WO2010011080A2 - 폴리실리콘 연마정지제를 함유하는 화학 기계적 연마 조성물 - Google Patents
폴리실리콘 연마정지제를 함유하는 화학 기계적 연마 조성물 Download PDFInfo
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- WO2010011080A2 WO2010011080A2 PCT/KR2009/004055 KR2009004055W WO2010011080A2 WO 2010011080 A2 WO2010011080 A2 WO 2010011080A2 KR 2009004055 W KR2009004055 W KR 2009004055W WO 2010011080 A2 WO2010011080 A2 WO 2010011080A2
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- Prior art keywords
- acid
- polishing
- chemical mechanical
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- polysilicon
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/04—Aqueous dispersions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
Definitions
- the present invention relates to a highly selective chemical mechanical polishing composition used in a process of planarizing a semiconductor substrate in which a polishing stop film and an insulating film as a polishing target film coexist in a semiconductor device manufacturing technology, and a chemical mechanical polishing method using the same.
- CMP chemical mechanical polishing
- a CMP substrate is fabricated containing both an insulating film such as a silicon oxide film and a polishing stop film such as a silicon nitride film.
- the thickness of the isolation insulating film in the shallow trench isolation (STI) process of the semiconductor device is used.
- STI shallow trench isolation
- the finer the pattern the smaller the tolerance range for dishing or the erosion of the polishing stop film, so that a high selectivity CMP composition having a very high polishing rate ratio is required to improve such defects. to be.
- the CMP composition used in the lower STI (shallow trench isolation) process of the semiconductor device has a lower polishing rate than the conventional silicon nitride film as the polishing stop film.
- Speed The polishing stop film polishing speed increases.
- the existing selectivity ratio (insulation film polishing rate: silicon nitride polishing rate) is about 30: 1 to 40: 1, but a higher selectivity of 50: 1 or more is required to obtain high flatness.
- Korean Patent Publication No. 2008-0003485 discloses a CMP slurry containing polyethylene glycol as a ceria abrasive and a polymer additive, and containing an acid to maintain a pH of 2 to 7,
- a CMP containing a triblock copolymer comprising a first polyethylene oxide repeat unit, a polypropylene oxide repeat unit, and a second polyethylene oxide repeat unit as a nonionic surfactant adsorbed on a surface of a polysilicon film to lower polishing rate Compositions are known.
- 0793240 discloses a CMP composition containing a nonionic surfactant such as polyoxyethylene ether-based or polyoxyethylene ester-based as an additive that is adsorbed on the surface of the hydrophobic membrane to protect the hydrophobic membrane from the ceria abrasive.
- a nonionic surfactant such as polyoxyethylene ether-based or polyoxyethylene ester-based as an additive that is adsorbed on the surface of the hydrophobic membrane to protect the hydrophobic membrane from the ceria abrasive.
- an insulating film CMP composition using a conventional polysilicon film as a polishing stop film has a weak protective function of the polysilicon film, making it difficult to suppress defects in a polysilicon film having a low hardness, and there is a problem in the post-CMP cleaning property, so improvement is necessary. Do.
- An object of the present invention is to provide a high polishing selectivity of the insulating film to the polysilicon film in order to reduce the variation of the electrical characteristics of the device in the process of chemical mechanical polishing the substrate containing the polysilicon film as the insulating film and the polishing stop film at the same time, the hardness is high
- the present invention provides a chemical mechanical polishing (CMP) composition that protects a low polysilicon film to suppress defects such as scratches and improves cleaning after the CMP process.
- CMP chemical mechanical polishing
- the present invention provides a chemical mechanical polishing composition that can be used in a CMP process using a polishing stop film such as polysilicon to keep the thickness of an insulating film constant in a lower shallow trench isolation (STI) process of a semiconductor device.
- a polishing stop film such as polysilicon
- another object of the present invention is to polish a semiconductor substrate containing an insulating film and a polysilicon film using a chemical mechanical polishing composition capable of suppressing the polishing of the polysilicon film and suppressing the occurrence of surface defects of the low-polysilicon film as described above. To provide a way.
- the present invention provides a chemical mechanical polishing (CMP) composition containing abrasive particles and a polishing stopper capable of suppressing polysilicon film polishing, and a method of polishing a semiconductor substrate using the same.
- CMP chemical mechanical polishing
- the polishing rate of the polysilicon film, which is the polishing stop film is lower than that of the insulating film, which is the polishing target film, on the patterned wafer, the thickness of the insulating film can be uniformed over the entire wafer area after polishing, and the variation of the thickness of the insulating film with respect to the pattern density is reduced. It can be made small, which makes it possible to keep the electrical characteristics uniform, which is advantageous.
- the selection ratio (insulation film polishing rate: polysilicon polishing rate) is 50: 1 or more, and the polishing rate of the polishing stop film (for example, polysilicon film) is preferably 100 kPa / min or less.
- the selection ratio is 100: 1 or more and the polishing rate of the polishing stop film is 50 kW / min or less, and the selection ratio is 200: 1 or more and most preferably the polishing rate of the polishing stop film is 30 Pa / min or less.
- the present invention provides a chemical mechanical polishing composition containing a polysilicon polishing stopper capable of suppressing polysilicon film polishing as described above, and specifically, the polishing stopper comprises: 1) a molecular structure composed of three or more branches; Branched molecule, a central atom is nitrogen or carbon, compound containing three or more ethylene oxide groups (-CH 2 CH 2 O-), salts or mixtures thereof, 2) one functional group ionized in the aqueous solution state Or a compound containing at least three ethylene oxide groups (—CH 2 CH 2 O—), salts thereof, or mixtures thereof, or a mixture of 1) and 2).
- Polysilicon polishing stopper according to the present invention is excellent in the adsorption of the polysilicon film, excellent in the polishing inhibition performance of the polysilicon film, polysilicon film surface by forming a uniform and robust protective film in the CMP process with low hardness compared to the insulating film It serves to suppress the occurrence of surface defects in the silicon film.
- the polysilicon polishing stopper according to the present invention has the advantage that can be effectively removed by the cleaning liquid containing deionized water in the cleaning process after the CMP process.
- the present invention relates to a chemical mechanical polishing composition used in a process of planarizing a semiconductor substrate in which a polysilicon film coexists as an insulating film and a polishing stop film, and a chemical mechanical polishing method using the same.
- the chemical mechanical polishing composition of the insulating film-containing substrate according to the present invention comprises: i) 1) a branched molecule whose molecular structure is composed of three or more branches, whose central atom is nitrogen or carbon, and three or more ethylene oxide groups (-CH 2) in the molecule.
- More preferred polysilicon polishing stopper is a condition that satisfies both the above conditions 1) and 2), that is, 3 to 10,000 ethylene oxide groups (-CH 2 CH 2 O-) in the molecule, the molecular structure It is a branched molecule composed of three or more branches, and may be selected from a compound, a salt thereof, or a mixture thereof, wherein the central atom is nitrogen or carbon and contains one or more functional groups to be ionized in an aqueous solution.
- the polysilicon film polishing stopper specifically includes a compound of Formula 1 to Formula 3 or a mixture thereof.
- R 1 and R 4 may be independently any substituent including 3 to 10000, preferably 5 to 1000 ethylene oxide groups (-CH 2 CH 2 O-). ,
- R 1 and R 4 may be specifically selected from the following structures.
- a polyoxyethylene amine ether compound represented by the following general formula (4) may be mentioned.
- R is hydrogen (H), (C1-C30) Alkyl, (C2-C30) Alkenyl, (C2-C30) Alkynyl, (C6-C30) Ar (C1-C30) Alkyl ( aralkyl), or at least one ionic selected from carboxyl group, sulfonic acid group, sulfuric acid group, phosphorous acid group, phosphoric acid group, amine group May have a functional group; (a + b) is an integer of 5 to 1000, preferably an integer of 10 to 500.]
- the polyoxyethylene amine ether compounds include polyoxyethylene lauryl amine ether (CAS.NO 61791-14-8), polyoxyethylene stearylamine ether (CAS.NO 26635-92-7), polyoxyethylene oleyl Amine ethers (CAS.NO 26635-92-7) and the like.
- the compound has a branched structure having three branches of molecular structure, the central atom is nitrogen, the number of ethylene oxide groups (a + b) is 5 to 1000, and can form cations in aqueous solution.
- the polysilicon polishing stopper according to the present invention has more ethylene oxide groups, it is more advantageous for suppressing polysilicon film polishing and scratching of the polysilicon film, but if the ethylene oxide groups are too large, the viscosity of the composition rises and is disadvantageous. 3 to 10000, more preferably 5 to 1000, most preferably 10 to 300.
- the case where the molecular structure is branched is preferable because of its ability to suppress polishing of the polysilicon film and generation of defects of the polysilicon film.
- the number of the branches constituting the molecule is preferably three or more, the central atom may be made of nitrogen or carbon, and more preferably the ethylene oxide group is contained in two or more branches.
- the polishing stopper has a function of suppressing the polishing rate of the silicon nitride film and thus may play an auxiliary role of lowering the polishing rate of the silicon nitride film.
- the polishing stopper should be easily cleaned after polishing, for this purpose it is advantageous to be easily dissolved in an aqueous solution, it is advantageous to have a functional group capable of forming ions in the molecule.
- the preferred amount of the polysilicon film polishing stopper in the polishing composition according to the present invention is 0.1 to 10000 ppm, more preferably 1 to 2000 ppm, most preferably 10 to 1000 ppm. If the content of the polysilicon film polishing stopper is too small, the polishing suppression function and the scratch suppression function of the polysilicon film are weak. If the content is too high, the polishing rate of the insulating film is lowered and the viscosity is increased.
- the insulating films constituting the semiconductor substrate include low-k film, polysilazane (PSZ) film, high density plasma chemical vapor deposition (HDP-CVD), plasma-enhanced TEOS (PETOS), borophosphorus silicate glass (BPSG), USG (undoped silicate glass), PSG (phosphorus silicate glass), BSG (boro silicate glass), SOG (spin on glass) film and the like can be included.
- PSZ polysilazane
- HDP-CVD high density plasma chemical vapor deposition
- PETOS plasma-enhanced TEOS
- BPSG borophosphorus silicate glass
- USG undoped silicate glass
- PSG phosphorus silicate glass
- BSG boro silicate glass
- SOG spin on glass
- the polishing composition according to the present invention may include abrasive particles, and may be used by selecting one or more from the group consisting of silica, cerium oxide, zirconium oxide, aluminum oxide and zeolite.
- cerium oxide has a lower hardness than silica particles or aluminum oxide particles, cerium oxide is included as abrasive particles because the polishing rate of the surface containing silicon oxide is very fast and the polysilicon polishing rate is low, which is advantageous for producing a high selectivity slurry. It is desirable to.
- the cerium oxide particles may be prepared by heat-treating precursors such as cerium carbonate, cerium nitrate, cerium hydroxide, and by grinding through attrition milling containing a non-reactive medium.
- Dispersants can be added during milling.
- large particles can be removed by a classification process and a filtration process by sedimentation or centrifugation in a gravitational field during particle production.
- Abrasive particles may be prepared and stored in a separate dispersion, and may be mixed with the remaining composition before use.
- the content of the abrasive grains is important for ensuring a sufficient polishing rate, and may vary depending on the desired polishing rate.
- the content of the abrasive grains is 0.01 to 10% by weight, preferably 0.03. To 3% by weight and more preferably 0.05 to 0.5% by weight. If the content is small, the polishing rate tends to be slow, and if the content is high, scratches are likely to occur on the polished film.
- the size of the cerium oxide abrasive grains is preferably 10 nm to 1000 nm, more preferably 30 to 300 nm, and most preferably 30 to 120 nm, in consideration of scratches and polishing rates. Smaller particle sizes result in slower polishing rates, and larger ones often cause scratches.
- the polishing composition according to the present invention can be used in a wide range of pH, but if the pH is too low or too high, the insulating film polishing rate is low, or the polishing inhibiting function of the polysilicon film is weakened.
- the preferred pH range is pH 3-11, more preferably pH 4-8, most preferably pH 5.5-6.8.
- the pH adjusting agent for adjusting the pH is an acidic pH adjusting agent selected from inorganic acids such as nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, perchloric acid, high molecular organic acid, or organic acid which can adjust the pH without adversely affecting the properties of the polishing composition.
- Basic pH adjusters selected from inorganic or organic bases such as KOH, ammonium hydroxide, quaternary amine hydroxides (e.g. tetramethylammonium hydroxide), amines, aminoalcohols, etc.
- Phosphoric acid additionally has the effect of improving the defects of the polysilicon film.
- the amount of the amount to be adjusted to the desired pH is sufficient, and the range of appropriate amount of use may vary depending on the type of pH regulator.
- Preferred content of the pH regulator is 0.001 to 10% by weight, more preferably 0.01 to 3% by weight.
- the acidic pH adjusting agent may include acetic acid, propionic acid, succinic acid, adipic acid, lactic acid, phthalic acid, and gluconic acid having a carboxyl group. It is preferable to use organic acids such as gluconic acid, citric acid, tartaric acid, malic acid, high molecular organic acids such as polyacrylic acid or polyacrylic acid copolymer, or mixtures thereof.
- organic acids such as gluconic acid, citric acid, tartaric acid, malic acid, high molecular organic acids such as polyacrylic acid or polyacrylic acid copolymer, or mixtures thereof.
- a polyvalent organic acid having a plurality of carboxyl groups in the polishing composition since there is a buffering effect of suppressing the pH change, it is easy to adjust the pH at the time of manufacture, and more preferable since the action of inhibiting the pH change after the preparation.
- the polymeric organic acid has a secondary polysilicon polishing inhibiting function in addition to the pH adjusting function.
- Commercially available polyacrylic acid products often do not have a specified molecular weight, and are usually sold in the form of an aqueous solution, and thus the content of polyacrylic acid varies from product to product.
- the viscosity of the above 2.5% polyacrylic acid aqueous solution contained in the additive for semiconductor polishing slurry according to the present invention was 0.8 to 20 cps.
- the polyacrylic acid L is a 2.5% aqueous solution. It is a product of Nippon Pure Chemical Co., Ltd. having a viscosity of 1.67 cps, and polyacrylic acid K is a product of Sigma Aldrich, whose viscosity is 2.27 cps in a 2.5% aqueous solution.
- organic amine or amino alcohol can be used as said basic pH adjuster.
- organic amine or amino alcohol can be used as said basic pH adjuster.
- examples include ethylamine, propylamine, butylamine, diethylamine, dipropylamine, dibutylamine, triethylamine, tributylamine, monoethanolamine, diethanolamine, triethanolamine (TEA), 2-dimethylamino -2-methyl-1-propanol, 1-amino-2-propanol, 1-dimethylamino-2-propanol, 3-dimethylamino-1-propanol, 2-amino-1-propanol, 2-dimethylamino-1- Propanol, 2-diethylamino-1-propanol, 2-diethylamino-1-ethanol, 2-ethylamino-1-ethanol, 1- (dimethylamino) 2-propanol, N-methyldiethanolamine, N- Propyl diethanolamine, N-
- a dishing inhibitor, a preservative, a lubricant, etc. may be additionally added as necessary in addition to the polysilicon polishing stopper, abrasive particles, and pH adjusting agent.
- Disinhibitors include tris [2- (isopropylamino) ethyl] amine, tris [2- (ethylamino) ethyl] amine (tris [2- (ethylamino) ethyl] amine), tris [2- (methylamino) ethyl] amine, 1,2-bis (dimethylamino) ethane [1,2-bis (dimethylamino) ethane (BDMAE) ], N, N, N ', N'-tetraethylethylenediamine (N, N, N', N'-Tetraethylethylenediamine), N, N'-diethyl-N, N'-diethylethylenediamine (N, N'-diethyl-N, N'-dimethylethylenediamine), N, N-diethyl-N ', N'-dimethylethylenediamine), N, N-diethyl-N '
- the amount of dishing inhibitor may be 0.001 to 5% by weight, preferably 0.005 to 1% by weight, more preferably 0.01 to 0.5% by weight. If the content of dishing inhibitor is too small, the dishing suppression function is weak, and if too much, the polishing rate of the insulating film is lowered.
- lubricants examples include glycerin and ethylene glycol.
- the amount of lubricant may be used 0.01 to 10% by weight, preferably 0.1 to 2% by weight.
- a preservative may be used to prevent this change due to the decay caused by the attack of bacteria, bacteria, and fungi. Any preservative can be used as long as it can suppress the decay of the slurry composition constituents of the present invention. As preservatives, preservatives containing isothiazoline compounds may be used.
- Preferred examples thereof include 5-chloro-2-methyl-4-isothiazolin-3-one (5-chloro-2-methyl-4-isothiazolin- 3-one), 2-methyl-4-isothiazolin-3-one, 2-methyl-3-isothiazolone , 1,2-benzisothiazolin-3-one (1,2-benzisothiazolin-3-one). If the amount of the preservative is small, the preservative function is weak, and if the amount is too large, the function as the abrasive is impaired, so it is preferable to use it in the range of 0.005% to 0.2% by weight based on the total weight of the composition.
- the preferred polishing composition according to the present invention contains 1 to 2000 ppm of polysilicon film polishing stopper, 0.01 to 10% by weight of cerium oxide abrasive particles, and has a pH of 3 to 11, and more preferably, the polishing composition is polysilicon polishing stopper. 1 to 2000 ppm, 0.03 to 3% by weight of cerium oxide abrasive particles, 0.001 to 10% by weight of one or more pH regulators selected from organic organic acids, phosphoric acid, organic acids and aminoalcohols or mixtures thereof, and a pH of 4 to 8.
- the most preferred polishing composition is 1 to 2000 ppm of polysilicon polishing stopper, 0.03 to 3% by weight of cerium oxide abrasive particles, 0.01 to 3% by weight of pH adjuster selected from organic organic acid, phosphoric acid, organic acid, aminoalcohol or mixtures thereof, dishing It contains 0.001 to 5% by weight of inhibitor and has a pH of 4 to 8.
- the present invention provides a method for polishing a semiconductor substrate containing an insulating film and a polysilicon film using the chemical mechanical polishing composition as described above, and when using the polishing composition according to the present invention to suppress the polishing of the polysilicon film CMP processes that require high selectivity can be performed.
- the chemical mechanical polishing composition according to the present invention can be used for chemical mechanical polishing of a substrate containing both an insulating film and a polysilicon polishing stop film to prevent the occurrence of variations in the electrical properties of the device by using it for polishing an insulating film requiring a high selectivity. It has an effect.
- Cerium carbonate hydrate was calcined at 800 ° C. for 4 hours to produce cerium oxide, followed by grinding and dispersing with deionized water and a small amount of dispersant, followed by grinding and dispersing with a medium-stirring powder grinder. Finally, a cerium oxide dispersion having a solid content of 5% by weight was obtained. The secondary particle size of the dispersion was 100 nm, and the pH was 8.4.
- Substrates used for polishing were PETEOS films, polysilicon films, and PSZ films. They are polished at a rotational speed of 93 rpm and 87 rpm and a pressure of 300 g / cm 2 on a Poli 400 CMP machine with a membrane head of G & P Tech. The feed rate of the polishing composition was 200 mL / min.
- the surface of the polysilicon film was observed under an optical microscope, and the occurrence of defects such as scratches or pit on the polysilicon film was indicated by numerical values of 1 to 5.
- the number of defects observed in an area of 4 cm x 4 cm is 100 or more, 4 is 100 to 50, 3 is 50 to 20, 2 is 20 to 10, and 1 is 10 or less.
- the polishing properties of the PSZ film were evaluated according to the content of polysilicon polishing stopper.
- polishing rate and polishing selectivity for the silicon nitride film were evaluated.
- the polysilicon polishing stopper of the present invention also plays an additional role of reducing the silicon nitride polishing rate to improve the selectivity, and the polishing composition of the present invention is also excellent in polishing using silicon nitride as the polishing stopper film. Indicates.
Abstract
Description
Claims (14)
- i) 1) 분자 구조가 3개 이상의 가지로 구성된 가지형 분자이며, 중심원자가 질소 또는 탄소이며, 분자 내에 3개 이상의 에틸렌옥사이드기(-CH2CH2O-)를 포함하는 화합물, 그의 염 또는 그의 혼합물, 2) 수용액 상태에서 이온화되는 작용기 1개 이상과 에틸렌옥사이드기(-CH2CH2O-) 3개 이상을 함께 포함하는 화합물, 그의 염 또는 그의 혼합물, 또는 1)과 2)의 혼합물로부터 선택되는 폴리실리콘 연마정지제; 및ii) 실리카, 산화세륨, 산화지르코늄, 산화알루미늄 및 제올라이트로 이루어진 군으로부터 선택되는 1종 이상의 연마입자;를 함유하는 절연막 연마용 화학 기계적 연마 조성물.
- 제 1항에 있어서,전체 연마 조성물에 대하여 폴리실리콘 연마정지제로 0.1 ppm 내지 10000 ppm 및 산화세륨 연마입자 0.01 내지 10 중량%를 함유하며 pH 3 내지 11 인 절연막 연마용 화학 기계적 연마 조성물.
- 제 2항에 있어서,상기 폴리실리콘 연마정지제는 하기 화학식 1 내지 화학식 3로 표시되는 화합물 및 이들의 혼합물로 이루어진 군으로부터 선택되는 절연막 연마용 화학 기계적 연마 조성물.[화학식 1][화학식 2][상기 화학식 1 내지 화학식 2에서 R1 및 R4는 독립적으로 3 내지 10000개의 에틸렌 옥사이드기(-CH2CH2O-)를 포함하는 치환기이고,R2, R3, R5 및 R6은 독립적으로 (C1~C30)알킬, (C2~C30)알케닐, (C2~C30)알키닐, (C6~C30)아르(C1~C30)알킬 또는 (x = 0 내지 1000, y = 1 내지 1000), -CH2(OCH2CH2)n-NH2 (n = 0 내지 50), -CH2(OCH2CH2)n-OH (n = 0 내지 50), -CH2(OCH2CH2)n-OC(=0)CH2CH2CH2COOH (n = 0 내지 50)로부터 선택되며,R7은 수소이거나, (C1~C30)알킬, (C2~C30)알케닐, (C2~C30)알키닐, (C6~C30)아르(C1~C30)알킬 또는 (x = 0 내지 1000, y = 1 내지 1000), -CH2(OCH2CH2)n-NH2 (n = 0 내지 50), -CH2(OCH2CH2)n-OH (n = 0 내지 50), -CH2(OCH2CH2)n-OC(=0)CH2CH2CH2COOH (n = 0 내지 50)로부터 선택된다.][화학식 3]R8-(OCH2CH2)z-R9[상기 화학식 3에서 R9는 -(OCH2CHCH3)n-NH2 (n = 0 내지 50), -OCH2COOH, -OC(=O)CH2CH(SO3H)-COOH, -OCH2CH2CH2S(=O)2OH, 카르복시기, 술폰산기, 황산기, 아인산기, 인산기로부터 선택되며, R8는 수소(H)이거나, (C1~C30)알킬, (C2~C30)알케닐, (C2~C30)알키닐, (C6~C30)아르(C1~C30)알킬, -CH2COOH, -CH2(CH2CH2O)n-NH2 (n= 0 내지 50), -CH2(CH2CH2O)n-OH (n= 0 내지 50), -CH2(CH2CH2O)n-OC(=0)CH2CH2CH2COOH (n= 0 내지 50)로부터 선택되며, z는 5 내지 10000이다.]
- 제 2항에 있어서,상기 폴리실리콘 연마정지제는 분자구조가 3개 이상의 가지로 구성된 가지형 분자이며, 중심원자가 질소 또는 탄소이며, 분자 내에 에틸렌옥사이드기(-CH2CH2O-) 5개 내지 1000개이며, 수용액상태에서 이온화되는 작용기 1개 이상을 포함하는 화합물, 그의 염 또는 그의 혼합물로부터 선택되는 것을 특징으로 하는 절연막 연마용 화학 기계적 연마 조성물.
- 제 2항에 있어서,상기 폴리실리콘 연마정지제는 하기 화학식 4로 표시되는 화합물 및 이들의 혼합물로 이루어진 군으로부터 선택되는 절연막 연마용 화학 기계적 연마 조성물.[화학식 4][상기 화학식 4에서, R은 수소(H)이거나, (C1~C30)알킬, (C2~C30)알케닐, (C2~C30)알키닐, (C6~C30)아르(C1~C30)알킬, 또는 (x= 0 내지 1000, y= 1 내지 1000)로부터 선택되고, 상기 알킬, 알케닐, 알키닐 및 아르알킬은 카르복시기, 술폰산기, 황산기, 아인산기, 인산기, 아민기로부터 선택되는 하나 이상의 이온성 작용기를 가질 수 있으며; (a+b)는 5 내지 1000의 정수이다.]
- 제 3항에 있어서,상기 연마입자는 분산액 내의 2차 입경이 10 내지 1000 nm인 산화세륨인 절연막 연마용 화학 기계적 연마 조성물.
- 제 3항에 있어서,상기 pH는 질산, 염산, 황산, 인산, 과염소산, 고분자유기산, 유기산으로부터 선택되는 산성 pH 조절제; 및 수산화칼륨, 암모늄하이드록사이드, 4급아민 하이드록사이드, 아민, 아미노알콜로부터 선택되는 염기성 pH 조절제; 중 1종 이상으로 조절되는 절연막 연마용 화학 기계적 연마 조성물.
- 제 7항에 있어서,산성 pH 조절제는 질산, 인산, 아세트산, 프로피온산, 숙신산, 아디프산, 락트산, 프탈산, 글루콘산, 구연산, 타르타르산, 말산, 폴리 아크릴산 또는 폴리 아크릴산 공중합체 및 이들의 혼합물로 이루어진 군으로부터 선택되는 절연막 연마용 화학 기계적 연마 조성물.
- 제 7항에 있어서,상기 염기성 pH 조절제로는 에틸아민, 프로필아민, 부틸아민, 디에틸아민, 디프로필아민, 디부틸아민, 트리에틸아민, 트리부틸아민, 모노에탄올아민, 디에탄올아민, 트리에탄올아민, 2-디메틸아미노-2-메틸-1-프로판올, 1-아미노-2-프로판올, 1-디메틸아미노-2-프로판올, 3-디메틸아미노-1-프로판올, 2-아미노-1-프로판올, 2-디메틸아미노-1-프로판올, 2-디에틸아미노-1-프로판올, 2-디에틸아미노-1-에탄올, 2-에틸아미노-1-에탄올, 1-(디메틸아미노)2-프로판올, N-메틸디에탄올아민, N-프로필디에탄올아민, N-이소프로필디에탄올아민, N-(2-메틸프로필)디에탄올아민, N-n-부틸디에탄올아민, N-t-부틸에탄올아민, N-시아클로헥실디에탄올아민, 2-(디메틸아미노)에탄올, 2-디에틸아미노에탄올, 2-디프로필아미노에탄올, 2-브틸아미노에틴올, 2-t-부틸아미노에탄올, 2-사이클로아미노에탄올, 2-아미노-2-펜타놀, 2-[비스(2-하이드록시에틸)아미노]-2-메틸-1-프로판올, 2-[비스(2-하이드록시에틸)아미노]-2-프로판올, N,N-비스(2-하이드록시프로필)에탄올아민, 2-아미노-2-메틸-1-프로판올, 트리스(하이드록시메틸)아미노메탄, 트리아이소프로판올아민 및 이들의 혼합물로 이루어진 군으로부터 선택되는 절연막 연마용 화학 기계적 연마 조성물.
- 제 7항에 있어서,상기 연마 조성물은 디싱억제제, 윤활제 및 방부제로부터 선택되는 하나 이상을 더 함유하는 절연막 연마용 화학 기계적 연마 조성물.
- 제 10항에 있어서,디싱억제제는 트리스[2-(이소프로필아미노)에틸]아민, 트리스[2-(에틸아미노)에틸]아민, 트리스[2-(메틸아미노)에틸]아민, 1,2-비스(디메틸아미노)에탄, N,N,N',N'-테트라에틸에틸렌디아민, N,N'-디에틸-N,N'-디에틸에틸렌디아민, N,N-디에틸-N',N'-디메틸에틸렌디아민, N,N,N',N'',N''-펜타메틸디에틸렌트리아민, N,N'-디메틸에틸렌디아민, N,N'-디에틸에틸렌디아민, N,N'-비스(2-히드록시에틸)에틸렌디아민, N,N-디메틸-N'-에틸에틸렌디아민, N,N-디에틸-N'-메틸에틸렌디아민, N,N,N'-트리메틸에틸렌디아민, N,N,N'-트리에틸에틸렌디아민, N-에틸-N'-메틸에틸렌디아민, 1-(2-아미노에틸)피롤리딘, 2-(2-(메틸아미노)-에틸아미노)-에탄올, 1-(2-아미노에틸)피페리딘, 4-(3-아미노프로필)모폴린, 4-(2-아미노에틸)모폴린, 피페라진, 1-메틸피페라진, 2-메틸피페라진, 1-에틸피페라진, 1-이소프로필피페라진, 1-부틸피페라진, 1-(2-메톡시에틸)피페라진, 1-(2-에톡시에틸)피페라진, 1,2,4-트리메틸피페라진, 2,3,5,6-테트라메틸피페라진, 1-(2-아미노에틸)피페라진, 1-(2-히드록시에틸)피페라진, 1,4-디메틸피페라진, 2,6-디메틸피페라진, 2,5-디메틸피페라진, 2-피페라지노에틸아민, 1,4-비스(3-아미노프로필)피페라진, 1-[2-(디메틸아미노)에틸]피페라진, N,N'-비스-(2-히드록시에틸)-2,5-디메틸피페라진 및 이들의 혼합물로 이루어진 군으로부터 선택되는 절연막 연마용 화학 기계적 연마 조성물.
- 제 7항에 있어서,전체 연마 조성물에 대하여 폴리실리콘 연마정지제 1 내지 2000 ppm, 산화세륨 연마입자 0.03 내지 3 중량%, 산성 pH 조절제 또는 염기성 pH 조절제로부터 선택되는 하나 이상의 pH 조절제 0.001 내지 10 중량%를 함유하며, pH가 4 내지 8인 절연막 연마용 화학 기계적 연마 조성물.
- 제 10항에 있어서,전체 연마 조성물에 대하여 폴리실리콘 연마정지제 1 내지 2000 ppm, 산화세륨 연마입자 0.03 내지 3 중량%, 고분자유기산, 인산, 유기산, 아미노알콜 또는 이들의 혼합물로부터 선택되는 pH 조절제 0.01 내지 3 중량%, 디싱억제제를 0.001 내지 5 중량%를 함유하며, pH가 4 내지 8인 절연막 연마용 화학 기계적 연마 조성물.
- 제 1항 내지 제 13항으로부터 선택되는 어느 한 항에 따른 화학 기계적 연마 조성물을 사용하여 절연막을 함유하는 반도체 기판을 연마하는 방법.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013540850A (ja) * | 2010-09-08 | 2013-11-07 | ビーエーエスエフ ソシエタス・ヨーロピア | N−置換ジアゼニウムジオキシド及び/又はn’−ヒドロキシジアゼニウムオキシド塩を含有する水性研磨剤組成物 |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012121086A (ja) * | 2010-12-07 | 2012-06-28 | Yokkaichi Chem Co Ltd | 研磨用添加剤及び高分散性研磨スラリー |
IN2014CN00877A (ko) * | 2011-08-09 | 2015-04-03 | Basf Se | |
US20140273458A1 (en) * | 2013-03-12 | 2014-09-18 | Air Products And Chemicals, Inc. | Chemical Mechanical Planarization for Tungsten-Containing Substrates |
US8906252B1 (en) * | 2013-05-21 | 2014-12-09 | Cabot Microelelctronics Corporation | CMP compositions selective for oxide and nitride with high removal rate and low defectivity |
JP2015086355A (ja) * | 2013-09-27 | 2015-05-07 | 株式会社フジミインコーポレーテッド | 研磨用組成物、研磨方法、及び基板の製造方法 |
US9281210B2 (en) | 2013-10-10 | 2016-03-08 | Cabot Microelectronics Corporation | Wet-process ceria compositions for polishing substrates, and methods related thereto |
CN104726028A (zh) * | 2013-12-18 | 2015-06-24 | 安集微电子(上海)有限公司 | 一种化学机械抛光液及其使用方法 |
CN103820079B (zh) * | 2014-02-21 | 2014-12-10 | 无锡研奥电子科技有限公司 | 用于氮化镓材料的研磨组合物及其制备方法 |
JP6243791B2 (ja) | 2014-05-09 | 2017-12-06 | 信越化学工業株式会社 | Cmp研磨剤及びその製造方法、並びに基板の研磨方法 |
KR102209788B1 (ko) * | 2014-06-27 | 2021-01-29 | 동우 화인켐 주식회사 | 금속막의 식각액 조성물 및 이를 이용한 액정표시장치용 어레이 기판의 제조방법 |
KR102204224B1 (ko) * | 2014-06-30 | 2021-01-18 | 동우 화인켐 주식회사 | 금속막의 식각액 조성물 및 이를 이용한 액정표시장치용 어레이 기판의 제조방법 |
JP6170027B2 (ja) | 2014-10-09 | 2017-07-26 | 信越化学工業株式会社 | Cmp研磨剤及びその製造方法、並びに基板の研磨方法 |
EP3234049B1 (en) * | 2014-12-16 | 2020-12-02 | Basf Se | Chemical mechanical polishing (cmp) composition for high effective polishing of substrates comprising germanium |
CN105778774A (zh) * | 2014-12-23 | 2016-07-20 | 安集微电子(上海)有限公司 | 一种化学机械抛光液 |
GB2524638B (en) * | 2015-02-06 | 2016-04-06 | Ceres Ip Co Ltd | Electrolyte forming process |
US10570313B2 (en) * | 2015-02-12 | 2020-02-25 | Versum Materials Us, Llc | Dishing reducing in tungsten chemical mechanical polishing |
KR102544644B1 (ko) * | 2015-12-24 | 2023-06-19 | 솔브레인 주식회사 | 유기막 연마용 슬러리 조성물 및 이를 이용한 반도체 기판 연마 방법 |
US10483108B2 (en) | 2017-04-28 | 2019-11-19 | Taiwan Semiconductor Manufacturing Company, Ltd. | Semiconductor device and method of manufacture |
US11203703B2 (en) * | 2018-03-20 | 2021-12-21 | Samsung Display Co., Ltd. | Polishing slurry and method of polishing substrate by using the polishing slurry |
KR20200076991A (ko) * | 2018-12-20 | 2020-06-30 | 주식회사 케이씨텍 | Sti 공정용 연마 슬러리 조성물 |
KR102337949B1 (ko) * | 2019-07-10 | 2021-12-14 | 주식회사 케이씨텍 | 멀티 필름 연마용 cmp 슬러리 조성물 및 그를 이용한 연마 방법 |
JP2021147445A (ja) * | 2020-03-17 | 2021-09-27 | ジークライト株式会社 | 研磨材及び研磨組成物 |
CN115698207A (zh) * | 2020-05-29 | 2023-02-03 | 弗萨姆材料美国有限责任公司 | 用于浅槽隔离应用的低凹陷氧化物cmp抛光组合物及其制备方法 |
JP7235164B2 (ja) | 2021-01-06 | 2023-03-08 | 株式会社レゾナック | 研磨液、研磨液セット及び研磨方法 |
WO2024091101A1 (ko) * | 2022-10-28 | 2024-05-02 | 솔브레인 주식회사 | 화학적 기계적 연마 슬러리 조성물 및 반도체 소자의 제조 방법 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003104343A2 (en) * | 2002-06-07 | 2003-12-18 | Cabot Microelectronics Corporation | Method for chemical mechanical polishing (cmp) of low-k dielectric materials |
JP2004123921A (ja) * | 2002-10-02 | 2004-04-22 | Fujimi Inc | 研磨用組成物 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022625A (en) * | 1974-12-24 | 1977-05-10 | Nl Industries, Inc. | Polishing composition and method of polishing |
JP4092006B2 (ja) * | 1998-03-04 | 2008-05-28 | 花王株式会社 | 研磨液組成物 |
JP2000160139A (ja) * | 1998-12-01 | 2000-06-13 | Fujimi Inc | 研磨用組成物およびそれを用いた研磨方法 |
JP2003347247A (ja) * | 2002-05-28 | 2003-12-05 | Hitachi Chem Co Ltd | 半導体絶縁膜用cmp研磨剤及び基板の研磨方法 |
JP2005209800A (ja) * | 2004-01-21 | 2005-08-04 | Fujitsu Ltd | 半導体装置の製造方法 |
KR100637772B1 (ko) * | 2004-06-25 | 2006-10-23 | 제일모직주식회사 | 반도체 sti 공정용 고선택비 cmp 슬러리 조성물 |
WO2006112519A1 (ja) * | 2005-04-14 | 2006-10-26 | Showa Denko K.K. | 研磨組成物 |
WO2007055278A1 (ja) * | 2005-11-11 | 2007-05-18 | Hitachi Chemical Co., Ltd. | 酸化ケイ素用研磨剤、添加液および研磨方法 |
KR100793240B1 (ko) * | 2006-06-02 | 2008-01-10 | 삼성전자주식회사 | 슬러리 조성물, 이를 이용한 연마 방법 및 불휘발성 메모리장치의 제조 방법 |
KR100829594B1 (ko) * | 2006-10-10 | 2008-05-14 | 삼성전자주식회사 | 화학 기계적 연마용 슬러리 조성물 및 이를 이용한 반도체메모리 소자의 제조 방법 |
-
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- 2008-07-24 KR KR1020080072072A patent/KR101094662B1/ko active IP Right Grant
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- 2009-07-22 CN CN2009801329795A patent/CN102131885A/zh active Pending
- 2009-07-22 WO PCT/KR2009/004055 patent/WO2010011080A2/ko active Application Filing
- 2009-07-22 JP JP2011519989A patent/JP2011529269A/ja active Pending
- 2009-07-22 US US13/055,322 patent/US20110124195A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003104343A2 (en) * | 2002-06-07 | 2003-12-18 | Cabot Microelectronics Corporation | Method for chemical mechanical polishing (cmp) of low-k dielectric materials |
JP2004123921A (ja) * | 2002-10-02 | 2004-04-22 | Fujimi Inc | 研磨用組成物 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013540850A (ja) * | 2010-09-08 | 2013-11-07 | ビーエーエスエフ ソシエタス・ヨーロピア | N−置換ジアゼニウムジオキシド及び/又はn’−ヒドロキシジアゼニウムオキシド塩を含有する水性研磨剤組成物 |
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CN102131885A (zh) | 2011-07-20 |
KR101094662B1 (ko) | 2011-12-20 |
US20110124195A1 (en) | 2011-05-26 |
JP2011529269A (ja) | 2011-12-01 |
WO2010011080A3 (ko) | 2010-05-14 |
KR20100011030A (ko) | 2010-02-03 |
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