TW570971B - Etching composition and use thereof - Google Patents

Etching composition and use thereof Download PDF

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Publication number
TW570971B
TW570971B TW087119174A TW87119174A TW570971B TW 570971 B TW570971 B TW 570971B TW 087119174 A TW087119174 A TW 087119174A TW 87119174 A TW87119174 A TW 87119174A TW 570971 B TW570971 B TW 570971B
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TW
Taiwan
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weight
ppm
etching composition
hydrogen peroxide
item
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TW087119174A
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English (en)
Inventor
David Lee Rath
Ravikumar Ramachandran
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Ibm
Siemens Ag
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Publication of TW570971B publication Critical patent/TW570971B/zh

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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004Photosensitive materials
    • G03F7/0041Photosensitive materials providing an etching agent upon exposure
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D9/00Chemical paint or ink removers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K13/00Etching, surface-brightening or pickling compositions
    • C09K13/04Etching, surface-brightening or pickling compositions containing an inorganic acid
    • C09K13/08Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/39Organic or inorganic per-compounds
    • C11D3/3947Liquid compositions
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02Inorganic compounds
    • C11D7/04Water-soluble compounds
    • C11D7/08Acids
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20Exposure; Apparatus therefor
    • G03F7/2041Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
    • G03F7/2043Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means with the production of a chemical active agent from a fluid, e.g. an etching agent; with meterial deposition from the fluid phase, e.g. contamination resists
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26Processing photosensitive materials; Apparatus therefor
    • G03F7/42Stripping or agents therefor
    • G03F7/422Stripping or agents therefor using liquids only
    • G03F7/423Stripping or agents therefor using liquids only containing mineral acids or salts thereof, containing mineral oxidizing substances, e.g. peroxy compounds
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26Processing photosensitive materials; Apparatus therefor
    • G03F7/42Stripping or agents therefor
    • G03F7/422Stripping or agents therefor using liquids only
    • G03F7/425Stripping or agents therefor using liquids only containing mineral alkaline compounds; containing organic basic compounds, e.g. quaternary ammonium compounds; containing heterocyclic basic compounds containing nitrogen
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31Treatment 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
    • H01L21/3105After-treatment
    • H01L21/311Etching the insulating layers by chemical or physical means
    • H01L21/31105Etching inorganic layers
    • H01L21/31111Etching inorganic layers by chemical means
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31Treatment 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
    • H01L21/3105After-treatment
    • H01L21/311Etching the insulating layers by chemical or physical means
    • H01L21/31127Etching organic layers
    • H01L21/31133Etching organic layers by chemical means
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31Treatment 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
    • H01L21/3105After-treatment
    • H01L21/311Etching the insulating layers by chemical or physical means
    • H01L21/31127Etching organic layers
    • H01L21/31133Etching organic layers by chemical means
    • H01L21/31138Etching organic layers by chemical means by dry-etching
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10Objects to be cleaned
    • C11D2111/14Hard surfaces
    • C11D2111/22Electronic devices, e.g. PCBs or semiconductors

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Wood Science & Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Cleaning Or Drying Semiconductors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • ing And Chemical Polishing (AREA)
  • Drying Of Semiconductors (AREA)
  • Weting (AREA)

Description

570971 Λ . B7 五、發明説明( 説明 相關申請案 本申請案爲共待審美國專利申請案序號08/975,755之一別 部份連續案,該案係在1997年η月21日提出申請,標題爲1 蝕刻組合物及其用途",歸屬於本發明之讓受人,而其你 爲共待審美國專利申請案序號08/832,999之一件部份連續案 ’孩案係於1997年4月4曰提出申請,其標題爲"蝕刻組合 物及其用途",歸屬於本發明之讓受人,I此兩案係以其 全文併於本文供參考。 基術範圍 本發明係關於一種蝕刻組合物,且尤其是一種能夠移除 由於先前之金屬反應性離子蝕刻程序而存在於基材上之無 機聚合體殘留物之組合物。此外,本發明係針對一種採用 本發明之蝕刻组合物以移除此種聚合體殘留物之方法。 [明背景— 經濟部中央標準局員工消費合作社印製 鋁與链合金經常在大型積體電路中被使用於”金屬艘敷" 。銘合金包括具有少量銅以減少電子遷移效應之可能性者 ,於該效應中,被施加至裝置之電流會引致銘原子 。已將少量嫌加入銘之中,以使可能在接點孔洞中發 生(電尖峰之可能性降至最低。 Λ 爲形成具有圖樣之金屬鍍敷,故進行— .^ L ^灯系列處理步驟。 其包括沈積含鋁層,塗覆光阻薄膜於該含鋁屉 、〜 薄膜中產生預定需要圖樣之影像 :’在光阻 擇邵份曝露至通過光罩或光柵之光,然 經蠖 欠可夕除光阻薄膜之 -4 本纸乐尺度適用巾g國A4規格( 570971 五'發明説明(2 ) 經曝光或未經曝光邵份,依所採用之光阻類型而定,最後 移除位在未被其餘光阻薄膜掩蓋區域中之鋁或鋁合金層。 接著,可移除其餘光阻薄膜。 更特定言之,在半導體裝置中,供BE〇L線路/互連用之 鋁/銅金屬線條,目前係藉反應性離子蝕刻程序描繪。此 種^序係涉及使用光阻,然後是反應性離子蝕刻(rie),在 氯環境中,使用二氯化硼、氣體、或任何其他含氯 反應性物種,以蝕離經曝光之鋁/銅層,使鋁/銅金屬層 構圖。但是,此種蝕刻程序會留下殘留物在金屬線條附近 ,其包括鋁心複合聚合氧化物,伴隨著使氯摻入無機基質 中。其典型上係被稱爲側壁聚合體殘留物,而當曝露至譬 如大氣空氣及/或濕度之環境時,其存在是線條腐蝕 之不易處理來源。再者,微量氯會隨著時間使氧化鋁之鈍 化層分解,並腐蝕其下方之鋁。傳統上,一般使用之含氟 化合物’且特別是氫氟酸,已被避免,因其具有使一般金 屬線條,且特別是鋁之品質減退之傾向。 經濟部中央標準局員工消費合作社印製 此外,在RIE程序後,側壁聚合體仍留在半導體晶片表面 上。此等側壁聚合體,被稱爲"聚合體柵形結構",係爲盔 機性質,並具有不同化學成份,包括鋁、矽、鈦、氧、硬 及氯。由於每一種此等成份均易於反應及/或干擾半導體 晶片功能,因此側壁聚合體之移除是有需要的。目前係使 用絡酸/磷酸蝕刻或溶劑爲基礎之化學方法,進行一種後 金屬RIE清理步驟。但是,關於以溶劑爲基礎之化學物質 之一種常用化學成份係爲胺,其可能會對某些光阻類型造 ____ -5- 本纸張尺度糾 ( CNsTa4^( 210^297^¥Ί ' ^-- 570971
、發明説明 2題”又稀繞酸及過氧化氫混合物爲基礎之溶液,已被 止圖私除聚合體柵形結構。但是,此等方 :功地移除所有類型之聚合體柵形結構。例如,如二 ’在其中有隔離金屬墊之區域中,現行方法並未完全 =,孩金屬,具有金屬線條密度低於半導體晶片之p車列 :域及王要爲氧化矽之圍繞區域。圖 其:指出本發明使用之解決辦法。在圖】中,係、顯::進 仃舰程序後之晶圓。賊程序之方向係藉箭頭顯示。所示 〈結構1〇可包含多層。例如,其可爲氧化物層η與導電層 12。RIE程序係選擇性地移除部份導電層,以曝蒙出氧:匕 物層。因此,只有極少甚至無殘留物留在氧化物η之表面 5,上。程序,於此情況中,係指向表面5,如藉箭頭 所不。但是,結構1G可含有111體薄膜15,覆蓋結構1〇之側 壁14與頂部13。 '或者,如圖2中所*,姓刻劑可用於未涉及聚合體姓刻 ,處理步冑。例如,可能有一些區域在氧化物層中,其中 通孔25已預先形成及充填。充填通孔25之材料,較佳爲導 電性材料。此通孔可提俣晶圓之不同階層間之電連通。I 發明之蝕刻溶液,亦可用於清理具有許多殘留物質類型之 通孔20,其係開放至通孔25。殘留物質包括但不限於氧、 石夕、碳及其下方導電層之元素。 Q此,有數種方法被抚出,以移除此側壁聚合體殘留物 及聚合體柵形結構。較受歡迎方法之一’係採用^酸/磷 酸浴。但是,此程序只有最低限度有效性。再者,鉻酸/ 6 本纸張尺度適用中國國家標準(CNS ) A4規格(21〇X297公釐) (請先閲讀背面之注意事項\^?寫本頁) _裝· 寫本 、11 經濟部中央標準局員工消費合作社印製 )/U971 五、 發明説明(4 =浴易於造成銘之-部份電化學钱刻,尤其是接近典型 子在i鎢銷釘處,於是造成鋁金屬層降解。 :此:提供-種能夠移除側壁聚合體與通孔殘留物,而 導%性材#,尤其是紹,至任何不期望之程度, 同時移除侧壁聚合體殘留物之姓刻程序,係爲一般期望的 經濟部中央標準局員工消費合作社印製 附圖簡述 料及其他特徵、方面與優點,#自下文本發明 更容易地顯而易見且更爲明瞭,其中: 圖1爲一部份半導體裝置之橫截面圖 求解決之一項問題。 圖2爲一郅份半導體裝置之橫截面圖 求解決之一項問題。 發明摘述 本發明係提供一種蝕刻組合物,其能夠移除通孔 ,而不會不利地影嚮銘線條或由其他導電性材料製 :。再者,從環境觀點考量,本發明之餘刻組合物 =可接受的。此外,此蝕刻組合物特別可用於移除 至位在隔離區域中之金屬線條之無機聚合體,者與 域比較時,於該區域中可能有較高矽濃度。田” 本發明之蝕刻組合物爲含有約〇〇1 / 土约15重量% 约0.01至約20重量%過氧化氫,或約} 土 Ά」〇 ppm臭 約0.1至約100 ppm氫氟酸之水溶液。 本發明之另一方面係關於自基材移 ^除聚合體與通 詳述而 說明本發明正尋 説明本發明正尋 殘留物 成之線 係爲完 經連附 陣列區 硫酸,氧,及 孔殘留 (請先閱讀背面之注意事項 丨_射 寫 裝 . 訂— α本頁) 本纸張尺度適用中國國家標準( 〇奶)八4規格(210'/ 297公茇) 570971 Λ ---—________五、發明説明(5 ) &.濟部中央標準局員工消費合作社印製 ,其包括使基材與含有約請至約15重量。“酸及約_ 主指重量%過氧化氫或約!至約3Gppm臭氧《水溶液 0 本發明之又其他目的與優點,對熟諳此藝者而言,將自 下又砰述而變得顯而易見,其中僅説明與描述本發明之輕 佳t體綱,其僅只是説明進行本發明所意欲涵蓋在内 (取艮好杈式而已。正如即將明白的,本發明能夠進行丑 他及不同具體實施例,且其數種細節能夠在未偏離本發明下,於各種明顯方面作修正。因此,此説明文在本性上係 欲被認爲是說明性而非限制性。 及不同模式 一 明之蝕刻組合物係爲水溶液,其含有約0.01至約15 重里/°,且衩佳爲約1至約10重量%硫酸,及約0 01至約9〇 重量%過氧化氫,α1至約· ppm氫氟酸,且較佳爲約U 約10重量%過氧化氫,或約1至約3〇PP1n且較佳爲約5至約 一 〇 ppm穴氧’其餘部份實質上爲水,且更佳係含有約〇 1至 、、\10(?興含鼠化合物,較佳爲氫氟酸。該含氟化合物並非 :二疋氫氟馱。琢含氟化合物必須對蝕刻組合物貢獻自由 心氟化物。孩含氟化合物較佳應能夠對蝕刻溶液貢獻相當 於至少約8且$容幼飞9 „ ^ 、、力2 ppm足氫氯酸。本發明之較佳组合物 —=爲力8里I °/’◦硫酸與約1.5重量%過氧化氫及其餘部份 只二上馬,又水溶液,且更佳係含有約1〇 ppm含氟化合物 爲式氣。此組合物較佳係在約35〇C之溫度下採用 更佳組合物,係爲約9重量。/。礙酸與約4 (請先閱讀背面之注意事項寫本頁 _裝_ ^^寫太· 訂 -1 - I I- --·. 570971 ,ΑΊ Β"7 五 經濟部中央標準局員工消f合作社印刮衣 、發明説明(6 重!。/。過氧化氫及其餘部份實質上爲水之水溶液,且更佳 係含有約10 ppm含氟化合物,較佳爲氫氟酸。此組合物較 佳係在約35°C之溫度下採用,而且特佳係用於移除較厚且 較黏滯之側壁聚合體。本發明之又另一更佳組合物係爲約 重1 /〇 敗、約12重量%過氧化氫及約1〇 ppm氟化氫之水 溶液。所採用之水較佳爲去離子水。 本發明之此等蝕刻組合物可以下述方式製備,將硫酸水 洛硬,譬如98重量%溶液,與過氧化氫水溶液,譬如3〇重 I %落液,及氫氟酸水溶液,譬如49重量。/。溶液混合,並 刼此等落液以提供所要之硫酸、過氧化氫及氫氟酸百分比 (量添加至水中。 含有臭氧之組合物可經由使臭氧氣體起泡進入含有所要 ^之硫酸與水之含水組合物中,或使臭氧氣體經過薄膜擴 政土水中,然後添加硬酸至水中,或藉任何其他適當方法 製備。 八 田 本發明足蝕刻組合物係移除在反應性離子钱刻後留下之 側壁聚合體殘留物,並以其移除任何被包埋之氯。I發^ 之蝕刻組合物,亦會清除通孔中之其他殘留物,包括但不 限於氧、碳、矽及其下方導電性材料之元素。再者,本發 明之蝕刻組合物,”僅會溫和地蝕刻鋁/銅線條。由‘ 已知氫氟酸會蝕刻鋁/銅,故其在蝕刻溶液中之量必須很 少。當氫氟酸在所請求姓刻溶液中之量保持很少(低^約 4〇PPm)時,氫氟酸對銘/銅之潛在不利作用係被降至最低 。在大部份情況中’未贾發現任何局部飿刻铭之註據,即 -9 本纸ί長尺度適用中國國家標準(CNS ) A4規格(210/ 297公资) B7 570971 五、發明説明( 1是在鶴銷却附近之鋁亦然。當使用先前技藝之鉻酸/磷 酸/合時’鹤似乎是充作蝕刻鋁之觸媒。其亦可在化學-機 械拋光及其他"清潔”處理步驟後,用以移除及清理殘留物 Ο 、本發明之银刻組合物,亦會造成鋁之原始天然氧化物形 成人八係充作鈍化層,以防止隨後之腐蝕作用。例如,使 用:有約2.0重量。/。硫酸、約1.0重量%過氧化氫及約10 ppm 氫氟酸I蝕刻組合物,當藉由俄歇(Au與r)電子能譜法度量 時,獲得約30埃之氧化物厚度。 ^文所揭π組合物成份之相對量,有助於防止聚合體殘 田物再沈和。此係由於該蝕刻劑所具有之阳値,致使氧化 =物種與基材之氧切表面之e電位之電荷,在表面之間 =成推斥交互作用而發生。所要之阳値係藉由遵守上文所 美及成伤I里而確保。此e電位係反映出因該表面與在溶 ^中之離子(主要是氫與氫氧根)之交互作用所造成,、而在 农面上所引致(電荷。在某一溶液_値下,淨表面電荷將 .馬零’㈣石而言,其係發生在約阳至3下,而對氧化 I」在、pH 9至10下。當PH値低於此零電荷點時,在表面 上之電荷係爲正。對於在酸性媒質中被移除之聚合體声如 物之情況而言,殘留物再沈積於氧化銘表面上或矽石二: 材料上之傾向係被降低,因爲所有表面係具有相同符= 電m電位亦具有相同符號。應注意的是,在本^明 中所採用之卿之濃度(低於約⑽ppm)不會造成所形: 刻落液pH値之顯著改變。 —、 本纸張尺度㉟中關緖準7^7^格( (請先閱讀背面之注意事項寫本頁 裝 寫木 —訂---- 經濟部中央標準局員工消費合作社印製 10- 570971 五、發明説明(8 本發明之蝕刻劑可藉任, 除取人姊+, 7已知技術,用以接觸其中欲移 除水合禮或通孔殘留物之 (基材,I如凌泡在浴液中,或較 住馬噴洒孩組合物於具有釦 …銅'、泉條於其上之基材或矽晶圓 上。典型上,係將該组 去 口物在約25至约95〇C之溫度下,且 丁又佳馬在約30至約5〇。〇之、四 /皿度下,噴〉西約1至約8分鐘,典 空上馬約2分鐘。在此夕你 _ /4. ^ ’可丨吏日日圓接受去離子水沖洗 ’接著乾燥。
'月(方法亦⑰夠伴隨著銘/銅側壁聚合體殘留物, :除包埋氯之物質。藉本發明達成之銘/銅剖面,可比先 支=中者τ又平π,且對於接近鎢銷釘之 貫質上無電化學或加速蚀刻作用。 W 下表1係説明使用本發明之㈣組合物,對概之不同 旦芴速千。在表I中之百分比係爲對98重量% %沁4與3〇重 量%%〇2(其餘部份爲η2〇)之體積百分比。 ’
表I 莖氧化物之 Al/Cu或樣之钱刻速率(重量分析法) 經濟部中央標準局員工消費合作社印製 (百分 2.5 2.5 5.0 5.0 7.5 ……_ 7.5 比 過氧化物 (百分比 2.5 5.0 2.5 5.0 5.0 7.5 I虫刻速率 (埃/分 51/116 57/109 68/148 59/136 78 77 鐘) 溫度 °C 35/45 35/45 35/45 35/45 35 35 1 ______ 飿刻速率係隨著溫度而增加 衣Π係説明具有〇.5%銅合金之鋁,使用本發明餘刻組合 11 本、氏張尺度適用中關家標準(CNS ) Α4規格(210X 297公兹 570971 A7 ______ B7 五、發明説明(9 ) 物之不同敍刻速率。於表Η中之百分比係為對98重量% H2S〇4與30重量% η2〇2(其餘部份為η2〇)之體積百分比。
表II 使用硫酸/過氧化物/氫氟酸之Al/Cu之蝕刻速率 (重量分析法) HF (ppm) 蝕刻速率(埃/分鐘) 0 18 10 69 20 107173 30 、蚀刻速率係經由度量在約35°C下以30分鐘處理時間所蝕 刻之Al/Cu總量(重量分析法)進行評估。用以發展表π之溶 ’係包,約9重量%硫酸、4重量%過氧化氫以及氫氟 故其中氲氟紅之添加量係示於第一欄中,且溶液之並择 部份包含水。 ' 於上文^表I與表Π中所示之百分比,僅為舉例而已,而在 本發明範圍内之其他情況,可同樣地被採用。所度量之蝕 刻速率,係經由將此處理時間内所蝕刻之A1_cu之總量加以 平均L以進行評估。在此揭示内容中,僅說明與描述本發 明之較佳具體實施例,但如前述,應明瞭本發明能夠使用 於不同組合與環境中,且能夠在如本文中所表現之發明 念之範圍内進行改變或修正。 圖式元件符號之敘诚 5 氧化物表面 13 結構1 0之頂部 10 結構 14 結構1 0之側壁 11 乳化層 15 固體薄膜 12 導電層 20,25 通孔 ____ -12- 本紙張尺度適用t @ S家標準(CNS) A4規格(210 X 297公爱) 一 ------

Claims (1)

  1. 570971 ABCD 六、申請專利範圍 1. 一種在水溶液中之蝕刻組合物,其包含: a) 約0.01至約15重量。/。硫酸; b) 約0.1至約100 ppm之含氟化合物; 及 c) 選自包括約0.01至約20重量%過氧化氫與約1至 約30 ppm臭氧中之一種成員。 2. 如申請專利範圍第1項之姓刻組合物,其中含氟化合物 包括氫氟酸。 3. 如申請專利範圍第1項之蝕刻組合物,其包含約0.01至 約20重量。/。過氧化氫。 4. 如申請專利範圍第1項之蝕刻組合物,其包含約1至約 30 ppm之臭氧。 5. 如申請專利範圍第2項之蝕刻組合物,其包含約1至約 10重量%硫酸與約1至約10重量。/。過氧化氫,及約1至 約50 ppm之氫氟酸。 6. 如申請專利範圍第2項之蝕刻組合物,其包含約5重量 %硫酸、約12重量。/。過氧化氫及約10 ppm之氫氟酸。 7. 如申請專利範圍第1項之蝕刻組合物,其包含去離子水 (請先閱讀背面之注意事項再填寫本頁) 装--- 訂
    經濟部中央標準局員工消費合作社印製 3 本纸ft尺度適用中國國家標準(CNS ) A4規格(2丨0X 297公釐)
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