TW593731B - Apparatus for applying a metal structure to a workpiece - Google Patents

Apparatus for applying a metal structure to a workpiece Download PDF

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Publication number
TW593731B
TW593731B TW089120978A TW89120978A TW593731B TW 593731 B TW593731 B TW 593731B TW 089120978 A TW089120978 A TW 089120978A TW 89120978 A TW89120978 A TW 89120978A TW 593731 B TW593731 B TW 593731B
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Taiwan
Prior art keywords
copper
devices
workpiece
seed layer
layer
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TW089120978A
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English (en)
Inventor
Linlin Chen
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Semitool Inc
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Priority claimed from US09/045,245 external-priority patent/US6197181B1/en
Application filed by Semitool Inc filed Critical Semitool Inc
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Publication of TW593731B publication Critical patent/TW593731B/zh

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/12—Semiconductors
    • C25D7/123—Semiconductors first coated with a seed layer or a conductive 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
    • H01L21/02—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
    • H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/38—Electroplating: Baths therefor from solutions of copper
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance
    • 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
    • H01L21/2885—Deposition of conductive or insulating materials for electrodes conducting electric current from a liquid, e.g. electrolytic deposition using an external electrical current, i.e. electro-deposition
    • 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
    • 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
    • H01L21/76868—Forming or treating discontinuous thin films, e.g. repair, enhancement or reinforcement of discontinuous thin films
    • 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
    • H01L21/76873—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers for electroplating
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/423—Plated through-holes or plated via connections characterised by electroplating method

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrodes Of Semiconductors (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

經濟部智慧財產局員工消費合作社印製 593731 A7 --- —___ B7 五、發明說明（/ ) 發明之背景 在微電子裝置的製造中，一或多層金屬化層的應用經 常爲整個製造過程中的一重要步驟。雖然金屬化可使用於 諸如讀/寫頭等分離.的微電子元件的形成，但其更常使用 於互連形成於諸如半導體工件等工件上的元件。例如，該 結構係用於互連積體電路的裝置。 瞭解在此所使用之專有名詞將有助於讀者明瞭所揭示 的主題。關於此，本揭示所使用的專有名詞的定義係列如 下。 里二金屬化層係定義爲基板外之一工件的複合層。該 複合層係包括一或多個金屬結構。 基遞i系定義爲一材料底層，而一或多層金屬化層係置 於其上。該基板可爲諸如一半導體晶圓、一陶瓷塊等等。 係定義爲至少包括一基板的物件，並可能更包括 諸如一或多層金屬化層等材料層或製造元件於該基板上。 積體電路係形成於半導體材料中以及位於半導體表面 上之介電材料中的裝置的互連組合。可能形成於半導體中 的裝置包括MOS電晶體、雙極電晶體、二極體以及擴散電 阻器。可能形成於介電質中的裝置包括薄膜電阻器與電容 器。典型地，超過100個積體電路晶粒（1C晶片）形成於 單一的八吋直徑矽晶圓上。各晶粒中所使用的裝置係以形 成於介電質中的導體路徑互連。典型地，爲介電層所隔離 之二層或更多層導體路徑係用爲互連。目前，鋁合金與氧 化矽係典型地各用爲導體與介電質。 4 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 A7 B7 五、發明說明（1) 單一晶粒上之裝置間的電訊傳遞延遲將限制積體電路 的性能。更特別地是，這些延遲將限制積體電路處理這些 電訊的速度。較大的傳遞延遲將減低積體電路處理這些電 訊的速度，而較小的傳遞延遲將增加該速度。因此，積體 電路製造商正在尋求減少傳遞延遲的方法。 對於各互連路徑而言，訊號傳遞延遲可以時間延遲r 爲其特徵。詳閱 Ε· Η· Stevens, Interconnect Technology, QMC，Inc.，July 1993。與積體電路上之電晶體間的訊號傳遞 相關的時間延遲r的槪略公式係表示如下。 r =RC ( 1+(Vsat/RIsat)) 在本方程式中，R與C各爲互連路徑的等效電阻値與 電容量，而ISAT與VSAT則各爲施加訊號於互連路徑之電晶 體的電流飽和啓始時之飽和（最大）電流以及汲極對源極 位勢。該路徑電阻値係正比於導體材料的電阻係數p。該 路徑電容量係正比於介電材料的相對介電係數IG。數値小 的r需要互連導線承載足夠大的電流密度，以使VsAT/RIsAT 的比例變小。因此，可承載高電流密度的低p導體以及低 1介電質必須使用於高性能積體電路的製造。 爲符合前述的標準，在低I介電質中的銅互連導線將 可能取代在氧化矽介電質中的鋁合金導線，以做爲最佳的 互連結構。詳閱“Copper Goes Mainstream: Low-k to Follow，，， Semiconductor International，November 1997, pp. 67-70。銅膜 電阻値係位於1.7至2.0// Qcm的範圍中；而鋁合金膜電阻 値係位於3.0至3·5// Ωcm的範圍中。 5 $^張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） I---------------^----訂--------- (請先閱讀背面之注音？事項再填寫本頁) 593731
五、發明說明（ 經濟部智慧財產局員工消費合作社印製 雖二銅具有有利的性質，但其並未如吾人所冀被廣泛 地使用爲互連材料。此乃至少部份由於沈積銅金屬化係困 難的’且另由於需要使用阻障層材料。使用阻障層乃肇因 於銅易於擴散進入砂接合，並改變形成於基板中之半導體 裝置的電性。由諸如氮化鈦、氮化鉅等所組成的阻障層必 須在沈積一銅層之前置於矽接合與任何中間層上，以避免 該擴散。 施加銅金屬化於半導體工件上的製程已於近年被大量 地開發出來。一製程係化學氣相沈積法（C:VC))，其中一 薄的銅膜係以熱分解法和/或氣相銅組成物的反應而形成 於阻障層表面上。雖然CVE)製程可產生規則一致的銅覆蓋 於不同的表面形貌上’但當其使用於完成整個金屬化層時 ，該製程係昂貴的。 另一已知的技術一物理氣相沈積法（PVD)，與CVD 製程比較’其可容易地沈積具有優良附著性的銅於阻障層 上。然而’ PVD製程的一缺點爲當其用於塡充諸如通路 (via)及溝渠等置於半導體工件表面的微結構時，其梯級覆 蓋性不佳（非規則一致的）。例如，該非規則一致的覆蓋 導致半導體裝置中之溝渠底部及特別是其側壁上有較少的 銅沈積於其上。 第1圖係舉例說明PVD銅層在溝渠中形成金屬化層平 面中的互連導線的不當沈積。如所舉例，在適量的銅沈積 於溝渠的下面部份前，該溝渠的上面部份已被關閉(pinch off) °此導致一開孔區，其嚴重地衝擊金屬化導線承載所設 6 本紙張尺度適用中國國家標準（CNS)A4規格（21〇 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員Η消費合作社印製 593731 A7 B7 五、發明說明（4) 計的電訊的能力。 銅的電化學沈積已發現爲可提供沈積銅金屬化層的最 佳成本效果法(most cost-effective manner)。除了具有經濟價 値外，該沈積技術亦提供機械性與電性適用於互連結構的 實質上規則一致的銅膜。然而，這些技術通常亦僅適用於 將銅施加於導電層。如此，在電化學沈積製程之前，通常 施加一底下的導電種子層於工件。用於將銅電沈積於一阻 障層材料上的技術至今尙未有商業上的價値。 本發明者已明瞭提供銅金屬化加工技術係所需，其中 該技術係：1)提供對於阻障層具有適當附著性的規則一致 的銅覆蓋，2)提供適當的沈積速度，以及3)具有商業價値 。本發明的裝置與製程方法符合這些需求，如下所述。 發明之簡略說明 本發明係使用一嶄新的方法以將諸如半導體工件等工 件做銅金屬化。根據本發明，一鹼性電鍍銅浴係用於將銅 電鍍於一種子層上，將銅直接電鍍於一阻障層材料上，或 者增強使用諸如PVD法沈積製程所沈積於阻障層上的超薄 銅種子層。所產生的銅層將提供塡充工件中之溝渠、孔洞 以及其他微結構的優良而規則一致的銅披覆。在用於種子 層的增強時’所形成的銅種子層將提供—^優良而規則一*致 的銅披覆，其允許使用電化學沈積技術塡充而具有優良均 勻性的銅塡充微結構。此外，以所揭示的方法電鍍的銅層 具有低片電阻値，且易於在低溫下進行退火。 如上述之所揭示的製程係可廣泛地應用於製造工件金 7 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 1·--------------l·---訂--------- (請先閱讀背面之注音？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 A7 B7 五、發明說明（y) 屬化層所使用的步驟中。該工件可爲諸如加工形成積體電 路或其他微電子元件的半導體工件。揭示一種用於增強種 子層的製程，其並非僅限於所揭示之發明中。 亦列出一種用於.施加一金屬化互連結構於具有一阻障 層沈積於工件表面上的製程。該製程包含形成一超薄金屬 種子層於阻障層上。該超薄種子層具有少於或等於約500A 的厚度，並且可以做爲後續金屬沈積用之種子層的任何材 料所形成。該材料包含諸如銅、銅合金、鋁、鋁合金、鎳 、鎳合金等等。該超薄種子層係於後續以一分離的沈積步 驟沈積額外的金屬於其上而增強，以提供一適用於主要金 屬沈積的增強種子層。該增強種子層在分佈於工件中之實 質上所有凹陷特徵側壁上的所有位置皆具有等於或大於名 義種子層厚度大約10%的厚度於工件表面外。 根據本製程之一特殊實施例，其係形成一含銅金屬化 互連結構。關於此，該超薄種子層係藉由施加電化學銅沈 積製程於半導體工件上而增強，其係使用具有錯合劑的鹼 性浴。銅錯合劑可爲由EDTA、ED以及諸如檸檬酸等聚羰 酸或其鹽類所組成的族群中所選擇的至少一種錯合劑二 亦列出適用於毯覆式電鍍、凹陷微結構的塡充電鍍以 及種子層增強電鍍的各種電鑛浴組成。用於增強種子層之 銅電鍍的較佳溶液包括硫酸銅、硼酸以及一錯合劑。該錯 合劑最好由EDTA、ED以及諸如檸檬酸等聚羰酸所組成的 族群中做選擇。該溶液亦適用於毯覆式電鍍以及凹陷微結 構的塡充電鑛。 8 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注音？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 A7 B7 五、發明說明（t) 亦列出可改良所形成之銅膜電阻値的電鍍溶液。該電 鍍溶液最好包括硫酸銅、硫酸銨以及乙二醇。該溶液亦適 用於毯覆式電鎪以及凹陷微結構的塡充電鍍。 圖式各視圖之簡略說明 第1圖係舉例完全以PVD銅所形成之互連導線的橫截 面圖。 第2A-2E圖係舉例半導體工件的各材料層以根據本發 明之一實施例施加時之橫截面圖。 第3圖係適用於增強超薄種子層之裝置的示意圖。 第4A圖係舉例使用諸如檸檬酸之聚羰酸做爲錯合劑 之電鍍溶液的電流-位勢曲線圖。 第4B圖係舉例使用EDTA (—種含胺電鍍液）做爲錯 合劑之電鑛溶液的電流-位勢曲線圖。 第4C圖係由具有硫酸錢與無硫酸錢之電鍍浴所沈積 之銅膜的退火溫度與片電阻値變化的關係圖。 第4D圖係說明具有硫酸銨與無硫酸銨之對照溶液中 的電鍍浴導電度與乙二醇濃度之函數關係的圖示。 第5圖係舉例一超薄種子層的掃瞄式電子顯微鏡照片 〇 第6A圖係舉例以檸檬酸浴增強之一超薄種子層的掃 瞄式電子顯微鏡照片。 第6B圖係舉例以EDTA浴增強之一超薄種子層的掃猫 式電子顯微鏡照片。 第7圖係適用於完成所揭示之種子層增強步驟的半導 9 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注意事項再填寫本頁) 593731 經濟部智慧財產局員工消費合作社印製 A7 ______B7^___ 五、發明說明（2 ) 體製造導線的截面示意圖。 發明之細節說明 本發明係使用一嶄新的方法以將銅金屬化施加於諸如 半導體工件等工件上。根據本發明，一鹼性電解銅浴係用 於將銅電鍍於一種子層上，將銅直接電鍍於一阻障層材料 上’或者增強已使用諸如PVD法沈積製程所沈積於阻障層 上的一超薄銅種子層。此外，將揭示一種用於施加金屬化 層的方法。雖然所揭示的方法可與實質上許多不同金屬組 成並用，但在此所揭示的特殊實施例係集中於含銅金屬化 層的應用。關於此，一鹼性電鍍銅浴係用於增強已使用諸 如PVD法沈積製程所沈積於阻障層上的一超薄銅種子層。 該增強銅種子層提供一優良而規則一致的銅披覆，其允許 使用電化學沈積技術而以具有優良均勻性的銅層塡充溝渠 與通路。 諸如溝渠5等要以銅金屬化所塡充的微觀結構的橫截 面圖係舉例於第2A圖中，且將用於說明本發明之種子層 增強這一方面。如所示，諸如氮化鈦或氮化鉬等之薄的阻 障層10係沈積於半導體裝置表面上，或者如第2A圖所舉 例之沈積於諸如二氧化矽等介電質8層上。阻障層10係用 以避免銅遷移至形成於基板中的任何半導體裝置。依所使 用的特定阻障材料而定，諸如CVD或PVD等任何已知的 技術皆可用於沈積該阻障層。該阻障層厚度最好爲大約 100 至 300A 厚。 該阻障層沈積後，一超薄銅種子層15係沈積於阻障層 10 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） ----------------ί----訂--------- (請先閱讀背面之注意事項再填寫本頁) 593731 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（A ) 10上。所形成的結構係舉例於第2B圖中。該銅種子層15 最好係使用諸如CVD或PVD法氣相沈積技術形成。爲使 其具有適當的附著性與銅覆蓋，一相對爲厚（ 1000A)的銅 種子層通常係所需的.。然而，當PVD沈積法用於施加該種 子層時，該厚的種子層將導致有關小尺寸溝渠之關閉的問 題。 相對於傳統式種子層施加的觀念，所舉例之實施例的 銅種子層15係超薄，其具有大約50至大約500A的厚度， 最好爲大約100至250A，而大約200A最佳。該超薄銅種 子層可使用CVD或PVD法沈積，或結合二者。然而，PVD 法係較佳的施加製程，因爲其可容易地沈積具有優良附著 性的銅於阻障層10上。藉著沈積一超薄銅種子層，而非沈 積習知技藝所使用的厚種子層，則可避免溝渠的關閉。 使用超薄種子層15通常會產生一些本身的問題。這些 問題中最明顯的一個係該超薄層通常不會均勻覆蓋於阻障 層10上。此外，諸如在20上等側壁上的孔涧或非連續種 子層區域常常呈現於超薄種子層15中’而使得後續的電化 學沈積銅層無法適當地施加於區域20中。此外，超薄種子 層易於形成諸如在21的尖端，其將破壞後續電鍍沈積之金 屬層的均勻度。該尖端21將形成一高位勢區域，該區域的 銅沈積速率比較水平的區域爲快。如此，該種子層15並不 完全適用於種子層施加後之傳統電鍍技術中。 本發明者已發現若與後續電化學種子層增強技術結合 ，則可使用超薄種子層。關於此，該半導體工件係於後續 11 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注音？事項再填寫本頁) 73 3 9 五 經濟部智慧財產局員工消費合作社印製 A7 _____B7__ 發明說明（Y) 製程步驟中施加更多量的銅18，以增強種子層。額外沈積 的銅所增強的種子層係舉例於第2C圖中。如第2C圖所示 ，第2B圖的孔洞或非連續區20已塡充，而留下以銅覆蓋 的阻障層10。 該種子層增強製程最好持續至側壁梯級覆蓋，亦即在 底部側壁區域22的種子層厚度比上置於工件外面23的種 子層名義厚度之比率，應達至少1〇%的値。該側壁梯級覆 蓋最好爲至少大約20%。該側壁梯級覆蓋値係出現於實質 上所有的半導體凹陷結構中。然而，分佈於半導體工件中 的部份凹陷結構可能未達到這些側壁梯級覆蓋値。例如， 置於半導體晶圓周邊的該結構可能不會達成這些梯級覆蓋 値。相似地，在部份凹陷結構處的缺陷或污染物可能會使 其無法達成所欲的覆蓋値。置於工件外面23的種子層名義 厚度最好在500A至1600A的範圍中。 雖然在此所揭示之製程的實施例係以關於銅金屬化做 說明，但應瞭解地是在主體沈積前之超薄種子層增強的基 本原理，亦可應用於其他可電鍍的金屬或合金。該金屬包 括鐵、鎳、鈷、鋅、銅-鋅、鎳-鐵、鈷-鐵等等。 適用於增強該超薄銅種子層之裝置25的示意圖係舉例 於第3圖中。該裝置亦適用於毯覆式電鍍層和/或凹陷微 觀結構的完全塡充電鍍。如所示，諸如半導體晶圓30之半 導體工件係面向下地置於電鍍溶液浴35中。一或多個接觸 40係設置以將晶圓30連接至做爲電鍍槽陰極的電鍍電源 供應器45。一陽極50係置於電鍍浴35中，並連接至電鍍 12 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） I--------------——訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 A7 __ B7 五、發明說明（0) 電源供應器45。一擴散器55最好置於陽極50與晶圓/陰 極30間。晶圓30在增強製程中可繞軸60旋轉。在面對電 鑛浴流體之進入流的陽極50背面，可設置一介電質遮罩 65 〇 如上述，本發明的部份特性係有關於嶄新的且有用的 電鍍溶液。這些溶液可使用於毯覆式電鍍、凹陷微觀結構 的完全塡充以及種子層增強等等。用於增強該種子層的較 佳電鍍浴溶液係係鹼性銅電鍍浴，其中銅離子係與錯合劑 錯合。電鍍浴的較佳組成以及各種組成的濃度範圍如下： 1. 硫酸銅：0·03Μ至0·25Μ(最好爲0.04M); 2. 錯合劑：錯合物比上金屬之比例爲1至4，最好爲2 3. 硼酸：〇·〇1Μ至0.5Μ，最好爲0.05Μ ;以及 4. pH : 5-13，最好爲 9.5。 較佳的銅離子源係硫酸銅(CuS〇4)。浴中的硫酸銅濃度 最好在〇·〇3至0.25M間的範园’且最好爲大約〇·ΐΜ。 適用於本發明的錯合劑與銅離子形成穩定的錯合物， 並可避免氫氧化銅的析出。四醋化乙二胺（EDTA)、乙二 胺（ED)、檸檬酸及其鹽類，係已發現特別適用爲銅錯合 劑。浴中之錯合劑對硫酸銅的莫耳比例最好在1至4的範 圍中，且最好爲大約2。該錯合劑可單獨使用，結合另一 種錯合劑使用’或者與一或多種錯合劑結合使用。 電鍍浴最好維持在至少9.0的pH値。氫氧化鉀、氫氧 化銨、氫氧四甲基銨或氫氧化鈉，係用以將pti値調整並 13 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -----r---訂--------- (請先閱讀背面之注音？事項再填寫本頁) 593731 經濟部智慧財產局員工消費合作社印製 A7 _____B7_ 五、發明說明（丨1) 維持於9.0或以上所要的水平。檸檬酸或ED浴的較佳pH 値係大約9.5，而EDTA浴的較佳pH値則爲大約12.5。如 上述’錯合劑將可避免銅在局pH値時析出。 額外的成份亦可加入鹼性銅浴中。例如，在使用檸檬 酸或ED做爲錯合劑時，加入硼酸(H3B〇3)可維持9.5的pH 値，而當其加入含有EDTA做爲錯合劑的電鍍浴中時，其 可提供較明亮的銅沈積。若加入硼酸，其在浴中的濃度最 好爲0.01至0.5M間的範圍。 通常，浴的溫度可爲20至35t，而以25°C爲較佳溫 度。用於電解沈積銅以增強銅種子層的電流密度可爲1至 5 milliamps/cm2，而大約1至5分鐘的電鍍時間係足以增強 該銅種子層。該電鎪波形可爲諸如於50%負載循環之具有 2 msec週期的前進週期脈衝。 諸如檸檬酸之聚羰酸及其鹽類等無胺酸錯合劑，較使 用EDTA或ED爲佳。EDTA及ED包括胺基。這些胺基通 常在淸洗及烘乾後仍會留置於半導體工件表面上。特別是 諸如光蝕印製程等後續製程會因這些胺基存在所造成的反 應而劣化。該胺基可能會干擾諸如光阻材料的曝光和/或 硬化等化學反應。所以，無胺錯合劑係特別適用於光蝕印 製程在電沈積製程後的製程。 使用諸如檸檬酸等聚羰酸的另一個優點，係其銅電鍍 的電壓位勢比在含有EDTA之浴中的銅電鍍的電壓位勢爲 大。此係說明於第4A圖及第4B圖中，其中第4A圖係檸 檬酸浴之電流-位勢圖，而第4B圖係EDTA浴之電流-位勢 14 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 A7 B7 五、發明說明（/1) 圖。電鍍係發生於相對應之電流急遽增加的電壓處。該電 鍍電壓係稱爲沈積位勢，在使用檸檬酸做爲錯合劑的浴中 ，其値如第4A圖所示爲大約-1.25伏特；而在使用EDTA 做爲錯合劑的浴中，其値如第4B圖所示爲大約-1.0伏特。 電流峰値（含有檸檬酸的浴爲70,70‘，而含有EDTA的浴 爲72,72’）係極限峰値，主要取決於電鍍溶液中的質量傳 遞及銅離子濃度。如所示，電流値及電鍍位勢的大小係稍 微取決於基板材料。不同的基板所產生的結果係說明於第 4A圖及第4B圖中，其中70及72係銅基板材料的曲線， 而70‘及72’係由具有氧化銅塗覆之銅所組成的銅基板材料 的曲線。應注意的是，在相同的電解質中，氧化的銅會形 成額外的峰値。這些峰値係與鹼性電化學銅沈積前之氧化 銅變爲金屬銅的電化學還原反應有關。 其確信，在鹼性電鑛浴中以較高的電鍍位勢所電鍍的 銅層，對於底下阻障層的附著性，較在酸性電鍍浴中以較 低的電鍍位勢所電鍍的銅層更大。爲將銅附著於阻障材料 ，係認爲有足夠能量的銅離子必須侵入阻障層表面，以滲 入阻障層表面上的薄氧化或污染層。因此確信，以較高的 電鍍位勢所沈積的銅層對於電鍍製程期間所曝露的阻障層 ，比使用較小的電鍍位勢所電鍍的銅層的附著性更佳。此 因素再加上PVD銅與電化學沈積銅間的銅間化學鍵之因素 ，將提供具有優良電性及阻障層附著性的增強種子層。言亥 特性亦爲用於毯覆式電鍍、完全塡充電鑛及佈局圖案電鍍 等等的膜所欲者。 15 ^紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐) 一 '' ----------------r---訂--------- (請先閱讀背面之注意事項再填寫本頁，> 經濟部智慧財產局員工消費合作社印製 593731 A7 B7 五、發明說明（ 其已發現所沈積之銅膜的電阻係直接與電鍍浴溶液的 電阻相關。因此，用於降低溶液電阻的添加劑將使所沈積 之膜的電阻相對減少。 實驗結果顯示添加硫酸銨將明顯地減少電鍍浴溶液及 所沈積之膜的電阻。以不同的硫酸銨數量所獲得的片電阻 値係比較於第4C圖中。如所見，無論是有在高溫進行退 火或未在高溫進行退火所獲得的最高片電阻値，皆在不含 硫酸銨的電鍍浴中而得。若微量的硫酸銨加入浴中而氫氧 化銨用於調整pH値時，片電阻値將由76減少至23。隨著 硫酸銨的濃度由0.1M增加到0.5M，片電阻値將以對應的 方式連續地減少。 雖然硫酸銨可促成所沈積之銅層的片電阻値減少，但 實驗結果顯示其將減少所產生之銅膜的規則一致性。然而 ，將乙二醇加入含硫酸銨溶液可實質增加沈積膜的規則一 致性。第4D圖係說明乙二醇之濃度與含0.2M硫酸銨之電 鍍溶液的導電性間的關係。 各種具有硫酸銨之電鍍浴的較佳組成及濃度範圍係標 示如下： 1·硫酸銅：0·03Μ至0·5Μ(最好爲0.25M); 2.錯合劑：錯合物比上金屬的比例爲1至4，使用ED 時最好爲2 ; 3·硫酸銨：0.01Μ至0.5Μ，最好爲0.3Μ ;以及 4.硼酸：〇.〇〇至0.5Μ，最好爲0.2Μ。 如上述，該浴組成可用於毯覆式電鍍、佈局圖案電鍍 16 >紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）"" I--------------l·---訂·--------.^9— (請先閱讀背面之注意事項再填寫本頁) 593731 經濟部智慧財產局員工消費合作社印製 A7 B7__ 五、發明說明（/f) 、完全塡充電鍍及種子層增強。 再次參考本發明之特殊種子層增強這一方面，第2C 圖之增強種子層係適用於後續電化學銅沈積。該後續之銅 沈積可於用以增強種子層之裝置中的鹼性浴中進行。接著 可進行低溫退火製程’其將協助所沈積之銅的電阻値降低 。該低溫退火製程最好在低於大約250°C的溫度下進行， 且低於大約100°c則更佳。當低K値介電材料用來隔離銅 結構時，該退火溫度上限應選擇低於該介電材料之劣化溫 度。 雖然前述的鹼性浴組成可用於整個電化學沈積製程， 但後續的銅沈積可以於酸性環境中進行，其電鍍速率係較 在鹼性電鍍浴中爲快。關於此，該半導體工件最好傳遞至 一裝置’其中該工件係以去離子水徹底地淸洗，並隨後傳 遞至相似於第3圖之電鍍浴爲酸性的裝置。例如，一適當 的銅浴係包括170 g/Ι ΗΑ〇4、17 g/Ι銅以及70ppm的氯離 子’並有有機添加物。該有機添加物對於電鍍反應而言並 非絕對需要。然而，該有機添加物可用於產生所欲的膜特 性’並提供晶圓表面上之凹陷結構的較佳塡充。該有機添 加物可包括平衡劑、亮光劑、潤濕劑以及延展性提昇劑。 就在此沈積製程期間，溝渠5以進一步的電化學沈積銅22 層完全塡充。所得塡充的橫截面係舉例於第2D圖中。在 以J亥$法塡充後，阻障層與置於溝渠上的銅層係使用任何 適當的製程移除，而僅留下如第2E圖所示之具有銅金屬化 及阻障材料的溝渠5。 _____ Π + gi^^s)A4規格⑽χ撕公爱）-- ----------------^----訂·-------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 Α7 _ __________ Β7 五、發明說明（$) 使用鹼性電解浴以增強銅種子層，具有比使用無銅種 子層增強的酸性銅電鍍浴的特殊優點。在PVD銅種子層沈 積後，該銅種子層係典型地曝露於含氧環境中。氧很容易 地便可將金屬銅轉換成氧化銅。在銅種子層曝置於含氧環 境中後，若使用酸性銅浴將銅電鍍於該種子層上，則該酸 性銅浴可將先前所形成的氧化銅溶解，而使種子層產生孔 洞，並使沈積於種子層上的銅層具有不良的均勻性。藉著 將位於種子層表面上的任何氧化銅還原成金屬銅的方式， 使用根據所揭示之實施例的鹼性銅浴可避免該問題。鹼性 銅浴的另一個優點係：與酸性銅浴所電鍍的銅比較，其所 電鍍的銅與阻障層間有較佳的附著性。本發明之種子層增 強方面的另外優點可由下列範例得知。 範例1 具有種子層增強及無種子層增強的酸性銅電鍍之比較 半導體晶圓1、2及3各以200A的PVD銅種子層披覆 。根據本發明，晶圓1及2各有由檸檬酸及EDTA浴的種 子層增強，其組成係表列如下： 晶圓1用的浴：0.1M CuS〇4+0.2M檸檬酸+0.05M Η3β〇3 在去離子水中，pH値9.5，溫度25°C。 晶圓 2 用的浴：0.1M CUSCU+0.2M EDTA 酸+0.〇5m Η3Β〇3在去離子水中，pH値12.5，溫度。 晶圓3並無任何種子層增強。 該三晶圓隨後係於酸性銅浴中以相同條件電鍍1·5微 米的銅層。下表係於沈積具有1.5微米名義厚度的銅層後 18 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) -----r---訂--- 593731 五 經濟部智慧財產局員工消費合作社印製 A7 B7 、發明說明（/6) ，比較該三晶圓的均勻度，其係由片電阻値量測而得 表1 晶圓 增強浴 電流密度 不均勻度標準差（％，1 σ ) 1 檸檬酸 3 min. 2mA/cm2 7.321 2 EDTA 3 min. 2mA/cm2 6.233 3 Μ J 0 46.10 如表1之結果所示，與無種子層增強的均勻性(46%)比 較，根據所揭示之製程的種子層增強可提供優良的均勻度 (6至7%)。該結果係與1.5微米的電鍍銅沈積於晶圓上後 的目視檢驗相吻合。該晶圓目視檢驗顯現出晶圓電極在無 種子層增強之晶圓上之接觸點處的缺陷。 第5、6A及6B圖係使用SEM所拍攝的照片。在第5 圖中，一超薄種子層已沈積於包括諸如溝渠85之微結構的 半導體晶圓表面上。如所示，孔洞區係出現在溝渠的下面 角落。在第6A圖中，該種子層已於含有檸檬酸做爲錯合 劑的浴中以上述的方法進行增強。該增強導致規則一致的 銅種子層，其係相當適用於後續銅金屬化的電化學沈積。 第6B圖係舉例說明已在含有EDTA做爲錯合劑的浴中 做增強的種子層。所形成的種子層包含較大的晶粒尺寸， 其係由溝渠側壁凸出。這些側壁晶粒凸出將使後續溝渠電 化學沈積塡充變得更困難，因爲在該位置上的電鍍速率較 快，故將使後續電化學沈積變得不均勻。在具有微小尺寸 19 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注音？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 593731 A7 B7 五、發明說明（1) 的凹陷微結構中，此效應係特別明顯。所以，在塡充細小 的微結構時，最好使用諸如檸檬酸等錯合劑。使用ED做 爲錯合劑所獲得的結果可與含檸檬酸之銅浴所獲得的結果 相比擬。 第7圖係適用於執行前述製程的半導體生產線90的示 意圖。生產線90包括一氣相沈積工具或工具組95，以及 一電化學銅沈積工具或工具組100。工具/工具組95與 100間的晶圓傳遞可手動執行，或藉由一自動傳遞機構105 執行。自動傳遞機構105最好在莢形縱槽(pod)或相似的環 境中傳遞工件。或者是說，該晶圓傳遞機構105可經由與 工具/工具組接合的潔淨大氣而個別地傳遞晶圓或在一開 放式載體中傳遞。 在作業期間，氣相沈積工具/工具組95係用於將一超 薄銅種子層施加於在生產線90加工的半導體工件之至少部 份上。此舉最好使用PVD製程完成。具有超薄種子層的工 件然後個別地或整批地傳遞至工具/工具組100,其係於 諸如加工站110進行電化學種子層增強。加工站110可以 第3圖所列的方式架構。完成增強後，該工件將施以完整 的電化學沈積製程，其中銅金屬化係施加於工件至一所欲 的互連金屬化厚度。雖然此後段製程係於站110中進行， 但最好更進一步在站115中進行，其係於酸性電鍍浴中沈 積銅金屬化。在傳遞至站115之前，該工件最好在站112 中以去離子水淸洗。站110、112及115間的晶圓傳遞可以 晶圓傳遞系統120自動化進行。該電化學沈積工具組1〇〇 20 7¾尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -I-----------1---^----訂--— — — III (請先閱讀背面之注咅？事項再填寫本頁} 經濟部智慧財產局員工消費合作社印製 593731 A7 ______ B7 五、發明說明（/『） 可使用諸如由Semitool，Inc.，of Kalispell，MT所購得之型號 爲LT_210™或Equinox™的電鍍工具執行。 數個改良可在未悖離前述系統的基本教導下進行。雖 然本發明已參考一個或多個特殊實施例而實質詳細地說明 ，但熟習本技藝之人士應可瞭解地是：若干改變可於未脖 離如列於所附申請專利範圍之本發明的範疇及精神下爲之 〇 圖式主要元件符號說明 5 溝渠 8 介電層 10 阻障層 15 銅種子層 20 側壁上的孔洞或非連續種子層區域 21 尖端 22 側壁區域 25 裝置 30 半導體晶圓 35 電鍍溶液浴 40 接觸 45 電源供應器 50 陽極 55 擴散器 60 軸 65 介電質遮罩 21 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ----------------r---訂--------- (請先閱讀背面之注意事項再填寫本頁)

Claims (1)

  1. 593731 A8 B8 C8 D8 六、申請專利範圍 6. 如申請專利範圍第3項之一或多個裝置，其中該錯 合劑包括EDTA。 (請先閲讀背面之注意事項再塡寫本頁) 7. 如申請專利範圍第3項之一或多個裝置，其中該錯 合劑包括ED。 8. 如申請專利範圍第3項之一或多個裝置，其中該錯 合劑包括羧酸或其鹽類。 9. 如申請專利範圍第8項之一或多個裝置，其中該錯 合劑係檸檬酸或其鹽類。 .10.如申請專利範圍第3項之一或多個裝置，其中該電 鍍機構包括藉著使用酸性銅浴來電鍍銅到已修補種子層上 的機構。 11. 如申請專利範圍第10項之一或多個裝置，其中該 超薄種子層之電化學增強的電鍍電壓係大於在酸性銅浴中 的電鍍電壓。 12. 如申請專利範圍第11項之一或多個裝置，更包括 在將微電子工件導入電化學地施加一進一步的銅層的機構 之前，將微電子工件淸洗的機構。 13. 如申請專利範圍第1項之一或多個裝置，其中該施 加機構進一步由使用PVC製程將導電性超薄銅種子層施加 到微電子工件之阻障層表面上的機構。 14. 如申請專利範圍第1項之一或多個裝置，其中該施 加機構進一步由使用CVD製程將導電性超薄銅種子層施加 到微電子工件之阻障層表面上的機構。 15. —種用於在金屬鑲嵌(damascene)製程中將互連金屬 2 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐） 593731 A8 B8 C8 __D8 六、申請專利範圍 ....................裝·..... (請先閱讀背面之注意事項再填寫本頁) 化施加於形成微電子電路或組件之微電子工件表面上的複 數個裝置的一或多個裝置，其係於包含用於製造微電子電 路或組件之複數個裝置的生產線中，該一或多個裝置包括 使用物理氣相沉積法施加金屬種子層於微電子工件表 面_h之機構’金屬種子層一般不適於互連金屬化之整體電 化學沉積； 電化學修補金屬種子層之機構，使其適合隨後電化學 施·加金屬到一表示互連金屬化整體部分之預定厚度。 16·—種用於將金屬化互連結構施加於形成電子裝置用 之工件表面的複數個裝置的一或多個裝置，其係於包含用 於電子裝置製造之複數個裝置的生產線中，該一或多個裝 置包括： 反應器’其可接收工件之表面並然後將工件表面與銅 電鍍溶液接觸’該銅電鏟溶液包括含量爲0.03到〇.5莫耳 之硫酸銅，含量爲0.01到〇·5莫耳之硼酸，選自由ED、 EDTA及聚羧酸所組成之族群中的錯合劑且其含量爲錯合 劑對硫酸銅之莫耳比爲丨到4範圍內，含量足以增加溶液 pH到至少9的鹼性試劑； 置於與電鍍溶液電接觸之陽極；及 電能供應器，其可在工件之至少一表面上與陽極之間 供應能量以電鍍主要金屬物到工件之至少一表面上。 17· —種用於將金屬化互連結構施加於形成電子裝置用 之工件表面的複數個裝置的一或多個裝置，其係於包含用 3 本紙張尺度適用中國國家標準（CNS)A4規格(210 X 297公釐) " 593731 A8 B8 C8 D8 六、申請專利範圍 於電子裝置製造之複數個裝置的生產線中，該一或多個裝 置包括： (請先閲讀背面之注意事項再塡寫本頁) 反應器，其可接收工件之表面並然後將工件表面與銅 電鑛溶液接觸，該銅電鍍溶液包括其含量爲主要金屬物銅 離子來源之硫酸銅，硫酸銨及含量超過0到1.0莫耳的乙 二醇； 置於與電鍍溶液電接觸之陽極；及 電能供應器，其可在工件之至少一表面上與陽極之間 供應能量以電鍍主要金屬物到工件之至少一表面上。 18.如申請專利範圍第1項之一或多個裝置，其中第一 處理站包括用於電化學增強導電超薄種子層之鹼性電解浴 ，且其中第二處理站包括用於在增強的種子層上電化學沈 積整體部份之互相連接金屬化的酸性電解浴。 4 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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US6277263B1 (en) 2001-08-21
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US6811675B2 (en) 2004-11-02
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