WO1998008248A1 - Procede et dispositif pour laver des composants electroniques ou similaires - Google Patents
Procede et dispositif pour laver des composants electroniques ou similaires Download PDFInfo
- Publication number
- WO1998008248A1 WO1998008248A1 PCT/JP1997/002852 JP9702852W WO9808248A1 WO 1998008248 A1 WO1998008248 A1 WO 1998008248A1 JP 9702852 W JP9702852 W JP 9702852W WO 9808248 A1 WO9808248 A1 WO 9808248A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cleaning
- gas
- ultrapure water
- electronic component
- dissolved
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 126
- 238000005406 washing Methods 0.000 title claims description 82
- 239000012498 ultrapure water Substances 0.000 claims abstract description 181
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 180
- 239000007789 gas Substances 0.000 claims abstract description 171
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 54
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims description 252
- 239000007788 liquid Substances 0.000 claims description 83
- 238000004519 manufacturing process Methods 0.000 claims description 33
- 239000012528 membrane Substances 0.000 claims description 24
- 238000004090 dissolution Methods 0.000 claims description 18
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 238000010979 pH adjustment Methods 0.000 claims description 14
- 230000001678 irradiating effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims 2
- 150000002431 hydrogen Chemical class 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 abstract description 54
- 239000010703 silicon Substances 0.000 abstract description 54
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 53
- 235000012431 wafers Nutrition 0.000 description 95
- 239000000243 solution Substances 0.000 description 70
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 34
- 239000000126 substance Substances 0.000 description 31
- 239000010419 fine particle Substances 0.000 description 28
- 238000007872 degassing Methods 0.000 description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 23
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 22
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 18
- 230000000694 effects Effects 0.000 description 17
- 238000011282 treatment Methods 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 14
- 230000002378 acidificating effect Effects 0.000 description 14
- -1 etc. Substances 0.000 description 14
- 239000012535 impurity Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 14
- 229960002050 hydrofluoric acid Drugs 0.000 description 13
- 239000002253 acid Substances 0.000 description 11
- 229910021529 ammonia Inorganic materials 0.000 description 10
- 239000012510 hollow fiber Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 description 9
- 239000011259 mixed solution Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000005416 organic matter Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000005507 spraying Methods 0.000 description 7
- 230000003746 surface roughness Effects 0.000 description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 229910001882 dioxygen Inorganic materials 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- XEMZLVDIUVCKGL-UHFFFAOYSA-N hydrogen peroxide;sulfuric acid Chemical compound OO.OS(O)(=O)=O XEMZLVDIUVCKGL-UHFFFAOYSA-N 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 3
- 238000001459 lithography Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 241000894006 Bacteria Species 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
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 101150067539 AMBP gene Proteins 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-YPZZEJLDSA-N carbon-10 atom Chemical compound [10C] OKTJSMMVPCPJKN-YPZZEJLDSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013626 chemical specie Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical compound [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- XXQBEVHPUKOQEO-UHFFFAOYSA-N potassium peroxide Inorganic materials [K+].[K+].[O-][O-] XXQBEVHPUKOQEO-UHFFFAOYSA-N 0.000 description 1
- CLSKHAYBTFRDOV-UHFFFAOYSA-N potassium;molecular oxygen Chemical compound [K+].O=O CLSKHAYBTFRDOV-UHFFFAOYSA-N 0.000 description 1
- UAJUXJSXCLUTNU-UHFFFAOYSA-N pranlukast Chemical compound C=1C=C(OCCCCC=2C=CC=CC=2)C=CC=1C(=O)NC(C=1)=CC=C(C(C=2)=O)C=1OC=2C=1N=NNN=1 UAJUXJSXCLUTNU-UHFFFAOYSA-N 0.000 description 1
- 229960004583 pranlukast Drugs 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- 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
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/04—Non-contaminated water, e.g. for industrial water supply for obtaining ultra-pure water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/23—O3
Definitions
- the present invention relates to a method and an apparatus for cleaning components such as a semiconductor substrate, a glass substrate, an electronic component, and components for manufacturing these components.
- the electronic component element such as an LSI, ⁇ surface very c (Retsue if LSI that may be required to the purification is to form an insulating oxide coating Kei element on Shirikonweha, then this After providing a resist layer in a predetermined pattern on the film, removing the insulative film in a portion where the resist layer is not provided by etching or the like to expose metallic silicon, and washing the metal, and then p-type or The device is manufactured by repeating the lithography process, which introduces an n-type element and embeds metal wiring such as aluminum. The p-type and n-type; When embedding metal, if fine particles of metal, metal, mechanical objects, natural oxide film, etc.
- the silicon wafer surface cleaning step is a very important step in obtaining high-performance devices, and impurities adhering to the silicon wafer are possible. l; U must be removed.
- silicon wafers have been cleaned with sulfuric acid / hydrogen peroxide solution; mixed solution of hydrochloric acid / hydrogen peroxide solution, fluoric acid solution, fluorinated ammonium solution, etc., and ultrapure water This removes organic substances, fine particles, metals, natural oxide films, etc. attached to the silicon wafer surface without deteriorating the atomic level flatness of the silicon wafer surface.
- the following (1) to (13) are specific examples of a conventional silicon wafer cleaning process.
- (1) Sulfuric acid / hydrogen peroxide washing; Washing at 130 ° C for 10 minutes with a mixed solution of sulfuric acid: hydrogen peroxide 4: 1 (volume ratio).
- Ultrapure water washing step Washing with ultrapure water for 10 minutes.
- Ultrapure water washing step Washing with ultrapure water for 10 minutes.
- step (1) organic substances adhering to the silicon wafer surface ifii are removed in step (1).
- step (5) mainly the fine particles adhering to the silicon wafer surface are removed.
- step (9) mainly gold and metal impurities on the surface of the silicon wafer are removed.
- Steps (3), (7) and (11) are performed to remove the native oxide film on the silicon wafer surface.
- the cleaning liquid in each of the above-mentioned layers often has a contaminant removing ability other than the above-mentioned main purpose.
- the mixed solution of sulfuric acid and hydrogen peroxide used in method (1) has a strong action of removing metal impurities in addition to organic substances.
- an over-flow rinsing method in which ultrapure water is supplied from the bottom of the cleaning tank and overflows from the top of the cleaning tank, and once the entire wafer is ultrapure After the ultrapure water is stored in the cleaning tank until it is infiltrated with water, the quick dump rinse method that discharges the ultrapure water from the bottom of the cleaning tank is also used.
- cleaning methods such as spraying a cleaning solution or ultrapure water on the wafer surface in a shower shape, or cleaning the wafer by rotating the wafer at a high speed and spraying a cleaning solution or ultrapure water on the center thereof, etc.
- a so-called single wafer cleaning method is also employed.
- the cleaning with ultrapure water which is performed after each cleaning with the cleaning liquid, is performed for rinsing remaining liquid on the wafer surface; For this reason, the ultrapure water used for rinsing is ultrapure water with a purity that removes particulates, colloid-like substances, organic matter, metal ions, anions, dissolved oxygen, etc. to an extremely low level. This ultrapure water is also used as a solvent for the cleaning solution.
- the removal of the fine particles from the wafer surface is a particularly important issue because the fine particles attached to the surface of the silicon wafer significantly reduce the yield of the LSI.
- a mixed solution of ammonia and a hydrogen peroxide solution has been used to clean fine particles attached to the surface of a silicon wafer.
- ammonia and hydrogen peroxide react with each other to generate other chemical species, but it is not clear how these chemicals exert cleaning effects.
- No scientific knowledge has been obtained on how to obtain the optimum cleaning effect by adjusting the composition and ratio of the mixed solution. For this reason, in order to surely remove and remove fine particles on the wafer surface, an ammonia / hydrogen peroxide mixed solution having an excessively high concentration is used at present.
- the etching may be performed using a potash solution, but it is necessary to prevent the fine particles separated on the wafer surface from re-adhering to the wafer surface.
- the surface potential of the wafer surface and the particle should be R] encoded and repelled electrically, and for that purpose it was necessary to increase the pH of the cleaning solution to make it highly alkaline. .
- the surface of the wafer becomes rougher than necessary. Therefore, hydrogen peroxide solution is added to the solution, and an oxide film is formed on the surface by the action of the hydrogen peroxide solution. Had to be prevented. As a result, there is a problem that a large amount of chemicals are consumed more than necessary, and that a large amount of ultrapure water for rinsing and a large wastewater treatment cost are involved.
- the conventional cleaning process forms on the surface of the silicon wafer. I have.
- rinsing with ultra-pure k may cause some problems as described below.
- the cleaning tank in an airtight structure in order to solve the above-mentioned problem caused by the dissolution of oxygen gas in the atmosphere into ultrapure water.
- 10 to 7 moles of hydroxyl ions are present per liter in neutral ultrapure water, and the hydroxyl ions etch the silicon wafer surface to a depth of several angstroms.
- the surface is easily roughened.
- silicon etched by the hydroxyl ion adheres to the surface of the silicon wafer, causing clouding and the like on the surface of the silicon wafer.
- organic molecules attached to the silicon wafer surface degrade the performance of the LSI and significantly reduce the yield of the LSI.
- Ma If the organic matter becomes a film and metal impurities or fine particles adhere to the inside of the film, or if a natural oxide film is formed, washing with fluoric acid, washing with hydrochloric acid and hydrogen peroxide, ammonia peroxide There was a problem that even if cleaning with hydrogen water, etc., it was not possible to sufficiently remove metal impurities, fine particles, natural oxide films, and the like.
- Wastewater and wastewater treatment facilities are required, and the installation and operation costs for such treatment facilities are enormous, which raises the problem of raising product manufacturing costs.
- sulfuric acid and hydrogen peroxide washing is performed at a high temperature, not only a heat source is required, but also a chemical gas is generated, so it is necessary to discharge a product gas from the clean room. As a result, there is a problem that costs for heat source and exhaust are also increased.
- a method of removing organic substances by washing with ultrapure water in which ozone gas is dissolved has begun to be put into practical use.For example, ultrapure water in which 2 to 10 ppm of ozone gas is dissolved is used for 10 minutes at room temperature.
- a method of i'm fighting has also been proposed.
- the method of washing at room temperature with ultrapure water in which ozone gas is dissolved in the method of (1), when the amount of organic matter attached is large, or when the organic matter is hardly decomposable, etc., the finished product is sufficiently removed. It is difficult to perform the cleaning, and there is a possibility that organic matter remains even after long-time cleaning.
- the present inventors focused on the oxidation-reduction potential of the cleaning solution and conducted research on how the oxidation-reduction potential of the solution affects the surface potential.
- the oxidation-reduction potential of the liquid is in the reducing region, the surface potential of the wafer surface and the fine particles can be negatively charged even when ⁇ ⁇ ⁇ is near neutral, preventing the fine particles from re-adhering due to electrical repulsion.
- the present invention has been completed based on the findings of the present invention.
- the present invention can contribute to a reduction in the amount of a cleaning liquid or ultrapure water required for cleaning, and can prevent redeposition of fine particles and perform more effective cleaning even at a lower temperature than before. It is an object of the present invention to provide a kind of cleaning method and a cleaning device.
- the present inventors conducted a thorough examination in order to solve the above problems, and as a result of dissolving hydrogen gas in ultrapure water so as to have a negative oxidation-reduction potential and to have a pH of 7
- the use of an acidic cleaning solution adjusted to an acidic side less than the above has found that there is no danger of forming an oxide film on the silicon wafer surface due to the presence of oxygen and that the surface roughness of the silicon wafer can be prevented.
- the present invention provides a reliable method without causing an oxide film or surface roughness on the surface of a metal component such as a silicon wafer.
- the purpose is to provide garments.
- the present inventors have conducted various studies to solve the above problems, and found that not only washing with ultrapure water in which ozone gas is dissolved, but also washing with ozone gas in ultrapure water.
- the present inventors have found that organic substances can be easily and reliably removed by washing with a washing solution, and the present invention has been completed based on such findings.
- INDUSTRIAL APPLICABILITY The present invention relates to an electronic component and a component that can contribute to a reduction in the amount of chemicals and ultrapure water required for cleaning, and that can reliably and easily remove organic substances on the surface of the electronic component at a low temperature. It is an object of the present invention to provide a washing method and a washing device.
- the present invention relates to a method for cleaning electronic parts or parts such as electronic parts or parts of a manufacturing apparatus for the same, wherein the electronic parts are cleaned by dissolving hydrogen gas in ultrapure water.
- the cleaning is performed with a cleaning solution having a negative oxidation-reduction potential.
- the pH of the cleaning solution in which the hydrogen gas is dissolved is 7 or more and less than 11.
- the wafer surface and the surface potential of the fine particles can be negatively charged in a neutral to alkaline pH range. . Therefore, it is possible to prevent the fine particles from re-adhering due to the repulsion. Therefore, it is possible to prevent the re-adhesion of the fine particles and to contribute to the reduction of the amount of the cleaning liquid and ultrapure water required for the cleaning. Can be.
- the cleaning solution in which the hydrogen gas is dissolved is made acidic
- PH is less than 7 and 3 or more.
- the cleaning liquid dissolves hydrogen gas of 0.05 ppm or more.
- the present invention relates to a method of cleaning electronic parts and components such as components and components of a manufacturing apparatus for the same, wherein J-, ' ⁇ ', and other materials are dissolved in ultrapure water to dissolve ozone gas.
- the cleaning solution is characterized by being cleaned with an alkaline cleaning solution having a positive oxidation degree.
- the alkaline washing solution dissolves ozone gas of 0.05 ppm or more.
- the ozone-containing cleaning liquid has a pH of more than 7 and 11 or less.
- the above-mentioned cleaning liquid in which hydrogen gas or ozone is dissolved is ultrapure water that has been degassed so that the concentration of dissolved oxygen is less than 10 Ppm.
- the electronic component members are cleaned with the cleaning liquid while irradiating ultrasonic waves.
- the frequency of the ultrasonic wave to be applied is 30 kHz or more.
- the cleaning liquid further dissolves a rare gas.
- the temperature of the cleaning liquid is adjusted to 20 ° C. to 60 ° C. for cleaning. Suitable.
- the hydrogen gas or the ozone gas is dissolved into ultrapure water through a gas permeable membrane.
- An apparatus for cleaning an electronic component member according to the present invention is for performing the above-described method.
- the cleaning effect can be enhanced by changing the oxidation-reduction potential of the cleaning water of ultrapure water by dissolving the gas and adjusting the pH to an appropriate value according to the intended use.
- the properties of the washing liquid can be made more appropriate by degassing before degassing.
- washing can be made more effective by heating, irradiating ultrasonic waves, and the like during washing.
- FIG. 1 is a diagram showing a configuration of cleaning and concealment of the first and second embodiments of the present invention.
- FIG. 2 is a diagram showing a configuration of a gas dissolving tank suitable for the present invention.
- FIG. 3 is M showing an example of the configuration of a pH adjustment device suitable for the present invention.
- FIG. 4 is a diagram showing another example of the configuration of the p11 adjusting device suitable for the present invention.
- FIG. 5 shows a configuration of a washing apparatus according to a third embodiment of the present invention.
- examples of electronic component members (objects to be cleaned) to be cleaned include various components and materials used in the electronic component manufacturing field and the like.
- Manufacture of semiconductor substrates such as semiconductor wafers, substrate materials such as glass substrates for LCDs, finished products such as electronic components such as memory devices, CPUs, and sensor devices, as well as products such as quartz reaction tubes, cleaning tanks, and substrate carriers.
- An example is a component for an apparatus.
- ultrapure water is obtained by treating raw water such as industrial water, h water, well water, river water, lake water and the like with a pretreatment device such as coagulation sedimentation, filtration, coagulation filtration, and activated carbon treatment.
- a primary pure water production device mainly composed of a desalination device such as an ion exchange device and a reverse osmosis membrane device, fine particles, colloidal materials and organic matter are removed. Most of impurities such as metal ions and anions are removed,
- the primary pure water is circulated through a secondary pure water production system consisting of an ultraviolet irradiation device, a mixed-bed polisher, a membrane treatment device equipped with an ultrafiltration membrane and a reverse osmosis membrane, and the remaining fine particles and colloid are removed.
- a secondary pure water production system consisting of an ultraviolet irradiation device, a mixed-bed polisher, a membrane treatment device equipped with an ultrafiltration membrane and a reverse osmosis membrane, and the remaining fine particles and colloid are removed.
- High-purity water from which impurities such as organic substances, organic substances, metal ions, and anions have been removed as much as possible.
- the quality of the water is, for example, an electric resistivity of 17.0 1 ⁇ cm or more.
- Organic carbon is less than 100 ⁇ g C / liter, the number of fine particles (particle size is more than 0.07 ⁇ m) is less than 50 / milliliter, and the number of viable bacteria is 50 ⁇ / liter.
- Torr or less silica is less than 10 ⁇ g S i 0 2 / liter and sodium is less than 0.1 g Na / liter.
- the ultrapure water production apparatus refers to a combination of the above-described pretreatment apparatus, primary pure water production apparatus, and secondary pure water production apparatus.
- a deaerator such as an empty deaerator or a membrane deaerator using a gas permeable membrane is added after the primary pure water production equipment.
- Water, bowl water, river water, lake water, etc. may be used in combination with water collected from each pole collected in the factory.
- FIG. 1 shows an example of a cleaning device for electronic parts and members of the present invention, wherein 1 is an ultrapure water production device, 2 is a gas dissolving tank, 3 is a pH adjusting device, and 4 is a washing bath. .
- This equipment further includes a degassing device 5 for removing gas dissolved in the ultrapure water produced by the ultrapure water production device 1 and a cleaning target to be cleaned in the cleaning tank 4, if necessary.
- An ultrasonic irradiation device 7 for irradiating the object 6 with ultrasonic waves is provided.
- the ultrapure water production device 1 includes a pretreatment device, a primary pure water production device, and a secondary pure water production device. Then, the pretreatment device treats the raw water with a coagulation sedimentation device, a sand filtration device, and an activated carbon filtration device.
- the primary purified water production equipment treats this pretreated water with a reverse osmosis membrane device, a two-bed three-column ion exchanger, a mixed-bed ion exchanger, and a precision filter to obtain primary pure water.
- the secondary pure water production equipment applies ultraviolet rays, mixed-bed polishers, and ultrafiltration membrane treatment to primary pure water to remove fine particles, colloid substances, organic substances, metal ions, anions, etc., remaining in primary pure water. Is removed.
- the ultrapure water produced by the ultrapure water production apparatus 1 has, for example, the water quality shown in Table 1 below. It is said that if such water is ultrapure water, contaminants in the ultrapure water will not adhere to the wafer surface. 1] Electric resistivity 18.0 ⁇ ⁇ cm or more Total organic carbon 10 g C / liter or less Number of fine particles 10 particles / milliliter or less
- this degassing device 5 it is particularly preferable to remove oxygen gas, nitrogen gas and carbon dioxide gas dissolved in ultrapure water, and the concentration of one or more of these dissolved gases is less than 10 ppm It is preferable to degas so that the concentration is preferably 2 ppm or less. If the dissolved gas concentration is 10 ppm or more, bubbles are generated during washing, the bubbles adhere to the object to be cleaned, and the cleaning effect of the portion to which the bubbles adhere is reduced.
- a method for degassing dissolved gas in ultrapure water a method of vacuum degassing via a gas permeable membrane is preferable.
- the degassing apparatus hydrogen gas is dissolved in ultrapure water from which oxygen gas, nitrogen gas, carbon dioxide gas, and the like that has been degassed are degassed in gas efficiency 2.
- the cleaning solution obtained by dissolving hydrogen gas in ultrapure water in the gas dissolving tank 2 has a negative oxidation-reduction potential, but the dissolved water ⁇ gas in the cleaning solution is at 25 ° C and 1 atmosphere It is preferably at least 0.05 ppm, particularly preferably 0.8 to 1.6 ppm. If the concentration of hydrogen gas is less than 0.05 ppm, it is often insufficient to set the oxidation-reduction potential of the liquid to the lower potential side. As a result, Table 2 in Examples described later shows that As shown, the effect of removing fine particles on the surface of the object to be cleaned tends to decrease.
- washing in which the effect of removing fine particles is desired to be obtained in seven minutes, it can be said that a washing solution obtained by dissolving hydrogen gas in ultrapure water whose pH is changed from neutral to neutral is preferable. Also, it can be seen that by adjusting the pH to 8 or more, a sufficient particle removing effect can be obtained.
- Methods for dissolving hydrogen gas in ultrapure water include: dissolving hydrogen gas in ultrapure water by injecting hydrogen gas through a gas permeable membrane; dissolving hydrogen gas in ultrapure water by bubbling hydrogen gas; A method of dissolving hydrogen gas in ultrapure water via an ejector, a method of supplying hydrogen gas upstream of a pump that supplies ultrapure water to the gas dissolution tank 2, and dissolving it by stirring in the pump, etc. No.
- FIG. 2 shows an example in which hydrogen gas obtained by electrolyzing ultrapure water is dissolved in ultrapure water in a gas dissolving tank 2.
- hydrogen gas is injected into ultrapure water through a gas permeable membrane and dissolved.
- reference numeral 8 denotes an ultrapure water electrolyzer, and ultrapure water introduced into the ultrapure water electrolyzer 8 from the ultrapure water supply pipe 9 is electrolyzed in the digester 8 to The high-purity hydrogen gas generated in the power sword chamber is sent to the gas dissolving tank 2 by the hydrogen gas supply fl0.
- the gas dissolving tank 2 is provided with a gas permeable membrane 11, and the ultrapure water supplied from the ultrapure water supply pipe 12 to the gas dissolving tank 2 is supplied to the gas dissolving tank 2 via a gas permeation degassing unit 11.
- the hydrogen gas supplied from 8 to ij is dissolved, and the ultrapure water in which the hydrogen gas is dissolved is sent from the supply pipe 13 to the pH adjusting device 3.
- 14 is a drain valve for discharging ultrapure water after electrolysis
- 15 is a pressure gauge for measuring the hydrogen gas pressure in the gas dissolving tank 2
- 16 is a gas; supplied to the dissolving tank 2.
- An exhaust treatment device for exhausting the treated hydrogen gas, and 1) is a control valve for controlling the amount of supplied hydrogen gas.
- the cleaning solution obtained by dissolving water and gas in the gas dissolving tank 2 is adjusted in pH by a pH adjusting device 3. It is preferable to adjust the ⁇ of the first liquid to 7 or more, more preferably 7 or more, and more preferably 8 to 10;
- an alkaline aqueous solution such as aqueous ammonia, sodium hydroxide, potassium hydroxide, or tetramethylammonium hydroxide ( ⁇ ⁇ ⁇ )) or an alkaline gas such as ammonia gas is used.
- an alkaline aqueous solution such as aqueous ammonia, sodium hydroxide, potassium hydroxide, or tetramethylammonium hydroxide ( ⁇ ⁇ ⁇ )
- an alkaline gas such as ammonia gas
- the pH adjusting device 3 the one shown in FIGS. 3 and 4 can be employed.
- the cleaning liquid whose ⁇ has been adjusted by the pH adjusting device 3 is sent to the cleaning tank 4, and as described above, the cleaning liquid dissolves hydrogen gas preferably in an amount of 0.05 ppm or more, and Is preferably 7 or more. Therefore, in the middle of the cleaning liquid supply pipe 22 that supplies the cleaning liquid to the cleaning tank 4, an oxidation-reduction potentiometer 18, a dissolved hydrogen concentration meter 19, and hydrogen An ion concentration meter 20 is installed to monitor the oxidation-reduction potential in the cleaning solution, the concentration of hydrogen and the pH at all times, and to adjust the amount of hydrogen gas dissolved in ultrapure water and the pH in the gas dissolution tank 2. It is preferable to configure so as to control the addition force M added in 3. These controls are performed by the control device 30.
- the control device 30 may be provided separately for each control target.
- the method of cleaning the object 6 to be cleaned in the cleaning tank 4 with the cleaning liquid includes a bath cleaning method in which the object to be cleaned 6 is immersed in the cleaning liquid, and a method of cleaning the object 6 while circulating the cleaning liquid.
- a method of spraying and washing, and a method of spraying a pre-cleaning solution onto the object 6 to be washed which is rotated at a high speed, and the like.
- the washing tank 4 is provided with a heater 21 so that the temperature of the solution can be adjusted as needed. In order to obtain a better cleaning effect, it is preferable to wash the pre-cleaning solution by adjusting the temperature to 20 to 60 ° C. It is more effective to use ultrasonic irradiation at the same time as washing.
- Ultra ff waves generated from the ultrasonic irradiation device 7 preferably have a frequency of 30 kHz or more. For example, in the batch cleaning method, an ultrasonic wave is applied.
- the cleaning liquid 6 is immersed in the cleaning liquid supplied into the cleaning tank 4;
- the cleaning liquid contains LI gas dissolved in LI !.
- the rare gas include helium, neon, argon, krypton, and xenon, or a mixture of two or more thereof.
- the rare gas is preferably dissolved in a cleaning solution of 0.05 ppm or more.
- the dissolution is preferably performed simultaneously or continuously in the gas dissolving tank 2 for dissolving the hydrogen gas.
- a method for dissolving the rare gas a method similar to the method for dissolving hydrogen gas in ultrapure water can be adopted.
- the cleaning apparatus of the present invention uses oxygen, nitrogen, It is preferable to have a gas seal structure in order to prevent gas components such as from being mixed.
- a gas seal structure in order to prevent gas components such as from being mixed.
- a wafer in which hydrogen particles are dissolved in ultrapure water and a wafer whose fine particles on the surface have been washed with a redox solution having a ⁇ position, after rinsing with ultrapure water, For example, it is moved to the surface metal removal process.
- a 6-inch silicon wafer ( ⁇ -Sil OO) is immersed in a 0.5% diluted hydrofluoric acid solution for 10 minutes, rinsed with ultrapure water for 5 minutes by overflow rinsing, and then the wafer is After immersion for 10 minutes in a contaminated liquid prepared by adding aluminum particles having an average particle size of 1 m to ultrapure water so as to obtain a volume of 100 ke / milliliter, the o-bar flow rinse method The sample was rinsed with ultrapure water for 5 minutes and spin-dried. 25 samples of each of the samples were washed with a washing solution of
- the cleaning solution of Example 1-1 uses ultrapure water in which hydrogen gas has been dissolved without adjusting the pH, and the cleaning solution of Examples 1-2 to 15 and Examples 1 to 7 dissolves hydrogen gas.
- the pH of the purified ultrapure water was adjusted and used with ammonia, and the cleaning solution of Example 1-16 was used by adjusting the pH of ultrapure water in which hydrogen gas and argon were dissolved with ammonia.
- the cleaning liquid of No. 8 used ultrapure water in which carbon dioxide gas and hydrogen gas were dissolved.
- the cleaning liquid of Comparative Example 11 used only ultrapure water, and the cleaning liquid of Comparative Example 11 used ammonia and hydrogen peroxide dissolved in ultrapure water in which hydrogen gas was not dissolved.
- Example 13 The cleaning liquid used in Example 13 was prepared by dissolving hydrogen peroxide in ultrapure water without dissolving hydrogen gas.
- the washing tank capacity was 10 liters, and the overflow amount of the washing liquid in the case of the batch overflow method was 1 liter / min. Contaminated with aluminum particles.
- Table 2 shows the number of aluminum particles adhering to the wafer surface before and after cleaning the wafer and the roughness of the wafer surface after cleaning.
- the number of particles on the wafer surface was measured using a laser scattering type wafer surface attached particle inspection device (manufactured by TOPCON: WH-3) for fine particles of 0.2 mm or more, and the average value of 25 wafers was measured. Indicated.
- the roughness of the wafer surface was measured with an atomic force microscope (Seiko Electronics: AFM—SPI • 3600).
- the same silicon wafer as in the above example was washed with a hydrofluoric acid solution in the same manner, and then treated with a contaminated liquid containing aluminum particles. Twenty-five samples were prepared using the cleaning liquid shown in Table 3, respectively. The substrate was washed under the conditions shown in the following, rinsed with ultrapure water for 5 minutes, and spin dried.
- the cleaning liquid of Examples 1-9 uses ultrapure water in which hydrogen gas is dissolved without adjusting the pH.
- the cleaning liquid of Examples 11-10 to 13 is ultrapure water in which hydrogen gas is dissolved. Was used after adjusting the pH with an ammonia.
- the cleaning liquids of Comparative Examples 1-4, Comparative Examples 1-5, and Comparative Examples 16 used the same cleaning liquids as those of Comparative Examples 11-11, Comparative Examples 1-2, and Comparative Examples 13-13, respectively.
- the capacity of the pre-cleaning tank was the same as that of the above embodiment, and the overflow amount of the washing solution in the case of the bath overflow method was also 1 liter / min. Note that, in Example 19-1-1-3 and Comparative Example 14-1-1-6, no ultrasonic irradiation was performed during washing. Table 3 shows the number of aluminum particles adhering to the wafer surface before and after cleaning contaminated with aluminum particles, and the roughness of the dT surface of the wafer after cleaning.
- Ratio 4 1 1 ⁇ -1 1 4 (Ml ⁇ , bar u-), 'is 1 0 7 8 6 0 ⁇ 5 0 J
- a cleaning effect equal to or higher than that of the conventional method can be obtained without using a large amount of cleaning liquid as in the conventional method.
- the cost of pure water can be reduced, and the cost of treating used cleaning solution can be reduced.
- the product cost can be reduced as compared with the case where the conventional cleaning method is adopted.
- Can contribute to the reduction of The cleaning method of the present invention can remove fine particles on the silicon wafer surface more effectively at a lower pH than the conventional method of cleaning with a mixed solution of ammonia and hydrogen peroxide. It is not necessary to eliminate a large amount of ammonia water as described above, and it is possible to reduce the cost of raw materials and to reduce wastewater treatment equipment, and to reduce the size of wastewater treatment equipment.
- the processing cost can be reduced.
- the treatment can be performed with a lower ⁇ ⁇ ⁇ than the conventional method, it is not necessary to use hydrogen peroxide to prevent the silicon wafer surface from being roughened due to the use of heat. Various effects such as contributing to further reduction.
- the overall configuration is as shown in FIG. 1 as in the first embodiment described above.
- the pH of the cleaning water is adjusted so as to suppress the formation of the oxide film and to prevent the surface of the object to be cleaned from being roughened in the rinse after the chemical cleaning. Is acidified.
- Hydrogen gas is dissolved in the gas dissolving tank 2 in the ultrapure water produced by the ultrapure water producing apparatus 1 in the same manner as in the first embodiment. Since ultrapure water is usually degassed during production, the dissolved oxygen concentration in the ultrapure water is very low, but the dissolved oxygen is not completely removed. However, by dissolving hydrogen gas in ultrapure water, the negative effect of dissolved oxygen can be eliminated by setting the oxidation-reduction potential of the solution to a negative value, and the dissolved gas is usually dissolved at 25 ° C and 1 atmosphere. It is preferable to dissolve hydrogen gas in the gas dissolving tank 2 so that the hydrogen concentration becomes 0.05 ppm or more, particularly 0.8 to 1.6 ppm.
- the oxidation-reduction potential of the liquid may not be able to be reliably set to a negative value.
- the degassing device 5 should be used to further remove the dissolved oxygen remaining in the ultrapure water before introducing the ultrapure water into the gas dissolution tank 2. It is good.
- the degassing device 5 it is preferable to remove particularly oxygen gas and nitrogen gas dissolved in pure water, and the concentration of one or more of these dissolved gases is less than 10 ppm, preferably 2 ppm. It is preferable to degas so as to be less than ppm. In addition, if the concentration of the existing gas becomes 10 ppm or less J: When washing, the wrapping is generated during washing, and the garment is washed; ⁇ It will be around. These points are the same as in the first embodiment.
- a method of degassing dissolved gas in ultrapure water in the degassing device 5 a method of vacuum degassing via a gas permeable membrane shown in FIG. 2 is preferable. However, other methods may be employed.
- the gas permeable membrane in the gas dissolving tank 2 and the pre-gas removal device 5 may be made of a gas-philic material such as silicon or a water-repellent material such as a fluorine-based resin.
- a structure in which fine holes are provided and gas is permeable but water is not permeable is used.
- the gas permeable membrane can be used as a hollow fiber structure.
- the gas permeable membrane is formed into a hollow fiber structure, the gas permeates from the inner space side of the hollow fiber to the outside as a method of degassing and gas dissolution. Any of a method and a method of permeating gas from the outside of the hollow fiber to the inside of the hollow fiber can be adopted.
- ⁇ ⁇ is adjusted in the ⁇ ⁇ adjusting device 3.
- ⁇ ⁇ ⁇ is less than 7, preferably ⁇ 7 is less than 7. It is adjusted to less than 3, more than 3, more preferably in the range of 4-6.
- hydrogen gas By adjusting the pH of the ultrapure water containing dissolved water to be acidic, it is possible to suitably prevent an oxide film from being formed on the surface of the object to be cleaned and to prevent the surface from being roughened. Therefore, it is preferable to use acidic hydrogen gas-dissolved ultrapure water in cleaning for such purposes.
- a method of dissolving an acid or acid gas in ultrapure water in which hydrogen gas is dissolved is adopted.
- the acid for example, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, fuchic acid, or the like is used.
- the acid gas for example, carbon dioxide gas is used.However, a method of dissolving the carbon dioxide gas and adjusting the pH is used together. It is preferable because the influence of ions is small.
- the pH adjustment device 3 can be composed of, for example, a storage tank 23 for storing acid and a pump 24, and a gas dissolution tank 2 A method is adopted in which an acid is added and mixed in the middle of a pipe for supplying a liquid to the washing tank 4 from the tank.
- reference numeral 25 denotes a control valve for adjusting the supply M of the acid.
- the pH adjusting device 3 is arranged in parallel with the gas supply device iS 26 for supplying the acidic gas as shown in FIG. Dismantling tank 27.
- the gas solution 27 the same structure as the gas dissolving tank 2 for dissolving the hydrogen gas can be used.
- the acidic cleaning solution whose pH has been adjusted by the pH adjusting device 3 is sent to the tank 4, but as described above, the cleaning solution has a pH of less than 7 and dissolves water scum and becomes negative. It must have an oxidation-reduction potential. For this reason, a redox potential meter 18, a hydrogen concentration meter 19, and a hydrogen ion concentration meter 20 are provided in the middle of the cleaning solution supply pipe 22 for supplying the cleaning solution to the tank 4, and the oxidation-reduction potential in the cleaning solution is provided. , The concentration of dissolved hydrogen and the pH are monitored constantly, and the amount of hydrogen gas dissolved in ultrapure water in the gas dissolution tank 2 and the amount of acid and acid gas added in the ⁇ adjustment device 3 are controlled. It is preferable to configure it so that it can be used. This control is performed by the control device 30.
- a method for cleaning the object 6 to be cleaned in the cleaning tank 4 with an acidic cleaning liquid As a method for cleaning the object 6 to be cleaned in the cleaning tank 4 with an acidic cleaning liquid, a batch cleaning method, a circulating cleaning method, a flow cleaning method, and a method in which the cleaning liquid A method of washing by spraying, a method of washing by spraying a washing liquid on the object 6 to be washed, which is rotated at a high speed, and the like are exemplified.
- the configuration and operation of the heater 21 and the ultrasonic irradiation device iS7 are the same as those of the first embodiment. Also, the dissolution of the rare gas, the gas seal of the cleaning device, the position of pH adjustment, and the like are the same as those in the first embodiment.
- a 6-inch silicon wafer substrate (n + Sil 00) from which impurities on the surface were removed by RCA cleaning was immersed in 0.5% diluted hydrofluoric acid for 10 minutes to treat the wafer surface.
- the wafer was washed with a washing liquid having the composition shown in Table 4 using a washing apparatus shown in FIG. 11, and then spin-dried.
- the pH of the washing solution was adjusted with hydrochloric acid using the pH adjusting device shown in FIG. Table 4 shows the results of measuring the oxide film thickness and surface roughness of the wafer surface before and after the treatment with the cleaning liquid.
- Example 3-1 The same treatment as in Example 3-1 was performed except that the ultrapure water shown in Fig. 4 was used instead of the acidic cleaning solution.
- Table 4 shows the measurement results of the oxide film thickness and surface roughness of the wafer surface before and after treatment with ultrapure water.
- a 6-inch silicon wafer substrate (n + Sili00) from which RCA cleaning was performed to remove metallic impurities was immersed in 0.5% hydrofluoric acid for 10 minutes to treat the wafer surface.
- the wafer was washed with a washing solution having the composition shown in Table 4 using the washing apparatus shown in FIG. 1 and then spin-dried.
- the pH of the washing solution was adjusted with potassium dioxide using the pH adjusting device shown in FIG. Table 4 also shows the results of measurement of the ueno, surface oxide film thickness, and surface roughness before and after treatment with the cleaning solution.
- the cleaning method of the second embodiment of the present invention in the process of cleaning electronic component members such as silicon wafers, compared to the conventional method of cleaning the wafer surface with ultrapure water, the surface of electronic component members is reduced. There is no danger of roughening the surface or forming a thick oxide film on the surface, so that the surface of the electronic component members can be easily cleaned to a completely clean surface.
- the overall configuration of the third embodiment is as shown in FIG. 5, it is basically the same as the first and second embodiments.
- the ozone gas is dissolved in the gas dissolving tank 2.
- the washing water is adjusted to be alkaline.
- a dissolved ozone concentration meter 31 is provided in place of the dissolved hydrogen concentration meter 19.
- Ozone gas is dissolved in the ultrapure water produced by the ultrapure water producing apparatus 1 in the gas dissolving tank 2.
- the surface of wafers By dissolving ozone gas in ultrapure water, the surface of wafers It can be used as a cleaning solution having a positive oxidation suitable for removal of equipment and a source potential.
- the dissolved ozone concentration at 25 ° C and 1 atm is 0.05 ppm or more, especially 1 ppm. It is preferable to dissolve the ozone gas in the gas dissolving tank 2 so that the concentration becomes 10 ppm.
- the ultrapure water supplied to the gas dissolving tank 2 is usually subjected to degassing during production, so the dissolved gas concentration in the ultrapure water is extremely low.
- the degassing device 5 Before introducing ultrapure water into the gas dissolution tank 2, the degassing device 5 converts it into ultrapure water because it reacts and ionizes or dissociates and ionizes in water to lower the resistivity. It is preferable to remove the remaining dissolved nitrogen and dissolved carbon dioxide.
- the degassing device 5 it is preferable to degas so that the total dissolved gas concentration in the ultrapure water supplied to the waste gas dissolving tank 2 is 10 ppm, preferably 2 ppm or less. If the dissolved gas concentration is 10 ppm or more, bubbles are generated at the time of washing, the bubbles adhere to the object to be cleaned, and the effect of washing the portion where the bubbles adhere is reduced.
- a method for degassing the dissolved gas in the ultrapure water a method in which degassing is performed through a gas permeable membrane is preferable.
- a method of dissolving ozone gas in ultrapure water a method of injecting ozone gas into ultrapure water through a gas permeable membrane to dissolve it, a method of dissolving ozone gas by bubbling ozone gas in ultrapure water, and a method of dissolving ozone gas in ultrapure water
- ozone gas to be dissolved in ultrapure water in the gas dissolving tank 2 ozone gas generated by reducing hydroxide in ultrapure water by electrolysis of ultrapure water is preferable because of its high purity.
- the gas permeable membrane in the gas dissolving tank 2 and the degassing device 5 is, as in the above-described case, made of a gas-philic material such as silicon or a film made of a water-repellent material such as a fluororesin. A large number of micropores are provided so as to allow gas to permeate, but water is not transmitted.
- the gas permeable membrane can be used as a hollow fiber structure.
- a method of degassing or dissolving gas is a method of permeating a gas from the inside to the outside of the hollow fiber, Either method of permeating gas from the outside of the hollow fiber to the inside of the hollow fiber can be adopted. You.
- the gas dissolving tank 2 has the same configuration as that for dissolving hydrogen gas shown in FIG. 2, but dissolves ozone gas instead of hydrogen gas. That is, in the gas dissolving tank 2, the ozone gas is dissolved in the ultrapure water supplied from the ultrapure water supply pipe 12 to the gas dissolving tank 2 through the gas permeable membrane 11, and the ultrapure water in which the o The water is sent from the supply line 13 to the pH regulator 3. That is, ozone gas is supplied to the gas dissolving tank 2 from the hydrogen gas supply pipe 10 in the figure.
- the cleaning method of the present invention utilizes the fact that ozone in an alkaline cleaning solution is decomposed and the decomposed ozone removes organic substances on the surface of a silicon wafer or the like.
- the washing liquid preferably has a pH of 11 or less, more preferably adjusts the pH to 9 to 11, particularly preferably 10 to 10.5.
- the H adjustment device 3 can be composed of, for example, a storage tank 23 for storing alkali and a pump 24, and gas dissolution is performed.
- a method of adding and mixing a liquid alkali in the middle of a pipe for supplying a liquid from the tank 2 to the cleaning tank 4 is adopted.
- reference numeral 25 denotes a control valve for adjusting the supply amount of the power.
- the pH adjustment device 3 includes, for example, a gas supply device 26 for supplying an alkaline gas and a gas dissolution tank 27. be able to.
- a gas dissolving tank 27 As the gas dissolving tank 27, a gas dissolving tank having the same structure as the gas dissolving tank 2 for dissolving the ozone gas can be used.
- the alkaline cleaning solution whose pH has been adjusted by the H adjusting device 3 is sent to the cleaning tank 4, but as described above, the cleaning solution is alkaline and has a positive oxidation-reduction potential by dissolving ozone gas. It is necessary to be.
- an oxidation-reduction potential; 11 18; a dissolved ozone concentration meter 31; and a hydrogen ion concentration meter 20 are provided in the middle of the cleaning solution supply pipe 22 for supplying the cleaning solution to the cleaning tank 4, and the oxidation-reduction potential in the cleaning solution is provided.
- the dissolved ozone concentration and the pH can be constantly monitored to control the amount of ozone gas to be dissolved in ultrapure water in the gas dissolution tank 2 and the amount of AL to be added in the PH adjustment device 3. preferable.
- the control device 30 in FIG. 1 controls the amount of dissolved ozone and the amount of added alkali.
- cleaning of metal parts such as silicon wafers in a conflict process, cleaning with sulfuric acid peroxide water and cleaning of the machine with ultrapure water in which only ozone gas is dissolved).
- metal parts such as silicon wafers
- cleaning with sulfuric acid peroxide water and cleaning of the machine with ultrapure water in which only ozone gas is dissolved 'It is possible to remove organic substances on the surface in a shorter time than' contending conventional methods.
- it is used for chemicals used for washing and for rinsing after washing. The cost of chemicals and ultrapure water, and the cost of waste liquid treatment after use can be reduced. This has the effect of reducing the manufacturing cost of parts and members.
- Ichikawa is used to wash silicon wafers and other products and parts.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Cleaning By Liquid Or Steam (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/242,601 US6290777B1 (en) | 1996-08-20 | 1997-08-19 | Method and device for washing electronic parts member, or the like |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23729496A JP3296405B2 (ja) | 1996-08-20 | 1996-08-20 | 電子部品部材類の洗浄方法及び洗浄装置 |
JP8/237294 | 1996-08-20 | ||
JP8/303627 | 1996-10-29 | ||
JP30362796A JP3332323B2 (ja) | 1996-10-29 | 1996-10-29 | 電子部品部材類の洗浄方法及び洗浄装置 |
JP30362696A JP3296407B2 (ja) | 1996-10-29 | 1996-10-29 | 電子部品部材類の洗浄方法及び洗浄装置 |
JP8/303626 | 1996-10-29 | ||
JP2000352815A JP3409849B2 (ja) | 1996-08-20 | 2000-11-20 | 電子部品部材類洗浄用洗浄液の製造装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998008248A1 true WO1998008248A1 (fr) | 1998-02-26 |
Family
ID=47757767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/002852 WO1998008248A1 (fr) | 1996-08-20 | 1997-08-19 | Procede et dispositif pour laver des composants electroniques ou similaires |
Country Status (4)
Country | Link |
---|---|
US (1) | US6290777B1 (ja) |
JP (1) | JP3409849B2 (ja) |
CN (2) | CN1299333C (ja) |
WO (1) | WO1998008248A1 (ja) |
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US6350376B1 (en) | 1999-03-19 | 2002-02-26 | Organo Corporation | Reductive heat exchange water and heat exchange system using such water |
CN102001715A (zh) * | 2010-10-23 | 2011-04-06 | 浙江硅宏电子科技有限公司 | 一种单晶硅片清洗用水的回收利用方法 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0959491A2 (en) * | 1998-05-20 | 1999-11-24 | TDK Corporation | Production method of electronic parts and water treatment apparatus |
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US6271188B1 (en) * | 1998-08-14 | 2001-08-07 | Messer Griesheim Gmbh | Production of ready-to-use solutions |
US6350376B1 (en) | 1999-03-19 | 2002-02-26 | Organo Corporation | Reductive heat exchange water and heat exchange system using such water |
CN102001715A (zh) * | 2010-10-23 | 2011-04-06 | 浙江硅宏电子科技有限公司 | 一种单晶硅片清洗用水的回收利用方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1299333C (zh) | 2007-02-07 |
US6290777B1 (en) | 2001-09-18 |
CN1228197A (zh) | 1999-09-08 |
JP3409849B2 (ja) | 2003-05-26 |
JP2001205204A (ja) | 2001-07-31 |
CN1163946C (zh) | 2004-08-25 |
CN1536623A (zh) | 2004-10-13 |
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