JP4922891B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP4922891B2 JP4922891B2 JP2007261479A JP2007261479A JP4922891B2 JP 4922891 B2 JP4922891 B2 JP 4922891B2 JP 2007261479 A JP2007261479 A JP 2007261479A JP 2007261479 A JP2007261479 A JP 2007261479A JP 4922891 B2 JP4922891 B2 JP 4922891B2
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- columnar electrode
- opening
- overcoat film
- metal layer
- base metal
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Description
請求項2に記載の発明に係る半導体装置の製造方法は、半導体基板上に複数の配線を形成する工程と、前記配線を含む前記半導体基板上に、前記配線の接続パッド部に対応する部分に開口部を有するオーバーコート膜を形成する工程と、前記オーバーコート膜の開口部内における前記配線の接続パッド部上、前記開口部の内壁上、および前記オーバーコート膜の開口部の周囲を含む前記オーバーコート膜上に下地金属層を形成する工程と、電解メッキにより、前記オーバーコート膜の開口部内における前記配線の接続パッド部上に前記下地金属層を介して下部柱状電極部を形成し、続いて、前記下部柱状電極部上と、前記オーバーコート膜の開口部の周囲における前記オーバーコート膜上に形成された前記下地金属層上と、に上部柱状電極部を形成し、前記下部柱状電極部と前記上部柱状電極部とを含む柱状電極を形成する工程と、前記オーバーコート膜上の前記開口部の周囲以外の前記下地金属層を除去し、端面を有する有底筒状の下地金属層を形成する工程と、前記オーバーコート膜上に設けられた前記下地金属層の端面および前記柱状電極の前記上部柱状電極部を覆う半田ボールを形成する工程と、を有することを特徴とするものである。
請求項3に記載の発明に係る半導体装置の製造方法は、請求項2に記載の発明において、前記下地金属層の上面に、前記オーバーコート膜の開口部よりも大きい開口部を有するメッキレジスト膜を形成した後、前記柱状電極を形成することを特徴とするものである。
請求項4に記載の発明に係る半導体装置の製造方法は、請求項2に記載の発明において、前記柱状電極の前記上部柱状電極部を形成した後に、当該上部柱状電極部の上面に電解メッキにより半田層を形成する工程を有することを特徴とするものである。
請求項5に記載の発明に係る半導体装置の製造方法は、請求項4に記載の発明において、前記半田層を形成した後に、リフローにより、前記柱状電極の前記上部柱状電極部の表面に前記半田層からなる前記半田ボールを形成する工程を有することを特徴とするものである。
図1はこの発明の第1実施形態としての半導体装置の断面図を示す。この半導体装置は、CSPと呼ばれるもので、シリコン基板(半導体基板)1を備えている。シリコン基板1の上面には集積回路(図示せず)が設けられ、上面周辺部にはアルミニウム系金属等からなる複数の接続パッド2が集積回路に接続されて設けられている。
次に、この半導体装置の製造方法の一例について説明する。まず、図2に示すように、ウエハ状態のシリコン基板(以下、半導体ウエハ21という)の上面にアルミニウム系金属等からなる接続パッド2、酸化シリコン等からなる絶縁膜3およびポリイミド系樹脂等からなる保護膜5が形成され、接続パッド2の中央部が絶縁膜3および保護膜5に形成された開口部4、6を介して露出されたものを用意する。
次に、図1に示す半導体装置の製造方法の他の例について説明する。まず、図6に示すような工程において、図10に示すように、下地金属層11の上面にメッキレジスト膜31をパターン形成する。この場合、メッキレジスト膜31の厚さは、図6に示すメッキレジスト膜25の厚さよりもある程度厚くなっている。また、柱状電極12の上部柱状電極部12b形成領域に対応する部分におけるメッキレジスト膜31には開口部32が形成されている。
図12はこの発明の第2実施形態としての半導体装置の断面図を示す。この半導体装置において、図1に示す半導体装置と異なる点は、柱状電極12において、上部柱状電極部12bの直径は同じであるが、下部柱状電極部12a(オーバーコート膜9の開口部10)の直径をある程度小さくした点である。
図13はこの発明の第3実施形態としての半導体装置の断面図を示す。この半導体装置において、図12に示す半導体装置と異なる点は、半田ボール13の実質的な直径が同じであっても、柱状電極12の上部柱状電極部12bの高さを高くし、上部柱状電極部12bのの表面に形成された半田ボール13と上部柱状電極部12bとの接合面積を大きくした点である。このようにした場合には、半田ボール13と上部柱状電極部12bとの接合面積を大きくすることができるので、半田ボール13の上部電極部12bに対する接合強度を大きくすることができる。
図16はこの発明の第4実施形態としての半導体装置の断面図を示す。この半導体装置において、図13に示す半導体装置と異なる点は、半田ボール13を省略し、柱状電極12の上部柱状電極部12bの上面に表面処理層14を形成した点である。この場合、例えば、図14に示すような工程において、下地金属層11をメッキ電流路としたニッケルおよび金の電解メッキを連続して行なうと、メッキレジスト膜31の開口部32内の上部柱状電極部12bの上面にニッケルおよび金からなる2層構造の表面処理層14が形成される。
2 接続パッド
3 絶縁膜
5 保護膜
7 下地金属層
8 配線
9 オーバーコート膜
10 開口部
11 下地金属層
12 柱状電極
12a 下部柱状電極部
12b 上部柱状電極部
13 半田ボール
14 表面処理層
Claims (5)
- 半導体基板上に設けられた複数の配線と、
前記配線を含む前記半導体基板上に設けられ、前記配線の接続パッド部に対応する部分に開口部を有するオーバーコート膜と、
前記オーバーコート膜の開口部内における前記配線の接続パッド部上、前記開口部の内壁上、および前記オーバーコート膜の開口部の周囲における前記オーバーコート膜上に設けられた有底筒状の下地金属層と、
前記オーバーコート膜の開口部内における前記配線の接続パッド部上に前記下地金属層を介して設けられた下部柱状電極部と、前記下部柱状電極部上と前記オーバーコート膜の開口部の周囲における前記オーバーコート膜上に設けられた前記下地金属層上とに設けられた上部柱状電極部と、を有する柱状電極と、
前記オーバーコート膜の上面に設けられた前記下地金属層の端面と、前記上部柱状電極部と、を覆う半田ボールと、
を備えていることを特徴とする半導体装置。 - 半導体基板上に複数の配線を形成する工程と、
前記配線を含む前記半導体基板上に、前記配線の接続パッド部に対応する部分に開口部を有するオーバーコート膜を形成する工程と、
前記オーバーコート膜の開口部内における前記配線の接続パッド部上、前記開口部の内壁上、および前記オーバーコート膜の開口部の周囲を含む前記オーバーコート膜上に下地金属層を形成する工程と、
電解メッキにより、前記オーバーコート膜の開口部内における前記配線の接続パッド部上に前記下地金属層を介して下部柱状電極部を形成し、続いて、前記下部柱状電極部上と、前記オーバーコート膜の開口部の周囲における前記オーバーコート膜上に形成された前記下地金属層上と、に上部柱状電極部を形成し、前記下部柱状電極部と前記上部柱状電極部とを含む柱状電極を形成する工程と、
前記オーバーコート膜上の前記開口部の周囲以外の前記下地金属層を除去し、端面を有する有底筒状の下地金属層を形成する工程と、
前記オーバーコート膜上に設けられた前記下地金属層の端面および前記柱状電極の前記上部柱状電極部を覆う半田ボールを形成する工程と、
を有することを特徴とする半導体装置の製造方法。 - 請求項2に記載の発明において、前記下地金属層の上面に、前記オーバーコート膜の開口部よりも大きい開口部を有するメッキレジスト膜を形成した後、前記柱状電極を形成することを特徴とする半導体装置の製造方法。
- 請求項2に記載の発明において、前記柱状電極の前記上部柱状電極部を形成した後に、当該上部柱状電極部の上面に電解メッキにより半田層を形成する工程を有することを特徴とする半導体装置の製造方法。
- 請求項4に記載の発明において、前記半田層を形成した後に、リフローにより、前記柱状電極の前記上部柱状電極部の表面に前記半田層からなる前記半田ボールを形成する工程を有することを特徴とする半導体装置の製造方法。
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