TWI518206B - 銅/鈦系多層薄膜用的蝕刻液 - Google Patents
銅/鈦系多層薄膜用的蝕刻液 Download PDFInfo
- Publication number
- TWI518206B TWI518206B TW100103391A TW100103391A TWI518206B TW I518206 B TWI518206 B TW I518206B TW 100103391 A TW100103391 A TW 100103391A TW 100103391 A TW100103391 A TW 100103391A TW I518206 B TWI518206 B TW I518206B
- Authority
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- Taiwan
- Prior art keywords
- etching
- multilayer film
- copper
- titanium layer
- layer
- Prior art date
Links
- 238000005530 etching Methods 0.000 title claims description 149
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 81
- 239000010949 copper Substances 0.000 title claims description 81
- 229910052802 copper Inorganic materials 0.000 title claims description 81
- 239000010936 titanium Substances 0.000 title claims description 64
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims description 61
- 229910052719 titanium Inorganic materials 0.000 title claims description 61
- 239000007788 liquid Substances 0.000 title description 41
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 60
- 238000000034 method Methods 0.000 claims description 25
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims description 20
- 239000003381 stabilizer Substances 0.000 claims description 15
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 14
- 229910017604 nitric acid Inorganic materials 0.000 claims description 14
- 239000000908 ammonium hydroxide Substances 0.000 claims description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- LUBJCRLGQSPQNN-UHFFFAOYSA-N 1-Phenylurea Chemical group NC(=O)NC1=CC=CC=C1 LUBJCRLGQSPQNN-UHFFFAOYSA-N 0.000 claims description 10
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical group S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 10
- WHOZNOZYMBRCBL-OUKQBFOZSA-N (2E)-2-Tetradecenal Chemical compound CCCCCCCCCCC\C=C\C=O WHOZNOZYMBRCBL-OUKQBFOZSA-N 0.000 claims description 5
- ULRPISSMEBPJLN-UHFFFAOYSA-N 2h-tetrazol-5-amine Chemical group NC1=NN=NN1 ULRPISSMEBPJLN-UHFFFAOYSA-N 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 229940044654 phenolsulfonic acid Drugs 0.000 claims description 5
- 125000002768 hydroxyalkyl group Chemical group 0.000 claims description 4
- 150000005622 tetraalkylammonium hydroxides Chemical group 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 2
- 125000005210 alkyl ammonium group Chemical group 0.000 claims 1
- 230000004888 barrier function Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000126 substance Substances 0.000 description 11
- 239000011521 glass Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229920002120 photoresistant polymer Polymers 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- KJUGUADJHNHALS-UHFFFAOYSA-N 1H-tetrazole Substances C=1N=NNN=1 KJUGUADJHNHALS-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical group F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 125000005208 trialkylammonium group Chemical group 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LSBDFXRDZJMBSC-UHFFFAOYSA-N 2-phenylacetamide Chemical compound NC(=O)CC1=CC=CC=C1 LSBDFXRDZJMBSC-UHFFFAOYSA-N 0.000 description 2
- NSPMIYGKQJPBQR-UHFFFAOYSA-N 4H-1,2,4-triazole Chemical compound C=1N=CNN=1 NSPMIYGKQJPBQR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 150000003851 azoles Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- -1 fluorine ions Chemical class 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 150000003536 tetrazoles Chemical class 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- PVPTUASRAVWKGX-UHFFFAOYSA-N 1,2-dihydrotriazol-3-amine Chemical compound NN1NNC=C1 PVPTUASRAVWKGX-UHFFFAOYSA-N 0.000 description 1
- 229940057054 1,3-dimethylurea Drugs 0.000 description 1
- PWMWNFMRSKOCEY-UHFFFAOYSA-N 1-Phenyl-1,2-ethanediol Chemical compound OCC(O)C1=CC=CC=C1 PWMWNFMRSKOCEY-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- KIZQNNOULOCVDM-UHFFFAOYSA-M 2-hydroxyethyl(trimethyl)azanium;hydroxide Chemical compound [OH-].C[N+](C)(C)CCO KIZQNNOULOCVDM-UHFFFAOYSA-M 0.000 description 1
- VZWOXDYRBDIHMA-UHFFFAOYSA-N 2-methyl-1,3-thiazole Chemical compound CC1=NC=CS1 VZWOXDYRBDIHMA-UHFFFAOYSA-N 0.000 description 1
- LRUDIIUSNGCQKF-UHFFFAOYSA-N 5-methyl-1H-benzotriazole Chemical compound C1=C(C)C=CC2=NNN=C21 LRUDIIUSNGCQKF-UHFFFAOYSA-N 0.000 description 1
- XZGLNCKSNVGDNX-UHFFFAOYSA-N 5-methyl-2h-tetrazole Chemical compound CC=1N=NNN=1 XZGLNCKSNVGDNX-UHFFFAOYSA-N 0.000 description 1
- MARUHZGHZWCEQU-UHFFFAOYSA-N 5-phenyl-2h-tetrazole Chemical compound C1=CC=CC=C1C1=NNN=N1 MARUHZGHZWCEQU-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- MGJKQDOBUOMPEZ-UHFFFAOYSA-N N,N'-dimethylurea Chemical compound CNC(=O)NC MGJKQDOBUOMPEZ-UHFFFAOYSA-N 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- 208000012886 Vertigo Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000000746 allylic group Chemical group 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- AQLJVWUFPCUVLO-UHFFFAOYSA-N urea hydrogen peroxide Chemical compound OO.NC(N)=O AQLJVWUFPCUVLO-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32134—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by liquid etching only
-
- 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
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/18—Acidic compositions for etching copper or alloys thereof
-
- 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
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/26—Acidic compositions for etching refractory metals
-
- 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
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/532—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body characterised by the materials
- H01L23/53204—Conductive materials
- H01L23/53209—Conductive materials based on metals, e.g. alloys, metal silicides
- H01L23/53228—Conductive materials based on metals, e.g. alloys, metal silicides the principal metal being copper
- H01L23/53238—Additional layers associated with copper layers, e.g. adhesion, barrier, cladding layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
- H05K3/067—Etchants
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- ing And Chemical Polishing (AREA)
- Weting (AREA)
Description
本發明係關於含有銅層及鈦層之多層薄膜用的蝕刻液,及使用該多層薄膜用的蝕刻液之蝕刻方法。尤其本發明之蝕刻液適用於在鈦層上設有銅層之多層薄膜的蝕刻。
自以往,一般係使用鋁或鋁合金作為平面顯示器等顯示裝置的配線材料。但是,伴隨著顯示器的大型化及高解像度化,如此的鋁系配線材料,會發生因為配線電阻等特性而引起的訊號延遲的問題,顯示均一的影像有變得困難的傾向。
所以有人探討使用電阻較低的材料即銅或以銅為主成分的配線。但是,銅雖然有電阻低的優點,但是另一方面,當使用在閘極配線時,玻璃等基板與銅的密合性並不足夠,而且當使用在源極‧汲極配線時,會發生有時擴散到成為其基底的矽半導體膜的問題。因此,為了防止此等情形,有人探討兼具與玻璃等基板的密合性高、具有不易擴散到矽半導體膜的阻隔性的搭配金屬的阻隔膜的疊層,就該金屬而言,以鈦(Ti)或氮化鈦(TiN)此類的鈦系金屬受到重視。
含有銅或含有銅為主成分之銅合金的疊層膜,藉由濺鍍法等成膜處理在玻璃等基板上形成,接著經過以光阻等作為遮罩進行蝕刻的蝕刻步驟,成為電極圖案。並且,該蝕刻步驟的方式,有使用蝕刻液之濕式(wet)方式與使用電漿等蝕刻氣體之乾式(dry)方式。在此,於濕式(wet)方式中使用之蝕刻液,要求:(i)高加工精度、(ii)蝕刻殘渣少、(iii)蝕刻的不均度少、(iv)相對於成為蝕刻對象的含銅的配線材料對於金屬的溶解,蝕刻性能為安定等,除此以外,為了因應於顯示器的大型化及高解像度化,要求:(v)獲得蝕刻後的配線形狀在既定範圍內的良好配線形狀。更具體而言,要求:如圖1所示,銅配線端部的蝕刻面與下層基板所成的角度(推拔角)為20~60°的順推拔形狀、從光阻端部至相接於光阻的配線端部為止的距離(頂部CD損失,a×2)為3μm以下,從光阻端部至與設置於配線下方的阻隔膜相接的配線端部為止的距離(底部CD損失,b×2)為1μm以下,且阻隔膜拖尾(tailing)(c)為b以下。
在含有銅或以銅為主成分之銅合金的積層膜的蝕刻步驟使用的蝕刻液,有人提出例如:含有中性鹽、選自於無機酸與有機酸當中至少其一、過氧化氫、過氧化氫安定劑的蝕刻溶液(例如專利文獻1)、含有過氧化氫、有機酸、氟之蝕刻溶液(例如專利文獻2)等。
但是,此等蝕刻溶液蝕刻後的配線形狀均無法令人充分滿意,結果情形為無法充分因應顯示器的大型化及高解像度化。
[專利文獻1]日本特開2002-302780號公報
[專利文獻2]美國專利第7008548號說明書
本發明係有鑑於如此的狀況下而生,目的在於提供一種含有銅層及鈦層之多層薄膜用的蝕刻液,及使用該多層薄膜用的蝕刻液之含有銅層及鈦層之多層薄膜之蝕刻方法。
本案發明人等為了達成前述目的努力研究,結果發現:藉由在蝕刻液摻配(A)過氧化氫、(B)硝酸、(C)氟離子供給源、(D)唑類、(E)第四級氫氧化銨及(F)過氧化氫安定劑的特定組合,可達成該目的。
本發明係基於該見解而完成。亦即,本發明之要旨如下:
[1]一種含有銅層及鈦層之多層薄膜用的蝕刻液,包含:(A)過氧化氫、(B)硝酸、(C)氟離子供給源、(D)唑類、(E)第四級氫氧化銨及(F)過氧化氫安定劑,且pH為1.5~2.5。
[2]如[1]之蝕刻液,其中(C)氟離子供給源為氟化銨及/或酸性氟化銨。
[3]如[1]或[2]之蝕刻液,其中(D)唑類為5-胺基-1H-四唑。
[4]如[1]至[3]中任一項之蝕刻液,其中(E)第四級氫氧化銨為四烷基氫氧化銨及/或(羥烷基)三烷基氫氧化銨。
[5]如[1]至[4]項中任一項之蝕刻液,其中(F)過氧化氫安定劑為苯基脲及/或苯酚磺酸。
[6]如[1]至[5]中任一項之蝕刻液,其中含有(A)過氧化氫4.5~7.5質量%、(B)硝酸3~6質量%、(C)氟離子供給源0.1~0.5質量%、(D)唑類0.1~0.5質量%、(E)第四級氫氧化銨3~6質量%、(F)過氧化氫安定劑0.01~0.1質量%。
[7]如[1]至[6]項中任一項之蝕刻液,其中多層薄膜係在鈦層上疊層有銅層者。
[8]一種含有銅層及鈦層之多層薄膜之蝕刻方法,其特徵在於:使蝕刻對象物與如[1]至[6]項中任一項之蝕刻液接觸。
[9]如[8]之蝕刻方法,其中多層薄膜係在鈦層上疊層有銅層者。
依照本發明,可提供一種蝕刻液、及使用該蝕刻液的含有銅層及鈦層的多層薄膜的蝕刻方法,於含有銅層及鈦層之多層薄膜的蝕刻步驟中,加工精度高、蝕刻殘渣或不均度少,浸浴壽命長,且蝕刻後可獲得良好配線形狀,藉此能因應於顯示器大型化及高解像度化。又,利用該蝕刻方法可一次蝕刻具有含銅層及鈦層的多層薄膜的配線,因此能獲得高生產性,且能使蝕刻後的配線形狀良好。
本發明之蝕刻液,係用於含有銅層及鈦層之多層薄膜之蝕刻,其特徵在於:包含(A)過氧化氫、(B)硝酸、(C)氟離子供給源、(D)唑類、(E)第四級氫氧化銨及(F)過氧化氫安定劑,且pH為1.5~2.5。
本發明之蝕刻液使用的過氧化氫,具有作為氧化劑將銅配線氧化的功能,且在該蝕刻液中的含量較佳為3~10質量%,更佳為4.5~7.5質量%。若過氧化氫的含量在上述範圍內,能確保適當的蝕刻速度,容易控制蝕刻量,且不發生銅配線的局部腐蝕,故為較佳。
本發明之蝕刻液用的硝酸,係貢獻於溶解利用(A)過氧化氫而氧化的銅,在該蝕刻液中的含量,較佳為2~10質量%,3~6質量%更佳。硝酸的含量若在上述範圍內,則能獲得適當的蝕刻速度,且可獲得良好的蝕刻後的配線形狀。
又,本發明之蝕刻液,在不妨礙本發明蝕刻液的效果的範圍,也可使用硝酸以外的無機酸例如磷酸、硫酸等。
本發明之蝕刻液使用的氟離子供給源,貢獻於蝕刻由鈦系金屬構成之阻隔膜,在該蝕刻液中的含量較佳為0.05~1質量%,0.1~0.5質量%更佳。氟離子供給源的含量若在上述範圍內,則能不增大玻璃等基板的腐蝕速度,而可獲得良好的由鈦系金屬構成的阻隔膜的蝕刻速度。
氟離子供給源,只要在蝕刻液中可產生氟離子即可,無特殊限制,但是宜為氫氟酸、氟化銨、酸性氟化銨等,該等可單獨使用或組合多數使用。該等之中,從低毒性的觀點,氟化銨及/或酸性氟化銨更佳。
本發明之蝕刻液使用之唑類,例如:1,2,4-三唑、1H-苯并三唑、5-甲基-1H-苯并三唑、3-胺基-1H-三唑等三唑類;1H-四唑、5-甲基-1H-四唑、5-苯基-1H-四唑、5-胺基-1H-四唑等四唑類;1,3-噻唑、4-甲基噻唑等噻唑類等。該等之中,四唑類較佳,其中又以5-胺基-1H-四唑較佳。
蝕刻液中,唑類的含量較佳為0.05~1質量%,0.1~0.5質量%更佳。若唑類含量在上述範圍內,則可適當控制銅配線的蝕刻速度,能獲得良好的蝕刻後的配線形狀。
本發明之蝕刻液使用的第四級氫氧化銨,較佳為例如四烷基氫氧化銨、(羥烷基)三烷基氫氧化銨。在此,烷基為碳數1~8之直鏈狀、分支狀、環狀任一者均可,例如甲基、乙基、正丙基、異丙基、正丁基、異丁基、第二丁基、第三丁基、各種戊基、各種己基、各種辛基、環戊基、環己基等較佳。該等烷基可相同或不同,從延長浸浴壽命的觀點,碳數1~4的烷基較佳,尤其甲基較佳。亦即,就四烷基氫氧化銨而言,為四甲基氫氧化銨較佳,就(羥烷基)三烷基氫氧化銨而言,(2-羥乙基)三甲基氫氧化銨較佳。又,本發明中,該等可單獨使用或將多數組合使用。
蝕刻液中,第四級氫氧化銨的含量較佳為2~10質量%,3~6質量%更佳。若第四級氫氧化銨的含量在上述範圍內,能使浸浴壽命足夠長。
本發明之蝕刻液含有過氧化氫安定劑。過氧化氫安定劑,只要是通常作為過氧化氫安定劑者即可無限制的使用,但是除了苯基脲、烯丙脲、1,3-二甲基脲、硫脲等脲系過氧化氫安定劑以外,較佳為例如:苯基乙醯胺、苯基乙二醇、苯酚磺酸等,其中又以苯基脲、苯酚磺酸較佳。又,本發明中,該等可以單獨使用或組合多種使用。
本發明之蝕刻液中,(F)過氧化氫安定劑的含量從能充分獲得其添加效果的觀點,以0.01~0.1質量%較佳。
本發明之蝕刻液,需要pH為1.5~2.5。若pH小於1.5,蝕刻速度會變得過快,因此有時會發生銅配線的局部腐蝕,且在銅配線形成蝕刻斑等。又,若pH大於2.5,則(A)過氧化氫的安定性降低,且銅配線的蝕刻速度減低,浸浴壽命也減少。
本發明之蝕刻液,除了上述(A)~(F)成分以外,在不妨礙蝕刻液效果的範圍內,含有水、其他蝕刻液通常使用的各種添加劑。水較佳為利用蒸餾、離子交換處理、過濾處理、各種吸附處理等,而除去金屬離子或有機雜質、微粒粒子等者,尤其純水、超純水較佳。
本發明之蝕刻方法係蝕刻含有銅層及鈦層之多層薄膜,其特徵在於使用本發明之蝕刻液,亦即包含(A)過氧化氫、(B)硝酸、(C)氟離子供給源、(D)唑類、(E)第四級氫氧化銨及(F)過氧化氫安定劑且pH為1.5~2.5的含銅層及鈦層之多層薄膜用的蝕刻液,具有使蝕刻對象物與本發明之蝕刻液接觸的步驟。又,利用本發明之蝕刻方法,可一次蝕刻含有銅層及鈦層之多層薄膜,能獲得蝕刻後的良好配線形狀。
在本發明之蝕刻方法中,作為蝕刻液之蝕刻對象物者,為:在例如圖1所示之玻璃等基板上,將由鈦系材料構成之阻隔膜(鈦層)與由銅或以銅為主成分之材料構成之銅配線(銅層)依序疊層而成的含有銅層及鈦層之多層薄膜上,再塗佈光阻,並將所欲圖案的遮罩進行曝光轉印,顯影而形成所在欲的光阻圖案者。在此,本發明中,包含:含有銅層及鈦層之多層薄膜如圖1所示係在鈦層上存在有銅層的態樣,此外,也包含在銅層之上存在有鈦層之態樣。在本發明之蝕刻方法中,從有效發揮本發明之蝕刻液的性能的觀點,較佳為如圖1所示之在鈦層上存在有銅層的蝕刻對象物。又,如此之含有銅層及鈦層的多層薄膜,為在平面顯示器等顯示裝置等的配線中較佳可使用者。是以,在鈦層上存在有銅層的蝕刻對象物,從利用領域的觀點,也是較佳態樣。
銅配線只要是由銅或以銅為主成分之材料形成即可,無特別限制,形成該阻隔膜之鈦系材料,例如:Ti(鈦)及其氮化物TiN(氮化鈦)。
使蝕刻對象物與蝕刻液接觸的方法無特殊限制,可採用例如利用滴加蝕刻液(單片旋轉處理)或噴塗等形式而使其接觸對象物的方法,或使對象物浸泡於蝕刻液之方法等濕式(wet)蝕刻方法。本發明中,較佳為採用將蝕刻液噴塗於對象物而使其接觸的方法。
蝕刻液的使用溫度,較佳為10~70℃,尤其20~50℃較佳。蝕刻液的溫度若為10℃以上,蝕刻速度不會變得過慢,因此,生產效率不會顯著降低。另一方面,若為70℃以下的溫度,則可抑制液組成改變,並保持蝕刻條件為一定。藉由提高蝕刻液的溫度,雖然蝕刻速度會上升,但是,考慮將蝕刻液的組成改變抑制為小等,適當決定最適的處理溫度即可。
本發明之蝕刻方法中,在蝕刻液中含有的(A)過氧化氫及(B)硝酸,會當做由上述各銅配線的氧化劑而消耗,又,(B)硝酸也會由於溶解經氧化的銅而消耗,因此有時會因為使用的蝕刻液中的(A)過氧化氫及(B)硝酸的濃度降低造成蝕刻液的性能降低。於如此的情形中,藉由適當地將(A)過氧化氫及(B)硝酸同時或分別添加,可延長浸浴壽命。
以下利用實施例對於本發明更詳細說明,但本發明不限於該等實施例。
將實施例及比較例獲得之已進行蝕刻後的含有銅層及鈦層的多層薄膜試樣切斷,使用掃描型電子顯微鏡(「S5000H型(型號)」;日立製),以觀察倍率50000倍(加速電壓2kV、加速電流10μA)進行觀察。依據獲得的SEM影像,得到圖1所示的推拔角、頂部CD損失(μm)、底部CD損失(μm)及阻隔膜拖尾(μm)。
若推拔角、頂部CD損失(μm)、底部CD損失(μm)及阻隔膜拖尾(μm),在表1記載的基準範圍內則判定為合格,而進行蝕刻液的性能判斷。又,表中的初浴,係指銅未溶解於蝕刻液的狀態,金屬溶解時,係指於後述浸浴壽命的評價中,銅在蝕刻液中的溶解量為可容許之最大溶解量時。
進行蝕刻,將推拔角、頂部CD損失(μm)、底部CD損失(μm)及阻隔膜拖尾(μm)當中任一者即將落出表2所示基準範圍外之前,銅在蝕刻液中的溶解量定為可容許之溶解量,並評價浸浴壽命。
對於實施例及比較例獲得之試樣,以接觸式粗糙度計(「SV-2100(型號)」;MITUTOYO製)測定腐蝕部與非腐蝕部的高低差,並求取腐蝕速度。
以玻璃當做基板,濺鍍鈦(Ti),並形成由鈦構成的阻隔膜(鈦層),接著,濺鍍以銅為主成分的材料,並將配線材料成膜(銅層),接著,塗佈光阻,將圖案遮罩進行曝光轉印後,顯影而形成配線圖案,製作在鈦層上疊層有銅層之含有銅層及鈦層之多層薄膜。
將製作例獲得之含有銅層及鈦層之多層薄膜,使用表2所示之蝕刻液,於35℃進行60~150秒蝕刻,獲得蝕刻後之含有銅層及鈦層之多層薄膜試樣,測定此時在蝕刻液中的金屬溶解量。對於獲得的試樣,依照上述方法,得到初浴時之推拔角、頂部CD損失(μm)、底部CD損失(μm)及阻隔膜拖尾(μm)。當該等數值在表1的基準範圍內時,對於製作例得到的新的含有銅層及鈦層的多層薄膜進一步蝕刻。當得到的試樣的推拔角、頂部CD損失(μm)、底部CD損失(μm)及阻隔膜拖尾(μm)在表1的基準範圍內時,反複進行新的含有銅層及鈦層的多層薄膜的蝕刻,當該等數值當中任一者的值在表1的基準範圍外的時點,結束蝕刻處理,測定該等數值全部在基準範圍內的最後一次使用的蝕刻液中的金屬溶解量,以該等作為蝕刻液中銅的可容許最大溶解量,進行浸浴壽命的評價。得到的評價如表2、3所示。
* 1,三菱瓦斯化學(股)公司製
* 2,和光純藥工業(股)公司製
* 3,酸性氟化銨,森田化學工業(股)公司製
* 4,5-胺基-1H-四唑,和光純藥工業(股)公司製
* 5,四甲基氫氧化銨,多摩化學工業(股)公司製
* 6,苯基脲,和光純藥工業(股)公司製
* 7,氟化銨,森田化學工業(股)公司製
* 8,氫氟酸,森田化學工業(股)公司製
* 9,1,2,4-三唑,和光純藥工業(股)公司製
* 10,(2-羥乙基)三甲基氫氧化銨,和光純藥工業(股)公司
* 11,苯酚磺酸,和光純藥工業(股)公司製
實施例1中的蝕刻液使用表4所示配合,除此以外與實施例1同樣進行蝕刻。對得到的含有銅層及鈦層的多層薄膜進行推拔角、頂部CD損失(μm)、底部CD損失(μm)、阻隔膜拖尾(μm)、浸浴壽命的評價及玻璃腐蝕的評價,如表4所示。
*12,三菱瓦斯化學(股)公司製
*13,和光純藥工業(股)公司製
使用本發明之蝕刻液的實施例,於蝕刻後的配線形狀良好,且浸浴壽命、玻璃腐蝕的評價均呈現優異的結果。另一方面,使用不含(E)及(F)成分的蝕刻液的比較例1,玻璃腐蝕雖然受抑制,但是浸浴壽命變短,為500ppm,比起實施例中為2500ppm以上、3000ppm以上或4000ppm以上的長浸浴壽命,未令人滿意。使用不含(E)成分、pH落在本發明之規定範圍外的蝕刻液的比較例2,蝕刻速度過快,產生蝕刻斑,無法均勻蝕刻,配線形狀亦差,無法測定推拔角或CD損失等。使用不含(D)成分的蝕刻液的比較例3,蝕刻速度快,無法控制配線形狀,尤其,CD損失變差。使用pH為2.8的落於本發明之規定範圍外的蝕刻液的比較例4,浸浴壽命變短。使用不含(E)成分的蝕刻液的比較例5,與比較例2同樣,蝕刻速度過快,會產生蝕刻斑,無法均勻蝕刻,配線形狀亦差,無法測定推拔角或CD損失等。又,與比較例5同樣使用不含(E)成分的蝕刻液的比較例6,推拔角或CD損失之值為良好,但是浸浴壽命變短。
本發明之蝕刻液,可理想地使用在含有銅層及鈦層之多層薄膜,特別是在鈦層上疊層有銅層的多層薄膜的蝕刻。使用該蝕刻液的蝕刻方法,能一次蝕刻具有含銅層及鈦層的多層薄膜的配線,且蝕刻後的配線形狀良好,因此能達成高生產性。
圖1顯示使用本發明之蝕刻液蝕刻時,具有含銅層及鈦層之多層薄膜的配線剖面的示意圖。
Claims (8)
- 一種含有銅層及鈦層的多層薄膜用的蝕刻液,包含(A)過氧化氫4.5~7.5質量%、(B)硝酸3~6質量%、(C)氟離子供給源0.1~0.5質量%、(D)唑(azole)類0.1~0.5質量%、(E)第四級氫氧化銨3~6質量%及(F)過氧化氫安定劑0.01~0.1質量%,且pH為1.5~2.5。
- 如申請專利範圍第1項之含有銅層及鈦層的多層薄膜用的蝕刻液,其中(C)氟離子供給源為氟化銨及/或酸性氟化銨。
- 如申請專利範圍第1或2項之含有銅層及鈦層的多層薄膜用的蝕刻液,其中(D)唑類為5-胺基-1H-四唑。
- 如申請專利範圍第1或2項之含有銅層及鈦層的多層薄膜用的蝕刻液,其中(E)第四級氫氧化銨為四烷基氫氧化銨及/或(羥烷基)三烷基氫氧化銨。
- 如申請專利範圍第1或2項之含有銅層及鈦層的多層薄膜用的蝕刻液,其中(F)過氧化氫安定劑為苯基脲(phenylurea)及/或苯酚磺酸(phenolsulfonic acid)。
- 如申請專利範圍第1或2項之含有銅層及鈦層的多層薄膜用的蝕刻液,其中多層薄膜係在鈦層上疊層有銅層者。
- 一種含有銅層及鈦層的多層薄膜的蝕刻方法,其特徵為:使蝕刻對象物與如申請專利範圍第1至5項中任一項之含有銅層及鈦層的多層薄膜用的蝕刻液接觸。
- 如申請專利範圍第7項之含有銅層及鈦層的多層薄膜的蝕刻方法,其中多層薄膜係在鈦層上疊層有銅層者。
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