JP2013138053A - 研磨用組成物 - Google Patents
研磨用組成物 Download PDFInfo
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- JP2013138053A JP2013138053A JP2011287264A JP2011287264A JP2013138053A JP 2013138053 A JP2013138053 A JP 2013138053A JP 2011287264 A JP2011287264 A JP 2011287264A JP 2011287264 A JP2011287264 A JP 2011287264A JP 2013138053 A JP2013138053 A JP 2013138053A
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- JP
- Japan
- Prior art keywords
- polishing
- polishing composition
- acid
- indole
- silica
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000005498 polishing Methods 0.000 title claims abstract description 195
- 239000000203 mixture Substances 0.000 title claims abstract description 120
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 41
- 239000011229 interlayer Substances 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 28
- 150000007524 organic acids Chemical class 0.000 claims abstract description 22
- 239000007800 oxidant agent Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 9
- 150000003839 salts Chemical class 0.000 claims description 12
- 150000003863 ammonium salts Chemical group 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 9
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 abstract description 5
- 235000005985 organic acids Nutrition 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 150000001735 carboxylic acids Chemical class 0.000 abstract 1
- 239000008119 colloidal silica Substances 0.000 description 22
- -1 2-Nitrobenzoyl Ester Chemical class 0.000 description 19
- 239000011163 secondary particle Substances 0.000 description 10
- 239000008139 complexing agent Substances 0.000 description 9
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 9
- 239000011164 primary particle Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- 239000006061 abrasive grain Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 5
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 150000007522 mineralic acids Chemical class 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 4
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 150000002391 heterocyclic compounds Chemical group 0.000 description 4
- SUMDYPCJJOFFON-UHFFFAOYSA-N isethionic acid Chemical compound OCCS(O)(=O)=O SUMDYPCJJOFFON-UHFFFAOYSA-N 0.000 description 4
- FSYKKLYZXJSNPZ-UHFFFAOYSA-N sarcosine Chemical compound C[NH2+]CC([O-])=O FSYKKLYZXJSNPZ-UHFFFAOYSA-N 0.000 description 4
- BAXOFTOLAUCFNW-UHFFFAOYSA-N 1H-indazole Chemical compound C1=CC=C2C=NNC2=C1 BAXOFTOLAUCFNW-UHFFFAOYSA-N 0.000 description 3
- PWSZRRFDVPMZGM-UHFFFAOYSA-N 5-phenyl-1h-pyrazol-3-amine Chemical compound N1N=C(N)C=C1C1=CC=CC=C1 PWSZRRFDVPMZGM-UHFFFAOYSA-N 0.000 description 3
- KDCGOANMDULRCW-UHFFFAOYSA-N 7H-purine Chemical compound N1=CNC2=NC=NC2=C1 KDCGOANMDULRCW-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- XSCHRSMBECNVNS-UHFFFAOYSA-N benzopyrazine Natural products N1=CC=NC2=CC=CC=C21 XSCHRSMBECNVNS-UHFFFAOYSA-N 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000003002 pH adjusting agent Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 125000003396 thiol group Chemical group [H]S* 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 229920003169 water-soluble polymer Polymers 0.000 description 3
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 2
- KJUGUADJHNHALS-UHFFFAOYSA-N 1H-tetrazole Chemical compound C=1N=NNN=1 KJUGUADJHNHALS-UHFFFAOYSA-N 0.000 description 2
- HHYPDQBCLQZKLI-UHFFFAOYSA-N 2-[2-hydroxyethyl-[(5-methylbenzotriazol-1-yl)methyl]amino]ethanol Chemical compound CC1=CC=C2N(CN(CCO)CCO)N=NC2=C1 HHYPDQBCLQZKLI-UHFFFAOYSA-N 0.000 description 2
- BHNHHSOHWZKFOX-UHFFFAOYSA-N 2-methyl-1H-indole Chemical compound C1=CC=C2NC(C)=CC2=C1 BHNHHSOHWZKFOX-UHFFFAOYSA-N 0.000 description 2
- XLSZMDLNRCVEIJ-UHFFFAOYSA-N 4-methylimidazole Chemical compound CC1=CNC=N1 XLSZMDLNRCVEIJ-UHFFFAOYSA-N 0.000 description 2
- NSPMIYGKQJPBQR-UHFFFAOYSA-N 4H-1,2,4-triazole Chemical compound C=1N=CNN=1 NSPMIYGKQJPBQR-UHFFFAOYSA-N 0.000 description 2
- MVPKIPGHRNIOPT-UHFFFAOYSA-N 5,6-dimethyl-2h-benzotriazole Chemical compound C1=C(C)C(C)=CC2=NNN=C21 MVPKIPGHRNIOPT-UHFFFAOYSA-N 0.000 description 2
- LJUQGASMPRMWIW-UHFFFAOYSA-N 5,6-dimethylbenzimidazole Chemical compound C1=C(C)C(C)=CC2=C1NC=N2 LJUQGASMPRMWIW-UHFFFAOYSA-N 0.000 description 2
- LRUDIIUSNGCQKF-UHFFFAOYSA-N 5-methyl-1H-benzotriazole Chemical compound C1=C(C)C=CC2=NNN=C21 LRUDIIUSNGCQKF-UHFFFAOYSA-N 0.000 description 2
- OZFPSOBLQZPIAV-UHFFFAOYSA-N 5-nitro-1h-indole Chemical compound [O-][N+](=O)C1=CC=C2NC=CC2=C1 OZFPSOBLQZPIAV-UHFFFAOYSA-N 0.000 description 2
- ONYNOPPOVKYGRS-UHFFFAOYSA-N 6-methylindole Natural products CC1=CC=C2C=CNC2=C1 ONYNOPPOVKYGRS-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- 239000004471 Glycine Substances 0.000 description 2
- IVYPNXXAYMYVSP-UHFFFAOYSA-N Indole-3-carbinol Natural products C1=CC=C2C(CO)=CNC2=C1 IVYPNXXAYMYVSP-UHFFFAOYSA-N 0.000 description 2
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 description 2
- HNDVDQJCIGZPNO-YFKPBYRVSA-N L-histidine Chemical compound OC(=O)[C@@H](N)CC1=CN=CN1 HNDVDQJCIGZPNO-YFKPBYRVSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- FFDGPVCHZBVARC-UHFFFAOYSA-N N,N-dimethylglycine Chemical compound CN(C)CC(O)=O FFDGPVCHZBVARC-UHFFFAOYSA-N 0.000 description 2
- SEQKRHFRPICQDD-UHFFFAOYSA-N N-tris(hydroxymethyl)methylglycine Chemical compound OCC(CO)(CO)[NH2+]CC([O-])=O SEQKRHFRPICQDD-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- 108010077895 Sarcosine Proteins 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- QWCKQJZIFLGMSD-UHFFFAOYSA-N alpha-aminobutyric acid Chemical compound CCC(N)C(O)=O QWCKQJZIFLGMSD-UHFFFAOYSA-N 0.000 description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 2
- 229940024606 amino acid Drugs 0.000 description 2
- 235000001014 amino acid Nutrition 0.000 description 2
- 150000001413 amino acids Chemical class 0.000 description 2
- 230000002421 anti-septic effect Effects 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 2
- UCMIRNVEIXFBKS-UHFFFAOYSA-N beta-alanine Chemical compound NCCC(O)=O UCMIRNVEIXFBKS-UHFFFAOYSA-N 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- CVSVTCORWBXHQV-UHFFFAOYSA-N creatine Chemical compound NC(=[NH2+])N(C)CC([O-])=O CVSVTCORWBXHQV-UHFFFAOYSA-N 0.000 description 2
- XVOYSCVBGLVSOL-UHFFFAOYSA-N cysteic acid Chemical compound OC(=O)C(N)CS(O)(=O)=O XVOYSCVBGLVSOL-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- BTCSSZJGUNDROE-UHFFFAOYSA-N gamma-aminobutyric acid Chemical compound NCCCC(O)=O BTCSSZJGUNDROE-UHFFFAOYSA-N 0.000 description 2
- MNWFXJYAOYHMED-UHFFFAOYSA-N heptanoic acid Chemical compound CCCCCCC(O)=O MNWFXJYAOYHMED-UHFFFAOYSA-N 0.000 description 2
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- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
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- 238000007254 oxidation reaction Methods 0.000 description 2
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- 239000003755 preservative agent Substances 0.000 description 2
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- 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
- C09K3/1409—Abrasive particles per se
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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
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- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
- H01L21/02074—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers the processing being a planarization of conductive layers
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- 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
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- 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
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Abstract
【解決手段】本発明の研磨用組成物は、金属または層間絶縁膜を有する研磨対象物を研磨する用途で使用される研磨用組成物であって、スルホン酸やカルボン酸のような有機酸を固定化したシリカ及び酸化剤を含有することを特徴とする研磨用組成物である。
【選択図】なし
Description
<1>金属または層間絶縁膜を有する研磨対象物を研磨する用途で使用される研磨用組成物であって、有機酸を固定化したシリカ及び酸化剤を含有することを特徴とする研磨用組成物。
<2>前記研磨用組成物に、さらに塩を含む、研磨用組成物。
<3>前記塩がアンモニウム塩である、研磨用組成物。
<4>前記研磨用組成物に、さらに防食剤を含む、研磨用組成物。
<5>前記研磨用組成物のpHが6.0以下である、研磨用組成物。
<6>前記<1>〜<5>のいずれかの研磨用組成物を用いて、金属または層間絶縁膜を含有する研磨対象物を研磨することを特徴とする研磨方法。
<7>前記<1>〜<5>のいずれかの研磨用組成物を用いて、金属または層間絶縁膜を含有する研磨対象物を研磨する工程を有することを特徴とする基板の製造方法。
本実施形態の研磨用組成物は、有機酸を固定化したシリカ、および酸化剤を水に混合して調製される。
研磨用組成物中に含まれるシリカは、表面に有機酸を固定化したシリカである。中でも、有機酸を固定化したコロイダルシリカであることが好ましい。コロイダルシリカの表面への有機酸の固定化は、コロイダルシリカの表面に有機酸の官能基が化学的に結合することにより行われている。コロイダルシリカと有機酸を単に共存させただけではコロイダルシリカへの有機酸の固定化は果たされない。有機酸の一種であるスルホン酸をコロイダルシリカに固定化するのであれば、例えば、特開2010−269985号公報や“Sulfonic acid−functionalized silica through quantitative oxidation of thiol groups”, Chem. Commun. 246−247(2003)に記載の方法で行うことができる。具体的には、3−メルカプトプロピルトリメトキシシラン等のチオール基を有するシランカップリング剤をコロイダルシリカにカップリングさせた後に過酸化水素でチオール基を酸化することにより、スルホン酸が表面に固定化されたコロイダルシリカを得ることができる。あるいは、カルボン酸をコロイダルシリカに固定化するのであれば、例えば、“Novel Silane Coupling Agents Containing a Photolabile 2−Nitrobenzyl Ester for Introduction of a Carboxy Group on the Surface of Silica Gel”, Chemistry Letters, 3,228−229(2000)に記載の方法で行うことができる。具体的には、光反応性2−ニトロベンジルエステルを含むシランカップリング剤をコロイダルシリカにカップリングさせた後に光照射することにより、カルボン酸が表面に固定化されたコロイダルシリカを得ることができる。
研磨用組成物中に含まれる酸化剤は、金属を酸化して酸化膜を形成し、研磨しやすくする働きがある。具体的には、過酸化水素、金属酸化物、過酸化物、硝酸塩、ヨウ素酸塩、過ヨウ素酸塩、次亜塩素酸塩、亜塩素酸塩、塩素酸塩、過塩素酸塩、過硫酸塩、重クロム酸塩、過マンガン酸塩、有機酸化剤、オゾン水および銀(II)塩、鉄(III)塩が挙げられるが、過酸化水素、過ヨウ素酸、オキソンがより好ましく用いられる。
研磨用組成物のpHの値は特に制限はないが、好ましくは6以下である。pH6以下の場合、長期にわたり優れた分散安定性を有する研磨用組成物を得ることができる。一方で、pHが6〜中性付近になると、研磨用組成物の層間絶縁膜に対する研磨速度が低下する恐れがある。また、例えば研磨対象物に含有される金属がタングステンの場合、中性やアルカリ領域では溶解が進み、段差やシームといったパターン不良につながる。これらの理由から研磨用組成物のpHの値は6以下であるとより高い効果が得られる。
・ 本実施形態の研磨用組成物は、スルホン酸やカルボン酸等の有機酸を固定化したシリカ及び酸化剤を含有する。特に、本実施形態の研磨用組成物のpHが6以下である場合、長期にわたり優れた分散安定性を有する研磨用組成物が得られる。その理由は、例えばシリカがコロイダルシリカの場合、有機酸を固定化したコロイダルシリカのゼータ電位はマイナスであり、かつ有機酸が固定化されていない通常のコロイダルシリカに比べて、研磨用組成物中でのゼータ電位の絶対値が大きい傾向にある。研磨用組成物中でのゼータ電位の絶対値が大きくなるにつれて、シリカ粒子同士の間の静電的斥力が強まるために、コロイダルシリカの凝集は起こりにくくなる。その結果として、研磨用組成物の分散安定性が良好となり、保管安定性や砥粒の凝集によるスクラッチといった問題が起きない。例えば酸性のpH領域において、有機酸を固定化したコロイダルシリカのゼータ電位は一般に−15mV以下の負の値を示すのに対し、通常のコロイダルシリカのゼータ電位はゼロに近い値を示す。
・ 前記実施形態の研磨用組成物は、塩をさらに含有してもよい。塩は、添加することで砥粒の持つ電荷二重層を小さくし、砥粒と層間絶縁膜の間の反発を小さくし、層間絶縁膜の研磨レートを向上させることができる。ここでいう塩とは、酸由来の陰イオンと塩基由来の陽イオンがイオン結合した化合物をいう。使用できる塩としては、金属不純物の観点からアンモニウム塩が好ましく、中でも塩化アンモニウム、過塩素酸アンモニウム、硫酸アンモニウム、硝酸アンモニウム、炭酸アンモニウム、酢酸アンモニウムが好ましい。
、5−メトキシ−1H−インドール、6−メトキシ−1H−インドール、7−メトキシ−1H−インドール、4−クロロ−1H−インドール、5−クロロ−1H−インドール、6−クロロ−1H−インドール、7−クロロ−1H−インドール、4−カルボキシ−1H−インドール、5−カルボキシ−1H−インドール、6−カルボキシ−1H−インドール、7−カルボキシ−1H−インドール、4−ニトロ−1H−インドール
、5−ニトロ−1H−インドール、6−ニトロ−1H−インドール、7−ニトロ−1H−インドール、4−ニトリル−1H−インドール、5−ニトリル−1H−インドール、6−ニトリル−1H−インドール、7−ニトリル−1H−インドール、2,5−ジメチル−1H−インドール、1,2−ジメチル−1H−インドール、1,3−ジメチル−1H−インドール、2,3−ジメチル−1H−インドール、5−アミノ−2,3−ジメチル−1H−インドール、7−エチル−1H−インドール、5−(アミノメチル)インドール、2−メチル−5−アミノ−1H−インドール、3−ヒドロキシメチル−1H−インドール、6−イソプロピル−1H−インドール、5−クロロ−2−メチル−1H−インドールなどが含まれる。中でも好ましい防食剤は、3−アミノ−5−フェニルピラゾール、1H−ベンゾトリアゾール、5−メチル−1H−ベンゾトリアゾール、5,6−ジメチル−1H−ベンゾトリアゾール、1−[N,N−ビス(ヒドロキシエチル)アミノメチル]−5−メチルベンゾトリアゾール、1,2,4−トリアゾール、及び5−ニトロ−1H−インドールである。
研磨用組成物中の防食剤の含有量はまた、5g/L以下であることが好ましく、より好ましくは2g/L以下、さらに好ましくは1g/L以下である。防食剤の含有量が少なくなるにつれて、研磨用組成物による研磨対象物の研磨速度はより向上する。
シリカ及び酸化剤を、必要に応じて塩、防食剤及びpH調整剤とともに水と混合することにより、実施例1〜6及び比較例1〜2の研磨用組成物を調製した。各研磨用組成物中の成分の詳細、及び各研磨用組成物のpHを測定した結果を表1に示す。なお、表1における“-”表記は、該当する成分を含有していないことを示す。
Claims (7)
- 金属または層間絶縁膜を有する研磨対象物を研磨する用途で使用される研磨用組成物であって、有機酸を固定化したシリカ及び酸化剤を含有することを特徴とする研磨用組成物。
- さらに塩を含む、請求項1に記載の研磨用組成物。
- 前記塩がアンモニウム塩である、請求項2に記載の研磨用組成物。
- さらに防食剤を含む、請求項1に記載の研磨用組成物。
- 前記研磨用組成物のpHが6.0以下である、請求項1〜4のいずれか一項に記載の研磨用組成物。
- 請求項1〜5のいずれか一項に記載の研磨用組成物を用いて、金属または層間絶縁膜を有する研磨対象物を研磨することを特徴とする研磨方法。
- 請求項1〜5のいずれか一項に記載の研磨用組成物を用いて、金属または層間絶縁膜を有する研磨対象物を研磨する工程を有することを特徴とする基板の製造方法。
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EP12862165.3A EP2800124A4 (en) | 2011-12-28 | 2012-12-25 | POLISHING COMPOSITION |
KR1020147020380A KR20140108563A (ko) | 2011-12-28 | 2012-12-25 | 연마용 조성물 |
SG11201403552SA SG11201403552SA (en) | 2011-12-28 | 2012-12-25 | Polishing composition |
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US14/368,458 US20140349484A1 (en) | 2011-12-28 | 2012-12-25 | Polishing composition |
SG10202010470RA SG10202010470RA (en) | 2011-12-28 | 2012-12-25 | Polishing Composition |
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Also Published As
Publication number | Publication date |
---|---|
SG10201604608QA (en) | 2016-07-28 |
SG11201403552SA (en) | 2014-10-30 |
CN104025265B (zh) | 2018-01-12 |
TWI576415B (zh) | 2017-04-01 |
TW201341515A (zh) | 2013-10-16 |
WO2013099866A1 (ja) | 2013-07-04 |
CN104025265A (zh) | 2014-09-03 |
SG10202010470RA (en) | 2020-11-27 |
KR20140108563A (ko) | 2014-09-11 |
EP2800124A1 (en) | 2014-11-05 |
EP2800124A4 (en) | 2015-08-12 |
US20140349484A1 (en) | 2014-11-27 |
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