TW589687B - Manufacturing method of semiconductor device and semiconductor manufacturing device - Google Patents
Manufacturing method of semiconductor device and semiconductor manufacturing device Download PDFInfo
- Publication number
- TW589687B TW589687B TW092102879A TW92102879A TW589687B TW 589687 B TW589687 B TW 589687B TW 092102879 A TW092102879 A TW 092102879A TW 92102879 A TW92102879 A TW 92102879A TW 589687 B TW589687 B TW 589687B
- Authority
- TW
- Taiwan
- Prior art keywords
- copper
- wiring
- film
- etching
- metal
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000010949 copper Substances 0.000 claims abstract description 153
- 229910052802 copper Inorganic materials 0.000 claims abstract description 153
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 152
- 229910052751 metal Inorganic materials 0.000 claims abstract description 94
- 239000002184 metal Substances 0.000 claims abstract description 94
- 238000005530 etching Methods 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 59
- 239000000243 solution Substances 0.000 claims abstract description 45
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000001590 oxidative effect Effects 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims description 32
- 239000000126 substance Substances 0.000 claims description 25
- 238000007747 plating Methods 0.000 claims description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 239000007800 oxidant agent Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 6
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 5
- 150000002736 metal compounds Chemical class 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 2
- 229910000365 copper sulfate Inorganic materials 0.000 claims 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims 1
- 229940079593 drug Drugs 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract description 72
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 56
- 229910021529 ammonia Inorganic materials 0.000 abstract description 27
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract description 23
- 239000005751 Copper oxide Substances 0.000 abstract description 23
- 229910000431 copper oxide Inorganic materials 0.000 abstract description 23
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract description 19
- 239000011259 mixed solution Substances 0.000 abstract description 9
- 239000003513 alkali Substances 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000011229 interlayer Substances 0.000 description 40
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 32
- 239000010410 layer Substances 0.000 description 23
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 20
- 235000011114 ammonium hydroxide Nutrition 0.000 description 16
- 235000012431 wafers Nutrition 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000009413 insulation Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- -1 tungsten nitride Chemical class 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000002411 adverse 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
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- HSINOMROUCMIEA-FGVHQWLLSA-N (2s,4r)-4-[(3r,5s,6r,7r,8s,9s,10s,13r,14s,17r)-6-ethyl-3,7-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1h-cyclopenta[a]phenanthren-17-yl]-2-methylpentanoic acid Chemical compound C([C@@]12C)C[C@@H](O)C[C@H]1[C@@H](CC)[C@@H](O)[C@@H]1[C@@H]2CC[C@]2(C)[C@@H]([C@H](C)C[C@H](C)C(O)=O)CC[C@H]21 HSINOMROUCMIEA-FGVHQWLLSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 241001137069 Ficus aspera Species 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- 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 1
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 description 1
- 206010029412 Nightmare Diseases 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- UOTBHSCPQOFPDJ-UHFFFAOYSA-N [Hf]=O Chemical compound [Hf]=O UOTBHSCPQOFPDJ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 235000004279 alanine Nutrition 0.000 description 1
- 235000001014 amino acid Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000003613 bile acid Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—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
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
- H01L21/76849—Barrier, adhesion or liner layers formed in openings in a dielectric the layer being positioned on top of the main fill metal
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/63—Treatment of copper or alloys based thereon
-
- 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
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
- H01L21/02074—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers the processing being a planarization of conductive layers
-
- 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
- H01L21/02082—Cleaning product to be cleaned
- H01L21/02087—Cleaning of wafer edges
-
- 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
- H01L21/02082—Cleaning product to be cleaned
- H01L21/0209—Cleaning of wafer backside
-
- 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
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
-
- 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
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76865—Selective removal of parts of the layer
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
- H01L21/76883—Post-treatment or after-treatment of the conductive material
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76885—By forming conductive members before deposition of protective insulating material, e.g. pillars, studs
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76886—Modifying permanently or temporarily the pattern or the conductivity of conductive members, e.g. formation of alloys, reduction of contact resistances
- H01L21/76888—By rendering at least a portion of the conductor non conductive, e.g. oxidation
Landscapes
- Engineering & Computer Science (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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Electrodes Of Semiconductors (AREA)
- Weting (AREA)
Description
589687 ⑴ 玖、發_說明 (發明說明應敘明:發明所屬之技術領域、先前技術、内容、實施方式及圖式簡單說明) 【發明之技術領域】 本發明是半導體積體電路之半導體裝置及有關半導體 裝置配線用之銅膜加工及其配線構造之製造方法。 【先前技術】 現在半導體積體電路之半導體裝置用銅或以銅為主要 成分之材料配線。銅原子擴散至絕緣膜甚至半導體基板 上,為了防止因此產生之錯誤動作,通常是用氮化鈦、氮 化鈕、氮化鎢等障壁金屬包住銅膜以隔絕絕緣層。 如圖13(a)所示,在半導體基板上形成之配線通常是埋 在絕緣膜上之配線溝裡。圖13是半導體基板之側面圖。積 體電路等之半導體元件是在以矽做成的半導體基板100上 形成矽氧化膜之層間絕緣膜101,在其表面形成配線溝。 在此配線溝之侧壁形成TiN或TaN等障壁金屬102,銅膜103 或以銅為主要成分之合金膜埋入其中。 如此以往配線部分的銅會經由沒有障壁金屬之上方擴 散至層間絕緣膜,對在半導體基板100上形成之半導體元 件有不良影響。又因為在層間絕緣膜101及埋入其中之銅 膜103表面以CMP法平坦化所以在刻版印刷時會產生圖形 蝕刻無法辨識之圖形。
589687 針對此問題以蝕刻的方法將配線部分即銅膜103上方除 , 去,使其如圖13(b)所示較層間絕緣膜101表面低。如此可 使圖形對合。 又如圖13(c)所示在其上方覆蓋一層障壁金屬104或其他 覆蓋層,如此可以防止銅從上部擴散。若覆蓋層用導電材 料則上層之配線和其穿孔配線(接觸配線)形成時因銅不 會直接暴露在蝕刻之環境中,故可降低發生腐蝕或因蝕刻 φ 而斷線之危險。 【發明所欲解決之課題】 如前所述以往形成配線溝構造的方法有溼式蝕刻法和 乾式蝕刻法。乾式法又分成非等方向蝕刻之RIE (Reactive Ion Etching)法及等方向姓刻之 CDE (Chemical Dry Etching)法。 用此方法雖可以進行銅蝕刻但對地球的環境有不良影 響。如在乾式法中使用CF系的氣體。溼式法要除去在蝕刻 φ 後堆積的副產品,相對的溼式處理在工程上及成本上有較 多的問題。 在此將重點放在溼式蝕刻。銅幾乎不溶於鹽酸、氟酸、 稀硫酸、醋酸、氫氰酸等氧化力較弱的酸但會被具氧化力 之酸姓刻。如熱濃硫酸、硝酸、亞硝酸、磷酸等。又可溶 解於如鹽酸+過氧化氫水、鹽酸+臭氧水、氟酸+過氧化氫 水之類的過氧化氫、臭氧或氧等具氧化力之混合液。也會 589687 (3)
以和銅錯合成可溶性錯合體的物質如氨、帶有胺基的 被θ 二肤等)、氰化物(KCN)等独刻。將這物質和過氧 〆火等混合強化氧化力通常可以加速蝕刻。 適常氨水和過氧化氫水及鹽酸和過氧化氫水的混合液 θ々做洗淨用的藥液’分別稱為SC1、SC2 ° 一般市售的氨 是w 、藥緣、或過氧化氫水的濃度約為20〜35%,和純水以 水、 5—1:1:7的比例混合調製SCI、SC2。將銅浸泡在此條件 1 * * A溶液進行蝕刻。 下的;必0 供是前述條件下用SC1、SC2姓刻銅,將使銅表面白濁化 原有的光澤。若用硝酸或熱硫酸等前述之各種藥液蝕 刻時也會使銅表面白濁’而且溫度愈高愈顯著。因蝕刻使 鈉表面粗糙造成膜厚度不一。用在配線時產生實質電阻上 并、和上層之配線接觸不良等問題。因此儘量使表面保持 平滑是独刻的必要條件。 提出將銅膜氧化再以酸等除去氧化物之銅蝕刻方法。如 特開平2-306631號公報提出在銅膜注入氧離子後回 承α用 氧電聚處理方法等生成氧化物再用稀硫酸或醋酸之蚀刻 方法。又如特開平10_233397號公報提出在擴散爐H壞 或烤箱内將銅膜曝曬在室溫以上之氧或臭氧形成鋼氧i 膜再用稀鹽酸或稀硫酸以溼蝕刻、乾蝕刻、或CMp等除去 万法。但是用這些方法姓刻後的銅表面多半粗糙。特別是 -7- (4)
在為使氧化 本發明是 的氧化物蝕 精度良好。 導體裝置之 【課題之解 本發明之 及過氧化氫 氧化膜,然| 銅氧化膜選 後本應該將 SCI使含有肩 氧化力較弱 用甘氨酸或 合體溶解,3 蚀刻。 像這樣以 後不會造成 價之藥液在 面形成一安 換言之本 膜加厚提高溫度時問題更嚴重。 為了減少這些問題。以酸或鹼除去銅膜氧化後 刻銅膜方法可減少銅膜表面粗糙,工時減少且 提供銅氧化膜之形成方法、銅膜蝕刻方法、半 製造方法、及半導體裝置。 決手段】 特徵為在銅配線時將銅暴露於〜之氨水 水之混合液(SCI),表面形成含有氨錯合體之 I以稀鹽酸等氧化力較弱的酸或稀氨水等鹼將 擇性蝕刻。在PH=8〜1〇溶液中浸泡氧化膜形成 銅進行蝕刻,為了加速蝕刻再浸入阳^⑺〜“之 L錯合體之氧化膜成長加厚然後再以稀鹽酸等 的酸或稀氨水等鹼將銅氧化膜選擇性蝕刻。或 丙氨酸等中性胺基酸水溶液將和銅形成之錯 隹然在中性溶液中仍可將銅氧化膜進行選擇性 形成氧化膜及姓刻之處理方法使從來銅蝕刻 表面粗糙是困難的方法變成可行。以安全且廉 短時間内氧化及姓刻銅,結果在配線構造的表 定障壁金屬。 發明之特徵為將銅膜表面和pH=8〜1〇或pH=:9〜1〇
589687 之氨水及過氧化氫水之混合液接觸,形成含有氨錯合體之 / 氧化膜之步騾。或將銅膜表面和pH=8〜10或pH=9〜10之氨水 及過氧化氫水之混合液接觸,形成含有氨錯合體之氧化膜 之步騾。以及前述形成氧化膜之銅膜暴露在pH=10〜11之氨 水及過氧化氫水之混合液之步驟。又發明之銅氧化膜之形 成方法是以過氧化氫水在銅膜表面形成氧化膜之步騾。前 述形成氧化膜後的銅膜再暴露於pH=10〜11之氨水及過氧 0 化氫水之混合,形成含有氨錯合體之氧化膜之步驟。 前述銅氧化膜之形成方法是首先使銅膜和pH=8〜10或 pH= 9〜10之氨水及過氧化氫水之混合液接觸,在前述表面 形成銅氧化膜,最後再暴露在pH=10〜11之氨水及過氧化氫 水之混合液,其間可多階段斷續調整pH或連續調整pH。 本發明銅膜之蝕刻方法,其特徵在備有以上述任一種銅 氧化膜之形成方法在銅膜表面形成含銅之氨錯合體的銅 φ 氧化膜之步騾,以及自上述銅膜選擇性地除去上述銅之氧 化膜之步騾。上述銅之氧化膜可以酸或鹼除去。 本發明之半導體裝置之製造方法,其特徵為具有埋入在 半導體基板之絕緣膜上形成之配線溝或接觸孔配線或接 觸配線之銅膜之步騾,以前述任一種銅氧化膜之形成方法 在前述銅膜上形成含氨錯合體之銅氧化膜之步騾,及將前 述銅氧化膜從前述銅膜上選擇性除去之步驟。可以在除去 (6) (6)589687 前述銅氧化膜後之銅膜表面蝕刻如配線溝或接觸孔侧璧 附近區域相同深度,也可在前述配線溝或接觸孔上形成金 屬膜表面做為障壁金屬,也可以在除去前述銅氧化膜後之 銅膜表面前述鋼膜上形成再加上一層障壁金屬,也可以在 i述配線溝或接觸孔或配線溝及接觸孔和前述埋入之銅 膜足間介有<前述障壁金屬和前述銅膜上形成之前述障 壁金屬不同材質所構成,也可以將除去前述銅氧化膜後之 銅膜表面暴露於氨水,也可將前述半導體基板以1〇〇〇 rpm 以上1600 rpm以下之條件下將銅膜表面暴露在氨水中。 又本發明 < 半導體裝置之製造方法,其特徵為具有在半 ;心基板之絕緣膜上形成之配線溝或接觸孔上堆積金屬 乂充真配”泉溝或接觸孔之步騾,及研磨前述配線金屬以露 出前述絕緣膜之步驟,及前述半導體基板之洗淨之步驟及 則述凹蝕之步驟,埋入在前述配線溝或接觸孔之前述配線 金屬表面凹蝕之步驟,前述研磨步騾、前述洗淨步騾、及 前述再蚀刻步驟中至少兩種步驟所用的藥液主要成分相 同。 又本發明心半導體裝置之製造方法,其特徵為具有在半 導體基板上堆冑金屬《金屬4匕合物之步冑,及蚀刻前述金 屬或金屬化合物不要部分之步驟,及前述金屬<金屬化合 物堆積足步騾中包含足鍍敷步騾,前述鍍敷步騾使用之鍍 589687 ⑺
敷 液如鍍敷對像成分及鹼或形成錯合體的成 分和前述姓 刻除去之步騾所用的藥液之主要成分相同,在前述藥液中 添加之氧化劑可以用過氧化氫水或臭氧水,在前述藥液中 之主要酸成分以用硫酸或氫氰酸,前述不要部分蝕刻除去 之步驟後之前述藥液中之氧化劑除去之步驟,及前述藥液 中之金屬離子濃度和前述鍍敷液中之金屬離子濃度幾乎
相同之步騾,更可以將前述氧化劑除去之藥液當做鍍敷 液0 又本發明之半導體之製造裝置是以前述半導體裝置之 製造方法,其特徵為除去包含在前述藥液之氧化劑之手 段,將前述藥液中之金屬離子濃度調成和前述鍍敷液中之 金屬離子濃度大致相同之手段,將除去前述氧化劑之藥液 當成鍍敷液使用之手段》 本發明之半導體裝置,其特徵為在半導體基板及埋在前 述半導體基板上之絕緣膜形成之配線溝或接觸孔之金屬 膜,在前述配線溝或接觸孔上形成金屬膜表面做為障壁金 屬,前述金屬膜表面蝕刻如配線溝或接觸孔侧璧附近區域 相同深度。前述金屬膜也可介有之前述障壁金屬埋入在前 述配線溝或接觸孔,形成被覆在前述金屬膜表面上之前述 障壁金屬也可以當成埋入在前述配線溝或接觸孔之構 造,即銅膜等金屬膜表面愈接近侧壁蝕刻量愈多,變成所 -11 - 589687 ⑻ ,· 謂配線肩滑落斷面形狀。 Λ 因此在其上形成之障壁金屬愈接近配線溝侧壁膜愈 厚。像這樣的形狀,實施本發明有更多的優點。例如為形 成接觸配線在障壁金屬上形成接觸孔,及因形成接觸孔蝕 刻區域對合偏差一部分進入層間絕緣膜。在此狀態蝕刻被 覆在下層配線之障壁金屬之層間絕緣層矽氧化膜等之層 間絕緣膜之蝕刻率較銅膜等之金屬膜之蝕刻率為大因此 φ 進行層間絕緣之蝕刻在這部分蝕刻較多。配線肩滑落的情 形是較深部分的徑較平坦部分的徑為大因此這部分之方 位比低,較容易堆積障壁金屬或銅膜層。而且形成接觸孔 不限於埋入障壁金屬。 【發明之實施形態】 以下參照圖面說明發明之實施形態。 本發明適用於半導體裝置之多層配線構造,例如穿孔程 φ 序、單金屬鑲嵌構造、及雙金屬鑲嵌構造。 (1)有關穿孔程序 圖1是形成多層配線之半導體基板之剖面圖。以此程序 “ 形成之穿孔配線(或稱接觸配線)是將上層配線及下層配 線連接之配線。如圖1所示形成埋在下層絕緣膜上之下層 配線。積體電路等之半導體元件是在以矽做成的半導體基 板10上形成矽氧化膜之層間絕緣膜1,在其表面形成配線 -12- (9) (9)589687 溝。在此配線溝之侧爲·泌4 T XT XT r、 」土形成TaN、WN、TiN等導電性氮物障 壁金屬2,銅膜3或以鋼、 J為王要成分<合金膜埋入其中。此 時障壁金屬2僅在配線冑 霉 < 中存在並沒有在層間絕緣膜1 之表面上形成(圖1(a))。也 t」以婿障壁金屬越過層間絕緣 膜之配線溝預先在其表而 衣面形成。然後將銅膜3表面蝕刻使 銅膜較層間絕緣膜1之表面為低(圖i(c))。 如此在配線溝之上部以賤鍍或CVD等方法將障壁金屬 堆積上去,再以CMP法研磨在配線之上部嵌入一層障壁金 屬4。障壁金屬4之材料可以和障壁金屬2相同也可以不同 (圖1(d))。然後將鎢等之障壁金屬鋁膜7及依須要依序 加上導電蝕刻斷阻8(圖2(a)),將此圖樣化後形成穿孔配線 9(圖2(b))。然後在層間絕緣層i之上將穿孔配線9以矽氧 化膜等形成之層間絕緣層11被覆(圖3(a))。以CMp法將此 層間絕緣層11研磨露出穿孔配線9。其次在層間絕緣層i i 上堆積上層之層間絕緣層12 ’然後再埋入上層配線。上層 配線是由障壁金屬13、埋在配線溝裡的銅膜14及被覆在此 銅膜14表面之障壁金屬15所構成(圖3 (b))。此穿孔配線9用 來連接上下層配線使其通電·。本發明適用於在此穿孔程序 中形成障壁金屬4、15。即例如障壁金屬4之形成方法(參 照圖1)將埋在絕緣膜1之銅膜3露出之表面氧化形成銅氧 化膜5(圖1(b))。再用蚀刻法除去銅氧化膜形成不會粗糙 -13- 589687
(ίο) (不會白濁)的表面,在此表面再形成障壁金屬圖1(c))。 (2)有關單金屬鑲嵌 圖4是形成多層配線之半導體基板之剖面圖。在半導體 基板2〇上矽氧化膜等層間絕緣膜21、25、29等依次堆積形 成。在各層間絕緣膜21、25、29形成配線溝、接觸孔等, 在其中分別形成下層配線、接觸配線、上層配線等。因為
在所有的層間絕緣膜上形成配線溝或接觸孔,在其内部及 層間絕緣膜表面上形成障壁金屬,然後在其上堆積銅或以 銅為王成分之合金膜,再用CMp等方法研磨使其表面平 坦,將以障壁金屬包裹的銅膜埋入配線溝或接觸孔。然後 依本發明將銅膜表面氧化再用蝕刻除去銅氧化膜形成不 會粗糙(不會白濁)的表面,然後再在此表面形成障壁金 屬。即本發明適用於半導體裝置之多層構造形成障壁金屬 24 - 28 - 32 〇
埋在層間絕緣膜21之下層配線是埋在形成於配線侧壁 之障壁金屬22、配線溝裡被障壁金屬22包裹的銅膜、及 被覆在銅膜23上之障壁金屬24所構成。和下層配線做電的 接續’在層間絕緣膜25埋入之接觸配線是由埋在形成於配 線側壁之障壁金屬26、配線溝裡被障壁金屬26包裹的鋼膜 27、及被覆在銅膜27上之障壁金屬28所構成。和接觸配線 做電的接續’在層間絕緣膜29埋入之接觸配線是由埋在形 -14- 589687 m 成於配線側壁之障壁今屬、肅始、兹、 土金屬30、配線溝裡被障壁金屬%包裹 的銅膜31、及被覆在銅膜31上之障壁金屬”所構成。 因在下層配線之銅膜23形成障壁金屬24可以抑制銅從 配線上部擴散。又因表面較光滑表面分布不均等影響少, 實質電阻小。又可抑制形成接觸後之電荷集中因此不易發 生電子移動。 C3)有關雙金屬鑲嵌 圖5是形成多層配線之半導體基板之剖面圖。在半導體 基板40上矽乳化膜等之層間絕緣膜41、化等依次堆積形 成。在各層間絕緣膜41、45形成配線溝、接觸孔等,在其 中分別形成下層配緩技總两* ^接觸配線、上層配線等。所有的構 造都和早金屬鑲嵌相同,因為在所有的層間絕緣膜上形成 配線溝或接觸孔,在其内部及層間絕緣膜表面上形成障壁 金屬然後在其上堆積銅或以鋼為主成分之合金膜,再用 CMP寺万法研磨使其表面平坦,將以障壁金屬包裹的鋼膜 埋入配線溝或接觸孔。然後依本發明將銅膜表面氧化再用 蝕刻除去銅氧化膜形成不會粗糙(不會白濁)的表面,然後 再在此表面形成障壁金屬。即本發明適用於半導體裝置之 多層構造形成障壁金屬44、48。 埋在層間絕緣膜41之下層配線是埋在形成於配線側壁 之障土金屬42、配線溝裡被障壁金屬42包裹的銅膜43、及 -15 - 589687
(12) 被覆在銅膜43上之障壁金屬44所構成。和下層配線介隔一 接觸配線做電的接績,在層間絕緣膜45埋入之接觸配線是 由埋在形成於配線侧壁之障壁金屬46、配線溝裡被障壁金 屬46包裹的銅膜47、及被覆在銅膜47上之障壁金屬48所構 成。使用本發明方法可得到和單金屬鑲嵌同樣的效果。 以下說明適用於本發明之半導體裝置形成多層配線構 造以上之實施例。
首先參照圖6至圖8說明第1實施例 本發明之特徵是發現一不會造成表面粗糙之銅膜蝕刻 方法。在銅膜表面形成一含氨錯合之氧化膜’然後用蝕刻 法將其除去。具體而言,不是先蝕刻銅而是先調整 或PH=9〜K)之氨水及過氧化氫水之混合液使銅膜表面形成 比較厚的氧化膜,然後用稀鹽酸等沒有氧化力的酸或稀氨
水等鹼將此氧化膜蝕刻除去之方法。如前所述,通常用氨 ο it 合液⑽)#刻飼時將調至 —依本發明之實驗得知仲在1〇以下表面會形成氧化 膜,超過10銅將被蝕刻等特性。 在此浸泡在調整阳後的SC1 ^分鐘使其表面形成氧化 膜’用稀鹽酸選…刻此氧化膜時销之钱刻量如圖6所 示。圖6之縱轴表示蚀刻量(一,橫轴表示pH。如圖6所示 銅表面浸泡在約18%之過氧化氫㈣成氧㈣, -16- 589687
(13)
刻量約4 nm。然而加入氨水中和pH=7時幾乎沒有氧化,再 加入更多的氨水,當pH超過8時蝕刻量增加,pH=10約11〜12 nm。pH超過10產生深藍色的氨錯離子溶解。圖7(a)是處理 前之銅表面,(b)是在pH= 9.5之氨水及過氧化氫水混合液 氧化1分鐘後用鹽酸蝕刻後之銅表面。圖8(a)是在pH=10. 2 之氨水及過氧化氫水混合液姓刻後之銅表面。對照參考圖 8(b)是鹽酸及過氧化氫水混合液(80°C )蝕刻後銅表面之 SEM像。從圖得知用調整pH後的氨水及過氧化氫水可得到 表面不會粗糙:之姓刻方法。
為了在微影蝕刻時位置可以確實對合期望有30〜50 nm的 蝕刻,同時也期望蝕刻時間儘量縮短。只用過氧化氫水處 理可以得到較厚的氧化膜,蝕刻50 nm須要12〜13分鐘的處 理時間。因此用pH=8〜10,最好是pH=9〜10的溶液處理。尤 其是pH= 10附近的溶液處理50 nm的蚀刻只要4分鐘。 然而不是只有調整pH值就可以,如圖6所示,例如將銅 浸泡在PH調到9〜10. 5之過氧化氫水和KOH之混合液或過氧 化氫水和膽酸之混合液也幾乎不會氧化。這顯示用氨的重 要性。 以下說明第2實施例。 如第1實施例所述銅的蝕刻量最好是在30〜50 nm。然而將 銅浸泡在pH=10之SCI 1分鐘只能得到12 nm的蝕刻。在本實 -17- 589687
(14) 施例將說明再增加姓刻量表面又不會粗糙的方法。一旦浸 · 泡在只有過氧化氫水溶液或pH= 8〜10之.SCI之銅膜表面形 成氧化膜,接著再將此銅膜浸泡在pH=10〜11之SCI。通常 pH=10〜11是蝕刻的條件,因為在表面已預先形成氧化膜故 可以形成更厚的氧化膜。 例如過氧化氫水(35%):氨水(35%):純水=10: 3:100之混合 比混合成pH=10之溶液,將銅膜浸泡在此溶液30秒後接著 | 將組成比改變成1 : 1 :10 (pH= 10.5),再浸泡1分30秒在銅膜上 形成更厚的氧化膜,然後再用稀鹽酸只將含氨錯合體之氧 化膜姓刻,銅蚀刻量可達50 nm。在此浸泡在第1實施例的 溶液中處理時間合計2分鐘約可得到2倍的蝕刻量,可縮短 處理時間。 以下參照圖9及圖1〇說明第3實施例。 在本實施是以例如圖1埋入之銅配線或圖3至圖5所示下 層配線為對像蝕刻實際的銅配線。浸泡在ρΗ=10之SCI(過氧 氫水.氣水:純水=10: 3 :100) 1分鐘後再用20%鹽酸稀釋50倍 〈稀鹽酸將表面之氧化膜除去,如此反復三次將銅蝕刻約 3 5 4. ο e p * 历的0·25 M m線和空間配線之剖面圖如圖9所示。在 圖9中半導體基板50上形成層間絕緣膜5〖。在層間絕緣膜 上形成障壁金屬52,在其侧壁上堆積配線溝54,銅膜& 里入此配線溝54。對這種構造的銅配線用上述方法形成氧 -18-
589687 化膜再蝕刻處理形成不粗糙的表面,然後在這不粗糙的表 : 面用濺鍍法或CVD等方法將TaN或WN等堆積第2障壁金 屬,CMP等方法形成障壁金屬55。 如圖9所示蝕刻銅鍈53形成不粗糙的表面,愈靠近配線 溝54蝕刻量愈多,變成所謂配線肩滑落斷面形狀。因此在 其上形成之障壁金屬55愈靠近配線溝54膜的厚度愈大。對 於這種形狀用本發明之實施有很多好處。即圖10是說明這 φ 好處的模式剖面圖。圖10(a)是如圖9所示謂配線肩滑落之 銅配線,如圖10(b)所示將銅配線被覆在障壁金屬,形成 表面到底端部幾乎平坦之銅配線。為形成將上層配線接在 下層配線之接觸孔配線必須在下層配線上堆積層間絕緣 膜上形成接觸孔(穿孔)。如圖所示為形成接觸配線將接觸 孔在銅配線上面形成之障壁金屬上形成,而形成接觸孔之 蝕刻區域因對合偏差有一部分進入層間絕緣膜。在此狀態 φ 蝕刻被覆下層配線之障壁金屬之層間絕緣膜,層間絕緣膜 (矽氧化膜)之蝕刻速率比銅膜之蝕刻速率大則層間絕緣 膜部分蝕刻較多,如圖10(a)、圖10(b)虛線所示開口。 , 如圖10(a)深的部分a其深度為b。圖10(b)深的部分a’其深 . 度為bf。因材質決定蝕刻速率b’ = b。在圖10(a)中配線肩滑 落,深的部分之直徑較圖10(b)表面平坦時之直徑為大 (a>af)。換言之在圖10(b)深的部分形成一袋狀空間,這地 -19- 589687
(17) 然後④用CMP法只研磨鋼或研磨銅及障壁金屬形成埋入 層間絕緣膜之銅配線。然後⑤將CMp後之晶圓洗淨,若有 必要⑥銅蝕刻晶圓的斜切部及裏面然後洗淨。最後⑦進行 本發明之銅凹姓處理。
本發明(藥液可在鋼表面形成氧化膜研磨時可保護内 部構造,可當成銅CMP之研漿。又通常在CMp後在同一裝 置或移至其他裝置用滾筒海綿或懸掛海綿等物理方法洗 淨,此時若用鹼性藥液,粒子洗淨效果顯著。本發明之藥 液其pH屬鹼性,對除去CMp後之研磨殘留粒子(鋁或矽等) 很有效。 用濺鍍法或CVD等方法將銅堆積在晶圓的斜切部及裏 面。將用濺鍍法或CVD等方法堆積的銅當成底層用鍍敷法 堆積時晶圓的斜切部及裏面堆積的銅被當成電極,然而鍍 敷後就不要斜切部的銅。晶圓的斜切部及裏面是和其他在 半導體製造時因搬運或核對裝置接觸的部分。這種部分若 被銅冷染,因製造裝置之媒介有可能污染其他晶圓。因此 有必要在銅CMP後將沾在晶圓的斜切部及裏面的銅餘刻 洗淨。也可以在CMP之前洗淨。因為有可能在CMp時再度 被銅污染因此在CMP之後洗淨比較適宜。為了同時洗淨斜 切部及裏面,以迴轉葉片裝置轉動晶圓,從裏面噴出鹽酸 和過氧化氫水之混合液、硝酸、熱濃硫酸、磷酸等氧化力 -21 - 589687
藥液 機構 此 限於 以 圖 數依 凹蝕 rpm (3) · 但以 實際 題。 上部 原因 必須 落等 蚨 水會 葉片 圖形 (21) 一點一點加入鍍敷液内。當然濃度監視或氧化劑除去 、藥液濃縮機構不限於以上所提及之物。 種蝕刻後的溶液當成鍍敷液再利用之程序及裝置不 銅,如Au、Ag、Ti等所有可鍍敷的金屬都可適用。 下參照圖12說明第6實施例。 12是說明銅凹蝕時氨處理晶圓配線電阻和晶圓迴轉 存性之特性圖。在此實施例以迴轉式葉片裝置進行銅 步騾,(1) · NH生OH:H2〇2;DIW (30:100:1000),60秒,1000 ,(2) · NH生OH:H之01DIW (100:100:100),60秒,1000 rpm, HC1 (30:1000),5秒,1000 rpm處理可凹触約50 nm的銅。 鹽酸處理後的銅表面氧化加速。銅表面氧化造成配線 有效的銅減少,配線截面積降低配線電阻上升等問 又銅表面和上部障壁金屬之間形成銅氧化膜,裝置上 的穿孔的接觸電阻上升,可能因產生電容造成延遲的 。在程序上上部障壁金屬形成時控制凹蝕處後的時間 迅速在上部堆積障壁金屬或CMP處理時可能發生剥 問題。 而在鹽酸處理後進行氨-水處理,可以抑制氧化。但氨 蝕刻銅,過度處理造成表面粗糙的原因。使用迴轉式 裝置以氨水蝕刻銅知蝕刻特性依迴轉數改變。以下的 是8吋矽晶圓上0 ·35 μ m之銅配線(配線電阻約342 m Ω )
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(22) 在晶圓面内19薄片形成後將銅用3.5%之氨水蝕刻約10分 鐘後其配線電阻(Ω )以晶圓迴轉數為參數作圖。配線的銅 被蝕刻截面積減少電阻上升。3X 104 πιΩ表示銅完全被蝕 刻。此時晶圓面内蝕刻之均一性不良電阻上升分布不均, 均一性好則分布不均小。超過1000 rpm以上分布不均變 小,1475 rpm附近有極小值,在1600 rpm和接近1000 rpm有相
同的分布不均。 又在2000 rpm下也可進行蚀刻,但400 nm的銅完全被姓 刻。因為只希望在表面處理所以這種高速蝕刻條件不是很 適宜。迴轉數超過1600 rpm以上可預知蝕刻速率會上升, 因此處理條件以1600 rpm以下為宜。是以,為抑制氧化之 氨處理,以1000 rpm以上1600 rpm以下為宜。 在此上述凹蝕程序後實際進行氨處理,在清潔室環境下 處理後保存24小時之銅表面相對於用鹽酸最後加工氧化 φ 呈茶褐色,用氨最後加工則具有處理前同樣的金屬光澤》 處理條件為(1) · NH生OH:H2:〇2;DIW (30:100:1000),60秒,1000 rpm,(2) · NHi〇H:H2_〇2;DrW (100:100:100),60秒,1000 rpm, : (3) · HC1 (30:1000),5 秒,1000 rpm,(4) · NH生OH:DIW (30:1000), 5 秒,1475 rpm 〇 【發明之效果】 本發明用以上方法將以往不容易保持表面平滑之銅蝕 -26- 刻變成可能。用安全且廉價的藥液氧化及短時間内進行钱 刻結果形成被覆在配線構造表面一層安定的障璧金屬。 【圖式之簡單說明】 【圖1(a)〜(d)】說明本發明半導體裝置之製造梦騾半導 體基板之剖面圖。 【圖2(a)〜(b)】說明本發明半導體裝置之製造步騾半導 體基板之剖面圖。 【圖3(a)〜(b)】說明本發明半導體裝置之製造贵騾半導 體基板之剖面圖。 【圖4】形成本發明多層配線半導體基板之剝面圖。 【圖5】形成本發明多層配線半導體基板之别面圖。 【圖6】浸泡在調整pH後的SCM分鐘使其表面形成氧化 膜,用稀鹽酸選擇性蝕刻此氧化膜時表示銅蝕刻量之特性 圖。 【圖7(a)〜(b)】蝕刻前銅表面及以本發明之方法蝕刻後 銅表面之SEM像。 【圖8(a)〜(b)】鹽酸及過氧化氫水混合液和氨水及過氧 化氫水混合液(pH=1〇 2)蝕刻後鋼表面之sem像。 【圖9】說明在本發明之層間絕緣膜上形成配線溝之銅 配線表面形狀之半導體基板之剖面圖。 【圖10(a)〜(b)】說明本發明效果之半導體基板之剖面 -27- 589687
(24) 圖。 - 【圖11】銅配線形成流程圖。 【圖12】以氨處理銅凹蝕時晶圓之配線電阻與迴轉數依 存性之特性圖。 【圖13(a)〜(c)】既有理入配線構造之半導體基板之剖面 圖。 【圖14】以本發明之半導體裝置之製造方法實施半導體 φ 製造裝置之概略圖。 【圖15】說明以本發明之半導體裝置之製造方法實施半 導體製造裝置之循環回收概略圖。 【符號說明】 1、 11、12、21、25、29、41、45、51、101 …層間絕緣膜、 2、 4、6、13、15、22、24、26、28、30、32、42、46、52、
55、102···障壁金屬 3、7、14、23、27、31、43、47、53、103···銅膜、 5…在銅膜表面形成之銅氧化膜、 8…間隔物膜、 9…穿孔配線(接觸配線)、 10、20、40、50、100···半導體基板、 60…室、 61···銅鍍敷槽、 62—CMP室、 63—CMP後洗淨裝置、 64…姓刻槽、 65···處理槽。 -28-
Claims (1)
- 589687 第092102879號專利申請案 中文申請專利範圍替換本(93年1月) 拾、申請專利範圍 1 . 一種半~導體裝置之製造方法,其特徵為具有:在半導 體基板上之絕緣膜中形成之配線溝或接觸孔内堆積配 線金屬以充填前述配線溝或接觸孔之步驟;研磨前述 配線金屬以露出前述絕緣膜之步驟;將前述半導體基 板洗淨之步驟;及將埋入在前述配線溝或接觸孔之前 述配線金屬表面凹蝕之步驟,前述研磨步騾、前述洗 淨步驟、及前述凹蝕步驟中至少兩個步驟所用的藥液 的主要成分相同。 2. —種半導體裝置之製造方法,其特徵為具有:在半導 體基板上堆積金屬或金屬化合物之步驟;及蝕刻除去 前述金屬或金屬化合物不要部分之步騾,前述堆積金 屬或金屬化合物之步驟中包含鏟敷步驟,前述鍍敷步 驟使用之鍍敷液,其與鍍敷對象成分形成鹽或錯合體 的成分和前述蝕刻除去步驟所用的藥液之主要成分相 同。 3. 如申請專利範圍第2項之半導體裝置之製造方法,其中 前述藥液中之主要氧化劑為過氧化氫或臭氧。 4·如申請專利範圍第2項或第3項之半導體裝置之製造方 法,其中前述藥液中主要酸成分為硫酸或氫氰酸。 5·如申請專利範圍第2項或第3項之半導體裝置之製造方 589687 申請專利範圍績頁3 v -- ,t^:<:r ^^;:Μι,ίί^'- 法,其中進一步具有氧化劑除去之步驟,其係將不要 部分蝕III除去步騾後之前述藥液中之氧化劑除去;將 前述藥液中之金屬離子濃度設成和前述鍍敷液中之金 屬離子濃度大致相同之步騾;及將除去前述氧化劑之 藥液當做鍍敷液使用之步驟。 6.如申請專利範圍第2項之半導體裝置之製造方法,其中 前述金屬或金屬化合物為銅,前述鐘敷液係包含硫酸 銅水溶液,而前述藥液係包含硫酸。
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- 2000-11-18 TW TW089124469A patent/TW543123B/zh not_active IP Right Cessation
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2001
- 2001-01-26 KR KR10-2001-0003831A patent/KR100426554B1/ko not_active IP Right Cessation
- 2001-05-29 US US09/865,569 patent/US6475909B2/en not_active Expired - Fee Related
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2002
- 2002-09-04 US US10/233,582 patent/US6818556B2/en not_active Expired - Fee Related
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2003
- 2003-02-12 TW TW092102879A patent/TW589687B/zh not_active IP Right Cessation
- 2003-02-12 TW TW092102880A patent/TWI225277B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
JP3907151B2 (ja) | 2007-04-18 |
US7183203B2 (en) | 2007-02-27 |
TW200300989A (en) | 2003-06-16 |
US6818556B2 (en) | 2004-11-16 |
JP2001210630A (ja) | 2001-08-03 |
KR100426554B1 (ko) | 2004-04-08 |
US20010034125A1 (en) | 2001-10-25 |
US20030001271A1 (en) | 2003-01-02 |
TW543123B (en) | 2003-07-21 |
TW200300988A (en) | 2003-06-16 |
US6475909B2 (en) | 2002-11-05 |
KR20010074557A (ko) | 2001-08-04 |
US20050064700A1 (en) | 2005-03-24 |
TWI225277B (en) | 2004-12-11 |
US6261953B1 (en) | 2001-07-17 |
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