TW557560B - Method of preparing copper metallization die for wirebonding - Google Patents
Method of preparing copper metallization die for wirebonding Download PDFInfo
- Publication number
- TW557560B TW557560B TW091104380A TW91104380A TW557560B TW 557560 B TW557560 B TW 557560B TW 091104380 A TW091104380 A TW 091104380A TW 91104380 A TW91104380 A TW 91104380A TW 557560 B TW557560 B TW 557560B
- Authority
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- Taiwan
- Prior art keywords
- wafer
- copper
- patent application
- cleaning
- gasket
- Prior art date
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 72
- 239000010949 copper Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000001465 metallisation Methods 0.000 title description 2
- 238000004140 cleaning Methods 0.000 claims abstract description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002253 acid Substances 0.000 claims abstract description 24
- 239000004065 semiconductor Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 239000012190 activator Substances 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 12
- 239000001257 hydrogen Substances 0.000 claims abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000009461 vacuum packaging Methods 0.000 claims abstract description 10
- 238000004544 sputter deposition Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 14
- 238000002161 passivation Methods 0.000 claims description 9
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 3
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 claims 1
- 241001247287 Pentalinon luteum Species 0.000 claims 1
- 241000981595 Zoysia japonica Species 0.000 claims 1
- 239000007800 oxidant agent Substances 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 238000000746 purification Methods 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 abstract description 11
- 238000006386 neutralization reaction Methods 0.000 abstract description 5
- 239000012670 alkaline solution Substances 0.000 abstract description 4
- 239000000243 solution Substances 0.000 abstract description 4
- 235000006708 antioxidants Nutrition 0.000 abstract 2
- 235000012431 wafers Nutrition 0.000 description 107
- 238000003466 welding Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 6
- 238000005476 soldering Methods 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 238000012858 packaging process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 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
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- ISQINHMJILFLAQ-UHFFFAOYSA-N argon hydrofluoride Chemical compound F.[Ar] ISQINHMJILFLAQ-UHFFFAOYSA-N 0.000 description 1
- -1 argon peroxide Chemical class 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/02—Bonding areas ; Manufacturing methods related thereto
- H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L24/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
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- 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
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
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- 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
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- H01L21/311—Etching the insulating layers by chemical or physical means
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- H01L21/31111—Etching inorganic layers by chemical means
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- H01L21/31122—Etching inorganic layers by chemical means by dry-etching of layers not containing Si, e.g. PZT, Al2O3
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- 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
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- 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
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- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
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- H01L24/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
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- H01L2224/038—Post-treatment of the bonding area
- H01L2224/0381—Cleaning, e.g. oxide removal step, desmearing
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- H01L2224/04042—Bonding areas specifically adapted for wire connectors, e.g. wirebond pads
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- H01L2224/0554—External layer
- H01L2224/05599—Material
- H01L2224/056—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/05638—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/05647—Copper [Cu] as principal constituent
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- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
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- H01L2224/32245—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
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- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
- H01L2224/45117—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 400°C and less than 950°C
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Description
557560 A7 B7 五、發明説明( 發明背景 1·發明領域 本發明關於積體電路,更特別地,關於一種用以製備一 具有含鋼墊片之晶片以供更穩定的打線之半導體晶圓之方 法。 2·相關技術背景 積體電路(IC)晶片係一切割自一例如一碎晶圓之半 導體晶圓之小裝置,其上多晶片被形成。這類晶片典型地 經由使用一焊錫或環氧樹脂黏接它們至引線框以封裝保護 它們免於腐蚀。一晶片係電性連接至該引線框之引線,並 接著該晶片及該引線框被密封於一塑膠封裝中β該引線框 之引線自該封裝中伸出並終止於允許該晶片電性連接例如 一印刷電路板上之其它電路之接腳中。 參考圖4 ’ 一用以包裝一晶片之傳統方法被顯示。第一 ’在步驟40 ’ 一晶片係切自或鋸自它形成於其上之晶圓中 。在該晶片切割自該晶圓中後,在一晶片焊接或晶片黏附 步驟42中該晶片後面牢牢地被黏接至一載體或引線框。典 型地’在該晶片焊接步驟42中,該晶片係使用一例如一環 氧樹脂之有機黏劑黏接至該引線框並接著經烘烤處理。一 但該環氧樹脂被處理,在步驟44中該晶片係接線至該引線 框。 圖5係一封裝積體電路50之放大剖面圖。該封裝電路5〇 包含一焊接至一晶片黏接墊片52之晶片51。該晶片51係利 用接線54連接至一引線框53。又,該晶片51、晶片黏接塾 -5- 本紙蒗瓦度適用中國國家標準(CNS) Α4規格(210 X 297公釐) 557560 A7 __B7 五、發明説明(2 )- 片52、接線54及部分該引線框53係密封或塑模於一封裝55 中。該封裝55可以是塑膠、金屬、陶瓷或另一已知封裝材 料。 該接線54連接該晶片51之焊接墊片至該引線框53之焊 接塾片。最常用的晶片連接技術係打線。打線係一固態焊 接處理,其中二金屬材料、一非常薄接線及一墊片表面係 產生接觸。一旦該表面係產生接觸,一熱、壓力及/或紫外 線能f之結合被用來產生電子分享或原子内擴散,導致一 接線之形成。 打線典型地係使用三種工業標準技術其中之一來製造 :使用一壓力與上升溫度結合之熱壓縮(T/C)焊接;使用一 壓力、上升溫度及超音波振動突波結合之熱聲波(T/s)烊接 :及使用一壓力及超音波振動突波結合之超音波(u/s)焊接 這些打線技術係熟知的。雖然也使用例如銀、铭/碎、銘 /鎂、鈀及銅,該較佳之接線材料係為金。 再參考至圖4,在該打線步驟44後,該晶片背面被清潔 ,典型地使用紫外線-臭氧(UV0)清潔法。在uvo清潔法中, 一發射大量鵪射之UV-臭氧清潔劑被用來自該晶片中移除 有機污染物。最後,步驟48,該晶片及引線框組件被塑模 ,形成圖5所示之封裝電路5〇。 在最近幾年,相對於鋁而言,因期待更高時脈速率與改 善之熱官理及執行精密間隔及超精密間隔銅打線能力故重 燃於1C中使用銅線之興趣。為了防止過渡金屬現象,最好 焊接銅線至銅墊片。 -6 - 本紙張尺度適用中國國家揉準(CMS) A4規格_i210x297公釐)
裝 訂
線 557560 A7 B7 五、發明説明(3 不幸地,銅具快速氧化及腐蝕之傾向。腐蝕可能完全打 開該接線兩端,而允許該接線移動至該封裝内,藉此引起 電性短路。該腐蝕發生於出現溼氣及污染物中β例如在 打線£域出線氯或溪可能引起氯化物或漠化物的形成而 引發焊接腐蚀。焊接腐蝕也增加該接線内連線之電阻。因 此,形成一穩定銅對銅焊接可能是困難的。據此,具有一 接線可更穩定焊接至其上之塾片表面係有好處的。 發明概述 為了提供更穩定接線,本發明提供一用以製備一具有許 多積體電路形成於其上之半導體晶圓之方法,該積體電路 具有由銅組成之墊片。在本方法中,該氧化物係自該銅墊 片中移除且接著該晶圓係真空包裝於一防震容器中β該氧 化物可以數種方法自該銅墊片中移除。一第一種方法包含 於一鹼性液中清潔該晶圓,對該已清潔晶圓執行酸中和, 及接著弄乾該晶圓。一第二方法包含以一酸溶液清潔該晶 圓,例如將該晶圓浸入一盆Ηβ〇4或ΗΝ〇3中,以水清洗該酸 清潔晶圆’施用一抗氧化劑活化劑至該銅蟄片表面,在應 用該抗氧化劑活化劑後以水清洗該晶圓,及接著弄乾該已 水洗晶圓。又一第三方法包含在一約為5_2〇毫托耳之超低 真空壓力中使用一約5-10%氫及約90-95%氬混合劑以電漿 清潔該銅墊片及接著濺鍍一例如鋁之非常薄氧化物鈍化層 至該銅整片之表面上。該氧化物鈍化層具有一約1至約i 〇 毫微米之厚度。 本發明又提供一以一銅線電性連接一積體電路之一銅 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)
裝 訂
k 557560 A7 ___ B7 五、發明説明(4 ) 墊片與一引線框之一墊片之方法,包含下列步驟為使用約 5-10%氫及約90-95%氬電漿清潔該銅及接著將接線打線至 該已清潔鋼墊片及該引線框墊片。 圖式之簡單說明 本發明較佳具體實施例之前述概述及下列詳細說明在 配合所附圖式讀取時將會有較好的了解,顯示於該圖式具 體實施例係表現較佳的。然而,應注意,本發明不限於所 示之精心安排及手段。在該圖式中·· 圖1係一根據本發明之一第一具體實施例說明涉及製備 一具有一或更多積體電路形成於其上之半導體晶圓之步驟 之方塊圖; 圖2係一根據本發明之一第二具體實施例說明涉及製備 一具有一或更多積體電路形成於其上之半導體晶圓之步驟 之方塊圖; 圖3係一根據本發明之一第三具體實施例說明涉及製備 一具有一或更多積體電路形成於其上之半導體晶圓之步驟 之方塊圖; 圖4係一說b月涉及製備一積體電路裝置之傳統步驟之方 塊圖, 圖5係一封裝積體電路晶片之放大剖面圖;及 圖6係一根據本發明之一第四具體實施例說明 J,步及製備 一積體電路裝置之步驟之方塊圖。 發明之詳細說明 結合所附圖式說明於下之詳細說明係想要當成— 田 < —本發 -8 - 本紙張又度通用中a國家標準(CNS) A4規格(210 X 297公釐) 557560 A7 ___ B7 五、發明説明(5 ) 明所示之較佳具體實施例說明,而不要代表本發明實行之 唯一形式。該說明結合圖示具體實施例以執行程序步驟之 順序描述。然而,應了解,相同或等效功能及順序可由要 包括於本發明之精神及範圍内之不同具體實施例來達成。 在該圖式中,類似編號係用以指示全部類似元件。 如前述,因電性效率及成本優點故使用銅内連線金屬化 技術來製造積體電路變得普遍。為了防止過渡金屬現象, 提供給IC銅墊片❶典型地,雖然銅及銀也可使用,但打線 具有晶片載體或引線框之1C係使用金及鋁線材料來執行。 烊接這些線至不同墊片材料產生不同冶金系統。如此,基 於提供1C銅墊片之相同理由,最妤使用銅線來連接該1(:之 銅墊片至該引線框。 不幸地’銅氧化非常快,使它更難以達到一穩定接線。 因此’為了確保該接線之焊接度及穩定度,該關鍵條件其 中之係該烊接表面須沒有任何污染物。典型地,電路係 在某一地方形成於晶圓上且接著該晶圓被傳送至自該晶圓 中切割及封裝該電路所在之另一地方。因相當多時間花在 該晶圓製造及;·該封裝處理之間,該銅墊片氧化可能發生於 這類時期。據此,本發明在製造該電路於一晶圓後並在該 晶圓被包裝載至該封裝場所前提供來清潔一積體電路之鋼 塾片。 現在參考至圖1,顯示一製備一具有許多積體電路形成 於其上之半導體晶圓之弟一方法,該積體電路具有由銅組 成足墊片。在一矽晶圓上形成具有銅墊片之電路之方法係 -9- 本紙尺度通用中a a家標準(CNS) :\4規格(21() x 297公董) 557560 A7 B7 五、發明説明(6 ) 已知且一其詳細說明用於了解本發明是不需要的。應了解 ’本發明方法係在一積體電路已形成於該晶圓上後才執行 。大致上,此係在所有層已施加至該晶圓且該晶圓已於解 離子水中清洗而該晶圓背面已被磨平以移除不要的材料後 ’又,最妤,在各晶片或裸晶之測試已執行後。典型地, 在執行測試後,該晶圓再使用例如解離子水、異丙基乙醇 、丙酮及甲醇之溶劑來清潔。本發明係指向在該晶圓已經 測試後所執行之清潔並提供用以自該銅塾片中移除氧化物 及接著真空包裝該晶圓。 更特別地’始於步驟10 ’該晶圓及特別是各晶片之銅勢 片係以驗液來清潔。最好,該晶圓係在室溫下利用一鹼性 溶液將該晶圓浸入或埋入一鹼性浴盆中約1至約20秒間。用 以移除氧化物之鹼性溶液通常被用來製造引線框且係為那 些熟知此項技術之人士所熟知。 自該鹼性浴盆移除該晶圓後,一酸中和步驟12被執行。Λ 該酸中和步驟12最好係執行於室溫下在一酸性浴盆中浸入 或埋入該晶圓約1至約20秒以確保所有氧化物已自該銅墊 片中被移除。所使用之酸最好係為h2so4或ηνο3,然而,其 它酸也可使用,例如磷酸、過氧化氩、氫.氟酸及鹽酸,這 些係商用且常用於半導體製造處理中。然而,將了解,據 那些熟知此項技術之人士所了解之例如檸檬酸之其它酸也 可被使用。 在該酸中和步驟12後,該晶圓在步驟14被弄乾。該晶圓 可使用環繞或暖空氣及/或一商用吹風機任一者來弄乾❹另 -10- 本紙張尺度適用中國國家標準(CNS) Α4規格(210 X 297公釐)
装 訂
k- 557560
外’該日日圓可使用壓縮空氣或_例如氮氣之氣禮來弄乾。 該乾燥時間可從數秒變化至數分鐘。然而,最好,該晶圓 不要曝露於%繞2氣中持太長時間,因那個將會使該銅 片氧化。 一旦該晶圓不夠乾燥來進行封裝,該晶圓係在步驟16真 $包裝i真空包裝可使用_般已知之商用真空包裝設備 來執行。最好,該晶圓係包裝於一由一不起作用材料構成 之防震容器中。 當該晶圓係備好用於封裝時,該晶圓從該容器中拆裝且 可開始該封裝處理。在該封裝處理中,不是球形焊接就是 楔形焊接被執行。進一步,如那些熟知此項技術之人士所 了解的,若聚合材料被用於晶片黏接,該聚合物應於一鈍 氣中作處理以防止氧化。 現在參考至囷2,顯示一用以製備一具有許多積體電路 形成於其上之半導體晶圓之第二方法,該積禮電路具有由· 銅組成之墊片。類似該第一具體實施例,該第二具體實施 例最好在該晶圓上之晶片已測試後執行。 更特別地,在測試後,該晶圓係在步驟2〇以一酸溶液清 潔並接著在步驟22以水清洗。在步驟20中清潔該晶圓最好 係在室溫或上升溫度將該晶圓浸入或埋入一酸性浴盆中。 該晶圓最好係浸入該酸性浴盆約2至20秒,且,約10秒更好 。最好,該酸溶液不是h2s〇4就是ηνο3,然而,例如磷酸、 過氧化氫、氩氟酸及鹽酸之其它酸也可使用,這些係商用 且常用於半導體製造處理中《該水洗步驟22最好係使用解 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)
裝 訂
k 557560 A7 _ ___B7 五、發明説明(8 ) 離子水在約21°C執行約2分鐘。 在該晶圓於步驟22清洗後,一抗氧化劑活化劑在步騾24 施用至該銅表面。可使用任何用於該半導體及引線框製造 之商用抗氧化劑。取好玄晶圓被浸入或埋入一盆抗氧化 劑活化劑中。然而,該活化劑可以例如噴霧之其它已知方 式來施用。 從該抗氧化劑浴盆移除該晶圓後,該晶圓係以水清洗並 弄乾。最好,該晶圓係使用解離子水清洗並接著弄乾。該 晶圓可利用環繞或暖空氣任一者來弄乾。又,該晶圓可使 用一商用吹風機來弄乾。 最後,步驟16被執行,其中該已弄乾晶圓係真空包裝於 一最好是防震且由不起作用材料構成之容器中。 現在參考至圖3中,顯示一用以製備一具有許多積體電 路形成於其上之半導體晶圓之第三方法,該積體電路具有 由銅組成之塾片。類似該第一及第二具體實施例,該第三 具體實施例最好在該晶圓上之晶片已測試後執行。 更特別地,在測試後,該氧化物係在步驟3〇自該晶圓中 移除。該氧化物可利用執行圖1所示之鹼性浴(步驟1 〇)、酸 中和(步驟12)及弄乾(步驟14)或執行圖2所示之酸性浴(步 驟20)、水洗(步驟22)、抗氧化劑活化劑施用(步驟24)及水 洗並弄乾(步驟26)。然而,該氧化物移除步驟3〇可包括分 子或電漿清潔。 電漿清潔使用一高功率射頻(RF)源、微波或直流電以轉 換氣體成為電漿。該高速氣體離子轟擊該焊接表面(也就是 -12- « ' — - .............. " .....__— ' 丨 一 本紙張又度適用中國國家搮準(CNS) A4規格(21〇x 297公*)
装 訂
557560 A7 _____B7 _ 五、發明説明(9 ) ,該銅塾片)及以物性或化性裂開該污染物分子來清除該焊 接表面之污染物。電漿清潔半導體及引線框係那些熟知此 項技術之人士所了解且用以執行這類電漿清潔之機器係商 用的。然而,本電漿清潔技術不足以自銅中移除氧化物。 在傳統電漿清潔中,該離子化氣體係氧、氬、氮,8〇% Ar + 20% 〇2或80% 〇2 + 20% Ar。另外,〇2/n2電漿也被使用。該 發明人已決定這些氣體及氣體之結合不夠清潔該銅塾片。 如此’根據本發明,該電漿清潔步驟係使用一約5-1〇%氫及 約90-95%氬之結合來執行。從經驗中得知,使用氫氣須在 一超低真空壓力下執行以提供該清潔離子一較長平均自由 路徑來到達被清潔表面是已決定的。也就是,該電漿清潔 最好係在一介於約5至20毫托耳間之超低壓力下利用約 800-1000毫瓦之微波功率來執行。 一旦該氧化物已自該晶圓中移除,步驟32,一例如鋁或 其它有機/無機塗佈之薄層氧化物純性材料被施用,最好賤, 鍍於該銅整片上。又稱為部分真空蒸鍍之濺鍍/PECvj)(電漿 促進化學氣相沉積)係一發生於一包含一例如一本例中最 好為銘之硬厚片之薄膜材料之目標物之真空室及該晶圓之 物性處理。氬氣被引進該室内並離子化為一正電荷。該帶 正電荷氬原子加速擊向該鋁,擊出該鋁原子。該擊出之銘 原子係沉積至包含該銅墊片表面之晶圓表面上。濺鍍在該 銅塾片上形成一均勻厚度之鋁。根據本發明,該濺鍍係只 被執行約2-3秒》 如習知中已知的以鋁覆蓋銅墊片以防止氧化,這類傳統 -13- 本紙張尺度適用中國國家樣準(CNS) Α4規格(210 X 297公釐) 557560 A7 _____B7__ 五、發明説明(10 ) 銘外套典型地係在10-20仟埃厚左右。反之,本發明使用濺 鍍/PECVD來提供一鋁皮或最好具有一約1-5毫微米厚度之 其它無機/有機氧化鈍性/PECVD材料。 最後,如前二具體實施例所述,步驟16被執行。也就是 ’該已弄乾晶圓係真空包裝於一最好由不起作用材料構成 之防震容器中。 前述圖1 -3所示方法係指向清潔一形成於一矽晶圓上之 積體電路之銅墊片及真空包裝該晶圓致使該銅墊片在打線 前不會氧化。據此,更穩定接線係使用執行上述方法之晶 圓來形成。 現在參考至圖6,一類似上述圖4所示之傳統方法以組合 半導體之方法被顯示。然而,如前述,銅墊片非常容易氧 化’因此為了提供更穩定接線,在組合期間應更小心。又 ’該發明人決定在該晶片自該晶圓(步驟40)被切割及焊接 至該晶片黏附墊片(步驟42)後並在打線(步驟44)前執行電> 漿清潔(步驟60)將會擁有更穩定的接線。 如參考囷3之上述,該電漿清潔步驟係使用一約5-1〇%氫 及約90-95%氬結合來執行。進一步,該電漿清潔最好係在 一介於約5至20毫托耳間之超低真空壓力以一約8〇〇_1〇〇〇 毫瓦之微波功率來執行。 在該晶片被清潔後,該接線步驟44被執行,接著步驟46 為該傳統步驟之UVO清潔及步驟48密封或塑模。 如同顯而易見的,本發明提供用以製備具有含銅墊片之 晶片之晶圓之方法致使當在該晶圓上之晶片備好封裝時, -14- 本紙張尺度適用中國國家標準(CNS) Α4規格(210 X 297公釐) 557560 A7 B7 五、 發明説明(11 ) 該銅墊片具有較少氧化並因此該墊片之打線產生更穩定的 焊接。本發明又提供一用以在該晶片封裝處理期間製備一 具有含銅墊片之晶片之晶圓以減少該銅墊片上之氧化致使 該墊片之打線產生更穩定焊接之方法。如所了解的,本發 明係指向製備打線用之銅墊片。本發明不限於使用銅線來 打線,例如金或鋁之其它接線也可使用。進一步,雖然本 發明已使用球焊接來執行,它係不限於球狀焊接,也可以 楔狀焊接來實施。 本發明之較佳具體實施例說明已基於顯示及說明目的 來呈現,而不是要耗盡或限制本發明為所揭示之形式。那 些熟知此項技術之人士所了解其改變可產生於上述具體實 施例而不偏離其廣義發明觀點。因此,了解到本發明不限 於所揭示之特定具體實施例,並涵蓋如附上申請專利範圍 所定義之本發明精神及範圍内之修改。
裝 訂
k -15· 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公爱)
Claims (1)
- ABCD 55756%〇911〇438〇號專利申請案浪7· 中文申請專利範圍替換本(92年7月) 申請專利範圍 裡用以製備一具有許多積體電路形成於其上之半導 體晶圓之方法,該積體電路具有由銅組成之墊片,該方 法包括下列步驟: =由-酸性溶液清潔該晶圓及以水清洗該酸性溶液 m潔過<晶圓,以自該銅墊片中移除氧化物;及 真空包裝該晶圓。 2. =請專利範圍第!項之方法,其中該真空包裝步驟包 括真芝包裝該晶圓於一防震容器中。 3·:申請專利範圍第”員之方法,其中清潔步驟包括將該 日印圓浸至一h2so4溶液中。 其中清潔步驟包括將; 進一步包括該步驟為; 4·如申請專利範圍第1項之方法 晶圓浸至一hno3溶液中。 5·如申請專利範圍第丨項之方法 用一抗氧化劑活化劑至該銅墊片表面。 6. 如申請專利範圍第5項之方法,進—步包括該步驟為在 用孩抗氧化劑活化劑後以水清洗該晶圓及弄乾該水 洗過之晶圓。 7. 如申請專利範圍第!項之方法,進—步包括該步驟為形 一非常薄鈍化層於該銅墊片表面上。 8. 如申請專利範”7項之方法,其中該形成—純化層之 驟包括濺鍍一鈍化材料於該銅墊片表面上。 9·如申請專利範圍第8項之方法,其中該濺鍍鈍化層係約 U亳微米厚。 10·如申請專利範圍第9項之方法,其中該純化材料包括链 本紙張尺度適樣準(CNS) M規格ϋ297公釐) 557560 A8 B8 C8 D8 申請專利範圍 踢種用以製備一具有許多積體電路形成於其上之半導 且曰口圓之方法,該積體電路具有由銅組成之墊片,該方 法包括下列步驟: 、藉由電漿清潔該銅墊片以自該銅墊片移除氧化物;形 成一非常薄鈍化層於該銅墊片表面上;以及真空包裝該 晶圓。 12·如申請專利範圍第η項之方法,其中該電漿清潔係使用 約5-10%氫及約9(μ95〇/()氬來執行。 13. 如申請專利範圍第㈣之方法,其中該電漿清潔係在一 介於約5至20毫托耳間之超低壓力下執行。 14. 如申請專利範圍第13項之方法,其中該電漿清潔係使用 一功率約為800-1 000毫瓦來執行。 15. —種用以製備一具有許多積體電路形成於其上之半導 體晶圓之方法,該積體電路具有由銅組成之墊片,該方 法包括下列步驟: 經由電漿清潔該銅整片以自該銅#片移除氧化物;以 及真空包裝該晶圓。 々申叫專利範圍第15項《方法,其中該電衆清潔係使用 約5-10%氫及約9〇·95。/。氬來執行。 17.-種用以製備一具有許多積體電路形成於其上之半導 體晶圓之方法’該積體電路具有由銅組成之墊片,該方 法包括下列步驟: 以一酸性溶液清潔該晶圓; 以水清洗該酸清潔過之晶圓; -2 - 本紙張尺度適用中國國家標準(CNS) Α4規格(210 X 297公釐) 裝 訂 557560施用一柷氧化劑活化劑至該銅塾片表面; 在應用該抗氧化劑活化劑後以水清洗該晶圓; 弄乾該水清洗過之晶圓;及 真空包裝該晶圓於一防震容器中。 如申請專利範圍第17項之方法,其中清潔步驟包括將晶 圓浸至一 h2so4溶液中。 19.如申請專利範圍第17項之方法’其中清潔步驟包括將該 晶圓浸至一 HN 0 3溶液中。 20·—種用以製備一具有許多積體電路形成於其上之半導 體晶圓之方法,該積體電路具有由鋼組成之墊片,該方 法包括下列步驟: 使用約5-10%氫及約90-95%氬來電漿清潔該銅墊片; 在該銅墊片之一表面上濺鍍一非常薄層之鈍化材料 ,該鈍化層具有一約1-5毫微米厚度;及 真空包裝該晶圓於一防震容器中。 21·—種以一銅線電性連接一積體電路之一銅墊片與一引 線框之一墊片之方法,包括下列步驟: 使用約5-10%氫及約90-95%氬來電漿清潔該銅墊片; 及 打線該銅線至該清潔過之銅墊片及該引線框墊片。 22.如申請專利範圍第21項之方法,其中該電漿清潔係在_ 約為5至2 0毫托耳之超低壓力下執行。 23·如申請專利範圍第2 1項之方法,其中該電漿清潔係使用 一約為800-1000毫瓦之功率來執行。 -3- 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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JP3247211B2 (ja) | 1993-08-02 | 2002-01-15 | 富士通株式会社 | 配線用銅膜表面の酸化銅除去方法 |
KR100295429B1 (ko) | 1997-12-29 | 2001-10-24 | 윤종용 | 웨이퍼의포장방법 |
US6355571B1 (en) * | 1998-11-17 | 2002-03-12 | Applied Materials, Inc. | Method and apparatus for reducing copper oxidation and contamination in a semiconductor device |
US6358847B1 (en) | 1999-03-31 | 2002-03-19 | Lam Research Corporation | Method for enabling conventional wire bonding to copper-based bond pad features |
US6440854B1 (en) * | 2001-02-02 | 2002-08-27 | Novellus Systems, Inc. | Anti-agglomeration of copper seed layers in integrated circuit metalization |
-
2001
- 2001-03-12 US US09/803,749 patent/US6693020B2/en not_active Expired - Lifetime
-
2002
- 2002-02-08 JP JP2002572633A patent/JP4056394B2/ja not_active Expired - Fee Related
- 2002-02-08 WO PCT/US2002/003807 patent/WO2002073687A2/en active IP Right Grant
- 2002-02-08 DE DE60214159T patent/DE60214159T2/de not_active Expired - Lifetime
- 2002-02-08 EP EP02707747A patent/EP1388167B1/en not_active Expired - Lifetime
- 2002-02-08 AU AU2002242136A patent/AU2002242136A1/en not_active Abandoned
- 2002-03-08 TW TW091104380A patent/TW557560B/zh not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP1388167A2 (en) | 2004-02-11 |
JP2004527114A (ja) | 2004-09-02 |
WO2002073687A2 (en) | 2002-09-19 |
US6693020B2 (en) | 2004-02-17 |
DE60214159D1 (de) | 2006-10-05 |
AU2002242136A1 (en) | 2002-09-24 |
EP1388167B1 (en) | 2006-08-23 |
US20020127825A1 (en) | 2002-09-12 |
DE60214159T2 (de) | 2006-12-14 |
WO2002073687A3 (en) | 2003-11-13 |
JP4056394B2 (ja) | 2008-03-05 |
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