TW527666B - Electroless method of seed layer deposition, repair, and fabrication of Cu interconnects - Google Patents
Electroless method of seed layer deposition, repair, and fabrication of Cu interconnects Download PDFInfo
- Publication number
- TW527666B TW527666B TW090126757A TW90126757A TW527666B TW 527666 B TW527666 B TW 527666B TW 090126757 A TW090126757 A TW 090126757A TW 90126757 A TW90126757 A TW 90126757A TW 527666 B TW527666 B TW 527666B
- Authority
- TW
- Taiwan
- Prior art keywords
- layer
- copper
- electroless
- group
- deposition
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000008021 deposition Effects 0.000 title claims abstract description 27
- 230000008439 repair process Effects 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title description 10
- 239000010949 copper Substances 0.000 claims abstract description 89
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052802 copper Inorganic materials 0.000 claims abstract description 61
- 230000003197 catalytic effect Effects 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 6
- 238000007772 electroless plating Methods 0.000 claims abstract description 5
- 239000008139 complexing agent Substances 0.000 claims abstract description 4
- 239000006174 pH buffer Substances 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 230000004888 barrier function Effects 0.000 claims description 21
- 238000007747 plating Methods 0.000 claims description 20
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 18
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 5
- 238000009713 electroplating Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 229940095064 tartrate Drugs 0.000 claims description 5
- 239000000872 buffer Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 229920004890 Triton X-100 Polymers 0.000 claims description 3
- 239000013504 Triton X-100 Substances 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 229910004200 TaSiN Inorganic materials 0.000 claims description 2
- 229910008807 WSiN Inorganic materials 0.000 claims description 2
- 239000001177 diphosphate Substances 0.000 claims description 2
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 claims description 2
- 235000011180 diphosphates Nutrition 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 229960001484 edetic acid Drugs 0.000 claims 3
- 230000005611 electricity Effects 0.000 claims 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 2
- 239000003054 catalyst Substances 0.000 claims 2
- 238000005498 polishing Methods 0.000 claims 2
- 239000000126 substance Substances 0.000 claims 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims 1
- BEVGWNKCJKXLQC-UHFFFAOYSA-N n-methylmethanamine;hydrate Chemical compound [OH-].C[NH2+]C BEVGWNKCJKXLQC-UHFFFAOYSA-N 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 239000006179 pH buffering agent Substances 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 1
- 210000002784 stomach Anatomy 0.000 claims 1
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 claims 1
- BJAARRARQJZURR-UHFFFAOYSA-N trimethylazanium;hydroxide Chemical compound O.CN(C)C BJAARRARQJZURR-UHFFFAOYSA-N 0.000 claims 1
- 238000000151 deposition Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 19
- 238000001771 vacuum deposition Methods 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 19
- 239000004020 conductor Substances 0.000 description 11
- 230000008901 benefit Effects 0.000 description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- 230000005012 migration Effects 0.000 description 6
- 238000013508 migration Methods 0.000 description 6
- 235000012431 wafers Nutrition 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 5
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- -1 but not limited to Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- NGPGDYLVALNKEG-UHFFFAOYSA-N azanium;azane;2,3,4-trihydroxy-4-oxobutanoate Chemical compound [NH4+].[NH4+].[O-]C(=O)C(O)C(O)C([O-])=O NGPGDYLVALNKEG-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- HHLFWLYXYJOTON-UHFFFAOYSA-N glyoxylic acid Chemical compound OC(=O)C=O HHLFWLYXYJOTON-UHFFFAOYSA-N 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 235000011006 sodium potassium tartrate Nutrition 0.000 description 2
- KTLIZDDPOZZHCD-UHFFFAOYSA-N 3-(2-aminoethylamino)propan-1-ol Chemical compound NCCNCCCO KTLIZDDPOZZHCD-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910008482 TiSiN Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 239000002989 correction material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- CXVAUNIKYTWEFC-UHFFFAOYSA-N dimethoxyborinic acid Chemical compound COB(O)OC CXVAUNIKYTWEFC-UHFFFAOYSA-N 0.000 description 1
- 238000000469 dry deposition Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- QRXWMOHMRWLFEY-UHFFFAOYSA-N isoniazide Chemical compound NNC(=O)C1=CC=NC=C1 QRXWMOHMRWLFEY-UHFFFAOYSA-N 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920002114 octoxynol-9 Polymers 0.000 description 1
- 239000002265 redox agent Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000000080 wetting agent Substances 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
- H01L21/70—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
- H01L21/76871—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers
- H01L21/76874—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers for electroless plating
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/28—Sensitising or activating
- C23C18/30—Activating or accelerating or sensitising with palladium or other noble 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/38—Coating with copper
- C23C18/40—Coating with copper using reducing agents
-
- 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
- H01L21/76879—Filling of holes, grooves or trenches, e.g. vias, with conductive material by selective deposition of conductive material in the vias, e.g. selective C.V.D. on semiconductor material, plating
-
- 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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/288—Deposition of conductive or insulating materials for electrodes conducting electric current from a liquid, e.g. electrolytic deposition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/10—Applying interconnections to be used for carrying current between separate components within a device
- H01L2221/1068—Formation and after-treatment of conductors
- H01L2221/1073—Barrier, adhesion or liner layers
- H01L2221/1084—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers
- H01L2221/1089—Stacks of seed layers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Chemically Coating (AREA)
- Electrodes Of Semiconductors (AREA)
Description
527666 A7 B7 五、發明説明(1 ) 發明範疇 本發明係大體關於金屬電鍍範疇,及更特定言之係於積 體電路製造,在晶圓上無電電鍍銅以填充嵌入結構。 發明背景 在半導體製造的進展以得到積體電路多層導線的發展。 在該積體電路在連接層上有圖案之導體材料係以薄膜材料 像是二氧化矽與另一連接層上有圖案之導體材料電性上絕 緣。此等導體材料係一般爲金屬或金屬合金。連接在不同 導線層導體材料係以在絕緣層形成開口以提供電性導電結 構像是不同導線層有圖案之導體材料能使彼此電性接觸。 此等電性導體結構通常係指接觸或引洞。 另一在半導體製造的進展,像是有能力可重複非常小圖 案之特點可得到整合數以百萬計之電晶體其每一可以高速 開關。一種併入如此多快速開關在積體電路之結果係增加 在操作時之電力消耗。一種在增加速度但降低電力消耗之 技術係將傳統建構在積體電路導線之鋁及鋁合金取代爲金 屬銅其提供,較低電阻。彼等熟諳電子技藝者將欣賞其可降 低電阻,訊號可更快地經由積體電路導線通道傳遞。再 者,因爲銅之電阻係大幅低於鋁之電阻,銅導線之剖面區 域,相較於銘之導線,可製作地較細在基於導線之電阻上 而不會引起增加訊號傳遞延遲。此外,因爲在2電性節點 之間之電容係作用於彼等節點之間重疊面積,使用較細銅 導線可得到減少寄生電容。在此方面以銅爲基礎之導線取 代鋁爲基礎之導線可提供基於所選定之尺寸,降低電阻, -4- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 裝 訂
527666 A7 B7 五、發明説明(2 ) 降低電容或二者。 如上所述,銅之電性優點像是每一剖面區域之低電阻, 提供降低寄生電容之能力,及更加免疫電子遷移。對此所 有之理由,積體電路之製造者發現其有必要加入銅於其產 品中。 雖有電性優點,但銅係不易整合於積體電路之製造。如 此範疇所知,銅對金屬氧化半導體(MOS )場晶體效應 (FETs)之執行有負面的影響其係如果銅遷移或擴散至積 體電路之電晶體區域。因此銅隻阻隔層係要將銅金屬與彼 等電晶體區域絕緣。此外不像鋁爲基礎之金屬導線其可由 次主動蝕刻製程所形成,銅導線一般係由嵌入金屬製程所 形成。有時也指該製程係爲鑲嵌金屬製程。在嵌入製程 中,溝槽係形成在第一層,金屬係形成在包括溝槽第一層 上。隨及研磨多餘之金屬以留下在溝槽中個別之導線。 因此,有金屬電鍍方法,材料及儀器之需求以在晶圓上 形成由銅和銅合金之導體導線。 圖例簡述 圖1銅嵌入結構之剖面概要圖。該結構係代表電鍍後研 磨前之製造狀態其已執行主體電解沉積在無電製程沉積層 上0 圖2銅嵌入結構之剖面概要圖。該結構係代表電鍍後研 磨前之製造狀態其無電C u沉積製程係用來修補晶種層以 及執行主體填充。 圖3相對應本發明之方法流程圖。 -5- 本纸張尺度適用中國國家標準(CNS) A4規格(210X297公釐) 527666 A7 B7 五、發明説明(3 ) 圖4相對應本發明之另一方法流程圖。 圖5相對應本發明之更進一步之另一方法流程圖。 圖例詳敘 敘述無電銅電鍍方法。以下將提出許多特定細節敘述以 提供對本發明之了解。然而對彼等熟諳技藝者及此揭露有 好處係顯而易見,本發明可以儀器及製程其不同於彼等在 此特定者來執行。 於此參考” 1具體實施例π,” 1種具體實施例”或相似之 構想意指相連於具體實施例所述特定之特點、結構、或性 質係至少存在與本發明之具體實施例。因此,其中所出現 之該片語或構想則不必全指向相同之具體實施例。再者, 不同之特定之特點、結構、或性質可以合適之方式相連於 1或多具體實施例。 術語 該詞,晶粒,積體電路,整體的元件,半導體元件或成 分,微電子元件或成分,和相對的詞和敘述係通常可交互 的用在此镇域。本發明係可應用在上述所有正如其在該領 域大體所能了解。 該詞,皆相關於金屬線,痕跡,金屬絲,導體,訊號路 徑,及訊號媒介。上述所列之詞大體可交互使用及以特定 到一般性的順序排列。在該領域,金屬線有時係指痕跡, 金屬絲,線,導線或簡單的金屬。 該詞,接觸和引洞二者皆指在不同内連接層導體之電性 連接結構。此等詞係有實用在此技藝來敘述絕緣體之開口 -6 - 本紙張尺度適用中國國家標準(CNS) Α4規格(210X 297公釐) 裝 訂
52^666 A7
其以芫成結構,及完成結構之本身。爲此揭露之目的,接 觸和引洞係指完成結構。 單位公克/升係所寫成g/1。 該詞垂直,用於此,主要係指垂直於基板之表面。 如上所述,在嵌入製程中,溝槽係形成在第一層,金屬 係形成在包括溝槽第一層上。隨及研磨多餘之金屬以留下 在溝槽中個別之導線。嵌入金屬製程係指單一嵌入如果僅 有形成溝槽及雙嵌入如果形成溝槽及引洞開口。更特定言 之,在一般之雙嵌入製程,阻隔層係形成在介電層,溝槽 及引洞開口之表面。此阻隔層係由1或多種材料所形成, 選用之材料係因其有防止,或主要消減銅從導線擴散至周 圍介電層之能力。隨即形成銅晶種層在阻隔層上,及執行 一般之銅電鍍。 一般形成C U晶種層之方法係包括自我離子電漿沉積 (SIP )’其不能提供在小溝槽及引洞上一致的及連續的薄 層。相比之下,相對應本發明之無電沉積形成C u晶種層 之方法係可用在沉積連續的及一致的薄C u晶種層其基本 上可得到無孔洞電鍍C u導線。再本發明之具體實施例 中’ C 〇層係用作爲一催化表面,也可當作分流層以提供 改善C u導線電子遷移之特性。 一種相對應本發明無電之製程可用來修補s j P沉積C u晶 種層及也可用來製造Cu導線。 圖1銅嵌入結構1 0 0之剖面概要圖其形成在部分製程晶 圓。嵌入結構1 0 0係代表電鍍後研磨前之製造狀態其已執 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)
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527666 A7
,包解'几和在無電製程沉積層上。電子沉積或電鍍係 肩/在極與揚極之間提供驅動電流。驅動該電流一般係 在叫圓加電壓(晶圓在電鍍槽中係爲一電極),因此有 逐原銅藉由從晶圓得到電子。更特定言之,圖案化一 ILD 係彳疋“中溝槽。如圖1所示,該溝槽之垂直側邊與底 二表面積,其ILD i 〇2頂部表面積係由阻隔層1 〇 4所覆 二、形成阻隔層1〇4之材料.係主要或完全防止銅原子從接 ’’、貝所形成 < 銅或銅合金層擴散。在阻隔層1 0 4上形成一晶 種層1 0=。銅及鈷係爲金屬之實例可用在形成晶種層 1〇5。隨即執行無電銅沉積。無電Cu層1〇6係在晶種層 1 0 5上形成。該操作係對晶種層i 〇 5形態有利的。沉積 =層係指修補晶種|。如圖i更進一步所指,執行銅主 體填无已完成溝槽填充操作。主體填充銅B 銅層⑽二者其在溝槽及ILD1G2頂部表面積。^實: 中,形成王體填充銅係由電子沉積。 圖2+銅嵌入結構2 〇 〇之剖面概要圖其形成在部分製程晶
圓。簽人结構2 00係代表電艘後研磨前之製造狀能W 〜沉積製程係用來修補晶種層以及執行主體填二;: 定言之,圖案化一 ILD 102 #從其巾i # ,、 你仗具宁溝槽。如圖2所示,該 溝槽之垂直側邊與底部表面積,其ILDl〇2頂部表面積係 由阻隔層104所覆蓋。形成阻隔層1〇4之材料係主要或完 全防止銅原子從接續所形成之銅或銅合金層擴散。在阻严 層1〇4上形成一晶種層105。銅及始係爲金屬之實例可: 在形成晶種層105。隨即執行無電鋼&積。如圖2更進一
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527666 A7 B7 五、發明説明(6 ) 步所指,執行銅主體填充已完成溝槽填充操作。主體填充 銅2 1 0係覆蓋無電銅層1 05二者其在溝槽及ILD 102頂部表 面積。在此實例中,形成主體填充銅係由電子沉積。事實 上,主體填充操作係可爲連續性無電沉積其用在修補晶種 層。 説明方法 本發明之具體實施例包括無電沉積薄C u晶種層在阻隔 層上以促進C u導線電鍍。該晶種層之厚度一般係爲約 100埃。該形成阻隔層之材料包括但不受限於Ta, TaN,TaSiN,W,WN,WSiN,Ti,TiN,TiSiN,及 其此等材料之組合物。 無電金屬電鍍係爲從溶液自動催化(無-電子)沉積之方 法。還原金屬離子所需之電子係由在催化表面還原劑之自 發氧化反應所提供以還原金屬離子。電鍍起始於催化之表 面及由電鍍金屬表面本身之催化本質所維持。相對應本發 明無電製程之不同部分係包括催化無電C u沉積及無電槽 成分。 關於催化無電C u沉積,此反應發生在一層其有催化之 特性已引發起始還原劑之氧化反應。C u,P d,P t,Ru, R h,A u,A g,C ο,及N i係爲氧化還原劑之催化反應。 於此説明之具體實施例所敘,C 〇係爲催化層。C 〇可藉由 濕式或乾式法沉積在阻隔層上。乾式沉積方法實例包括 C VD,P VD及ALD (原子層沉積)。濕式沉積方法實例包 括Co接觸取代沉積其在溶液包含有Co離子及酸(像是, -9- 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 527666 A7 B7 五、發明説明(7 ) 但不受限於,HF,HC1,及HN〇3)或鹼(像是,但不受限 於,KOH,及四甲基氫氧化氨TMAH)以溶解阻隔層之氧 化物,複合劑(像是,但不受限於,擰檬酸,醋酸)及還原 劑(像是,但不受限於,連二磷酸鹽,二甲基硼酸(DMAB ) ,聯氨)。C 〇係相當好用也可改善銅導線之電子遷移特 性。此類C 〇層厚度一般係小於5 0 0埃。於此説明之具體 實施例所敘,C 〇層厚度主要係爲1 0 0埃。 關於無電槽成分,使用銅來源、還原劑、p Η缓衝劑、 複合劑、及介面活性劑。可使用一種像是簡單銅之鹽類 (1 -10 g/1 )像是硫酸銅,氯化銅,硝酸銅爲銅來源。甲 醛、連二磷酸鹽及乙二酸可用爲相對應本發明無電沉積銅 之還原劑(2-15 g/Ι)。事實上所有商業化無電銅槽係用甲 醛爲還原劑。然而,由於環境健康安全之理由,使用含有 甲醛之無電銅槽在未來於半導體製造上是不預期可允許 的。因此,乙二酸係目前較加之還原劑成份其用在相連於 本發明之具體實施例。 使用上述所敘還原劑之無電銅槽需有相當高之pH通常 在9及13,及大體可用氫氧化鉀(KOH),或氫氧化鈉 (NaOH)來調整。然而在先進導線應用上,係較佳使用無 鹼金屬pH調整者像是氫氧化氨或四甲基氫氧化氨 (TMAH) 〇 因爲銅鹽類係不溶於鹼性的p Η,必須使用一種複合劑 或螯合劑。乙二胺四乙酸(EDTA)、酒石酸鹽(Rochelle 鹽,酒石酸銨)及醇胺像是四元醇(N,N,NWtetrakis(2- -10- 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 527666 A7 _B7 五、發明説明(8 ) hydroxypropyl(ethylenediamine)或相關之化合物通常係用 10-75 g/Ι之範圍。酒石酸鹽之優點係特別適用在低沉積速 率,近室溫之應用,及易廢水處理。 一種介面活性劑像是聚乙二醇(5-100 ppm)可用爲潤濕 劑。除了聚乙二醇,介面活性劑像是但不受限,可用聚丙 二醇,Triton X-100 (t_octylphenoxypolyethoxyethanol)其由 Sigma-Aldrich of St· Louis,Missouri 提供及 Rhodafac RE 610 其由 Rhone-Poulenc,France 提供。 一種相對應本發明之在高溫槽之特定實例(於此稱槽 A),包括 3 g/1 CuS04 · 5H20,6 g/Ι 乙二酸,20 g/Ι 酒石酸 銨,需KOH或TMAH量來調整槽A之pH爲12.3,及10 ppm之聚乙二醇(PEG)。此例中該槽係在70°C操作,然而 一高溫槽如此所述可在溫度介於4CTC及90°C之間操作。 一種相對應本發明之在室溫槽之特定實例(於此稱槽B ) ,包括 3 g/1 CuS04 · 5H20,6 gA 乙二酸,20 g/1 Rochelle 鹽,需TMAH量來調整槽B之pH爲12·3,及100 ppm之聚 乙二醇(PEG)。在室溫下所揮發TMAH量係大幅度地小於 在高溫之槽A,因此槽B較槽A可穩定在較長之一段時 在此範圍平凡之技術將了解其結合在一起之成份以形成 電鍍槽可在結合時形成多樣之混合物或反應產物可離子化 或解離或形成複合物。 對一給定之槽,晶粒大小及表面粗操度係隨沉積時間增 加(其亦可換句話爲厚度之觀點);然而對厚度在1 〇〇埃之 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 527666 A7 B7 五、發明説明(9 ) 等級,可得到平滑之表面。一致性無電銅沉積以由細溝槽 發明者證實(例如,在介電層〇· 1微米)。 一種無電銅槽可應用不同方式製造C u導線包括例如, 形成晶種層/分流層,晶種層修補,及導線之主體C u沉 積。第一之應用,一種Cu晶種層可沉積在薄催化Co層其 本身可以無電或眞空法沉積。一種一致的與連續的c u晶 種層可得到接續之無洞電鍍C u導線。在下層之C 〇層係爲 電子之分流層以完成導線,因此改善C u導線電子遷移之 特性。第二之應用係藉由無電沉積薄層C u以修補晶種層 之缺陷。該缺陷發生在晶種層以由眞空製程沉積。在此 例,額外一催化層係沒有必要的(例如,C 〇催化層)。第 三之應用係形成主體Cu導線其藉由填充溝槽及經由延長 無電C u沉積。相較於電子製程其在晶圓無一致性之電流 分部導致無一致性C u沉積,一種無電製程提供較佳一致 性之沉積。如上所述之C 〇層可用在C u導線以改善電子遷 移特性。 結論 本發明之具體實施例提供無電C u沉積晶種層可用於一 嵌入製程形成在積體電路上之導線。此等導線一般係爲銅 或銅合金。 一個在一些本發明之具體實施例之優點係無電C u電鍍 槽使用對環境上合適之成分。特定言之,甲醛不需要在相 對應本發明之無電C u電鍍槽。 本發明某些實施例之進一步優點係爲Co/Cu晶種層提供 -12- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 527666 A7 B7 五、發明説明(1〇 ) 銅互連之電子遷移特性的改進。 一個更進一步在一些本發明之具體實施例之優點係沉積 材料得到較佳一致性之厚度。 對彼等熟諳此技藝者將顯而易見在上述説明之具體實施 例可得導一些變化與修正。例如,不同組合之銅來源, pH緩衝劑,pH目標値,複合劑,及其他上述無電電鍍槽 之成分,以及在本發明範圍所用電鍍槽之溫度。 其他從特定所述儀器之修正材料及製程將對彼等熟諳此 技藝者及在本揭露有好處者顯而易見。因此,所有此類之 修正與選擇將欲認爲在最後增添申請專利之精神與範圍。 -13- 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐)
Claims (1)
- 六、申請專利範圍 1· 一種形成銅導線的方法,其包括有 形成一溝槽,於基板上所沉積之介電層上,該溝槽和 介電層有暴露的表面; 形成一阻隔層,在該暴露的表面上; 形成一催化層,在該阻隔層上;及 項之方法’更進一步含有執行銅主體填 執行一 種層之無電沉積在該催化層上 2.如申請 充操作。丨 3·如申請專"^^2項之方法,其中阻隔層包含之材料係遠 自於有 Ta,TaN,TaSiN,W,WN,WSiN,Ti , 4.:2倉=’其中一之材― TlN,TiSiM:群,及其此等材料之組合物 群 Rh,Au,Ag,Co 及 Ni 之 5.如申請專翁β之方法,其中形成催化層包含沉積 C 〇 〇 6_如:請專詹項之方法,其中執行無電Cu電鍍操作含 有π至孩_||在無電電鍍槽其含有銅來源、還原劑、 pH缓衝劑合劑、及介面活性劑。 =申Μ專’第6項〈方法’其中包含維持無電電艘槽之 /皿度在40 C及90 C之間’該還原劑係選自於含有甲醛、 ,了磷酸鹽及乙二酸之群,該ρ Η缓衝劑係選自於含有 氫氧化氨及二甲基氫氧化氨之群;該複合劑係選自於含 有乙二胺四乙酸、酒石酸鹽及四元醇之群;該介面活性 本紙張尺歧种國(CNS) A4規格 -14 - A B c D 527666 ^、申請專利範圍 劑係選自有聚乙二醇、聚丙二醇、Triton X-100及 Rhodafac 之群。 8. 如申請專知第6項之方法,更進一步包含維持無電電鍍 槽之溫度g 2O°C及30°(:之間,該還原劑係選自於含有曱 醛、連二磷酸鹽及乙二酸之群,該p Η緩衝劑係選自於 含有氫氧化氨及三甲基氫氧化氨之群;該複合劑係選自 於含有乙二胺四乙酸、酒石酸鹽及四元醇之群;該介面 活性劑係選自於含有聚乙二醇、聚丙二醇、Triton X-100 及 Rho|^_ RE 610 之群。 9. 如申請專項之方法,更進一步包含以化學機械研 磨移除多銅主體部分以形成個別之導線。 10. 如申請專項之方法,更進一步包含以化學機械研 磨移除多餘之銅主體部分以形成個別之導線。 11. 一種修補銅晶種層之方法,其包含有 形成一層在基板上,該層係作用爲阻隔層以阻隔銅原 子擴散通過; 藉由自.我離子電漿於該阻隔層上沉積一銅晶種層;及 將該基板浸入一無電銅電鍍槽; 其中該無電電鍍槽係以至少CuS04 · 5H20、乙二酸; p Η緩衝劑合劑,和聚乙二醇所形成。 12. 如申請專1項之方法,其中pH緩衝劑係選自於含 ! U' ^ 有氫氧化嫌_四甲基氫氧化氨之群。 13. 如申請專较Ρ 1 2項之方法,其中複合劑係選自於含有 乙二胺四乙酸。 -15- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) A8 B8 C8 D8-1¾ 527666 14.如申請專|}:|11項之方法,其中pH缓衝劑係選自於本 有三甲基化氨及複合劑係含有酒石酸鹽。 U如申請專考胃丨3項之方法,更進一步包:維持 鍍槽之溫約70°C。 % 16·如申請專靖1 4項之方法,更進一步包本 ^。隹待《電電 鍍槽之溫靡1:溫。 二了:’’ Ί I·7· —種形成病導線之方法,其包含有 形成一溝槽’於基板上所沉積之介電層上,該溝样 介電層有暴露的表面; 形成一阻隔層,在該暴露的表面上; 形成一催化層,在該阻隔層上; 執行一銅晶種層之無電沉積在該催化層上;及 及執行与充操作以至少填充該溝槽。 18·如申請專Ρί17項之方法,其執行主體填充操作係包 含浸至該在電鍍槽及加驅動電流。 19. 如申請專^^1 7項之方法,其執行主體填充操作係包 含無電CU=_ ° 20. 如申请專_丨准丨9項之方法,其中無電c u沉積係在第i電 鍍槽中執第1電鏡槽也用在修補晶種層。 21·如申請專9項之方法,其中無電c u沉積係在第2電 鍍槽中執及晶種層係在第1電鍍槽中執行其不同於 第2電鍍 22.如申請專霄!^21項之方法,其中催化層包含c〇及第 艘槽係包棱差少四甲基氫氧化銨,乙二酸及聚乙二醇。 -16 -本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐)
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2001
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- 2001-11-06 AU AU2002217822A patent/AU2002217822A1/en not_active Abandoned
- 2001-11-06 WO PCT/US2001/043861 patent/WO2002045155A2/en not_active Application Discontinuation
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CN105274591A (zh) * | 2014-07-15 | 2016-01-27 | 罗门哈斯电子材料有限责任公司 | 无电极铜电镀组合物 |
TWI579407B (zh) * | 2014-07-15 | 2017-04-21 | 羅門哈斯電子材料有限公司 | 無電銅鍍覆組成物 |
CN105274591B (zh) * | 2014-07-15 | 2017-10-24 | 罗门哈斯电子材料有限责任公司 | 无电极铜电镀组合物 |
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US20020064592A1 (en) | 2002-05-30 |
WO2002045155A2 (en) | 2002-06-06 |
WO2002045155A3 (en) | 2003-06-05 |
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