WO2004084287A9 - 半導体研磨スラリー精製用素材、半導体研磨スラリー精製用モジュールおよび半導体研磨スラリーの精製方法 - Google Patents
半導体研磨スラリー精製用素材、半導体研磨スラリー精製用モジュールおよび半導体研磨スラリーの精製方法Info
- Publication number
- WO2004084287A9 WO2004084287A9 PCT/JP2004/003642 JP2004003642W WO2004084287A9 WO 2004084287 A9 WO2004084287 A9 WO 2004084287A9 JP 2004003642 W JP2004003642 W JP 2004003642W WO 2004084287 A9 WO2004084287 A9 WO 2004084287A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polishing slurry
- semiconductor polishing
- slurry
- semiconductor
- metal
- Prior art date
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 264
- 239000002002 slurry Substances 0.000 title claims abstract description 244
- 239000004065 semiconductor Substances 0.000 title claims abstract description 122
- 239000000463 material Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000000746 purification Methods 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 claims abstract description 103
- 239000002184 metal Substances 0.000 claims abstract description 103
- 239000013522 chelant Substances 0.000 claims abstract description 51
- 125000000524 functional group Chemical group 0.000 claims abstract description 42
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims description 108
- 239000002585 base Substances 0.000 claims description 23
- 239000002253 acid Substances 0.000 claims description 19
- 238000007670 refining Methods 0.000 claims description 14
- -1 alkali metal salt Chemical class 0.000 claims description 10
- 150000003863 ammonium salts Chemical class 0.000 claims description 10
- 150000002739 metals Chemical class 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 150000003839 salts Chemical class 0.000 claims description 7
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical class NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 claims description 6
- 235000011007 phosphoric acid Nutrition 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- 238000005342 ion exchange Methods 0.000 claims description 4
- 150000003016 phosphoric acids Chemical class 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 230000009969 flowable effect Effects 0.000 claims 1
- 229920001059 synthetic polymer Polymers 0.000 claims 1
- 150000003577 thiophenes Chemical class 0.000 claims 1
- 239000000758 substrate Substances 0.000 abstract description 10
- 238000011109 contamination Methods 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 32
- 229910021645 metal ion Inorganic materials 0.000 description 32
- 235000012431 wafers Nutrition 0.000 description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 24
- 229910052802 copper Inorganic materials 0.000 description 24
- 239000010949 copper Substances 0.000 description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 16
- TVMUHOAONWHJBV-UHFFFAOYSA-N dehydroglycine Chemical compound OC(=O)C=N TVMUHOAONWHJBV-UHFFFAOYSA-N 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 14
- 239000012535 impurity Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 229910052759 nickel Inorganic materials 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 10
- 229910052721 tungsten Inorganic materials 0.000 description 10
- 239000010937 tungsten Substances 0.000 description 10
- 229920002873 Polyethylenimine Polymers 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 229940068984 polyvinyl alcohol Drugs 0.000 description 8
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 8
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 7
- 239000000084 colloidal system Substances 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 238000011049 filling Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000007517 polishing process Methods 0.000 description 7
- 239000004744 fabric Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- JZTPOMIFAFKKSK-UHFFFAOYSA-N O-phosphonohydroxylamine Chemical compound NOP(O)(O)=O JZTPOMIFAFKKSK-UHFFFAOYSA-N 0.000 description 5
- 239000011324 bead Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229920001429 chelating resin Polymers 0.000 description 3
- SFZULDYEOVSIKM-UHFFFAOYSA-N chembl321317 Chemical compound C1=CC(C(=N)NO)=CC=C1C1=CC=C(C=2C=CC(=CC=2)C(=N)NO)O1 SFZULDYEOVSIKM-UHFFFAOYSA-N 0.000 description 3
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000003456 ion exchange resin Substances 0.000 description 3
- 229920003303 ion-exchange polymer Polymers 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 239000003002 pH adjusting agent Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000011734 sodium Substances 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
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 150000004692 metal hydroxides Chemical class 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 150000003566 thiocarboxylic acids Chemical class 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CHRJZRDFSQHIFI-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;styrene Chemical compound C=CC1=CC=CC=C1.C=CC1=CC=CC=C1C=C CHRJZRDFSQHIFI-UHFFFAOYSA-N 0.000 description 1
- MAEDLSNGVQYGPK-UHFFFAOYSA-N 2,2-diaminoacetic acid Chemical compound NC(N)C(O)=O MAEDLSNGVQYGPK-UHFFFAOYSA-N 0.000 description 1
- SCVJRXQHFJXZFZ-KVQBGUIXSA-N 2-amino-9-[(2r,4s,5r)-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-3h-purine-6-thione Chemical class C1=2NC(N)=NC(=S)C=2N=CN1[C@H]1C[C@H](O)[C@@H](CO)O1 SCVJRXQHFJXZFZ-KVQBGUIXSA-N 0.000 description 1
- NEAQRZUHTPSBBM-UHFFFAOYSA-N 2-hydroxy-3,3-dimethyl-7-nitro-4h-isoquinolin-1-one Chemical compound C1=C([N+]([O-])=O)C=C2C(=O)N(O)C(C)(C)CC2=C1 NEAQRZUHTPSBBM-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- KCQUJORJVXQRST-UHFFFAOYSA-N acetic acid;ethane-1,2-diamine Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.NCCN KCQUJORJVXQRST-UHFFFAOYSA-N 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- ZDXPYRJPNDTMRX-UHFFFAOYSA-N glutamine Natural products OC(=O)C(N)CCC(N)=O ZDXPYRJPNDTMRX-UHFFFAOYSA-N 0.000 description 1
- 229960002449 glycine Drugs 0.000 description 1
- 235000013905 glycine and its sodium salt Nutrition 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 150000002443 hydroxylamines Chemical class 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 125000001841 imino group Chemical group [H]N=* 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 125000000446 sulfanediyl group Chemical group *S* 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 229910021655 trace metal ion Inorganic materials 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- H01L21/04—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
-
- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J45/00—Ion-exchange in which a complex or a chelate is formed; Use of material as complex or chelate forming ion-exchangers; Treatment of material for improving the complex or chelate forming ion-exchange properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J47/00—Ion-exchange processes in general; Apparatus therefor
- B01J47/12—Ion-exchange processes in general; Apparatus therefor characterised by the use of ion-exchange material in the form of ribbons, filaments, fibres or sheets, e.g. membranes
- B01J47/127—Ion-exchange processes in general; Apparatus therefor characterised by the use of ion-exchange material in the form of ribbons, filaments, fibres or sheets, e.g. membranes in the form of filaments or fibres
-
- 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
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
- B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/46—Regeneration of etching compositions
Definitions
- the present invention relates to bright metal ions contained in polishing slurries (semiconductor polishing slurries) used in the semiconductor manufacturing process, such as metals such as iron, aluminum, copper, nickel, zinc, chromium, manganese, and tungsten.
- polishing slurries semiconductor polishing slurries
- metals such as iron, aluminum, copper, nickel, zinc, chromium, manganese, and tungsten.
- the present invention relates to a method for refining a slurry for semiconductor polishing using the method.
- semiconductor manufacturing refers to the basic materials such as glass for LCDs and masks, the process of making manufacturing equipment members, and the processing of these materials to produce elements. It includes at least the device manufacturing process for making turns.
- the semiconductor is polished using slurry for the purpose of flattening the surface of each layer formed on the wafer as well as the wafer which is the base neo. ing.
- a polishing process is an important process that determines the surface roughness of a wafer as a product. This is performed by bringing the surface of the wafer attached to the spindle into contact with the polishing pad on the surface of the rotary table, and rotating the rotary table while supplying the polishing slurry to the contact portion.
- the polishing slurry used in the polishing process is obtained by dispersing an abrasive in a solution, and as the abrasive, colloidal silica, fume donrica, or the like is used.
- an alkaline solution may be used to provide an effect of chemically etching the wafer surface.
- CMP chemical mechanical polishing
- This CMP is basically performed by an apparatus similar to the polishing process of wafer manufacturing described above.
- the abrasive used here include colloidal silica, fumed silica, fumed alumina, precipitated alumina, and ceria.
- an acidic solution is sometimes used to have an effect of chemically etching a metal layer or an interlayer insulating film.
- Slurry for semiconductor polishing contains trace amounts of impurity metal ions, such as iron, aluminum, copper, and nickel, impurity metal colloids, and impurities due to these abrasives and contamination from the polishing apparatus or atmosphere.
- Metal hydroxide may be mixed.
- a slurry for polishing semiconductors containing these impurity metal ions and the like is disclosed.
- Slurry for polishing semiconductors in the CMP process is recycled for the purpose of reducing the cost of polishing materials, reducing the environmental burden by reducing the volume of drainage, or reducing the time required to set various conditions when replacing the polishing slurry. Attempts have been made to use it. However, used semiconductor polishing slurries are thrown away without recycling because of the high biological content of metal layers derived from polishing and tungsten, copper, and aluminum derived from interlayer insulating films. It is a fact.
- the impurity metal compound contained in the semiconductor polishing slurry exists in various forms. This is because semiconductor polishing slurries have different pH values depending on the type. That is, the behavior differs depending on the type of metal, but the impurity metal compound can exist in the form of, for example, ions, colloids, and hydroxides, depending on the pH of the slurry for semiconductor polishing. Therefore, since the impurity metals exist in different forms in the slurry for semiconductor polishing, it is necessary to change the mechanism for removing the impurity metals.
- a method of removing trace metal ions from polishing slurries, purifying them, and reusing them is also being studied.
- a method of capturing and removing metal ions using ion exchange resin is being studied.
- This method has the advantage that metal ions can be removed relatively easily, but since the ion-exchange group is a sulfonic acid group (sulfonyl group) or a carboxylic acid group (potoxyl group), the pH dependence is low. High and absorbs metal ions Since the deposition selectivity is very poor, there is a disadvantage that the removal efficiency of other metal ions to be removed is significantly reduced when metal ions such as sodium ions and metal ions are present.
- Japanese Patent Application Laid-Open No. 9-314446 discloses that a chelating resin is used in order to improve the disadvantages of using such an ion-exchange resin and improve the adsorption selectivity of metal ions. There has been proposed a method for removing heavy metals from a slurry for polishing a semiconductor wafer by using the same.
- the chelate resin is a bead-like or granular form in which a chelate functional group is introduced into a low-polarity, rigid, three-dimensionally crosslinked polymer such as styrene-divinyl benzene and the like.
- a chelate functional group is introduced into a low-polarity, rigid, three-dimensionally crosslinked polymer such as styrene-divinyl benzene and the like.
- the rate of metal ion capture is low because the diffusion rate into the bead-like or granular chelate resin required for selective separation of metal ions is low.
- semiconductor polishing slurries contain high concentrations of abrasives and pH adjusters of several percent, so chelating resins developed for selective separation in general aqueous systems cannot be used for semiconductor polishing. It is extremely difficult to remove very small amounts of ionic metal-colloidal or hydroxide metals from the slurry even if they are to be selectively separated.
- the present invention has been made in view of the above circumstances, and its object is to efficiently purify a slurry for semiconductor polishing by a simple method, for example, to contaminate a semiconductor wafer or the like with metal.
- the present invention has been made in order to solve the above-mentioned problems, and it is possible to efficiently purify a slurry for semiconductor polishing by a simple method without changing the pH and to reduce metal contamination to, for example, semiconductor wafers.
- a material for purifying a slurry for semiconductor polishing according to the present invention is characterized in that a functional group having a metal chelate-forming ability is immobilized on at least the surface of a fiber base material.
- the material for purifying a slurry for semiconductor polishing according to the present invention is characterized in that a functional group having a hydroxyl group and an ion exchange ability or a metal chelate-forming ability is immobilized on at least the surface of the fiber base material.
- the impurity metal present in the semiconductor polishing slurry may exist in various forms.
- the metal exists as an ion
- the exchange group or chelate functional group is capable of adsorbing by forming an ion exchange or chelate with the metal ion, and when the metal is present as a colloid or a hydroxyl group, it is contained in the polymer base material.
- the hydroxyl group present in the metal can be physically adsorbed to the hydroxyl group coordinated or bonded to the metal as the metal colloid or metal hydroxide.
- the polymer substrate forming the material for purifying the semiconductor polishing slurry of the present invention has a fibrous form
- the semiconductor polishing slurry is continuously applied to a column filled with the material for purifying the semiconductor polishing slurry.
- metals that exist as insolubles such as colloid and hydroxide are filtered The effect can be removed.
- the semiconductor polishing slurry of the present invention can be used.
- the slurry purification material it becomes possible to remove the impurity metals by the chelate adsorption, physical adsorption, and filtration effects, respectively.
- the hydroxyl group immobilized on at least the surface of the fibrous base material is desirably an ethylenic hydroxyl group, and the hydroxyl value is 40 mg KOH / g or more. It is desirable to be immobilized on the surface of the fiber base material.
- the fiber substrate having an ethylenic hydroxyl group refers to a fiber substrate having a so-called alcoholic hydroxyl group capable of performing an esterification reaction, an amide reaction, and an acetylation reaction.
- the hydroxyl value is less than 40 mg KOH / g, when the metal in the slurry for semiconductor polishing is in the form of colloid or hydroxide, the physical adsorption performance thereof becomes poor. Even if the hydroxyl value is 1000 mg KOH / g or more, its physical adsorption performance does not improve beyond a certain level.
- examples of the functional group capable of forming a metal chelate immobilized on the fiber base include, for example, aminocarboxylic acids (including aminopolycarboxylic acids), amines, hydroxylamines, phosphoric acids, and thio compounds.
- Preferred groups include.
- iminoacetic acid and aminoacetic acid can be used as the aminocarboxylic acids
- aminopolycarboxylic acids can be ethyltriacetic acid, ethylenediaminetetraacetic acid, ethylenediaminepentaacetic acid, triethylenetetraaminehexaacetic acid, and glutamine.
- Acid diacetate ethylenediamine nicosuccinic acid, and imino diacetic acid.
- amines include ethylenediamine, diethylenetriamine, triethylentramine, polyethylenepolyamine, polyethyleneimine, polyarylamine, pyrrole, polybieramine, and sipbases. These include dexoxime, dexine (8-oxyquinoline), glucamine, dihydroxicetilamine, and hydroxamic acid.
- Phosphoric acids include aminophosphoric acid and phosphoric acid.
- Thio compounds include thiol, thiocarboxylic acid, dithiocarbamic acid, and thiourea.
- a material capable of introducing a functional group capable of forming a metal chelate is used alone or in combination.
- the fibrous base material used in the semiconductor polishing slurry refining material according to the present invention include cellulose, polyvinyl alcohol, polyethyleneimine, polyester, polychlorinated biel, polyacrylonitrile, polyamide, and polyolefin.
- cellulose or polyvinyl alcohol is most preferable in consideration of the appropriate value of the hydroxyl value, which has an ethylenic hydroxyl group.
- the fibers used for the substrate include monofilaments of long fibers, multifilaments, spun yarns of short fibers, woven or knitted woven or knitted fabrics, and nonwoven fabrics. It is also possible to use fibers or woven or knitted fabrics which are composite or blended fibers of more than one kind.
- the diameter of the fiber used, particularly the single fiber as a long fiber is preferably 1 to 500 ⁇ m, more preferably 5 to 20 ⁇ m. 0 ⁇ ⁇ and a length longer than 10 mm is suitable.
- the base fibers in the form of short fibers in order to increase the contact efficiency with the polishing slurry to be treated.
- the preferred shape of the short fibers used here is 0.05 to 10 mm in length, preferably 0.1 to 0.1 mm. ⁇ 3mm, single fiber diameter :! It is about 500-500 ⁇ m, preferably about 5-200 ⁇ m, and the aspect ratio is about 1.1-600, preferably about 1.5-: L00.
- long fibers exceeding 5 mm can be used.
- the long fiber type material has a feature that it can be easily processed into a sheet or a float shape, while the short fiber type has a higher contact efficiency with the polishing slurry than the long fiber type. .
- a polishing process for wafer manufacturing such as a CMP process for device manufacturing, it is not necessary to remove metal ions and the like to a very low concentration (the concentration of metal ions and the like in a polishing slurry is generally 100%).
- the load of metal ions etc. on the chelating fiber is large and the replacement frequency is relatively high, the long fiber type that is easy to handle and easy to process is required. Is preferred.
- substantially all of the chelate-forming functional groups introduced on the surface of the fine fiber molecules effectively work to capture metal ions, etc. Demonstrate the ability to capture.
- a metal salt or an ammonium salt in which at least a part of the acid-type functional group is an alkali metal salt or an ammonium salt.
- One kind of semiconductor polishing slurry refining material can be used alone.However, depending on the properties of the semiconductor polishing slurry to be treated and the type of metal to be captured, different chelate formation as described above is performed. It is also possible to laminate or mix layers of two or more kinds of functional functional groups or different fiber substrates and shapes.
- a module in which the above-mentioned chelating fiber for polishing a semiconductor polishing slurry is fixedly filled in a container is exemplified.
- the chelate forming fibers for semiconductor polishing slurry purification are formed into a sheet or felt shape, and arranged in the flow path of the semiconductor polishing slurry, and the semiconductor material is formed into the sheet or felt shaped fiber material.
- the polishing slurry may be passed through.
- short fiber-like chelating fibers are filled so as to be able to flow into a container having an inlet and an outlet for the polishing slurry, and a filter is provided outside the container.
- a strainer may be used to prevent spillage.
- all of the processed polishing slurry is supplied to the semiconductor polishing step while removing metal ions and the like present in the semiconductor polishing slurry to be processed, or at least a part or all of the polishing slurry is processed.
- it can be re-introduced into the original semiconductor polishing slurry, circulated to further increase the level of removal of metal ions and the like, and then supplied to the semiconductor polishing process.
- metal ions and the like contained in the semiconductor polishing slurry are effectively chelate-trapped by the chelate-forming functional groups fixed in the chelate-forming fiber base material.
- pH is not changed throughout the purification process.
- the following method can be used.
- the polishing slurry to be purified is acidic
- a method in which the functional group capable of forming a metal chelate in the chelate-forming fiber is acid-type (H-type) is used.
- the method of converting the functional group capable of forming a metal chelate into the chelating fiber into an alkali metal salt or an ammonium salt can be used.
- the terminal group of the functional group capable of forming a metal chelate in the chelate-forming fiber is the same as the acid type or alkali metal salt or ammonium salt that controls the pH of the polishing slurry to be purified. This prevents polishing of the polishing slurry after purification while preventing the increase of different types of acids or alkali metal salts. ) It is possible to adopt a method to suppress H change.
- Another method of suppressing the pH change of the polishing slurry after purification is to predict the pH change of the polishing slurry after purification using the chelating fiber, and then prepare the polishing slurry before purification.
- One method is to adjust the pH of the slurry.
- FIG. 1 is a view schematically showing a semiconductor wafer polishing apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram schematically showing a main part of a polishing apparatus for a semiconductor wafer according to another embodiment of the present invention.
- FIG. 3 is a diagram showing a configuration of a metal removing apparatus used in the embodiment of the present invention.
- FIG. 4 is a diagram showing a configuration of a metal removing device used in the embodiment of the present invention.
- FIG. 5 is a diagram showing a configuration of a metal removing device used in the embodiment of the present invention.
- FIG. 6 is a diagram showing a configuration of a metal removing device used in the embodiment of the present invention.
- FIG. 7 is a graph showing the results of the polishing slurry after purification according to another embodiment of the present invention.
- FIG. 3 is a diagram showing an apparatus for suppressing H fluctuation.
- FIG. 8 is a view showing a filling form of the chelate fiber in the embodiment of the present invention.
- FIG. 9 is a view showing a filling form of the chelate fiber in the embodiment of the present invention.
- FIG. 10 is a diagram showing a filling form of the chelate fiber according to the embodiment of the present invention.
- FIG. 11 is a diagram showing a filling form of the chelate fiber in the embodiment of the present invention.
- FIG. 12 is a diagram showing a use form of the chelate fiber in the embodiment of the present invention.
- FIG. 13 is a diagram showing a use form of the chelate fiber in the embodiment of the present invention.
- FIG. 14 is a diagram showing a use form of the chelate fiber in the embodiment of the present invention.
- FIG. 1 is a diagram schematically illustrating an example of a semiconductor wafer polishing apparatus according to the present invention.
- reference numeral 10 denotes a polishing apparatus for a semiconductor wafer of this embodiment, and the polishing apparatus 10 includes a polishing apparatus main body 11 and a polishing slurry tank 12 for storing polishing slurry. ing.
- the polishing apparatus main body 11 is composed of a polishing slurry tray 13 and a platen 14 disposed in the tray 13 and having an upper surface covered with a polishing cloth or a pad so as to cover the entire surface. Has been.
- a pressing member 16 for pressing the wafer 15 placed on the polishing pad or pad onto the polishing pad or pad is disposed on the upper portion of the platen 14.
- the pressing member 16 revolves in the circumferential direction of the fixed bed 14 while rotating on the rotating shaft 16 a while pressing the wafer 15 on a polishing cloth or pad, and the surface of the wafer 15 is made uniform. Grind.
- a polishing slurry outlet port 18 provided at one end of the polishing slurry supply pipe 17 is opened on the fixed rock 14, and a polishing slurry suction port 1 is opened at the other end of the polishing slurry supply pipe 17. 9 is guided into the polishing slurry tank 12 and opens into the polishing slurry 20.
- a polishing slurry collecting pipe 21 for discharging the polishing slurry in the receiving tray 13 to the polishing slurry tank 12 is provided at the bottom of the polishing slurry receiving tray 13.
- a polishing slurry collection pipe 23 is connected to the polishing slurry supply pipe 1 ⁇ through a three-way valve (two two-way valves may be used) 22, and an end of the recovery pipe 23 opens on the polishing slurry tank 12. I have.
- a metal removing device 24 is provided upstream of the three-way valve 22 of the polishing slurry supply pipe 17, and the polishing slurry sucked up from the polishing slurry tank 12 by a pump 25 arranged further upstream thereof. Metal ions and the like in the slurry 20 are removed.
- the polishing slurry 20 sucked up by the pump 25 from the polishing slurry tank 12 passes through the polishing slurry supply pipe 17, passes through the metal removing device 24, and is discharged from the polishing slurry outlet 18. It is poured on Iwa 14 When the polishing slurry 20 passes through the metal removing device 24, an extremely large amount of metal is removed.Therefore, the polishing slurry containing no metal ions is supplied to the platen 14. You.
- the polishing slurry 20 supplied onto the fixed bed 14 is taken in between the polishing cloth or pad and the wafer 15 as the pressing means 16 rotates, and the pressing member is pressed. After the mirror polishing of the wafer is performed under the pressure of 16, it is collected in the polishing slurry receiving tray 13 and collected from the polishing slurry collecting pipe 21 into the polishing slurry tank 12.
- polishing slurry not containing metal ions or the like is supplied to the wafer 15, contamination and reattachment by the metal ions of the wafer 15 are suppressed.
- a part or all of the polishing slurry 20 that has passed through the metal removing device 24 can be returned to the polishing slurry tank 12 through the polishing slurry bypass pipe 23.
- concentration of metal ions or the like in the polishing slurry that has passed through the metal removal device 22 is higher than a desired concentration, a part or all of the polishing slurry is transferred to the polishing slurry tank by the polishing slurry bypass pipe 23. After the purity is increased by circulating back to 12, it is supplied to the polishing apparatus main body 11.
- FIG. 2 shows a main part of another embodiment of the present invention.
- a metal removal device 24a is attached in the middle of the polishing slurry collection pipe 21a for sending the polishing slurry 20 collected from the polishing slurry tray 13 to the polishing slurry tank 12.
- reference numeral 25a is a pump.
- 3 to 6 show examples of the configuration of the metal removing device 24 (24a) used in these embodiments.
- FIG. 3 shows, for example, a metal removing device 24 configured by filling a chelating fiber of the present invention in a container having a polishing slurry first inlet 17a and a polishing slurry first outlet 17b.
- Figure 4 shows, for example, the polishing slurry inlet 17a and the polishing slurry outlet 17 b, the upstream side of the metal removing device 24 constituted by filling the chelate fiber of the present invention in the container having the above-mentioned components, to remove particles generated from the polished portion or the device, or to use the slurry before use.
- a filter 26 was installed to adjust the particle size distribution to the same value.
- Fig. 5 shows a metal removal device 24 filled with the chelating fiber for slurry purification of the present invention on the upstream side, and a polishing portion or device for removing particles generated from the polishing or a slurry on the downstream side.
- the filter 26 is provided to adjust the particle size distribution to the same as before use or to remove particles generated from the metal removing device 24.
- Figure 6 shows a filter 26a installed on the upstream side to remove particles generated from the polished part and equipment and to adjust the slurry to the same particle size distribution as before use, and the middle stage of the slurry purification of the present invention.
- Metal removal device 24 filled with chelating fibers for use removes particles generated from polished parts and equipment downstream, adjusts slurry to the same particle size distribution as before use, removes metal Filters 26 b for removing particles generated from 24 are installed.
- the chelating fiber of the present invention when the polishing slurry is acidic as a method for suppressing a change in pH of the polishing slurry after the purification with respect to the H of the polishing slurry before the purification, the chelating fiber of the present invention is used. If the functional group capable of forming metal chelate is of the acid type (H type), and the polishing slurry to be purified is alkaline, the functional group capable of forming metal chelate in the chelate-forming fiber is replaced with an alkaline group.
- H type acid type
- the functional group capable of forming metal chelate in the chelate-forming fiber is replaced with an alkaline group.
- a method for preparing a metal salt or an ammonium salt, and further, an acid type or an alkaline type which controls a polishing slurry for purifying a terminal group of a functional group capable of forming a metal chelate in the chelate-forming fiber of the present invention prevents the change in pH of the polishing slurry after purification while preventing the increase of different types of acids or metal salts. Can be suppressed.
- FIG. 7 shows another embodiment of the present invention using an apparatus for suppressing the pH fluctuation of the polishing slurry after purification.
- pH measuring devices 27a and 27b are installed near the polishing slurry inlet and the polishing slurry outlet of the metal removing device 24, respectively. These pH measuring devices 27a From the measured values of, 27b, the control unit (not shown) calculates the required injection amount of the pH adjuster, and based on the result, the metal removal device 24 and the pH meter 27b
- the pH adjusting agent installed between the pumps 28 feeds the pH adjusting agent to the pipeline 17 via the fixed-rate injection means 28a by feedforward control or feedback control, and is used for polishing after purification.
- The: H fluctuation of the slurry is suppressed.
- Symbols 29 and 30 are sampling valves.
- FIGS. 8 to 11 show the filling state of the chelate fibers in the metal removing device 24 used in the present invention.
- FIGS. 8 and 9 show a structure in which the chelate fiber 31 used in the present invention is filled in a container 32, and the chelate fiber 31 is prevented from flowing into the pipe by a porous plate 33 for preventing the chelate fiber from flowing out. It shows a module. Note that a strainer may be used instead of the porous plate 33.
- Fig. 8 shows the case of upward flow water with good contact separation efficiency
- Fig. 9 shows the case of downward flow water with little pressure loss due to liquid flow. Can be selected.
- the chelating fiber for slurry purification for semiconductor polishing is one type. Can be used alone, but depending on the properties of the semiconductor polishing slurry to be treated and the type of metal to be captured, the above-mentioned different chelating functional groups or different fiber substrates and shapes Two or more types can be used in combination.
- chelate fibers having different chelate-forming functional groups are alternately laminated, or mixed and used as shown in Fig. 11 It is also possible.
- 31a and 31b indicate different chelate fibers, respectively.
- Fig. 12 shows the polishing fiber tank (container) 12a, in which short fiber-like chelate fibers 31 are put, stirred by a stirrer 34 (or an aerator) and flow-expanded. Strainer 35 is attached to polishing slurry suction port 19 of 17 so that chelate fiber 31 is not sucked into polishing slurry supply pipe 17.
- Figure 13 shows that instead of attaching a strainer 35 to the polishing slurry suction port 19 of the polishing slurry supply pipe 17, a filter 36 is provided in the middle of the pipe 17 and the metal removal device 24 is installed. Short fiber chelate fibers 31 are prevented from entering.
- Figure 14 shows a filter or sheet-like filter 37 that can pass chelate-forming fibers through the lower part of the polishing slurry tank (container) 12a.
- a slurry 20 obtained by diluting a 3% by weight colloidal sily stock solution simulating a polishing slurry by 1 ° -fold with ultrapure water was stored.
- the concentration of metal impurities in this slurry was 0.101 ⁇ b for iron, copper, and nickel, both of which were particularly hindered by contamination of silicon wafers.
- iron, copper, and nickel were added to this slurry 20 so that iron, copper, and nickel could be reduced from 30 ppb to 50 ppb. Dispersed uniformly in 20.
- a metal removing device 24 filled with various chelate fibers shown in Table 1 was connected in parallel to an intermediate portion of the polishing slurry supply pipe 17.
- the chelate fibers are all short fiber types with a single fiber diameter of 0.1 mm, a length of 1 mm, and an aspect ratio of 10.
- the chelate amount of copper is 0.8 mm o 1 / g. _ Fiber 'dry' was used.
- the performance of removing metal ions and the like was measured under the same conditions as in the examples using beaded chelate resins instead of chelate fibers.
- the bead-like chelating resin used in the comparative example is a spherical one having an effective diameter of 0.5 mm and a chelating capacity of copper SO.8 mmo1 / g—resin dry.
- Example 1 shows, for comparison, only iminoacetic acid as a representative of aminocarboxylic acids, in which the terminal group was changed to H-type because of the difference in removability depending on the terminal group, and Example 7 was used for comparison.
- fibers of iminoacetic acid and aminophosphoric acid were mixed at a weight ratio of 1: 1.
- the module of the metal removal equipment 24 used is a cylindrical container with a diameter of 75 mm and a length of 500 mm that can be sealed and used by passing the slurry in upward flow as shown in Fig. 8. did.
- the total amount of liquid passed through the module / re was once, and the flow velocity was set to AO h 1 for the space velocity (SV).
- a CMP process was performed for the purpose of polishing metal wiring composed of copper, tungsten, and the like.
- the amount of the polishing slurry in the polishing slurry tank 12 was 50 liters, the concentration of copper and tungsten before polishing was 1 ppm or less, and 60 ppm of iron was added as a polishing aid.
- the concentration of tungsten in the polishing slurry increased to 200 ppm and copper to 12 ppm, and the pH became acidic to 2.3. Had become.
- a metal removal device 24 is filled with various polishing slurry purifying materials 47, and a three-way valve 22 installed in the middle of the polishing slurry supply pipe 17 is provided for each semiconductor polishing slurry material. All of the semiconductor polishing slurry is returned to the polishing slurry tank 12 via a bypass pipe 23 returning to the polishing slurry tank 12 and returned to the polishing slurry tank 12 and circulated three times. Was measured. Each time the type of felt-like chelate-forming fiber was changed and the test was performed, the polishing slurry in the tank and the equipment system was all updated and the conditions such as the metal concentration were the same.
- the functional groups of the chelate fibers in the material for semiconductor polishing slurry purification include imino-rich acid as a typical example of aminocarboxylic acids, aminophosphoric acid as a typical example of phosphoric acids, and glucamine and amines as a typical example of hydroxylamine.
- imino-rich acid as a typical example of aminocarboxylic acids
- aminophosphoric acid as a typical example of phosphoric acids
- glucamine and amines as a typical example of hydroxylamine.
- one having a functional group of ethylenediamine was used, and the terminal group was H-type.
- the fiber base material listed in IS in Table 3 was used. [Table 3]
- the thickness of the loaded chelating fiber is 30 cm and the loading is 2000 g.
- the flow rate of the polishing slurry to the polishing slurry tank 12 was 51 / min. The goal here is to remove copper and tungsten to less than 1 ppm before polishing and to keep iron at 60 ppm.
- the iminoacetic acid type has a higher ability to remove copper than tungsten and iron
- the aminophosphoric acid type and dalcamic acid type have a higher ability to remove all metals
- the ethylenediamine type has a higher ability to remove iron and copper. It was found that the property was poor, but the property of removing tungsten was good.
- long fiber polishing slurries of iminoacetic acid type and ethylenediamine type are considered. Each material was processed into a 3 mm-thick sheet, and 50 sheets of each were alternately stacked so that the total thickness was 30 cm (iminoacetic acid type and ethylenediamine type). Weight ratio 1: 1).
- the material for producing a semiconductor polishing slurry of the present invention has a very large effective surface area as compared with the conventional resin tape type, and has a chelating functional group.
- the contact efficiency with metal ions and the like is high, the metal removal performance is very high, and the metal removal performance is very high.
- It may be a monofilament, a multifilament, or a spun yarn of a long fiber, a woven or knitted or woven fabric thereof, or a nonwoven fabric, or a nonwoven fabric.
- Composite or blended fibers, woven or knitted fabrics can also be used. Can be increased.
- a fiber base material or a material having a different form in combination selectivity can be given to the removability.
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Abstract
Description
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Priority Applications (4)
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EP04721670A EP1610365B1 (en) | 2003-03-18 | 2004-03-18 | Material for purification of semiconductor polishing slurry, module for purification of semiconductor polishing slurry and process for producing semiconductor polishing slurry |
JP2005503737A JP4644120B2 (ja) | 2003-03-18 | 2004-03-18 | 半導体研磨スラリー精製用素材、半導体研磨スラリー精製用モジュールおよび半導体研磨スラリーの精製方法 |
US10/549,294 US7625262B2 (en) | 2003-03-18 | 2004-03-18 | Material for purification of semiconductor polishing slurry, module for purification of semiconductor polishing slurry and process for producing semiconductor polishing slurry |
KR1020057017269A KR101088594B1 (ko) | 2003-03-18 | 2004-03-18 | 반도체 연마 슬러리 정제용 소재, 반도체 연마 슬러리 정제용 모듈 및 반도체 연마 슬러리의 정제 방법 |
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JP7208779B2 (ja) | 2018-12-11 | 2023-01-19 | キオクシア株式会社 | 基板処理装置 |
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JP4644120B2 (ja) | 2011-03-02 |
EP1610365A1 (en) | 2005-12-28 |
EP1610365A4 (en) | 2009-07-08 |
JPWO2004084287A1 (ja) | 2006-06-29 |
EP1610365B1 (en) | 2012-08-08 |
CN100437925C (zh) | 2008-11-26 |
US20060205325A1 (en) | 2006-09-14 |
WO2004084287A1 (ja) | 2004-09-30 |
US7625262B2 (en) | 2009-12-01 |
CN1771586A (zh) | 2006-05-10 |
KR101088594B1 (ko) | 2011-12-06 |
KR20050107803A (ko) | 2005-11-15 |
JP5107407B2 (ja) | 2012-12-26 |
JP2011003920A (ja) | 2011-01-06 |
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