CN115873175B - Bottom anti-reflection coating for DUV lithography and preparation method and application thereof - Google Patents
Bottom anti-reflection coating for DUV lithography and preparation method and application thereof Download PDFInfo
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- CN115873175B CN115873175B CN202111146211.2A CN202111146211A CN115873175B CN 115873175 B CN115873175 B CN 115873175B CN 202111146211 A CN202111146211 A CN 202111146211A CN 115873175 B CN115873175 B CN 115873175B
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Abstract
The invention discloses a bottom anti-reflection coating for DUV lithography, and a preparation method and application thereof. The polymer disclosed by the invention is prepared by the following method: (1) preheating solvent I; (2) Mixing a monomer shown in a formula (A), a monomer shown in a formula (B), a monomer shown in a formula (C), a cross-linking agent shown in a formula (L), an initiator and a solvent II to obtain a mixed solution; (3) Adding the mixed solution into a preheated solvent for polymerization reaction; wherein, the step (1) and the step (2) are not sequentially carried out. The bottom anti-reflective coating is capable of reducing reflectivity, and no scum formed by the bottom anti-reflective coating is observed after spin coating the photoresist.
Description
Technical Field
The invention relates to a bottom anti-reflection coating for DUV lithography, a preparation method and application thereof.
Background
In recent years, due to the continuous high integration of large scale integrated circuits (large scale integrated circuit, LSI), the resolution of a photoresist used in a photolithography process has become a decisive factor for miniaturization of the photolithography process, particularly for performing an ultra-fine patterning process of 30nm node or less. Therefore, in the g-line or i-line region which is generally used, the wavelength of exposure light is further shortened, and thus, researches on photolithography using deep ultraviolet rays, krF excimer lasers, arF excimer lasers have been attracting attention.
However, when the wavelength of the exposure light source becomes short, the optical interference effect caused by the reflected light reflected on the layer to be etched of the semiconductor substrate increases, and problems of deterioration of the pattern profile or reduction of the dimensional uniformity occur due to undercut (undercut), notch (notch), or the like. In order to prevent the above-described problems, a bottom anti-reflective coating (BARCs) for absorbing exposure light (reflected light) is generally formed between the layer to be etched and the photoresist film.
The anti-reflective coating layer is classified into an inorganic bottom anti-reflective coating layer, which is used by optimizing reflectivity, and an organic bottom anti-reflective coating layer, which absorbs light passing through the photoresist film, according to the kind of materials used.
An inorganic bottom anti-reflective coating has excellent conformality (uniformity) to the bottom level difference, but is not easily removed in a subsequent process, and a phenomenon of pattern floating (patterning) often occurs, so that an organic bottom anti-reflective coating has been widely used in recent years.
In general, the organic bottom anti-reflective coating has an advantage that a vacuum evaporation apparatus, a chemical vapor deposition (chemical vapor deposition, CVD) apparatus, a sputtering (dispenser) apparatus, etc. for forming a film are not required, and the absorptivity to radiation is excellent, as compared with the inorganic bottom anti-reflective coating. Therefore, in order to reduce the reflectance as much as possible, a technique of preventing the reflection of the underlying film by disposing an organic anti-reflection coating layer containing light-absorbable organic molecules under the photoresist to adjust the reflectance becomes important. Currently, there is a need in the industry to develop excellent bottom anti-reflective coating (BARCs) materials.
Disclosure of Invention
The invention aims to overcome the defects of high reflectivity and frequent pattern floating of the existing bottom anti-reflection coating, and provides a bottom anti-reflection coating for DUV lithography, a preparation method and application thereof. The bottom anti-reflective coating for DUV lithography can adjust the reflectivity, and after spin coating the photoresist with the anti-reflective coating, no scum formed by the bottom anti-reflective coating is observed.
The invention provides a method for preparing a polymer for preparing a bottom anti-reflection coating, which comprises the following steps:
(1) Preheating the solvent I;
(2) Mixing a monomer shown in a formula (A), a monomer shown in a formula (B), a monomer shown in a formula (C), a cross-linking agent shown in a formula (L), an initiator and a solvent II to obtain a mixed solution;
the monomer shown in the formula (A) is 500-1000 parts by weight; the monomer shown in the formula (B) is 500-1000 parts by weight; the monomer shown in the formula (C) is 500-1000 parts by weight; the cross-linking agent shown in the formula (L) is used in an amount of 100-200 parts by weight.
(3) Adding the mixed solution into a preheated solvent for polymerization reaction;
wherein, the step (1) and the step (2) are not sequentially carried out.
In the preparation method of the polymer, the solvent I can be an organic solvent, preferably one or more of an aromatic hydrocarbon solvent, an ether solvent, a ketone solvent, an amide solvent, a sulfoxide solvent and an ester solvent. The aromatic solvent is preferably toluene and/or benzene. The ether solvent is preferably tetrahydrofuran. The ketone solvent is preferably methyl amyl ketone. The amide solvent is preferably N, N' -dimethylformamide. The sulfoxide solvent is preferably dimethyl sulfoxide. The ester solvent is preferably ethyl lactate and/or propylene glycol monomethyl ether acetate. More preferably, the organic solvent is an amide-based solvent and a ketone-based solvent, such as N, N' -dimethylformamide and methyl amyl ketone.
In the method for producing the polymer, the solvent I is preferably used in an amount of 600 to 1000 parts by weight, more preferably 1000 parts by weight. If two or more solvents are contained at the same time, the parts of different solvents are preferably the same. In the preparation method of the polymer, in the step (1), the solvent I is purged by nitrogen. The purge time is preferably 20 to 50 minutes, more preferably 30 minutes.
In the method for producing a polymer, in the step (1), the preheating temperature of the solvent I is preferably 80 to 100 ℃, more preferably 90 ℃.
In the preparation method of the polymer, the solvent II can be an organic solvent, preferably one or more of an aromatic hydrocarbon solvent, an ether solvent, a ketone solvent, an amide solvent, a sulfoxide solvent and an ester solvent. The aromatic solvent is preferably toluene and/or benzene. The ether solvent is preferably tetrahydrofuran. The ketone solvent is preferably methyl amyl ketone. The amide solvent is preferably N, N' -dimethylformamide. The sulfoxide solvent is preferably dimethyl sulfoxide. The ester solvent is preferably ethyl lactate and/or propylene glycol monomethyl ether acetate. More preferably, the organic solvent is an amide-based solvent and a ketone-based solvent, such as N, N' -dimethylformamide and methyl amyl ketone.
In the method for producing the polymer, the solvent II is preferably used in an amount of 6000 to 10000 parts by weight, more preferably 7000 parts by weight. If two or more solvents are contained at the same time, the parts of different solvents are preferably the same.
In the preparation method of the polymer, in the step (2), the monomer shown in the formula (A) is preferably used in an amount of 650-800 parts by weight.
In the preparation method of the polymer, in the step (2), the monomer shown in the formula (B) is preferably used in an amount of 650-800 parts by weight.
In the preparation method of the polymer, in the step (2), the monomer shown in the formula (C) is preferably used in an amount of 650-800 parts by weight.
In the preparation method of the polymer, in the step (2), the amount of the crosslinking agent shown in the formula (L) is preferably 150 parts by weight.
In the preparation method of the polymer, in the step (2), the initiator can be a free radical polymerization initiator or an ion polymerization initiator, preferably 2,2 '-azobis (isobutyronitrile) (AIBN), 2' -azobis-dimethyl- (2-methylpropionate), 2 '-azobis- (4-methoxy-2, 4-dimethylvaleronitrile), 2' -azobis (2-cyclopropylpropionitrile), 2 '-azobis (2, 4-dimethylvaleronitrile), a catalyst or a catalyst and a catalyst one of 1,1' -azobis (cyclohexane carbonitrile), benzoyl peroxide, tert-butyl peroxybenzoate, di-tert-butyl diperoxyphthalate, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxypivalate, tert-amyl peroxypivalate and butyllithium, more preferably 2,2 '-azobis (isobutyronitrile) and/or 2,2' -azobis-dimethyl- (2-methylpropionate).
In the preparation method of the polymer, in the step (2), the initiator is preferably used in an amount of 1 to 10wt%, more preferably 3 to 5wt%, and the percentage is the ratio of the weight of the initiator to the total weight of all monomers.
In the preparation method of the polymer, in the step (2), nitrogen is used for purging the mixed solution. The purge time is preferably 30 minutes.
In the preparation method of the polymer, in the step (3), the adding mode is preferably peristaltic pump introduction. The introduction time is preferably 2.5 hours.
In the method for preparing the polymer, in the step (3), the polymerization reaction temperature may be 50 to 200 ℃, preferably 60 to 150 ℃, and more preferably 80 to 120 ℃.
In the method for producing a polymer, in the step (3), the polymerization time is preferably 5 to 7 hours, more preferably 6 hours.
In the method for producing the polymer, the polymer may be isolated and purified by a post-treatment as is conventional in the art, or the reaction solution may be used as a raw material without isolating and purifying the polymer.
In the preparation method of the polymer, the polymerization reaction can use the conventional post-treatment in the field to comprise the following steps: cooling, adding an organic solvent to the reaction solution, removing a supernatant part, dissolving the remaining reaction mixture in tetrahydrofuran, pouring the resulting solution into water, filtering and drying.
In the method for producing a polymer, in the post-polymerization treatment, the cooling is preferably performed by cooling the reaction solution to room temperature.
In the method for producing a polymer, in the post-polymerization treatment, the organic solvent is preferably a poor solvent for the polymer but is a good solvent for the polymer solvent, more preferably n-hexane or n-heptane, and most preferably n-heptane. The amount of the organic solvent is preferably 6000 parts by weight.
In the method for producing a polymer, the amount of water used in the post-polymerization treatment is preferably 100000 parts by weight.
In the method for producing a polymer, the filtration is preferably reduced pressure filtration in the post-polymerization treatment.
In the method for preparing the polymer, in the post-polymerization treatment, the drying preferable condition is that the polymer is dried overnight in a vacuum oven. The temperature setting of the vacuum oven is preferably 45 ℃.
It is another object of the present invention to provide a polymer for preparing a bottom antireflective coating, which is prepared by the above method.
The polymer may be of any structure, such as a random copolymer or a block copolymer.
In the polymer, the molecular weight thereof is not particularly limited, and the molecular weight of the polymer obtained by the polymerization reaction may be controlled by various polymerization conditions such as polymerization time and temperature, concentration of monomers and initiator used in the reaction, reaction solvent, and the like. When the polymerization reaction is an ionic polymerization, the molecular weight of the polymer is preferably a narrow molecular weight distribution.
Among the polymers, the weight average molecular weight is preferably 2000 to 5000000 when measured by Gel Permeation Chromatography (GPC) with standard polystyrene, more preferably 3000 to 100000 in view of film forming property, solubility and thermal stability, and most preferably 5087, 5183, 5309, 5369, 6037, 6093, 6198 or 6511.
The number average molecular weight of the polymer is preferably 3000 to 6000, more preferably 3400, 3688, 3739, 3957, 4491, 5128, 5724 or 5788.
The polymer preferably has a polydispersity index (PDI) of 0.5 to 2, more preferably 0.89, 0.92, 1.27, 1.34, 1.39, 1.46, 1.54 or 1.82.
The present invention provides a composition for preparing a bottom antireflective coating comprising a polymer as described above, a solvent and a photoacid generator.
In the composition, the solvent may be any solvent, preferably one or more of an ether solvent, an ester solvent, an alcohol solvent, an aromatic hydrocarbon solvent, a ketone solvent and an amide solvent. The ether solvent is preferably one or more of propylene glycol monobutyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether and propylene glycol monomethyl ether. The ester solvent is preferably one or more of propylene glycol monobutyl ether acetate, methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, propylene glycol propyl ether acetate, ethyl 2-hydroxy-propionate, ethyl 2-hydroxy-2-methyl-propionate, ethyl ethoxyacetate, ethyl glycolate, methyl 2-hydroxy-3-methylbutanoate, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate, methyl pyruvate, ethyl acetate, butyl acetate, ethyl lactate, and butyl lactate. The alcohol solvent is preferably propylene glycol. The aromatic solvent is preferably toluene and/or xylene. The ketone solvent is preferably one or more of methyl ethyl ketone, cyclopentanone, and cyclohexanone. The amide solvent is preferably one or more of N, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone. The solvent is more preferably propylene glycol monobutyl ether and/or propylene glycol monobutyl ether acetate.
In the composition, the solvent is used in an amount capable of dissolving all components, preferably 1000 to 2500 parts by weight, more preferably 1200 to 2000 parts by weight, and most preferably 1500 to 1800 parts by weight.
In the composition, the photoacid generator can assist in the de-crosslinking of the crosslinked polymer upon exposure to light and thereby render the target bottom antireflective coating developable and photosensitive.
In the composition, the photoacid generator may be any compound capable of generating an acid upon exposure to KrF excimer laser (wavelength: 248 nm), arF excimer laser (wavelength: 193 nm), or the like, and is preferably one or more of an onium salt compound, a sulfonimide derivative, and a disulfonyl diazomethane compound.
In the composition, the onium salt compound is preferably an iodonium salt compound, a sulfonium salt compound or a crosslinkable onium salt compound in the photoacid generator. The iodonium salt compound is preferably one or more of diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethane sulfonate, diphenyliodonium nonafluoro n-butane sulfonate, diphenyliodonium perfluoro n-octane sulfonate, diphenyliodonium camphorsulfonate, bis (4-tert-butylphenyl) iodonium camphorsulfonate and bis (4-tert-butylphenyl) iodonium trifluoromethane sulfonate. The sulfonium salt compound is preferably one or more of triphenylsulfonium hexafluoroantimonate, triphenylsulfonium nonafluoro n-butane sulfonate, triphenylsulfonium camphorsulfonate and triphenylsulfonium trifluoromethane sulfonate, more preferably triphenylsulfonium hexafluoroantimonate and/or triphenylsulfonium trifluoromethane sulfonate. The crosslinkable onium salt compound is preferably bis (4-hydroxyphenyl) (phenyl) sulfonium trifluoromethane sulfonate, bis (4-hydroxyphenyl) (phenyl) sulfonium 1,2, 3, 4-nonafluorobutane-1-sulfonate phenyl bis (4- (2- (vinyloxy) ethoxy) -phenyl) sulfonium 1,2, 3, 4-octafluoro-butane-1, 4-disulfonate and tris (4-) one or more of (2- (vinyloxy) ethoxy) -phenyl) sulfonium 1,2, 3, 4-octafluoro-butane-1, 4-disulfonate.
In the composition, the sulfonimide derivative is preferably one or more of N- (trifluoromethanesulfonyl) succinimide, N- (fluoro-N-butanesulfonyloxy) succinimide, N- (camphorsulfonyl) succinimide and N- (trifluoromethanesulfonyl) naphthalene dicarboximide.
In the composition, the disulfonyl diazomethane compound is preferably one or more of bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (benzenesulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, bis (2, 4-dimethylbenzenesulfonyl) diazomethane and methylsulfonyl-p-toluenesulfonyl diazomethane.
The photoacid generator is preferably used in an amount of 0.01 to 20 parts by weight, more preferably 1 to 15 parts by weight, for example 5 to 10 parts by weight, in the composition.
The amount of the polymer in the composition is preferably 100 parts by weight.
The composition may also contain other additional components. The additional components include polymers other than the polymers described above, surfactants, and slip agents.
In the composition, the amount of the additional component is not particularly limited, and may be appropriately determined according to the target coating layer.
It is another object of the present invention to provide a method for preparing a composition for preparing a bottom antireflective coating, comprising the steps of: the components of the composition as described above are mixed.
In the preparation method of the composition, the mixing mode is preferably stirring, and the stirring is preferably carried out under the following conditions: stirring for 30 minutes at room temperature.
In the method for preparing the composition, the mixing may further include a filtering step, wherein the filtering mode may be filtering by using a filter, and the pore size of the filter is preferably 0.2-0.05 μm, and more preferably 0.05 μm.
In the preparation method of the composition, the composition prepared by the preparation method has excellent storage stability and can be stored for a long time at room temperature.
It is another object of the present invention to provide a bottom antireflective coating made from the composition as described above.
It is another object of the present invention to provide a method for preparing a bottom antireflective coating, which is prepared by a process comprising the steps of: the composition as described above is cast onto a semiconductor substrate and baked to provide a bottom antireflective coating.
In the method for preparing the bottom anti-reflection coating, the casting tool is preferably a spin coater or a coater, and is preferably a spin coater.
In the preparation method of the bottom anti-reflection coating, the semiconductor substrate is preferably one of a silicon/silicon dioxide coated substrate, a silicon nitride substrate, a silicon wafer substrate, a glass substrate or an ITO substrate, and more preferably is a silicon wafer substrate.
In the preparation method of the bottom anti-reflection coating, the baking temperature is preferably 80-250 ℃, more preferably 100-250 ℃, and most preferably 190 ℃.
In the method for preparing the bottom anti-reflection coating, the baking time is preferably 0.3 to 5 minutes, more preferably 0.5 to 2 minutes, and most preferably 1 minute.
The present invention also provides a method of forming a photoresist pattern on a bottom antireflective coating, comprising the steps of:
s1: coating a photoresist on the bottom anti-reflective coating;
s2, soft roasting;
s3: exposing;
s4: roasting;
s5: and (5) developing.
In the method of forming a photoresist pattern on the bottom anti-reflective coating layer, the photoresist may be conventional in the art, preferably a positive photoresist, a negative photoresist or a Negative Tone Development (NTD) photoresist, more preferably a positive photoresist, such as 248nm positive photoresist (SEPR-430 TM (manufactured by Shin-Etsu)) or 193nm positive photoresist (TOk corporation, tai-6990 PH).
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the soft baking temperature is preferably 100 to 140 ℃, more preferably 120 ℃. The soft baking time is preferably 0.5 to 2 minutes, more preferably 60 seconds.
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the light for exposure may be conventional in the art, preferably light having a wavelength of 13.5 to 248nm, more preferably KrF excimer laser (wavelength: 248 nm), arF excimer laser (wavelength: 193 nm) or extreme UV light (wavelength: 13.5 nm).
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the firing temperature is preferably 80 to 150 ℃, more preferably 100 to 140 ℃, and most preferably 130 ℃.
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the baking time is preferably 0.3 to 5 minutes, more preferably 0.5 to 2 minutes, and most preferably 60 seconds.
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the developing is performed using a developing solution. The developer can easily dissolve and remove the bottom antireflective coating.
The developing solution may be an alkaline developing solution, preferably an aqueous solution of an alkali metal hydroxide, an aqueous solution of a tertiary ammonium hydroxide or an aqueous solution of an amine. The aqueous solution of alkali metal hydroxide is preferably an aqueous solution of potassium hydroxide or an aqueous solution of sodium hydroxide. The aqueous solution of tertiary ammonium hydroxide is preferably an aqueous solution of tetramethylammonium hydroxide (TMAH), an aqueous solution of tetraethylammonium hydroxide, or an aqueous solution of choline. The aqueous amine solution is preferably an aqueous ethanolamine solution, an aqueous propylamine solution or an aqueous ethylenediamine solution. The developing solution is more preferably an aqueous solution of 2.38wt% tetramethylammonium hydroxide.
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the developing solution may further contain a surfactant.
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the temperature of the developing solution is preferably 5 to 50 c, more preferably 25 to 40 c.
In the method of forming a photoresist pattern on a bottom anti-reflective coating layer, the development time is preferably 10 to 300 seconds, more preferably 30 to 60 seconds.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The reagents and materials used in the present invention are commercially available.
The invention has the positive progress effects that: (1) The invention provides a bottom anti-reflection coating for DUV lithography, which can reduce reflectivity. (2) The bottom anti-reflective coating for DUV lithography is excellent in performance, and after spin coating the photoresist, the cross-sectional shape of the pattern is observed in the region exposed to the radiation, and no problem is found in its practical use, and no scum formed by the bottom anti-reflective coating is observed.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
In the description of the examples, "parts" and "%" refer to "parts by weight" and "wt%", respectively, unless otherwise specified.
Preparation of the Polymer
The polymers P1 to P8 and the polymer comparative examples CP1 to CP7 were prepared by the following procedure, and the amounts of the monomer represented by the formula (A), the monomer represented by the formula (B), the monomer represented by the formula (C) and the crosslinking agent represented by the formula (L) required for preparing each polymer were shown in Table 1.
N, N' -dimethylformamide (500 parts) and methyl amyl ketone (500 parts) were placed in parts by weight in a reaction vessel equipped with a stirrer, a condenser, a heater and a thermostat. The solvent was purged with nitrogen for 30 minutes and then heated to 90 ℃.
Separately, a monomer represented by formula (a), a monomer represented by formula (B), a monomer represented by formula (C), a crosslinking agent represented by formula (L), 2 '-azobis (isobutyronitrile) (radical polymerization initiator AIBN (100 parts)), N' -dimethylformamide (3500 parts), and methyl amyl ketone (3500 parts) were placed in a sample vessel in parts by weight and stirred. The resulting mixture solution was purged with nitrogen for 30 minutes.
The mixture solution was then introduced into the reaction vessel by peristaltic pump over a period of 2.5 hours. After the completion of the introduction, the reaction mixture was kept at 80℃for 6 hours.
After cooling to room temperature, the mixture was poured into n-heptane (60000 parts). The supernatant fraction was removed and the remaining reaction mixture was dissolved in tetrahydrofuran (6000 parts). The resulting solution was poured into water (100000 parts) to form a white precipitate. The precipitate was isolated by filtration under reduced pressure and dried in a vacuum oven at 45 ℃ overnight.
By drying, the copolymer was obtained in the form of a white powder. The weight average molecular weight Mw and the number average molecular weight of the product were measured by GPC (THF), and the polydispersity index PDI was calculated.
TABLE 1
Examples 1-16, comparative examples 17-30: preparation of bottom anti-reflective coating
The solvent and the photoacid generator were added to the polymer prepared as described above, and the amounts of the solvent and the photoacid generator are shown in Table 2. The obtained mixture was stirred at room temperature for 30 minutes, and then the mixture was filtered through a 0.05 μm pore size filter to prepare a composition for bottom anti-reflective coating layer in the form of a solution.
The bottom anti-reflective coating forming composition prepared was cast on a silicon microchip wafer by spin coating, and the bottom anti-reflective coatings of examples 1 to 16 and comparative examples 1 to 14 were prepared by firing crosslinking on a vacuum hotplate at 190℃for 60 seconds, wherein
The polymers used in Table 2 are the polymers P1 to P8 and CP1-CP7 prepared in Table 1 above.
TABLE 2
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Application and effects examples
1. Optical performance detection
The bottom antireflective coating obtained was measured by ellipsometry, and the refractive index (n value) and extinction coefficient (k value) at 248nm and 193nm were measured.
2. Development performance test
(1) Method for forming photoresist pattern on bottom anti-reflection coating layer when exposure light wavelength is 248nm and development performance detection
A commercially available 248nm positive photoresist (SEPR-430 (manufactured by Shin-Etsu)) was spin-coated on the obtained anti-reflective coating. The resist layer formed was soft baked at 120 ℃ on a vacuum hotplate and then imagewise exposed to 248nm radiation through a photomask. After post-exposure bake at 130 ℃ for 60 seconds, the resist layer was developed using 2.38wt% tmah in water. As a result of this development, the photoresist layer and the underlying bottom antireflective coating are removed in the areas defined by the photomask. In the areas exposed to the radiation, the solvent resistance of the antireflective coating was observed. The pattern cross-sectional shape was observed. In addition, it was observed whether the bottom antireflective coating formed scum.
(2) Method for forming photoresist pattern on bottom anti-reflection coating layer at 193nm exposure light wavelength and development performance detection
On the bottom antireflective coating obtained, a commercially available 193nm positive photoresist (TOK company, tai-6990 PH) was spin-coated. The formed resist layer was soft baked at 120 ℃ for 60 seconds on a vacuum hotplate and then imagewise wet exposed to 193nm radiation through a photomask. After post-exposure bake at 130 ℃ for 60 seconds, the resist layer was developed using 2.38wt% tmah in water. As a result of this development, the photoresist layer and underlying bottom antireflective coating are removed in the areas defined by the photomask. In the areas exposed to the radiation, the solvent resistance of the antireflective coating was observed. The pattern cross-sectional shape was observed. In addition, it was observed whether the bottom antireflective coating formed scum.
The effects of the anti-reflective coatings B1 to B16 prepared in examples 1 to 16 and the CBs 1 to CB14 prepared in comparative examples 1 to 14 are shown in table 3.
TABLE 3 Table 3
Remarks: regarding the cross-sectional shape of the pattern: a denotes that both the photoresist and the bottom antireflective coating show rectangular sides perpendicular to the substrate surface; b represents that both the photoresist and the bottom antireflective coating show sides that are not perpendicular but slightly oblique to the substrate surface, but do not have any problem in practice; c denotes that both the photoresist and the bottom antireflective coating show sides that are chimeric in shape relative to the substrate surface.
Regarding dross: a represents that no scum formed by the bottom antireflective coating was observed; b represents that slight scum formed by the bottom antireflective coating is observed, but practically negligible; c represents the observation of a large amount of scum formed by the bottom antireflective coating.
As can be seen from table 3, the bottom antireflective coating obtained is able to reduce the reflectivity; in addition to B12, 193nm positive photoresist and 248nm positive photoresist were spin-coated on the obtained bottom anti-reflective coating layer, respectively, and the cross-sectional shape of the pattern was observed in the region exposed to radiation so that both the photoresist and the bottom anti-reflective coating layer showed rectangular sides perpendicular to the substrate surface, and scum formed by the bottom anti-reflective coating layer was not observed. A 193nm positive photoresist and a 248nm positive photoresist were spin-coated on the obtained bottom anti-reflection coating B12, respectively, and the cross-sectional shape of the pattern was observed in the region exposed to radiation so that both the photoresist and the bottom anti-reflection coating showed sides not perpendicular but slightly inclined to the substrate surface, but there was no problem in practical use, and scum formed by the bottom anti-reflection coating was not observed. Most of the pattern cross-sectional shapes of the comparative examples were sides of the photoresist and the bottom anti-reflective coating layer each showing a mosaic shape with respect to the substrate surface, and a large amount of scum formed by the bottom anti-reflective coating layer was observed, affecting the use.
In summary, the present invention has developed a bottom anti-reflective coating for DUV lithography that can reduce the reflectivity, observe the cross-sectional shape of a pattern in a region exposed to radiation after spin coating a photoresist, and do not have any problems in its practical use, and no scum formed by the bottom anti-reflective coating is observed.
Claims (25)
1. A method for preparing a polymer for preparing a bottom antireflective coating, said method comprising the steps of:
(1) Preheating the solvent I;
(2) Mixing a monomer shown in a formula (A), a monomer shown in a formula (B), a monomer shown in a formula (C), a cross-linking agent shown in a formula (L), an initiator and a solvent II to obtain a mixed solution;
the monomer shown in the formula (A) is 650 parts by weight, the monomer shown in the formula (B) is 650 parts by weight, the monomer shown in the formula (C) is 650 parts by weight, and the cross-linking agent shown in the formula (L) is 100 parts by weight;
or the monomer shown in the formula (A) is 1000 parts by weight, the monomer shown in the formula (B) is 500 parts by weight, the monomer shown in the formula (C) is 500 parts by weight, and the cross-linking agent shown in the formula (L) is 150 parts by weight;
or the monomer shown in the formula (A) is 500 parts by weight, the monomer shown in the formula (B) is 1000 parts by weight, the monomer shown in the formula (C) is 500 parts by weight, and the cross-linking agent shown in the formula (L) is 200 parts by weight;
or the monomer shown in the formula (A) is 500 parts by weight, the monomer shown in the formula (B) is 500 parts by weight, the monomer shown in the formula (C) is 1000 parts by weight, and the crosslinking agent shown in the formula (L) is 100 parts by weight;
or the monomer shown in the formula (A) is 800 parts by weight, the monomer shown in the formula (B) is 800 parts by weight, the monomer shown in the formula (C) is 800 parts by weight, and the cross-linking agent shown in the formula (L) is 150 parts by weight;
or the monomer shown in the formula (A) is 650 parts by weight, the monomer shown in the formula (B) is 800 parts by weight, the monomer shown in the formula (C) is 650 parts by weight, and the cross-linking agent shown in the formula (L) is 200 parts by weight;
or the monomer shown in the formula (A) is 650 parts by weight, the monomer shown in the formula (B) is 650 parts by weight, the monomer shown in the formula (C) is 650 parts by weight, and the cross-linking agent shown in the formula (L) is 150 parts by weight;
(3) Adding the mixed solution into a preheated solvent I for polymerization reaction;
wherein, the step (1) and the step (2) are not sequentially carried out.
2. The method for producing a polymer according to claim 1, wherein in the step (1), the solvent I is an organic solvent;
and/or, in the step (1), the solvent I is used in an amount of 600 to 1000 parts by weight;
and/or, in the step (1), the solvent I is purged with nitrogen;
and/or, in the step (1), the preheating temperature of the solvent I is 80-100 ℃;
and/or, in the step (2), the solvent II is an organic solvent;
and/or, in the step (2), the dosage of the solvent II is 6000 to 10000 parts by weight;
and/or, in the step (2), the initiator is 2,2 '-azobis (isobutyronitrile), 2' -azobis-dimethyl- (2-methylpropionate), 2 '-azobis- (4-methoxy-2, 4-dimethyl valeronitrile), 2' -azobis (2-cyclopropyl propionitrile), 2 '-azobis (2, 4-dimethyl valeronitrile), a catalyst one of 1,1' -azobis (cyclohexane carbonitrile), benzoyl peroxide, t-butyl peroxybenzoate, di-t-butyl diperoxyphthalate, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxypivalate, t-amyl peroxypivalate, and butyllithium;
and/or, in the step (2), the initiator is used in an amount of 1-10wt%, and the percentage is the ratio of the weight of the initiator to the total weight of all monomers;
and/or, in the step (2), the mixed solution is purged by nitrogen;
and/or, in the step (3), the adding mode is peristaltic pump introduction;
and/or, in the step (3), the temperature of the polymerization reaction is 50-200 ℃;
and/or, in the step (3), the polymerization reaction time is 5-7 hours.
3. The method for producing a polymer according to claim 2, wherein in the step (1), the solvent I is one or more of an aromatic hydrocarbon solvent, an ether solvent, a ketone solvent, an amide solvent, a sulfoxide solvent and an ester solvent;
and/or, in the step (1), the solvent I is used in an amount of 1000 parts by weight;
and/or, in the step (1), the purging time is 20-50 minutes;
and/or, in the step (1), the preheating temperature of the solvent I is 90 ℃;
and/or, in the step (2), the solvent II is one or more of an aromatic hydrocarbon solvent, an ether solvent, a ketone solvent, an amide solvent, a sulfoxide solvent and an ester solvent;
and/or, in the step (2), the solvent II is used in an amount of 7000 parts by weight;
and/or, in the step (2), the initiator is 2,2 '-azobis (isobutyronitrile) and/or 2,2' -azobis-dimethyl- (2-methylpropionate);
and/or, in the step (2), the initiator is used in an amount of 3-5 wt%, and the percentage is the ratio of the weight of the initiator to the total weight of all monomers;
and/or, in the step (2), the purge time is 30 minutes;
and/or, in the step (3), the introducing time is 2.5 hours;
and/or, in the step (3), the temperature of the polymerization reaction is 60-150 ℃;
and/or, in the step (3), the polymerization time is 6 hours.
4. The method for producing a polymer according to claim 3, wherein in the step (1), the aromatic solvent is toluene and/or benzene;
and/or, in the step (1), the ether solvent is tetrahydrofuran;
and/or, in the step (1), the ketone solvent is methyl amyl ketone;
and/or, in the step (1), the amide solvent is N, N' -dimethylformamide;
and/or, in the step (1), the sulfoxide solvent is dimethyl sulfoxide;
and/or, in the step (1), the ester solvent is ethyl lactate and/or propylene glycol monomethyl ether acetate;
and/or, in the step (1), if two or more solvents are contained at the same time, the parts of different solvents are the same;
and/or, in the step (1), the purge time is 30 minutes;
and/or, in the step (2), the aromatic solvent is toluene and/or benzene;
and/or, in the step (2), the ether solvent is tetrahydrofuran;
and/or, in the step (2), the ketone solvent is methyl amyl ketone;
and/or, in the step (2), the amide solvent is N, N' -dimethylformamide;
and/or, in the step (2), the sulfoxide solvent is dimethyl sulfoxide;
and/or, in the step (2), the ester solvent is ethyl lactate and/or propylene glycol monomethyl ether acetate;
and/or, in the step (2), if two or more solvents are contained at the same time, the parts of different solvents are the same;
and/or, in the step (2), the initiator is 2,2' -azobis (isobutyronitrile);
and/or, in the step (3), the temperature of the polymerization reaction is 80-120 ℃.
5. The method for producing a polymer according to claim 3, wherein in the step (1), the solvent I is an amide-based solvent or a ketone-based solvent;
and/or, in the step (2), the solvent II is an amide solvent and a ketone solvent.
6. The method of preparing a polymer according to claim 5, wherein in the step (1), the solvent I is N, N' -dimethylformamide and methyl amyl ketone;
and/or, in the step (2), the solvent II is N, N' -dimethylformamide and methyl amyl ketone.
7. A polymer for preparing a bottom antireflective coating, characterized in that said polymer is prepared by a polymer preparation method according to any one of claims 1 to 6.
8. The polymer of claim 7, wherein the polymer has a weight average molecular weight of 2000 to 5000000;
and/or the number average molecular weight of the polymer is 3000-6000;
and/or the polymer polydispersity index is 0.5 to 2.
9. The polymer of claim 8, wherein the polymer has a weight average molecular weight of 3000 to 100000;
and/or the polymer has a number average molecular weight of 3400, 3688, 3739, 3957, 4491, 5128, 5724, or 5788;
and/or the polymer polydispersity index is 0.89, 0.92, 1.27, 1.34, 1.39, 1.46, 1.54, or 1.82.
10. The polymer of claim 9, wherein the polymer has a weight average molecular weight of 5087, 5183, 5309, 5369, 6037, 6093, 6198, or 6511.
11. A composition for preparing a bottom antireflective coating, characterized in that it comprises a polymer according to any one of claims 7 to 10, a solvent and a photoacid generator.
12. The composition of claim 11, wherein the solvent is one or more of an ether solvent, an ester solvent, an alcohol solvent, an aromatic solvent, a ketone solvent, and an amide solvent;
and/or the solvent is used in an amount of 1000 to 2500 parts by weight;
and/or the photoacid generator is one or more of an onium salt compound, a sulfonimide derivative and a disulfonyl diazomethane compound;
and/or the dosage of the photoacid generator is 0.01-20 parts by weight;
and/or the polymer is used in an amount of 100 parts by weight.
13. The composition of claim 12, wherein the ethereal solvent is one or more of propylene glycol monobutyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, and propylene glycol monomethyl ether;
and/or the ester solvent is one or more of propylene glycol monobutyl ether acetate, methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, propylene glycol propyl ether acetate, ethyl 2-hydroxy propionate, ethyl 2-hydroxy-2-methyl-propionate, ethyl ethoxyacetate, ethyl glycolate, methyl 2-hydroxy-3-methylbutanoate, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate, methyl pyruvate, ethyl acetate, butyl acetate, ethyl lactate and butyl lactate;
and/or, the alcohol solvent is propylene glycol;
and/or, the aromatic solvent is toluene and/or xylene;
and/or, the ketone solvent is one or more of methyl ethyl ketone, cyclopentanone and cyclohexanone;
and/or the amide solvent is one or more of N, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone;
and/or the solvent is used in an amount of 1200 to 2000 parts by weight;
and/or the photoacid generator is used in an amount of 1 to 15 parts by weight.
14. The composition of claim 12, wherein the solvent is propylene glycol monobutyl ether and/or propylene glycol monobutyl ether acetate;
and/or the solvent is used in an amount of 1500 to 1800 parts by weight;
and/or the use amount of the photoacid generator is 5 to 10 parts by weight.
15. The composition of claim 12, wherein the onium salt compound is an iodonium salt compound, a sulfonium salt compound, or a crosslinkable onium salt compound;
and/or the sulfone imide derivative is one or more of N- (trifluoromethanesulfonyl) succinimide, N- (fluoro-N-butane sulfonyl) succinimide, N- (camphorsulfonyl) succinimide and N- (trifluoromethanesulfonyl) naphthalimide;
and/or the disulfonyl diazomethane compound is one or more of bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, bis (2, 4-dimethylbenzenesulfonyl) diazomethane and methylsulfonyl-p-toluenesulfonyl diazomethane.
16. The composition of claim 15, wherein the iodonium salt compound is one or more of diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethane sulfonate, diphenyliodonium nonafluoro n-butane sulfonate, diphenyliodonium perfluoro n-octane sulfonate, diphenyliodonium camphorsulfonate, bis (4-t-butylphenyl) iodonium camphorsulfonate, and bis (4-t-butylphenyl) iodonium trifluoromethane sulfonate;
and/or the sulfonium salt compound is one or more of triphenylsulfonium hexafluoroantimonate, triphenylsulfonium nonafluoro n-butane sulfonate, triphenylsulfonium camphorsulfonate and triphenylsulfonium trifluoromethane sulfonate;
and/or the number of the groups of groups, the crosslinkable onium salt compound is bis (4-hydroxyphenyl) (phenyl) sulfonium trifluoromethane sulfonate, bis (4-hydroxyphenyl) (phenyl) sulfonium 1,2, 3, 4-nonafluorobutane-1-sulfonate phenyl bis (4- (2- (vinyloxy) ethoxy) -phenyl) sulfonium 1,2, 3, 4-octafluoro-butane-1, 4-disulfonate and tris (4-) one or more of (2- (vinyloxy) ethoxy) -phenyl) sulfonium 1,2, 3, 4-octafluoro-butane-1, 4-disulfonate.
17. A composition according to claim 16, characterised in that the sulfonium salt compound is triphenylsulfonium hexafluoroantimonate and/or triphenylsulfonium trifluoromethane sulfonate.
18. The composition of claim 11, further comprising additional components comprising a polymer other than the polymer of any one of claims 7-10, a surfactant, and a smoothing agent.
19. A method of preparing a composition for preparing a bottom antireflective coating, said method comprising the steps of: mixing the components of the composition of any one of claims 11 to 18.
20. The method of preparing a composition according to claim 19, wherein the mixing is by stirring.
21. The method of preparing the composition of claim 20, wherein the stirring conditions are room temperature stirring for 30 minutes.
22. The method of preparing a composition of claim 19, wherein said mixing is followed by a filtration step.
23. The method of preparing a composition according to claim 22, wherein the filtration is by filtration using a filter.
24. The method of preparing the composition of claim 23, wherein the filter has a pore size of 0.2 to 0.05 μm.
25. The method of preparing the composition of claim 24, wherein the filter has a pore size of 0.05 μm.
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