist film (resist layer). Specifically, it is an ether group, an estenol group, a hydroxyl group, a force / reponinol group, Examples include a carboxyl group, a cyano group, and a rataton ring.
- ether groups and ester groups are preferable from the viewpoint of effects.
- the alkyl group ⁇ , ⁇ , or ⁇ in any position. That is, it may be present in the alkyl group, or may be present in the alkyl group. Also, two or more different polar groups or the same polar group may cover different positions. In the case where the value is extremely different, the alkyl group is an alkylene group, and one or more of the above-mentioned 3
- the anolexylene group X, ⁇ , ⁇ also encompasses the anolexylene group of the formula: ⁇ .
- At least one polar group is present in each of the alkyl groups X, ⁇ , and ⁇ .
- the number of poles' 14S is not particularly limited, but the total number of ⁇ , ⁇ , and ⁇ is 10 or less.
- the alkyl groups ⁇ , ⁇ , and ⁇ may be any of a3 ⁇ 4i, a branched chain, and a cyclic form.
- two terminals of the alkyl groups X, Y, and ⁇ may combine to form a cyclic structure.
- the alkyl groups X, ⁇ , and ⁇ ⁇ ⁇ also include an anoalkylene group represented by the formula: ⁇ .
- the alkyl groups ⁇ , ⁇ , and ⁇ may have an aryl group bonded thereto, and the aryl group may be a substituted or fiber-substituted phenyl group or a naphthyl wister.
- the fiber be a fiber without a aryl group, be branched, or be annular.
- the number of carbon atoms in the alkyl groups X, Y, and ⁇ except for extreme cases is, for example, from:! To 20, preferably from 3 to 10, respectively.
- the number of carbon atoms of the phenol group ⁇ , ⁇ , and ⁇ may be the same or different, but are preferably the same because of the strength of the s-effect and the like.
- the alkyl groups X, ⁇ , and ⁇ may have the same fft or different structures, but it is preferable that two or more have the same age from the viewpoint of the stability of the effect and the like. Most preferably, the three are the same keystone.
- the component (D) specifically includes the following chemical formula S.
- Preferred examples of the component (D) include the following compounds.
- the most preferred component (D) is represented by the following general formula (2) c [Formula 6]
- R ", R 12 are, respectively;! ⁇ Insect standing to ⁇ Keio alkylene group, R 13 represents a ⁇ alkyl group.
- R x ⁇ R 12 and R 13 may be branched, branched or cyclic, but are preferably am or branched.
- R ", the number of carbon atoms of R 12, R 13 are, from the perspective of molecular weight control, respectively 1-5, preferably:!. ⁇ A 3 number of carbon atoms in R 11 R 12, R 13 may be the same In R 1 R 12 : may be the same or different.
- Examples of the compound represented by the general formula (2) include tris- (2-methoxymethoxyethyl) amine, tris-2- (2-methoxy (ethoxy)) ethylamine, and the like. Among them, tris-2- (2-methoxy (ethoxy)) ethylamine is preferred.
- Compounds other than the general formula (2) include tris- (2- (2-methoxyethoxy) methoxyethyl) amine.
- the component (D) can be used alone or in combination of two or more.
- component (D) component the component (A) 100 parts by weight, 0.01 to 2.0 mass 0 I preferably used in the range of 0.03 to 1.0 wt%.
- the content is 0.01% by mass or more, the effect S of the composition can be obtained, and when the content is 2.0% by mass or less, deterioration of sensitivity can be prevented.
- the component (D) is uniformly distributed in the resist layer when heated in a plate beta performed to form the resist layer. Is inserted.
- the component (D) is not biased near the surface of the resist layer that is harmful to the solvent; it is also possible to suppress the adverse effects such as the entry of the solvent into the solvent. Is done.
- the acid generated from the component (B) during post-exposure baking (PEB) can be effectively suppressed, It is repelled that it contributes to improvement of resolution, improvement of resist pattern profile, and the like.
- the present inventor has found the following criteria to determine whether it is a resist thread which is suitable for the immersion process.
- a resist pirates used in a resist pattern forming method including a step of immersion exposure, wherein a line and space of 130 ⁇ m is obtained by a lithography process of a normal exposure using a light source having a wavelength of 193 nm.
- the sensitivity when a 1: 1 resist pattern is formed is XI, and itt is the same as that in the conventional lithography process using a 193 nm light source.
- the sensitivity when a resist pattern with a line-and-space ratio of 1 to 1 nm was set to 1: 1 by a simulated immersion lithography process, in which the solvent of the immersion exposure described above was added to the resist film, was added.
- X 2 [(X 2 / X 1) — 1]
- the value of X 100 is 8.0 or less.
- the resist pattern is unsuitable as a resist material for the immersion exposure process, and the resist pattern becomes T-topped or the resist pattern collapses.
- the lithography process of the normal exposure using the light source of the wavelength of 193 nm refers to the exposure of the 193 nm wavelength ArF
- the normal lithography process that is, resist coating, pre-bake, and selection are performed on the silicon wafer and other parts by the normal exposure that exposes the lens and the resist layer on the wafer with an inert gas such as air or nitrogen.
- a post-baking step after the alkali development may be included, or an organic or anti-fiber anti-fiber film may be provided between the plate and the coating layer of the resist curd.
- the sensitivity X 1 when a resist pattern (hereinafter referred to as “13 O nm L & Sj”) in which the line and space of 13 O nm becomes 1 to 1 by the lithography process of the normal exposure is formed.
- 13 O nm L & Sj a resist pattern in which the line and space of 13 O nm becomes 1 to 1 by the lithography process of the normal exposure
- the conditions at that time may be the same as those that have been performed practically.
- 130 nm L & S force is obvious within the range where S can be formed.
- a silicon wafer with a diameter of 8 inches is used as a countermeasure, and the number of times is 1000 4000 rpm key, more specifically, about 2000 rpm, and the pre-beta has a temperature of [140] Range, more specifically, 115 ° C and 90 seconds, so that a [resist] film thickness of 80 250 nm, more specifically 200, and a 6 inch diameter resist coating film [] Is formed concentrically.
- the simulated immersion lithography process refers to the normal exposure lithography process using the 193 nm ArF excimer laser as described above,
- PEB means a step of adding a step of bringing a solvent for immersion exposure into contact with a resist film. Specifically, the process involves contacting the resist film with a solvent for resist coating, pre-beta, selective exposure, and immersion exposure, followed by exposure to heat and alkaline development. Depending on the case, a post-beta step may be included after the development.
- the resist film after selective exposure provided on the warehouse is durable even if it is immersed in the solvent for immersion exposure or sprayed like a shuffle.
- the force is preferably 23 ° C.
- the reverse rotation is preferably 300 3000 rpm, preferably 500 2500 rpm.
- Tk is dropped to the center of tg with the rinsing nozzle, and during that time, after exposure, the resist film-coated anode is rotated; ⁇ : 500 rpm; Sat: pure water; Bottom volume: 1.0 L / min; Commerce time: 2 minutes; Conversion between solvent and resist: 23 ° C 0 And such simulated immersion
- the sensitivity X 2 when a 13 O nm L & S resist pattern is formed by the lithography process is the exposure amount at which 130 nm L & S is formed in the same manner as X 1 above. Is commonly used.
- the conditions at that time are also the same as XI. That is, the conditions for obtaining X2 are the same as the conditions for obtaining X1 except for the step of inverting the solvent of the immersion exposure to the resist film.
- the component (A) is a resin component whose alkali solubility changes under the action of an acid.
- the component (A), 1 @ X is usually used as a base resin for a chemically amplified resist.
- the former is a so-called negative resist composition, and the latter is a so-called positive resist composition.
- the resist composition of the present invention is preferably of a positive type.
- a crosslinking agent S is blended together with an acid generator component. Then, when an acid is generated from the (B) acid generator component by exposure to light during the formation of the resist pattern, the acid acts to cause cross-linking between the alkali-soluble (A) resin component and the cross-linking agent, resulting in alkali insolubility.
- an amino crosslinking agent such as melamine, urea, or glycoluril having a methylol group or an alkoxymethyl group is used.
- the resin component is an alkali-insoluble resin having a so-called ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- the component ( ⁇ ) includes any of po,, and negative types, (a O) (a 0-1) dicanolevonic acid anhydride-containing shelf unit and (a 0-2) phenol (including 4 ⁇ fiber). It is important to have no shining units (hereinafter referred to as (a0) or (aO) units).
- the (aO-1) dicarboxylic acid »-containing structural unit is a structural unit having a —C (O) —O—C (O) —structure.
- Such include, for example, tactical or polycyclic rings
- Specific examples include structural units containing hydrates, and more specifically, units derived from a substituted or polycyclic maleic anhydride represented by the following [Chemical formula 7] and itaconic acid represented by the following [Chemical formula 8] Induced units and the like can be mentioned.
- the (a 0-2) phenol (IfeR) -containing structural unit includes a benzene ring and a naphthalene ring.
- a structural unit containing a group attached to one water rooster IS. Examples of such a unit include a hydroxystyrene unit and a (ct-methyl) hydroxystyrene 'unit. Since the component (A) does not contain (a0), that is, (a0-1) and (a0-2), it is hardly affected by the solvent even in the immersion lithography (immersion lithography) process, and the sensitivity is high. This improves the effect of forming a resist pattern having an excellent H # shape.
- the component (A) may be any of a po-, a-, and a negative-type: ⁇ It is preferable that the component (A) contains a structural unit derived from a (meth) acrylate ester.
- the component (A) is a component suitable for use in exposure with an ArF excimer laser and improving the characteristics such as resolution. 80 mol% or more, preferably 90 mol% or more (100 mol% power is most preferable! / ⁇ ).
- the structural unit derived from the (meth) acrylic ester contained in the component (A) The structural unit derived from methacrylic acid ester and the structural unit derived from atalylic acid ester coexist together. Power S, etching surface, low line edge roughness, excellent resolution, excellent depth of focus This is preferable in that a wide photoresist composition can be obtained.
- the surface ⁇ L at the time of etching here is different from the surface roughness of the resist pattern (deterioration of the resist pattern profino shape) due to the influence of the Nada described above and the conventional dry etching resistance.
- Line edge roughness occurs in a resist pattern after development.
- the line edge roughness appears as a distortion around a hole in a horn resist pattern, and appears as uneven unevenness on a side surface in a line and space pattern.
- the diffeat is, for example, KL ⁇ Tencor's surface defect observation device (trade name “KL
- AJ) is a scum or defect in the resist pattern detected when observed from directly above the developed resist pattern.
- the component (A) contains a structural unit derived from a methacrylic acid ester and a structural unit derived from an atalylic acid ester, the form is not particularly limited as long as it is! /.
- the component (A) contains a copolymer (A 1): a copolymer containing a structural unit derived from a methacrylate ester and a structural unit derived from an acrylate ester
- a 2 a mixed resin of a polymer containing at least a structural unit derived from a methacrylate ester and a polymer containing at least a structural unit derived from an acrylate ester It may be something.
- These mixed resins (A 2) One or both of the polymers may be equivalent to the tiflB copolymer (A1).
- the mixed resin ( ⁇ 2) is preferred.
- the constituent unit derived from methacrylate and the constituent unit derived from acrylate in the component (ii) are the constituent unit derived from methacrylate and the constituent unit derived from acrylate. against total number of moles of, Metakuriru acid 10-85 Monore a structural unit ester or al derived 0 I preferably 20-80 mole 0/0, 15 a structural unit derived from Atariru acid ester ether 90 mol 0'm preferably preferably used so as to be 20 to 80 mol%.
- component (ii) preferably comprises (a 1) a structural unit derived from a (meth) acrylate ester having a Satsuru dissolution inhibiting group.
- the component (A) is used to satisfy resolution, dry etching resistance, and fine pattern shape.
- a monomer unit having a plurality of different functions other than the unit for example, preferably composed of a combination of at least one of the following structural units.
- a structural unit derived from a (meth) acrylate ester having a rataton unit hereinafter, referred to as (a 2) or (a 2) unit
- Arukono HfcK having an acid group-containing polycyclic ⁇ 3 ⁇ 4 (meth) configuration unit derived from an acrylate ester (hereinafter, (a 3) or (a 3) of the unit.)
- the component (A) contains (a1) and (a2), so that the male used in the immersion lithography process has a higher metaphysical resolution, and has a higher resolution and ⁇ The resist pattern shape becomes good.
- these two types of constituent units are 40 moles of the component (A). /. Or more, more preferably 60 mol. A force that prefers to occupy more than / 0 LV,
- the (a1) unit is a structural unit derived from a (meth) acrylate ester having a neutral dissolution inhibiting group.
- the non-soluble dissolution inhibiting group in (a1) has the alkali dissolution inhibiting property before the exposure, which makes the entire component (A) alkali-insoluble. Is particularly limited as long as the entire component (A) can be converted to alkali-soluble. "It can be used for 3 ⁇ 4rf.” ⁇ From the viewpoint of the carboxyl group of (meth) acrylic acid, Groups that form cyclic or chain tertiary alkyl esters, tertiary alkoxycarbonyl groups, or chain alkoxyalkyl groups are widely known.
- a ⁇ ⁇ I biolysis inhibiting group containing a lunar female polycyclic ring can be suitably used.
- the polycyclic ring ⁇ S may be replaced by a fluorine atom or a fluorinated alkyl group, or may be a dicycloalkane, a tricycloalkane, a teracycloanole, etc. And the like from which the hydrogen element is removed.
- Specific examples include groups in which one hydrogen atom has been removed from a polycycloalkyl alkane such as adamantane, norbornane, isobornane, tricyclodecane, and tetracyclododecane.
- Such a polycyclic ring can be used by selecting from a variety of proposed ones in an ArF resist. Of these, an adamantyl group, a norbornyl group, and a tetracyclododecanyl group are industrially preferable.
- R is a hydrogen atom or a methyl group, and R 1 is an alkyl group.
- R is a hydrogen atom or a methyl group, and R 2 and R 3 are each independently a lower alkyl group.
- R is a hydrogen atom or a methyl group
- R 4 is a tertiary alkyl group.
- R is a 7k element atom or a methyl group.
- R is a hydrogen atom or a methyl group, and R 5 is a methyl group.
- R is a hydrogen atom or a methyl group
- R 6 is a low alkyl group.
- R is a hydrogen atom or a methyl group.
- R is a hydrogen atom or a methyl group.
- R is a hydrogen atom or a methyl group, and R 7 is a low alkyl group.
- ⁇ ⁇ And R 6 -R 7 are low alkyl groups with 1-5 carbon atoms, respectively, branched alkyl Preferred are groups such as methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl, isopentyl, and neopentyl. Industrially, a methyl group or an ethyl group is preferred.
- R 4 is a tertiary alkyl group such as a tert-butyl group or a tert-amyl group, and is a tert-butyl group, which is industrially preferable.
- the structural units represented by the general formulas (1), (11), and (III) among the above-mentioned units are particularly used in one step of image lithography. It is excellent in solvent resistance and excellent in high resolution.
- the unit Since the unit has rataton units, it is effective for enhancing the adhesion to the resist film and enhancing the »property with the developing solution, and is suitable for one step of immersion lithography. It has excellent resistance to dissolution due to the type of water used.
- the unit (a2) in the present invention may be a unit having a lactone unit and copolymerizable with other constituent units of the component (A).
- examples of the rataton unit of the formula (1) include a group obtained by removing one hydrogen atom from y-petit mouth lactone.
- a polycyclic rataton unit one hydrogen atom is removed from rataton-containing polycycloanole! /, And groups.
- the number of rataton units is counted, and the reduction including -o-c (o) -structure is counted as the first ring. Therefore, here the environment is
- the monomer units as (a 2) are represented by the following general formulas [Chemical Formula 18] to [Chemical Formula 20].
- R is a hydrogen atom or a methyl group
- R is a hydrogen atom or a methyl group
- R is a hydrogen atom or a methyl group
- ⁇ -butyrolataton ester of (meth) acrylic acid having an ester bond at the ⁇ -carbon as shown in [Chemical Formula 20], or a compound such as [Chemical Formula 18] or [Chemical Formula 19] Norbornane ratatone ester is particularly preferred for industrial use.
- the (a 3) unit is a structural unit derived from a (meth) acrylate having an alcohol I'feR'-containing polycyclic ring.
- the hydroxyl group in the polycyclic alcohol containing the 7j acid group is a polar group
- the use of the hydroxyl group improves the 7k property of the entire component (A) with the developing solution and improves the alkali solubility in the exposed area.
- it has excellent solubility in a very specific process used in one step of image lithography. Therefore, when the component (A) has (a3), the resolution is improved.
- the polycyclic ring in (a3) any one of the same polycyclic groups as those exemplified in the description of i (a1) can be suitably used.
- the alcoholic acid group-containing polycyclic ring in (a3) is not particularly limited, for example, a hydroxyl group-containing adamantyl group and the like are preferably used.
- the water-containing adamantyl group be represented by the following general formula (IV), because it has an effect of increasing dry etching resistance and enhancing perpendicularity of the cross-sectional shape of the non-woven fabric.
- n is an integer from :! to 3
- the unit is an alcohol as described above, which has polycyclic S containing feK and (A) copolymerizable with other constituent units of the component.
- R is a hydrogen atom or a methyl group.
- the polycycle is "different from any of the anaerobic dissolution inhibiting group, the anaerobic lactone unit, and the hydrocyanic alcohol-containing polycyclic ⁇ ".
- the (a 4) unit polycycle is any one of (al) units of a magnetically cleavable dissolution inhibiting group, (a 2) units of rataton units, and (a 3) units of Alcohol MfeK Fiber containing polycycle (A4), (a) constituents of the (A) unit, a dissociative dissolution inhibiting group of (a) units, (a2) units of lactone units, and (a 3) It means that none of the units contains the alcohol-ffek-containing polycycle.
- the polycycle in the unit (a 4) is selected in the same way as the constituent unit used as the unit ffjlB (a 1) to (a 3) in one component (A). It is not particularly limited.
- the polycyclic ring (S in the (a 4) unit an aliphatic polycyclic ring similar to that exemplified as the Sukki (a 1) unit can be used, and is conventionally known as an ArF positive resist material. A large number of powers are available.
- At least one selected from the group consisting of a tricyclodecanyl group, an adamantyl group and a tetracyclododekael group is preferred in view of industrial handling.
- the unit is a unit having a polycyclic structure as described above and copolymerizable with other constituent units of the component (A).
- R is a hydrogen atom or a methyl group
- R is a hydrogen atom or a methyl group
- the component (A) has a value of (a 1 )
- the resolution is excellent and it is preferable.
- the content of the (a2) unit is from 20 to 60 mol 0, preferably from 30 to 50 mol%, based on the total of the constituent units constituting the component (A), Excellent at 14 and preferred.
- the resin component of the F 2 excimer laser resist can be suitably used as long as it contains the (al) unit and does not have the (a 0) unit.
- a resin component for F 2 resist a copolymer containing a unit having a group having, for example, (meth) Akuriru ester fluorine atom Furuoroarukiru group in the side chain of the unit.
- the weight average amount (polystyrene: / ⁇ , the same applies hereinafter) of the shelf component (A) in the present invention is not particularly limited, but it is preferably 500 to 300, more preferably 800. 0 to 20000. If it is larger than this range, the solubility in the resist solvent will be poor, and if it is smaller, the dry etching resistance and the cross-sectional shape of the resist pattern may be deteriorated.
- the resin component (A) in the present invention comprises a monomer corresponding to (a 1) and, if necessary, each structural unit of (a 2), (a 3) and Z or (a 4). Zobisisobutyronitrile
- any one of ⁇ q can be suitably selected from those having ⁇ q as the acid generation U in the amplifying resist.
- oxidized salts in which the fluorinated alkylsulfonic acid is replaced with an aniline.
- preferred acid generators include dipheninoleum dimethyl trifluoromethanes olefonate, (4-methoxyphenyle) phenylidenium trifluoromethanes ore Tris, bis (p-tert-butylinolephene) methanesulfonate, trifluoromethylsulfonate, triphenylenolenesolefonium trifluorosulfonate, (4-methoxypheninole) diphenyl / Lefonium trifluoromethanesulfonate, (4-methylphenyl) diphenyls norefonynaphnophorenobutanosulfone, (p-tert-butylphenyl) diphenyl sulphonium trifluoromethanesulfonate, diphenyl ⁇ ⁇
- one kind of acid generator may be used in a bug, or two or more kinds may be used in combination.
- the shelf amount of the component (B) is 0.5 to 30 parts by mass, preferably 1 to 10 parts by mass, based on 100 parts by mass of the component (A). If the amount is less than 0.5 part by mass, the pattern formation force is not performed for H ′′. If the amount is more than 30 parts by mass, it is difficult to obtain a uniform intense night, which may cause deterioration in storage stability.
- One organic (C) is 0.5 to 30 parts by mass, preferably 1 to 10 parts by mass, based on 100 parts by mass of the component (A). If the amount is less than 0.5 part by mass, the pattern formation force is not performed for H ′′. If the amount is more than 30 parts by mass, it is difficult to obtain a uniform intense night, which may cause deterioration in storage stability.
- the photoresist exfoliated matter according to the present invention comprises a component (A), a component (B), and an optional component (D) and a component Z or (E) described below. It can be produced by dissolving in (C).
- the transliteration lj (C) may be any as long as it is capable of dissolving the Shukomi (A) component and the Oki (B) component to form a uniform nada.
- 1S can be used by selecting any two or more of _h ⁇ 131 from among
- ketones such as ⁇ -petit mouth ratatone, acetone, methyl ethyl ketone, cyclohexanone, methyl isoamyl ketone, 2-heptanone, ethylene glycol, ethylene glycol monoethylene acetate Diethylene glycol monoacetate, diethylene glycol monoacetate, propylene glycol, propylene glycol monoacetate, zipper pyrendalicole, or dipropylene daricol monoacetate monomethinoleate monoe Alcohols such as propynoleate / monobutyl ether or monophenylene ether, and their derivatives, cyclic ethers such as dioxane, methyl lactate, ethyl lactate, methinolate, ethyl ethyl acetate, butyl acetate, Pinore Phosphate Mechinore, Echiru pyruvate, methyl methoxypropionate, etc.
- ketones such as ⁇ -petit mouth
- propylene glycol monomethyl ether acetate (PGMEA) and propylene glycol monomethyl ether (PGME), ethyl lactate (EL), and polar wisteria IJ having a hydroxyl group ⁇ lactone such as ⁇ -petit mouth ratatone Mixed conversion is preferred because it improves the storage stability of photoresist thread debris.
- P GME II: EL is 6: 4 to 4: 6.
- the mass ratio of PGEA: PGME is preferably from 8: 2 to 2: 8, more preferably from 8: 2 to 5: 5.
- the content of the organic solvent (C) in the photo-resist curable composition according to the present invention is such that the solid content of the resist curable substance is 3 to 30 mass. In the range of / 0 , resist ⁇ ? Suitable for: IIS defined.
- the photoresist exfoliated product according to the present invention may further contain a nitrogen-containing compound other than the component (D).
- an organic carboxylic acid or oxo or a derivative of phosphorus can be contained.
- the component (D) and the component (E) can be used in combination, or one of them can be used.
- organic carboxylic acid examples include mosquito such as malonic acid, citric acid, apple, succinic acid, benzoic acid, and salicylic acid.
- Phosphorus oxo acids or derivatives thereof include phosphoric acid, derivatives such as phosphoric acid or their esters such as di-n-ptinoleestenophosphate, diphenyl phosphate, phosphonic acid, dimethyl phosphonate, Phosphonic acids such as phosphonic acid-di-n-butyl ester, phenylphosphonic acid, diphenylphosphonate, dibenzylphosphonic acid ester and derivatives such as esters thereof, phosphines such as phosphinic acid and phenylphosphinic acid And derivatives such as esters thereof. Of these, phosphonic acid is particularly preferred.
- the component (E) is used in an amount of 0.01 to 5.0 parts by mass per 100 parts by mass of the component (A).
- the photoresist exfoliated matter according to the present invention may further contain a miscible filler, if necessary, for example, an additional resin for improving the performance of the resist film, a surface activity for improving the coatability
- Inhibitors, vulgar IJs, anions, coloring agents, antihalation agents, etc. can be included as appropriate.
- the production of the photoresist exfoliated matter of the present invention can be carried out, for example, only by mixing and stirring the following components in a usual manner, and using a disperser such as a dissolver, a homogenizer, or a three-roller mill if necessary. Also, after mixing, use a mesh, a membrane filter, etc., and filter.
- a photoresist composition according to the present invention is applied to a substrate such as silicon wafer by a spinner or the like, and then pre-beta (PAB treatment) is performed.
- PAB treatment pre-beta
- a two-layer laminate having an organic or road-based anti-wetting film between the sickle and the coating layer of the resist and the dead substance can also be used. It is also possible to use a two-layer structure in which an organic anti-reflection film is provided on the coating layer of the resist yarn, and a three-layer structure in which a lower anti-reflection film is further provided. You can also.
- the steps so far can be performed using a known method.
- the operating conditions are as follows. Les, Mashi can force a child to apply 1 3 ⁇ 4 constant depending on the Ya especially I 1 student ⁇ .
- the resist layer which is a layer of the photoresist yarn obtained above, is subjected to iodine exposure (Liquidl marshal Lithograpy) through a desired mask pattern.
- iodine exposure Liquidl marshal Lithograpy
- the space between the resist layer and the lens at the lowermost position of the exposure is filled with a solvent having a refractive index larger than the refractive index of air and a solvent having a refractive index larger than the refractive index of air.
- the ability to perform exposure in a state filled with a sea with a refractive index smaller than the refractive index of the resist layer is preferred.
- Wavelength used for the exposure is not particularly limited, A rF excimer laser, KrF excimer laser one, F 2 excimer laser, EUV (extreme ultraviolet), VUV (3 ⁇ 4 empty ultraviolet), electron beams, X-rays, and soft X-ray This can be done using the thigh line.
- the photoresist fibers according to the present invention are as follows: Ar F excimer laser:
- the space between the resist layer and the lowermost lens of the exposure apparatus is filled with a solvent having a refractive index larger than the refractive index of air. Force S preferred.
- Examples of the solvent having a refractive index higher than the refractive index of air include water and a fluorine-based inert liquid.
- Specific examples of the fluorinated inert liquid include fluorinated compounds such as C 3 HC 12 F 5 , C 4 F 9 OCH 3 , C 4 F 9 OC 2 H 5 , and C 5 H 3 F 7. Liquid.
- the photoresist fiber of the present invention is not particularly susceptible to the adverse effects of water, has low line edge roughness, and has an excellent resist pattern shape. In addition, water is preferred because of its cost, nature and sensitivity.
- the refractive index of the solvent having a refractive index larger than that of air is not particularly limited as long as it is within this range.
- PEB exposure impregnation heat
- development processing is performed using an alkaline developing solution of anorekari '! 4_ ⁇ ?
- water rinsing is preferably performed using the yarn ⁇ . Rinsing is performed, for example, by dripping or rinsing water on the surface while rotating, and washing away the resist composition dissolved by the developing solution and the image solution above. Then, by drying, the pattern of the photoresist residue is reduced to a pattern corresponding to the mask pattern.
- a fine resist pattern having a narrow line width, particularly a line and space (L & S) pattern having a small pitch can be manufactured in a good resist pattern profile with a good resolution. be able to.
- the pitch in the line and space pattern refers to the sum of the resist pattern width and the space width in the line width direction of the pattern.
- Substrate 8 inch silicon
- Resist coating method Spinning on a substrate rotating at 2000 rpm using a spinner; Size of resist coating film: Above: Concentrically 6 inches in diameter, 200 nm thick on S3 ⁇ 4K; Pre-bake conditions: 115 ° C, 90 Seconds;
- Exposure decorated cow 115. C, 90 seconds
- Photoresist thread 1 The following components (A), (B) and (D) were uniformly dissolved in component (C) to prepare Photoresist thread 1.
- component (A) 100 parts by mass of a methacrylic acid ester / acrylic acid ester copolymer composed of the three structural units shown in [Chemical Formula 26] was used.
- the copolymer has a dicarboxylic acid anhydride-containing new unit and a phenol-containing unit.
- the prepared component ( ⁇ ) had a weight average molecular weight of 1,000.
- component (B) 3.5 parts by mass of triphenylsulfon-dumnonafluorobutanesulfonate and 1.0 part by mass of methanesulfonate at the (4-methylphenyl) diphenylsulfoniumtriphnoleo mouth are used.
- component (C) a mixed IJ of 1900 parts by mass of Nada (a mass ratio of 6: 4) of propylene daric corn monomethinooleate enorea acetate and lactate / re was used.
- component (D) 0.65 parts by mass of tris-2- (2-methoxy (ethoxy)) ethylamine was used.
- a resist pattern was formed using the resist thread 1 obtained above.
- ⁇ system Sl stop! ⁇ Apply the product “AR_19” (trade name, Ship 1 ey
- the photoresist thread debris 1 obtained above is applied to the fiber-preventing BEh using a spinner, and pre-betaed on a hot plate at 11'5 ° C for 90 seconds to make it difficult.
- a resist layer having a thickness of 140 nm was formed on the protective film.
- the substrate was subjected to PEB treatment under the conditions of 115 ° C. and 90 seconds, and further developed at 23 ° C. with a developer for 60 minutes.
- a developer for 60 minutes As the alkaline developer, a 2.38% by mass aqueous solution of tetramethylammonium hydroxide was used.
- Example 1 Example 1 was repeated except that the component (D) was changed to 0.3 parts by mass of triethanolamine.
- Example 1 the same operation was performed except that the prism and the resist layer were directly removed without using water.
- Example 1 in Comparative Example 3, the component (D) was changed to 0.7% by mass of tri-n-octylamine (Mw 353), and in Comparative Example 4, triphenylamine (Mw 245) was used. Change to 0.49 parts by mass. In Comparative Example 6, change to triethylamine (Mw 101). Change to 0.2 parts by mass. In Comparative Example 5, change to triisopropanolamine (Mw 91). Except for changing the parts by mass, similar resist extincts were prepared, and the resist pattern was formed in the same manner except that the normal exposure was used instead of the immersion exposure. The resist pattern was poor and the resolution was poor compared to ⁇ .
- the LER is J-length SEM, product name “S_9220” (day; 3 ⁇ 4Sakusho Nei3 ⁇ 4), the width of the resist pattern of the sample is measured at 32 locations, and the result is three times the standard deviation ( ⁇ ) (3 ⁇ ) The smaller the value of 3 ⁇ , the lower the roughness and the more uniform the width of the resist pattern.
- the resist composition of the present invention when applied to immersion lithography, it is possible to obtain a very good resist pattern profino shape as compared with the age using other nitrogen-containing arsenide ⁇ ! In addition, it was clarified that sufficient resolution was possible up to an experiment of a line width of 50 nm and a pitch of 100 nm, for example.
- Example 1 the (A) component of p, q, the molar ratio of r 4 0/4 0/2 0 (mol 0/0),
- component (B) 5 parts by mass of trifenylsulfonimnonafnorolobutane sulfonate was used, and as the component (D), mm (N-1) shown in Chemical Formula 5 (N-1) (Example 2) (N- 2) (Example 3) shown in disgust [Chem. 5], (N-3) (Example 4) shown in mm [Chem. 5], and (N- 2) shown in fufB [Chem. 5].
- component (D) 5 parts by mass of trifenylsulfonimnonafnorolobutane sulfonate was used, and as the component (D), mm (N-1) shown in Chemical Formula 5 (N-1) (Example 2) (N- 2) (Example 3) shown in disgust [Chem. 5], (N-3) (Example 4) shown in mm [Chem. 5], and (N- 2) shown in fufB [Chem. 5].
- (N-1), (N-2), (N-3), and (N-4) are 58 parts by mass and 0.78 parts by mass, respectively, based on 100 parts by mass of component (A). Parts, 0.55 parts by mass, and 0.69 parts by mass so that the triethanolamine of Comparative Example 1 had the same number of monoles.
- the simulated immersion lithography process was performed on each of the resist objects as described below to determine whether the resist object was suitable for immersion lithography.
- an organic prevention substance “AR-19” (trade name, Ship 1 ey
- AR-19 trade name, Ship 1 ey
- the film was developed with a developing solution at 3 ° C for 60 seconds.
- a developing solution As a developer, 2.38% by mass of tetramethinoleammonium hydroxide in water was used.
- the resist pattern was not ⁇ -top shape, and no surface ra was observed.
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Description
Claims
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EP04714426A EP1598701A4 (en) | 2003-02-25 | 2004-02-25 | PHOTOSENSITIVE RESIN COMPOSITION AND METHOD FOR FORMING RESIN PATTERN |
JP2005502898A JPWO2004077158A1 (ja) | 2003-02-25 | 2004-02-25 | ホトレジスト組成物およびレジストパターンの形成方法 |
US10/546,573 US20060154171A1 (en) | 2003-02-25 | 2004-02-25 | Photoresist composition and method of forming resist pattern |
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- 2004-02-25 US US10/546,573 patent/US20060154171A1/en not_active Abandoned
- 2004-02-25 JP JP2005502898A patent/JPWO2004077158A1/ja active Pending
- 2004-02-25 EP EP04714426A patent/EP1598701A4/en not_active Withdrawn
- 2004-02-25 TW TW093104815A patent/TWI308993B/zh not_active IP Right Cessation
- 2004-02-25 WO PCT/JP2004/002179 patent/WO2004077158A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
JPWO2004077158A1 (ja) | 2006-06-08 |
TW200426511A (en) | 2004-12-01 |
TWI308993B (en) | 2009-04-21 |
KR20050098957A (ko) | 2005-10-12 |
EP1598701A1 (en) | 2005-11-23 |
US20060154171A1 (en) | 2006-07-13 |
EP1598701A4 (en) | 2009-12-09 |
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