WO2021065815A1 - カチオンを含むレーザーマーク周辺の隆起を解消するための研磨用組成物 - Google Patents
カチオンを含むレーザーマーク周辺の隆起を解消するための研磨用組成物 Download PDFInfo
- Publication number
- WO2021065815A1 WO2021065815A1 PCT/JP2020/036667 JP2020036667W WO2021065815A1 WO 2021065815 A1 WO2021065815 A1 WO 2021065815A1 JP 2020036667 W JP2020036667 W JP 2020036667W WO 2021065815 A1 WO2021065815 A1 WO 2021065815A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polishing composition
- mass
- polishing
- silicate
- ion
- Prior art date
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 168
- 239000000203 mixture Substances 0.000 title claims abstract description 120
- 150000001768 cations Chemical class 0.000 title description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 114
- -1 tetraalkylammonium ion Chemical class 0.000 claims abstract description 43
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 35
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 125000005207 tetraalkylammonium group Chemical group 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims abstract description 6
- 150000004820 halides Chemical class 0.000 claims abstract description 6
- 150000004679 hydroxides Chemical class 0.000 claims abstract description 6
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims abstract description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 46
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 36
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052710 silicon Inorganic materials 0.000 claims description 19
- 239000010703 silicon Substances 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000011164 primary particle Substances 0.000 claims description 11
- 239000004111 Potassium silicate Substances 0.000 claims description 9
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 9
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 9
- 235000019353 potassium silicate Nutrition 0.000 claims description 9
- 150000005622 tetraalkylammonium hydroxides Chemical class 0.000 claims description 9
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 claims description 7
- YOMFVLRTMZWACQ-UHFFFAOYSA-N ethyltrimethylammonium Chemical compound CC[N+](C)(C)C YOMFVLRTMZWACQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 claims description 4
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 abstract 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract 4
- 229910052682 stishovite Inorganic materials 0.000 abstract 4
- 229910052905 tridymite Inorganic materials 0.000 abstract 4
- 239000000378 calcium silicate Substances 0.000 abstract 1
- 229910052918 calcium silicate Inorganic materials 0.000 abstract 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract 1
- 235000012431 wafers Nutrition 0.000 description 43
- 239000006061 abrasive grain Substances 0.000 description 12
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 12
- 239000002738 chelating agent Substances 0.000 description 11
- 238000007517 polishing process Methods 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 239000000908 ammonium hydroxide Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 239000012736 aqueous medium Substances 0.000 description 3
- 239000011362 coarse particle Substances 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- APSPVJKFJYTCTN-UHFFFAOYSA-N tetramethylazanium;silicate Chemical compound C[N+](C)(C)C.C[N+](C)(C)C.C[N+](C)(C)C.C[N+](C)(C)C.[O-][Si]([O-])([O-])[O-] APSPVJKFJYTCTN-UHFFFAOYSA-N 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical compound NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000011101 absolute filtration Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003729 cation exchange resin Substances 0.000 description 2
- 229920001429 chelating resin Polymers 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 125000000962 organic group Chemical group 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 2
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 description 1
- DIWZKTYQKVKILN-VKHMYHEASA-N (2s)-2-(dicarboxymethylamino)pentanedioic acid Chemical compound OC(=O)CC[C@@H](C(O)=O)NC(C(O)=O)C(O)=O DIWZKTYQKVKILN-VKHMYHEASA-N 0.000 description 1
- VKZRWSNIWNFCIQ-UHFFFAOYSA-N 2-[2-(1,2-dicarboxyethylamino)ethylamino]butanedioic acid Chemical compound OC(=O)CC(C(O)=O)NCCNC(C(O)=O)CC(O)=O VKZRWSNIWNFCIQ-UHFFFAOYSA-N 0.000 description 1
- URDCARMUOSMFFI-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(2-hydroxyethyl)amino]acetic acid Chemical compound OCCN(CC(O)=O)CCN(CC(O)=O)CC(O)=O URDCARMUOSMFFI-UHFFFAOYSA-N 0.000 description 1
- DMQQXDPCRUGSQB-UHFFFAOYSA-N 2-[3-[bis(carboxymethyl)amino]propyl-(carboxymethyl)amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)CCCN(CC(O)=O)CC(O)=O DMQQXDPCRUGSQB-UHFFFAOYSA-N 0.000 description 1
- SZHQPBJEOCHCKM-UHFFFAOYSA-N 2-phosphonobutane-1,2,4-tricarboxylic acid Chemical compound OC(=O)CCC(P(O)(O)=O)(C(O)=O)CC(O)=O SZHQPBJEOCHCKM-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- FSVCELGFZIQNCK-UHFFFAOYSA-N N,N-bis(2-hydroxyethyl)glycine Chemical compound OCCN(CCO)CC(O)=O FSVCELGFZIQNCK-UHFFFAOYSA-N 0.000 description 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- JYXGIOKAKDAARW-UHFFFAOYSA-N N-(2-hydroxyethyl)iminodiacetic acid Chemical compound OCCN(CC(O)=O)CC(O)=O JYXGIOKAKDAARW-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical group [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical group [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- JQDCIBMGKCMHQV-UHFFFAOYSA-M diethyl(dimethyl)azanium;hydroxide Chemical compound [OH-].CC[N+](C)(C)CC JQDCIBMGKCMHQV-UHFFFAOYSA-M 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- KVFVBPYVNUCWJX-UHFFFAOYSA-M ethyl(trimethyl)azanium;hydroxide Chemical compound [OH-].CC[N+](C)(C)C KVFVBPYVNUCWJX-UHFFFAOYSA-M 0.000 description 1
- DEFVIWRASFVYLL-UHFFFAOYSA-N ethylene glycol bis(2-aminoethyl)tetraacetic acid Chemical compound OC(=O)CN(CC(O)=O)CCOCCOCCN(CC(O)=O)CC(O)=O DEFVIWRASFVYLL-UHFFFAOYSA-N 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000006174 pH buffer Substances 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001415 sodium ion Chemical group 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- WJZPIORVERXPPR-UHFFFAOYSA-L tetramethylazanium;carbonate Chemical compound [O-]C([O-])=O.C[N+](C)(C)C.C[N+](C)(C)C WJZPIORVERXPPR-UHFFFAOYSA-L 0.000 description 1
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- JAJRRCSBKZOLPA-UHFFFAOYSA-M triethyl(methyl)azanium;hydroxide Chemical compound [OH-].CC[N+](C)(CC)CC JAJRRCSBKZOLPA-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- 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
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02024—Mirror polishing
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- 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
-
- 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
- C09K3/1409—Abrasive particles per se
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/544—Marks applied to semiconductor devices or parts, e.g. registration marks, alignment structures, wafer maps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/544—Marks applied to semiconductor devices or parts
- H01L2223/54406—Marks applied to semiconductor devices or parts comprising alphanumeric information
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/544—Marks applied to semiconductor devices or parts
- H01L2223/54413—Marks applied to semiconductor devices or parts comprising digital information, e.g. bar codes, data matrix
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/544—Marks applied to semiconductor devices or parts
- H01L2223/5442—Marks applied to semiconductor devices or parts comprising non digital, non alphanumeric information, e.g. symbols
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/544—Marks applied to semiconductor devices or parts
- H01L2223/54453—Marks applied to semiconductor devices or parts for use prior to dicing
Definitions
- the present invention relates to a polishing composition used for polishing the surface of a wafer, and particularly for polishing to make a flat polishing surface without a height difference in the peripheral portion of the wafer (also referred to as a laser mark portion) in the polishing process of the wafer.
- a polishing composition used for polishing the surface of a wafer, and particularly for polishing to make a flat polishing surface without a height difference in the peripheral portion of the wafer (also referred to as a laser mark portion) in the polishing process of the wafer.
- a polishing composition used for polishing the surface of a wafer, and particularly for polishing to make a flat polishing surface without a height difference in the peripheral portion of the wafer (also referred to as a laser mark portion) in the polishing process of the wafer.
- Silicon wafers used in semiconductor products are mirror-finished through a wrapping process (coarse polishing process) and a polishing process (precision polishing process).
- the polishing step includes a preliminary polishing step (preliminary polishing step) and a finish polishing step (finish polishing step).
- a mark such as a barcode, a number, or a symbol may be attached to a silicon wafer by irradiating the surface of the silicon wafer with a laser beam for the purpose of identification or the like.
- the laser mark is generally applied after the silicon substrate wrapping step is completed and before the polishing step is started.
- the irradiation of laser light for attaching a laser mark causes a ridge (swelling) on the surface of the silicon wafer around the laser mark.
- the laser mark portion of the silicon wafer itself is not used in the final product, but if the ridge is not properly eliminated in the polishing step after the laser mark is applied, the yield may decrease more than necessary. Therefore, it is desirable to appropriately eliminate the ridge around the laser mark in the pre-polishing step.
- Eliminating the ridge of the laser mark is to reduce the height from the reference plane (horizontal plane) around the laser mark of the wafer to the highest point of the ridge.
- Patent Document 1 proposes a method for manufacturing a polished object to be polished, which is intended to reduce the height of the laser mark.
- Patent Document 2 proposes a polishing composition intended to reduce the unevenness of protrusions generated on the peripheral edge of a hard laser mark, and a method for polishing a silicon substrate using the polishing composition.
- Patent Document 3 proposes a polishing method intended to eliminate the ridge on the periphery of the hard laser mark.
- the method for producing a polished object described in Patent Document 1 has a laser mark height of 30 nm or less, and a two-step polishing step is performed using two types of polishing compositions. It was necessary and there was room for improvement in properly eliminating the uplift around the laser mark. Further, the polishing composition described in Patent Document 2 and the method for polishing a silicon substrate using the polishing composition reduce the protrusions generated on the peripheral edge of the hard laser mark to about 20 nm to 30 nm. , There was room for improvement in properly eliminating the uplift around the laser mark.
- the polishing method described in Patent Document 3 has a laser mark height of 50 nm or less, and requires a two-step polishing step using two types of polishing slurries, and the peripheral edge of the laser mark is raised. There was room for improvement in that it was properly resolved.
- the present invention provides a polishing composition that provides a flat polishing surface for the purpose of eliminating the bulge around the laser mark in the wafer polishing process, and a wafer polishing method using the polishing composition.
- the present inventors have found that the raised portion around the laser mark has higher wettability than other portions, so that the polishing component efficiently contacts the raised portion and is polished.
- the polishing component it is necessary to balance the hydrophilicity and hydrophobicity of the polishing component in order to flatten the raised part, and in order for the polishing particles in the polishing component to efficiently contact the raised part of the laser mark, the polishing particles It was thought that it was necessary to make the water more hydrophilic.
- compositions having a specific amount of a dissolved silica component for silica particles as abrasive grains and a tetraalkylammonium ion as a cationic component for imparting alkalinity can efficiently polish the raised portion of the laser mark, and the present invention has been found. Has been completed.
- the present invention is, as a first aspect, a polishing composition containing silica particles and water, and the polishing composition further adds tetraalkylammonium ions to SiO 2 of the silica particles to 0.400 to 1. .500: wherein at a mass ratio of SiO 2 dissolved in the polishing composition relative to the SiO 2 of the silica particles, 0.100 to 1.500: characterized in that it comprises at a mass ratio, Regarding the composition for polishing.
- the tetraalkylammonium ion is derived from a compound selected from the group consisting of alkali silicates, hydroxides, carbonates, sulfates and halides, and is 0.2 in the polishing composition.
- the polishing composition according to the first aspect which is contained in a proportion of% by mass to 8.0% by mass.
- the dissolved SiO 2 is derived from tetraalkylammonium silicate, potassium silicate, sodium silicate, or a mixture thereof, and is 0.1% by mass to 8.0 in the polishing composition.
- the polishing composition according to the first aspect which is contained in a proportion of% by mass.
- the tetraalkylammonium ion is tetramethylammonium ion, tetraethylammonium ion, tetrapropylammonium ion, tetrabutylammonium ion, ethyltrimethylammonium ion, diethyldimethylammonium ion, methyltriethylammonium ion, or a mixture thereof.
- the polishing composition according to any one of the first aspect to the fourth aspect.
- any of the first to fifth aspects wherein the silica particles have an average primary particle size of 1 nm to 100 nm and the silica concentration based on the silica particles is 0.1% by mass to 30% by mass.
- the polishing composition relates to the polishing composition according to any one of the first to sixth aspects, wherein the polishing composition has a pH of 11 to 13.
- the eighth aspect relates to the polishing composition according to any one of the first aspect to the seventh aspect, which is used for eliminating the laser mark of the silicon wafer.
- the present invention relates to a method for eliminating a laser mark on a silicon wafer by using the polishing composition according to any one of the first aspect to the eighth aspect.
- the aqueous silica sol is mixed with tetraalkylammonium hydroxide, potassium hydroxide, sodium hydroxide, or a mixture thereof, and heated at 40 ° C. to 100 ° C. for 0.5 to 20 hours.
- the method for producing a polishing composition according to any one of the first to eighth aspects which comprises a step of producing an alkali silicate and producing a dissolved SiO 2 derived from the alkali silicate.
- the polishing composition according to any one of the first to eighth aspects which comprises a step of mixing the aqueous silica sol with tetraalkylammonium silicate, potassium silicate, sodium silicate, or a mixture thereof.
- the polishing composition according to any one of the first to eighth aspects is diluted with water before or during polishing of the material to be polished to reduce the silica concentration based on the silica particles to 0.
- the method for producing a polishing composition A thirteenth aspect relates to a method for polishing a silicon wafer using the polishing composition produced by the method according to the twelfth aspect.
- the polishing composition of the present invention has the effect of eliminating the bulge around the laser mark and giving a flat polishing surface when polishing is performed using the polishing composition in the polishing process of the wafer.
- the present invention is a polishing composition containing silica particles and water, and the polishing composition further contains tetraalkylammonium ions in a mass ratio of 0.400 to 1.500: 1 with respect to SiO 2 of the silica particles. wherein in the SiO 2 dissolved in the polishing composition relative to the SiO 2 of the silica particles, 0.100 to 1.500: characterized in that it comprises at a mass ratio, a polishing composition.
- silica particles contained in the polishing composition of the present invention silica particles made of an aqueous dispersion of silica particles having an average primary particle size of 1 nm to 100 nm can be used.
- These aqueous dispersions are silica sol, the silica in the silica sol is the silica particles in the polishing composition of the present invention, and the aqueous medium in the silica sol can be replaced with water in the polishing composition.
- the water in the polishing composition is due to the water in the silica sol, but more water can be added to dilute the polishing composition.
- the silica particles used in the present invention are colloidal silica having an average primary particle size of 1 nm to 100 nm, which is obtained by the nitrogen adsorption method. If the average primary particle size is smaller than 1 nm, the polishing rate is low, and the silica particles are likely to aggregate, resulting in low stability of the polishing composition. If the average primary particle size is larger than 100 nm, scratches are likely to occur on the wafer surface, and the flatness of the polished surface deteriorates.
- the silica sol in which the silica particles are dispersed in an aqueous medium contains coarse particles of 0.5 ⁇ m or more, it is preferable to remove the coarse particles.
- a forced sedimentation method or a microfiltration method can be used to remove the coarse particles.
- the filter used for microfiltration include a depth filter, a pleated filter, a membrane filter, a hollow fiber filter, and the like, and any of them can be used.
- the filter material include cotton, polypropylene, polystyrene, polysulfone, polyethersulfone, nylon, cellulose, glass and the like, and any of them can be used.
- the filtration accuracy of the filter is expressed by the absolute filtration accuracy (size of particles supplemented by 99.9% or more), but in the case of the silica particles, from the viewpoint of production efficiency (processing time, degree of clogging of the filter, etc.). Therefore, it is preferable to treat with a filter having an absolute filtration accuracy of 0.5 ⁇ m to 1.0 ⁇ m.
- the pH of the silica sol can be adjusted with ammonia or the like, and a polymer, a chelating agent or the like can be added to the silica sol.
- the pH adjustment of the silica sol can be performed before, after, or both of the addition of the compound (polymer) or chelating agent.
- the pH of the polishing composition of the present invention can be set in the range of 11 to 13, or 11 to 12. It is preferable to set the pH to the above level before polishing.
- the alkaline components for setting these pHs are sodium hydroxide, potassium hydroxide, ammonia, primary ammonium hydroxide, secondary ammonium hydroxide, tertiary ammonium hydroxide, and quaternary ammonium hydroxide (eg,). , Tetraalkylammonium hydroxide, etc.), organic amines, alkali metal carbonates and the like can be used.
- tetraalkylammonium hydroxide examples include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, ethyltrimethylammonium hydroxide, diethyldimethylammonium hydroxide and methyltriethylammonium hydroxide. Can be mentioned. In particular, it is preferable to use tetramethylammonium hydroxide.
- the polishing composition of the present invention may include a tetraalkylammonium ion, a SiO 2 dissolved in the polishing composition, SiO 2 dissolved with them tetraalkylammonium ions constituting the alkali silicate.
- the tetraalkylammonium ion contained in the polishing composition of the present invention includes tetramethylammonium ion, tetraethylammonium ion, tetrapropylammonium ion, tetrabutylammonium ion, ethyltrimethylammonium ion, diethyldimethylammonium ion, methyltriethylammonium ion, or It is a mixture of them.
- the tetraalkylammonium ion is derived from a compound selected from the group consisting of alkali silicates, hydroxides, carbonates and halides.
- the polishing composition of the present invention can contain tetraalkylammonium ions in the polishing composition in a proportion of 0.2% by mass to 8.0% by mass.
- Dissolved SiO 2 (hereinafter, also referred to as dissolved silica, dissolved SiO 2 , dissolved silica, etc.) is a silica component dissolved in an aqueous medium of a polishing composition having no particle property, and the polishing composition is centrifuged. Silica particles and dissolved SiO 2 can be separated by filtration. Since it is difficult to confirm the dissolved SiO 2 by observation with a transmission electron microscope, it is considered that the dissolved SiO 2 does not have particle properties, or the average primary particle size is less than 1 nm even in the presence of oligomers and the like.
- the dissolved SiO 2 is silica or silicate anion having an average primary particle size of less than 1 nm, and the silicate anion is a silicate ion monomer, such as a silicate ion dimer or a colloidal silicate ion micelle. Is. All of these are dissolved in the polishing composition. Then, the dissolved SiO 2 can exist as a silicate anion.
- the oligomeric silica and the silicate anion constituting these dissolved SiO 2 can contain a cation as a counter ion.
- the dissolved SiO 2 present together with the silica particles preferably has a cation that imparts a certain amount of alkalinity, and the dissolved SiO 2 and the alkaline cation form an alkali silicate.
- silica abrasive grains (silica particles) and water are derived from an aqueous silica sol, and the polishing composition of the present invention can be produced by adding an alkali silicate to the aqueous silica sol.
- the cation contained in the polishing composition can be the total amount of the cation derived from alkali silicate and the cation derived from hydroxide or carbonate.
- the dissolved SiO 2 is derived from an alkali silicate containing tetraalkylammonium silicate, potassium silicate, sodium silicate, or a mixture thereof.
- a part of silica particles as abrasive grains may be dissolved.
- dissolved SiO 2 can be contained in the polishing composition in a proportion of 0.1% by mass to 8.0% by mass.
- tetraalkylammonium silicate can be preferably used.
- the ratio of tetraalkylammonium to other silicates can be in the range of 1: 0 to 0.8, or 1: 0 to 0.5, or 1: 0 to 0.35.
- the polishing composition of the present invention can be produced by mixing an aqueous silica sol and an alkaline silicate. If necessary, hydroxides, carbonates, sulfates, halides and the like can be added.
- alkali silicate for example, tetraalkylammonium silicate, potassium silicate, sodium silicate, or a mixture thereof can be used.
- hydroxide examples include tetraalkylammonium hydroxide, potassium hydroxide and sodium hydroxide.
- Examples of the carbonate include tetraalkylammonium carbonate, potassium carbonate and sodium carbonate.
- sulfate examples include tetraalkylammonium sulfate, potassium sulfate and sodium sulfate.
- halide examples include tetraalkylammonium chloride, tetraalkylammonium bromide, potassium chloride, potassium bromide, sodium chloride and sodium bromide.
- the alkali silicate is produced by mixing an aqueous silica sol with tetraalkylammonium hydroxide, potassium hydroxide, sodium hydroxide, or a mixture thereof and heating at 40 ° C to 100 ° C for 0.5 to 20 hours. can do.
- the polishing composition of the present invention is obtained through the steps of producing these alkaline silicates.
- Tetraalkylammonium silicate has a silica concentration of 5.0% by mass to 50% by mass and an alkali content (Na content) of 0.0001% by mass to 0.5000% by mass, for example, using tetramethylammonium silicate as an example. It can be produced by heating an aqueous silica sol and an aqueous solution of tetramethylammonium hydroxide having a concentration of 5.0% by mass to 25% by mass at 60 ° C. to 100 ° C. for 2 hours to 10 hours. The above heating can be performed under stirring using a stirring device such as a disper.
- a stirring device such as a disper.
- the resulting tetraalkylammonium silicate can be produced at a molar ratio of 2 to 4, typically 3.0, in terms of SiO 2 / M 2 O.
- the above M represents tetramethylammonium ion, tetraethylammonium ion, tetrapropylammonium ion, or tetrabutylammonium ion, ethyltrimethylammonium ion, diethyldimethylammonium ion, or methyltriethylammonium ion.
- the SiO 2 concentration is 1.0% by mass to 20% by mass, typically 10% by mass
- the tetraalkylammonium hydroxide concentration is 1.0% by mass to 20% by mass, typically 10% by mass.
- the solid content is 2.0% by mass to 40% by mass, typically 20% by mass.
- the alkali metal silicate is, for example, an aqueous silica sol having a silica concentration of 5.0% by mass to 50% by mass and an alkali content (Na content) of 0.0001% by mass to 0.5000% by mass, taking potassium silicate as an example.
- a potassium hydroxide aqueous solution having a concentration of 2.0% by mass to 48% by mass can be produced by heating at 60 ° C. to 100 ° C. for 2 hours to 10 hours. In the above heating, before adding the potassium hydroxide aqueous solution, the aqueous silica sol is heated at 40 ° C. to 50 ° C.
- the potassium hydroxide aqueous solution is added to the aqueous silica sol at that temperature.
- it can be produced by heating at a temperature of 90 ° C. to 100 ° C. for 2 hours to 10 hours.
- the above heating can be performed under stirring using a stirring device such as a disper.
- the resulting alkali metal silicate can be produced at a molar ratio of 2 to 5, typically 3.85, in terms of SiO 2 / M 2 O.
- the above M represents potassium ion or sodium ion.
- the SiO 2 concentration is 2.0% by mass to 30% by mass, typically 20% by mass, and the potassium hydroxide concentration is 1.0% by mass to 30% by mass, typically 9.7% by mass. ..
- the solid content is 3.0% by mass to 60% by mass, typically 30% by mass.
- the silica particles are silica particles derived from an aqueous silica sol, and an abrasive liquid can be prepared by optionally adding an alkaline component, a water-soluble compound, and a chelating agent to the silica sol.
- any water-soluble compound can be used as the water-soluble compound.
- hydroxyethyl cellulose, glycerin, polyglycerin, polyvinyl alcohol, or carboxyl group or sulfonic acid group modified polyvinyl alcohol can be used. It can be contained in a proportion of 0.005% by mass to 1.0% by mass with respect to the polishing composition of the present invention.
- a chelating agent can be added to the polishing composition of the present invention.
- the chelating agent include an aminocarboxylic acid-based chelating agent and a phosphonic acid-based chelating agent.
- the aminocarboxylic acid-based chelating agent include ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, hydroxyethylethylenediaminetriacetic acid, triethylenetetraminehexacetic acid, 1,3-propanediaminetetraacetic acid, and 1,3-diamine-2.
- phosphonic acid-based chelating agent examples include hydroxyethylidene diphosphonic acid, nitrilotris (methylenephosphonic acid), phosphonobutanetricarboxylic acid, and ethylenediaminetetra (methylenephosphonic acid).
- the chelating agent can be contained in a proportion of 0.005% by mass to 1.0% by mass with respect to the polishing composition of the present invention.
- wafers to which the wafer polishing composition of the present invention can be applied include silicon wafers, SiC wafers, GaN wafers, GaAs wafers, GaP wafers, glass wafers, aluminum wafers and sapphire wafers.
- polishing liquid composition for a wafer of the present invention can be used in any of the devices.
- polishing composition of the present invention By polishing using the polishing composition of the present invention, it is possible to manufacture a wafer that gives a flat polished surface having a small height difference between the central portion and the peripheral portion (laser mark portion) of the wafer in the polishing process of the wafer. ..
- the polishing composition of the present invention can be used to polish the ridges around the laser mark on the laser-marked wafer.
- the step of polishing the ridge around the laser mark of the wafer with the laser mark using the polishing composition of the present invention can be performed. it can.
- the ridge around the laser mark having a height of 50 nm to 500 nm or 50 nm to 200 nm with respect to the horizontal plane can be polished to 30 nm to -10 nm, preferably 25 nm to 0 nm, and more preferably 0 nm.
- the reason why the peripheral portion of the laser mark after polishing is about -10 nm is that the peripheral portion of the laser mark may be lowered to about -10 nm toward the recess of the laser mark portion due to polishing. They have a polished edge of the recess and show a negative value, ideally 0 nm.
- the obtained TMA silicate had a molar ratio of 3.0 (M is tetramethylammonium) converted in SiO 2 / M 2 O, a SiO 2 concentration of 10% by mass, and a tetraalkylammonium hydroxide concentration of 10% by mass.
- the solid content was 20% by mass.
- the obtained K silicate has a molar ratio of 3.85 (K is potassium) converted into SiO 2 / M 2 O, a SiO 2 concentration of 20% by mass, a potassium hydroxide concentration of 9.7% by mass, and a solid content. Was 30% by mass.
- polishing composition Colloidal silica (silica abrasive grains, manufactured by Nissan Chemical Co., Ltd., trade name Snowtex, silica particles based on silica sol) having an average primary particle diameter of 45 nm, which is obtained from the nitrogen adsorption method (BET method), and alkali silicate (above).
- BET method nitrogen adsorption method
- alkali silicate above
- TMA silicate of Synthesis Example 1 and the K silicate of Synthesis Example 2 above hydroxides, carbonates, chelating agents (tetrasodium ethylenediamine tetraacetate), and glycerin in the proportions shown below, and the rest is water.
- a polishing composition was produced.
- Ethylenediaminetetraacetic acid was contained in Examples 1 to 8 and Comparative Examples 1 to 3 in an amount of 0.2% by mass, and glycerin was contained in Examples 1 to 8 and Comparative Examples 1 to 3. Contained 0.3% by mass.
- TMA indicates tetramethylammonium ion
- TMAH indicates tetramethylammonium hydroxide
- TMAS indicates tetramethylammonium silicate
- TMAC indicates tetramethylammonium carbonate
- KS indicates potassium silicate
- KC indicates potassium carbonate. ..
- the carbonate functions as a pH buffer.
- the hydroxide functions as a pH adjuster.
- polishing compositions of Examples 1 to 8 and Comparative Examples 1 to 3 are diluted 10-fold with pure water (that is, the concentration of SiO 2 abrasive grains in the polishing composition is 0.8 mass by mass). %) And used in the following polishing test.
- polishing machine As a polishing machine, a double-sided polishing machine (trade name 13BF) manufactured by Hamai Co., Ltd. was used. The surface plate size was 933.4 mm in outer diameter and 349.4 mm in inner diameter.
- the wafer to be polished was a silicon wafer, having a diameter of 200 mm, a conduction type P type, a crystal orientation of Miller index ⁇ 100>, and a resistivity of 100 ⁇ ⁇ cm or less. As for the number of polished wafers, one silicon wafer was set on the carrier, and three sets of three wafers were polished at the same time.
- the polishing pad was manufactured by JH RHODES Co., Ltd., trade name was LP-57, the groove width was 2 mm, and the groove pitch was 20 mm.
- the polishing load was 150 g / cm 2 .
- the lower surface plate rotation speed was 20 rpm, the upper surface plate rotation speed was 6.6 rpm, and the rotation ratio was 3.0.
- the polishing time was 60 minutes per batch, and 3 batches were polished with the same polishing pad.
- the amount of polishing liquid was 25 liters, and the polishing liquid was supplied at 6.4 liters / minute, and no new polishing liquid was replenished on the way.
- the temperature of the polishing liquid at the time of polishing was 23 ° C to 25 ° C.
- the polishing rate indicates the average polishing rate ( ⁇ m / min) of 3 batches
- the laser mark resolvability indicates the laser mark height of the 3rd batch (height from the silicon wafer (nm))
- the pH is The initial pH and the pH for each batch are listed.
- the laser mark height is measured by using the optical interference microscope system BW-M7000 manufactured by Nikon Instec Co., Ltd., and the highest part of the wafer surface with respect to the roughness curve obtained by scanning a constant width (500 ⁇ m). And the difference in height of the lowest part was measured.
- the polishing composition of the present invention components other than silica particles and water play a large role, and by containing a specific amount of tetraalkylammonium ion and a specific amount of dissolved silica, excellent laser mark elimination property is exhibited. I found out. It is considered that this is because the dissolved silica component is contained together with the silica abrasive grains.
- the abrasive particles are silica particles, and it is natural that the silanol group of the silica particles themselves contributes to hydrophilicity, but the presence of the silica component dissolved together with the silica particles makes the silica particles as abrasive grains hydrophilic.
- the raised portion is efficiently contacted with the raised portion around the laser mark to flatten the raised portion.
- the silica abrasive grains in the polishing composition are dissolved in the polishing composition by the alkaline component to achieve a dissolution equilibrium, but by containing the alkali silicate, the silica component dissolved from the beginning is contained, so that the polishing is performed. Since it is possible to prevent the dissolution of silica abrasive grains in the composition and prevent the dissolution of silica abrasive grains while maintaining a high pH during the entire polishing process, the silica particles (silica abrasive grains) effectively mark the laser mark.
- polishing composition of the present invention it is possible to eliminate the bulge around the laser mark in the polishing process of the wafer and give a flat polishing surface.
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Abstract
Description
特許文献2には、ハードレーザーマークの周縁部に生成する突起の凹凸を低減することを意図した研磨用組成物及び当該研磨用組成物を用いたシリコン基板の研磨方法が提案されている。
特許文献3には、ハードレーザーマーク周縁の隆起の解消を意図した研磨方法が提案されている。
また、特許文献2に記載の研磨用組成物及び当該研磨用組成物を用いたシリコン基板の研磨方法は、ハードレーザーマークの周縁部に生成する突起を20nm乃至30nm程度に低減するものであって、レーザーマーク周縁の隆起を適切に解消する点で改善の余地があった。
また、特許文献3に記載の研磨方法は、レーザーマーク高さを50nm以下にするものであって、かつ二種の研磨スラリーを用いて二段階の研磨工程を必要としており、レーザーマーク周縁の隆起を適切に解消する点で改善の余地があった。
第2観点として、前記テトラアルキルアンモニウムイオンがアルカリシリケート、水酸化物、炭酸塩、硫酸塩及びハロゲン化物からなる群から選ばれる化合物に由来するものであり、前記研磨用組成物中に0.2質量%乃至8.0質量%の割合で含まれる、第1観点に記載の研磨用組成物に関する。
第3観点として、前記溶解したSiO2が、テトラアルキルアンモニウムシリケート、カリウムシリケート、ナトリウムシリケート、又はそれらの混合物に由来するものであり、前記研磨用組成物中に0.1質量%乃至8.0質量%の割合で含まれる、第1観点に記載の研磨用組成物に関する。
第4観点として、前記溶解したSiO2が1nm未満の平均一次粒子径を有するシリカ、又はケイ酸アニオンである第1観点乃至第3観点のいずれか一つに記載の研磨用組成物に関する。
第5観点として、前記テトラアルキルアンモニウムイオンが、テトラメチルアンモニウムイオン、テトラエチルアンモニウムイオン、テトラプロピルアンモニウムイオン、テトラブチルアンモニウムイオン、エチルトリメチルアンモニウムイオン、ジエチルジメチルアンモニウムイオン、メチルトリエチルアンモニウムイオン、又はそれらの混合物である、第1観点乃至第4観点のいずれか一つに記載の研磨用組成物に関する。
第6観点として、前記シリカ粒子が1nm乃至100nmの平均一次粒子径を有し、且つシリカ粒子に基づくシリカ濃度が0.1質量%乃至30質量%である、第1観点乃至第5観点のいずれか一つに記載の研磨用組成物に関する。
第7観点として、前記研磨用組成物は、そのpHが11乃至13である、第1観点乃至第6観点のいずれか一つに記載の研磨用組成物に関する。
第8観点として、シリコンウエハーのレーザーマークの解消のために用いる、第1観点乃至第7観点のいずれか一つに記載の研磨用組成物に関する。
第9観点として、第1観点乃至第8観点のいずれか一つに記載の研磨用組成物を用いて、シリコンウエハーのレーザーマークを解消する方法に関する。
第10観点として、水性シリカゾルと、水酸化テトラアルキルアンモニウム、水酸化カリウム、水酸化ナトリウム、又はそれらの混合物とを混合し、40℃乃至100℃で、0.5時間乃至20時間の加熱を行い、アルカリシリケートを製造し、当該アルカリシリケート由来の溶解したSiO2を生成する工程を含む、第1観点乃至第8観点のいずれか一つに記載の研磨用組成物の製造方法に関する。
第11観点として、水性シリカゾルと、テトラアルキルアンモニウムシリケート、カリウムシリケート、ナトリウムシリケート、又はそれらの混合物とを混合する工程を含む、第1観点乃至第8観点のいずれか一つに記載の研磨用組成物の製造方法に関する。
第12観点として、第1観点乃至第8観点のいずれか一つに記載の研磨用組成物を、被研磨材料の研磨前又は研磨中に水で希釈して、シリカ粒子に基づくシリカ濃度を0.1質量%乃至4.0質量%、テトラアルキルアンモニウムイオンを0.2質量%乃至4.0質量%、溶解したSiO2を0.1質量%乃至2.0質量%に調製する工程を含む、研磨用組成物の製造方法に関する。
第13観点として、第12観点に記載の方法で製造された研磨用組成物を用いるシリコンウエハーの研磨方法に関する。
これらのpHに設定するためのアルカリ成分は水酸化ナトリウム、水酸化カリウム、アンモニア、水酸化第1級アンモニウム、水酸化第2級アンモニウム、水酸化第3級アンモニウム、水酸化第4級アンモニウム(例えば、水酸化テトラアルキルアンモニウムが挙げられる。)、有機アミン及びアルカリ金属炭酸塩等の水溶液を用いることができる。特に水酸化ナトリウム、水酸化カリウム水溶液、水酸化テトラアルキルアンモニウム水溶液を用いることが好ましい。
水酸化テトラアルキルアンモニウムとしては、例えば、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、水酸化テトラプロピルアンモニウム、水酸化テトラブチルアンモニウム、水酸化エチルトリメチルアンモニウム、水酸化ジエチルジメチルアンモニウム及び水酸化メチルトリエチルアンモニウムが挙げられる。特に、水酸化テトラメチルアンモニウムを用いることが好ましい。
上記テトラアルキルアンモニウムイオンはアルカリシリケート、水酸化物、炭酸塩及びハロゲン化物からなる群から選ばれる化合物に由来するものである。本発明の研磨用組成物は、テトラアルキルアンモニウムイオンを研磨用組成物中に0.2質量%乃至8.0質量%の割合で含むことができる。
そして、溶解したSiO2はケイ酸アニオンして存在することができる。
これらの溶解したSiO2を構成するオリゴマー状シリカや、ケイ酸アニオンは、対イオンとしてカチオンを含有することができる。
シリカ粒子と共に存在する溶解したSiO2は、ある一定量のアルカリ性を付与するカチオンが存在することが好ましく、溶解したSiO2とアルカリ性カチオンとにより、アルカリシリケートとなる。本発明では、シリカ砥粒(シリカ粒子)と水は水性シリカゾルに由来するものであり、水性シリカゾルにアルカリシリケートを添加することにより本発明の研磨用組成物を製造することができる。
また、研磨用組成物に含まれるカチオンは、アルカリシリケートに由来するカチオンと、水酸化物や炭酸塩に由来するカチオンの合計量とすることができる。
テトラアルキルアンモニウムイオンと溶解したSiO2は、砥粒としてのシリカ粒子に対して質量比で、(テトラアルキルアンモニウムイオン)/(SiO2粒子)=0.400~1.500、(溶解SiO2)/(SiO2粒子)=0.100~1.500の割合で含んでいることが、シリコンウェハーのレーザーマークの解消のために用いる研磨用組成物の研磨特性として好ましい。
上記シリカ粒子は水性シリカゾルに由来するシリカ粒子であり、シリカゾルに任意にアルカリ成分、水溶性化合物、及びキレート剤を添加することにより研磨液を作成することができる。
アミノカルボン酸系キレート剤としては、例えば、エチレンジアミンテトラ酢酸、ニトリロトリ酢酸、ジエチレントリアミンペンタ酢酸、ヒドロキシエチルエチレンジアミントリ酢酸、トリエチレンテトラミンヘキサ酢酸、1,3-プロパンジアミンテトラ酢酸、1,3-ジアミン-2-ヒドロキシプロパンテトラ酢酸、ヒドロキシエチルイミノジ酢酸、ジヒドロキシエチルグリシン、グリコールエーテルジアミンテトラ酢酸、ジカルボキシメチルグルタミン酸、及びエチレンジアミン-N,N’-ジコハク酸を挙げることができる。
ホスホン酸系キレート剤としては、例えば、ヒドロキシエチリデンジホスホン酸、ニトリロトリス(メチレンホスホン酸)、ホスホノブタントリカルボン酸、及びエチレンジアミンテトラ(メチレンホスホン酸)を挙げることができる。
本発明の研磨用組成物に対してキレート剤は、0.005質量%乃至1.0質量%の割合で含有することができる。
本発明ではレーザーマークが付されたウェハーを予備研摩する工程を経て、本発明の研摩用組成物を用いてレーザーマークが付されたウェハーのレーザーマーク周辺部の隆起を研磨する工程を行うことができる。
シリカ濃度35質量%のシリカゾルを陽イオン交換樹脂(オルガノ社製アンバーライトIR-120B)を用いイオン交換し、得られた酸性のシリカゾル2,940g(アルカリ含有量0.03質量%)に、イオン交換水3,060gを加えた後、更に25%水酸化テトラメチルアンモニウム4,000gを撹拌下に添加した。この溶液を撹拌しながら80℃まで昇温し、6時間保持することで、所望のTMAシリケート溶液を得た。
得られたTMAシリケートは、SiO2/M2Oで換算されるモル比が3.0(Mはテトラメチルアンモニウム)、SiO2濃度は10質量%、水酸化テトラアルキルアンモニウム濃度は10質量%、固形分は20質量%であった。
シリカ濃度35質量%のシリカゾルを陽イオン交換樹脂(オルガノ社製アンバーライトIR-120B)を用いイオン交換し、得られた酸性のシリカゾル5,880g(アルカリ含有量0.03質量%)に、イオン交換水2,100gを加えた後、撹拌しながら43℃まで昇温した。昇温後、48%水酸化カリウム2,020gを撹拌下に添加し、この溶液を撹拌しながら96℃まで昇温後、6時間保持することで所望のKシリケート溶液を得た。
得られたKシリケートは、SiO2/M2Oで換算されるモル比が3.85(Kはカリウム)、SiO2濃度は20質量%、水酸化カリウム濃度は9.7質量%、固形分は30質量%であった。
窒素吸着法(BET法)から求められる平均一次粒子径45nmのコロイダルシリカ(シリカ砥粒、日産化学(株)製、商品名スノーテックス、シリカゾルに基づくシリカ粒子である。)と、アルカリシリケート(上記合成例1のTMAシリケート、上記合成例2のKシリケートを使用)と、水酸化物、炭酸塩、キレート剤(エチレンジアミン四酢酸四ナトリウム塩)、グリセリンを下記に示す割合に添加し、残部は水となる研磨用組成物を製造した。
なお、エチレンジアミン四酢酸は実施例1乃至実施例8、及び比較例1乃至比較例3に0.2質量%を含有し、グリセリンは実施例1乃至実施例8、及び比較例1乃至比較例3に0.3質量%を含有した。
得られた研磨用組成物中のシリカゾルに基づくシリカ粒子としてのSiO2質量%、溶解しているシリカ成分としてのSiO2質量%、カチオンの含有量(質量%)を示した。
TMAはテトラメチルアンモニウムイオンを示し、TMAHは水酸化テトラメチルアンモニウムを示し、TMASはテトラメチルアンモニウムシリケートを示し、TMACは炭酸テトラメチルアンモニウムを示し、KSはカリウムシリケートを示し、KCは炭酸カリウムを示す。
上記炭酸塩はpH緩衝剤として機能するものである。上記水酸化物はpH調整剤として機能するものである。
研磨機として、浜井産業(株)製の両面研磨機(商品名13BF)を用いた。
定盤サイズは外径933.4mm、内径349.4mmであった。
被研磨ウェハーはシリコンウエハーであり、直径200mm、伝導型P型、結晶方位はミラー指数〈100〉、抵抗率は100Ω・cm以下であった。
研磨枚数はキャリアにシリコンウエハーを1枚セットし、3セットの計3枚を同時に研磨した。
研磨パッドはJH RHODES(株)社製、商品名LP-57、溝幅は2mm、溝ピッチは20mmであった。
研磨荷重は150g/cm2であった。
下定盤回転数は20rpm、上定盤回転数は6.6rpm、回転比率は3.0であった。
研磨時間は1バッチあたり60分間であり、同一研磨パッドで3バッチの研磨を行った。
研磨液量は25リットルであり、6.4リットル/分で研磨液を供給し、途中での新規な研磨液の補充は行わなかった。
研磨時の研磨液の液温は23℃乃至25℃であった。
表3中、研磨速度は3バッチの平均研磨速度(μm/分)を示し、レーザーマーク解消性は3バッチ目のレーザーマーク高さを示し(シリコンウエハーからの高さ(nm))、pHは当初pHと、各バッチ毎のpHを記載した。
レーザーマーク高さの測定方法は、(株)ニコンインステック社製光干渉顕微鏡システムBW-M7000を用い、一定幅(500μm)をスキャンして得られる粗さ曲線に対し、ウェハー表面の最も高い部分と最も低い部分の高さの差分を測定した。
一方、研磨当初に溶解したシリカ成分を含有しない比較例1と比較例3では、上述の効果が発揮できず、また比較例2では、溶解したシリカ成分を含有するがテトラメチルアンモニウムイオンが特定量含有していないため、高いpHを維持することができないと考えられる。
Claims (13)
- シリカ粒子と水とを含む研磨用組成物であって、該研磨用組成物はさらにテトラアルキルアンモニウムイオンをシリカ粒子のSiO2に対して0.400乃至1.500:1の質量比で含み、該研磨用組成物に溶解したSiO2をシリカ粒子のSiO2に対して、0.100乃至1.500:1の質量比で含むことを特徴とする、研磨用組成物。
- 前記テトラアルキルアンモニウムイオンがアルカリシリケート、水酸化物、炭酸塩、硫酸塩及びハロゲン化物からなる群から選ばれる化合物に由来するものであり、前記研磨用組成物中に0.2質量%乃至8.0質量%の割合で含まれる、請求項1に記載の研磨用組成物。
- 前記溶解したSiO2が、テトラアルキルアンモニウムシリケート、カリウムシリケート、ナトリウムシリケート、又はそれらの混合物に由来するものであり、前記研磨用組成物中に0.1質量%乃至8.0質量%の割合で含まれる、請求項1に記載の研磨用組成物。
- 前記溶解したSiO2が1nm未満の平均一次粒子径を有するシリカ、又はケイ酸アニオンである請求項1乃至請求項3のいずれか1項に記載の研磨用組成物。
- 前記テトラアルキルアンモニウムイオンが、テトラメチルアンモニウムイオン、テトラエチルアンモニウムイオン、テトラプロピルアンモニウムイオン、テトラブチルアンモニウムイオン、エチルトリメチルアンモニウムイオン、ジエチルジメチルアンモニウムイオン、メチルトリエチルアンモニウムイオン、又はそれらの混合物である、請求項1乃至請求項4のいずれか1項に記載の研磨用組成物。
- 前記シリカ粒子が1nm乃至100nmの平均一次粒子径を有し、且つシリカ粒子に基づくシリカ濃度が0.1質量%乃至30質量%である、請求項1乃至請求項5のいずれか1項に記載の研磨用組成物。
- 前記研磨用組成物は、そのpHが11乃至13である、請求項1乃至請求項6のいずれか1項に記載の研磨用組成物。
- シリコンウエハーのレーザーマークの解消のために用いる、請求項1乃至請求項7のいずれか1項に記載の研磨用組成物。
- 請求項1乃至請求項8のいずれか1項に記載の研磨用組成物を用いて、シリコンウエハーのレーザーマークを解消する方法。
- 水性シリカゾルと、水酸化テトラアルキルアンモニウム、水酸化カリウム、水酸化ナトリウム、又はそれらの混合物とを混合し、40℃乃至100℃で、0.5時間乃至20時間の加熱を行い、アルカリシリケートを製造し、当該アルカリシリケート由来の溶解したSiO2を生成する工程を含む、請求項1乃至請求項8のいずれか1項に記載の研磨用組成物の製造方法。
- 水性シリカゾルと、テトラアルキルアンモニウムシリケート、カリウムシリケート、ナトリウムシリケート、又はそれらの混合物とを混合する工程を含む、請求項1乃至請求項8のいずれか1項に記載の研磨用組成物の製造方法。
- 請求項1乃至請求項8のいずれか1項に記載の研磨用組成物を、被研磨材料の研磨前又は研磨中に水で希釈して、シリカ粒子に基づくシリカ濃度を0.1質量%乃至4.0質量%、テトラアルキルアンモニウムイオンを0.2質量%乃至4.0質量%、溶解したSiO2を0.1質量%乃至2.0質量%に調製する工程を含む、研磨用組成物の製造方法。
- 請求項12に記載の方法で製造された研磨用組成物を用いるシリコンウエハーの研磨方法。
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KR20230082689A (ko) | 2021-10-14 | 2023-06-08 | 닛산 가가쿠 가부시키가이샤 | 실리콘웨이퍼의 1차 연마 후에 이용되는 후연마용 조성물 |
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EP3916061A1 (en) | 2021-12-01 |
EP3916061B1 (en) | 2023-07-05 |
CN113423799A (zh) | 2021-09-21 |
US11873420B2 (en) | 2024-01-16 |
SG11202109430PA (en) | 2021-09-29 |
JP6882727B1 (ja) | 2021-06-02 |
MY191198A (en) | 2022-06-07 |
KR102357727B1 (ko) | 2022-02-08 |
JPWO2021065815A1 (ja) | 2021-04-08 |
EP3916061A4 (en) | 2022-06-01 |
KR20210103587A (ko) | 2021-08-23 |
TW202129737A (zh) | 2021-08-01 |
US20220049126A1 (en) | 2022-02-17 |
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