TW200816337A - Method and apparatus for improvements in chip manufacture and design - Google Patents

Method and apparatus for improvements in chip manufacture and design Download PDF

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Publication number
TW200816337A
TW200816337A TW096128035A TW96128035A TW200816337A TW 200816337 A TW200816337 A TW 200816337A TW 096128035 A TW096128035 A TW 096128035A TW 96128035 A TW96128035 A TW 96128035A TW 200816337 A TW200816337 A TW 200816337A
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Taiwan
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holes
layer
passivation layer
pad
upper metal
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TW096128035A
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Michel Zecri
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Freescale Semiconductor Inc
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Publication of TW200816337A publication Critical patent/TW200816337A/zh

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    • H01L24/02—Bonding areas ; Manufacturing methods related thereto
    • H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
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  • Engineering & Computer Science (AREA)
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  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Wire Bonding (AREA)
  • Testing Or Measuring Of Semiconductors Or The Like (AREA)

Description

200816337 九、發明說明： 【發明所屬之技術領域】 此發明係關於一種改良晶片製造及設計之方法及裝置， 其特別（但不侷限於此）關於金屬層中之焊墊或凸塊之增加 堅固性與定錨。 【先前技術】 晶片技術不斷變化，一般而言，此意味著進一步減小尺 寸。每次尺寸減小均帶來更多必須克服之問題。尤其對於 較小器件，出現之主要問題之一係晶片之強度或堅固性。 此係晶片所有部分中之情況，但更可能係執行探測或其他 類型測試之區域中的問題。 在關於微技術（即尺寸為〜1 〇-6m)領域之許多文件中已論 述測試力擴展問題。例如，US 65 63226 B2(Motorola)與US 6717270(Motorola)說明鈍化層上探針（pop);鈍化層上焊 接物（BOP)及活化層上焊接物（B〇A)程序之使用。 US 200005/0121803 A1係關於一種内部加強焊墊。該加 強焊墊具有一非平坦介電結構及一遵循此非平坦介電結構 之金屬焊接層。此發明需要一雙鑲嵌焊接表面（其需要一 具許多步驟之極複雜程序）。US 6531384 B1揭示一種所謂 裝甲焊塾。此專利講述一具許多銅金屬島狀件1 %其在絕 緣體14上延伸）之結構。此外，在匕專利涉及相同區域中之 焊接與探測。金屬介電圖案係一最上部金屬（例如鋁）且不 2小間距焊墊相容。此亦限制活化層上焊接物（BOA)之相 容性，因為必須藉由下部金屬層來電連接焊接表面。銅島 123297.doc 200816337 狀件與鈍化層之交替提供垂直連接性。為了製造銅島狀件 與鈍化層之此交替，需要許多額外處理步驟，其會使製造 器件之成本與時間增加。 【發明内容】 本發明提供一種隨附申請專利範圍中所說明之方法及裝 置。 【實施方式】 參考圖1，顯示一奈米技術主動器件10〇。可在一石夕基底 上生產該器件且其可為諸如MOSFET、二極體等物。將石夕 層顯示為102。該器件係由複數個金屬與絕緣體之層 1〇4(其間適當形成通道與其他連接1〇6)所組成。該等層之 性質及設計可取決於器件之特定性質。金屬層通常係由銅 或任何其他合適金屬形成，而絕緣體層可由適於所需程序 及器件的任何介電材料形成。依據晶片之最後設計形成最 上邓金屬層108。接著，在晶片表面上塗敷一鈍化層〗丨〇並 適當加以圖案化以允許在導線焊接區域112中進行焊接。 鈍化層之圖案化係類似於上部金屬層1〇8之圖案化，以便 其中有與金屬層中之任何孔實質上相對應的孔。下面更詳 細說明此等孔之原因。在探針區118之區域中將兩此類孔 標記為114與116。塗敷一焊墊層（鋁層）12〇且在探針區或探 針區域118之表面中圖案化許多鈍化通道122。焊墊層12〇 可由銅、鋁或任何其他合適材料形成且可不覆蓋器件之整 個表面，而是位於各區或區域之處。在共同待審申請案 SC14021CF(其係與本申請案同一曰期申請且以引用方式併 123297.doc 200816337 入本文）中更詳細說明鈍化通道122之功能。 探針124與探測區域接觸，並施加一力。由於通道存在 於探針下方之事實，所以探測應力並不全部集中於一特定 點上；實際上，探針之最大應力係遍佈在通道周圍之所有 區域上。鈍化空間上方之探針上之圖案化通道可使探測應 力有效分散。執行探測程序且晶片已通過必需之測試後， 可接著將導線焊接126附著於導線焊接區域丨12。
可在探針與導線焊接區域兩者上方圖案化通道。此作業 對於在導線焊接區域或凸塊區域（用於凸塊化之區域）上方 執行任何測試之情況下可能有用。此外，圖案化與整個層 120之圖案化相同，其意味著可採用較不複雜的製造程 序0 可以任何方式成形純化通道，例如方形、蜂窩狀、圓形 等。孔之形狀與尺寸乃以使孔小於探針尖端而使尖端不合 抵達孔邊緣的方式來建構。該等孔可具有（例如）斜切或^ 似邊緣。此外，若對於不同孔形狀能滿足以上提出之各種 一般設計需要’則對通道之形狀、方位、㈣等無限制。 現參考圖2顯示鈍化層之區域的更詳細圖式。所示區域 包括其上具有鈍化層110之晶片最上部層108。亦更詳細顯 示鈍化層中之孔114與116。鈍化層u 儿嘈110與金屬層108稍微重 疊以提供-伸出區域2〇〇。塗敷焊墊層12叫，一 入孔中並沿著伸出區域之一部分 ^ I刀長度延伸以形成錨202 〇 該錯有效，，鉤，，在孔之邊緣周圍，隨著金屬固化形成-附著 至此之附著物。應明白，可以任何其他合適方法形成該錯 123297.doc 200816337 或定錨點且本發明不受限於藉由已熔化金屬之流動及其固 化來形成該錨或定錨點。 圖3從上面顯示晶片3〇〇之最上部金屬層。該頂部表面包 括複數個孔302(其採用304處一般顯示之柵袼的形式）。在 該圖式中，柵格並不遍及頂部金屬層之整個表面延伸，不 過若環境規定此需要則其可如此延伸。此外，該層可為許 多區域（而非一層）。將該等孔顯示為方孔，不過同樣不需 要情況如此。該等孔可具有任何形狀與尺寸。塗敷鈍化層 時保留頂部金屬層之柵格格式，以便從上面仍可看到該等 孔。由於由鈍化層所形成之伸出區域之存在，該等孔會稍 极小一些。因此，塗敷焊墊時，已熔化金屬進入各孔302 並於其中形成一銷。 術語錨係用作形成於孔中且延伸至伸出區域之區域中之 金屬插塞之術語。不過，應明白，該錨可採用許多不同形 狀及开> 式。術語錨包括具有相同功能（即，將焊墊層之一 額外附著元件添加至鈍化層之功能）的任何其他類型緊 固、固定或連接構件。 必須涊真決定伸出區域之尺寸以便錨之金屬不與最上部 金屬層108接觸及造成短路等。該決定可取決於所使用金 屬之類型；金屬之流動性；孔與伸出物之尺寸；所有層之 材料之性質及/或晶片設計及尺寸的其他細節。錨與金屬 層108間之最小距離取決於針對所考量技術所應用以避免 在最後晶片中出現任何電問題的設計規則。 鋁層120係可能發生焊接或探測之晶片上之層的一範 123297.doc 200816337 例。在也可應用及使用該等定錯點的其他情況下，可能存 在其他類型之層。例如’在晶片上不同位置處形成之各種 不同材料之層。所需要的僅僅係在鈍化層上存在上部層或 區域，其之形成係為了形成上述定錨點。 定錯點之添加提供焊墊層之改良焊塾可靠性。在（例如） 剝離測試中可展現此點。料依據本發明之—具體實施例 所❿成具有岛之X測試晶片，此類剝離測試之結果具有 100%之成功率。 由於該似此狀形成方式，可針對選路自由使用POP 或焊墊下方之最後金屬層，其針對依據本發明之一具體實 施例之器件開發更多功H此外，與無本發明之;;具體 實施例之優點的相同類型晶片相比，t明顯提高焊塾之機 械能力。此外，本發明之一具體實施例之焊墊提供探測與 焊接應用期間之降低破裂危險性，其因此致能使用一更大 程序視窗。 如先前所述，存在許多鈍化通道122，其可包含於焊墊 層120之上部表面中。如共同待審申請案SC14021CF中所 述’此等通道增加執行探測測試時器件表面可承受之應 力。從圖2中可看到，通道122與孔114及116可對齊。換言 之，鈍化通道係位於孔上方或部分位於孔上方。若情況如 此，則尤其在任何探測或焊接操作期間或一般而言對於任 何裝配與測試操作，晶片中仍存在更大強度及堅固性。 現參考圖4說明製造任何晶片（其包括一錨，例如上述 錨）之步驟。視晶片設計及需要而定以正常方式製造晶片 123297.doc 200816337 (步驟400)。塗敷該晶片之最上部或頂部金屬層（步驟 402)。可藉由任何合適程序來執行此步驟。最上部金屬層 包括其表面上之許多孔（其有時稱為環形物）。接著形成鈍 化層以便在需要焊墊定錨之任何區域中保留該等孔（步驟 404)。接著塗敷焊墊層或區域（步驟4〇6)。可藉由任何合適 處理方法來製造鈍化層及焊墊。 應明白，關於其中所提供之元件與範例可存在本發明之 變化例，且藉此在本文中包含此等變化例。 • 【圖式簡單說明】 圖1係依據本發明之一具體實施例的一晶片之第一具體 實施例之斷面圖； 圖2係依據本發明之一具體實施例圖丨所示鈍化層之區域 中之層的詳細斷面； 圖3係顯示依據本發明之一具體實施例之鈍化層之平面 圖的圖式；及 圖4係顯示依據本發明之一具體實施例之方法步驟的流 程圖。 【主要元件符號說明】 100 102 104 106 108 110 奈米技術主動器件 矽層 金屬與絕緣體之層 通道與其他連接 最上部金屬層 鈍化層 123297.doc 200816337 112 導線焊接區域 114 、 116 孔 118 探針區 120 焊塾層/銘層 122 鈍化通道 124 探針 126 導線焊接 200 伸出區域 202 錫 300 晶片 302 304 樹格 123297.doc -12-

Claims (1)

  1. 200816337 十、申請專利範園： 1. 一種將焊㈣定於半導體晶片之枝，料導體晶片具 或夕個孔之上部金屬表面，該方法包含以下 步驟： 在該上部金屬表面上形成一鈍化層，該鈍化層中具有 ^忒等孔貝質上對應於該上部金屬層中之該孔或各孔 且具有與該上部金屬層中之該孔或各孔實f上相同或較 小之尺寸； _ 在該鈍化層上形成該焊墊； 該方法之特徵為形成該焊墊之步驟包含·· 將該焊墊之一些材料在形成該焊墊時引入該鈍化層 一上邛金屬層中之該等孔中，藉此將該焊墊固定於該鈍 化層。 2·如請求項1之方法，其進一步包含允許該材料在該鈍化 層之表面下方流動並附著至此而不附著於該上部金屬層 以藉此形成一固定構件。 φ . 3·如叫求項2之方法，其中引入該材料之步驟包含將已熔 化材料塗敷於该純化層上以便已熔化材料進入該等孔並 沿著該純化層之下侧流動。 4·如4求項1至3中任一項之方法，其中形成該鈍化層之步 驟包含形成具有小於該金屬層中之該等孔之孔的該鈍化 層。 5·如請求項1至3中任一項之方法，其進一步包含將該等孔 形成為實質上直線狀。 123297.doc 200816337 6·如請求項i至紅 TS . . L 中任一項之方法，其進一步包含將該等孔 形成為實質上圓形·。 7 一種且有~ . _ /、 一匕括一或多個孔之上部金屬表面的半導體晶 片，該晶片進一步包含·· ^其係位於其中具有一或多個孔之該上部金 屬表面上， 該一或夕個孔與該上部金屬層之該等孔實質 /應且具有與該上部金屬層之該等孔實質上相同或 車父小之尺寸； 焊墊，其係形成於該鈍化層上； 古女 曰 y 化Si二特徵為該焊墊包含在形成該焊墊時進入該鈍 之^料屬層中之該孔或各孔以將該焊墊固定至此 8·如請求項 係小於哕上都’，其特徵為該鈍化層中之該孔或各孔 該上部金屬層中之該孔或各孔。 9. 如請求項 線狀。s之晶片’其特徵為該孔或各孔係實質上直 如月求項7或請求項8之晶片 質上圓形。 行做為該孔或各孔係實 U·如請求項7或8之晶片，其特徵為該 各孔並沿著該& $入該孔或 化層之鑲下側流動的已熔化材料。 123297.doc
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