JP6858939B2 - 外部接続機構、半導体装置及び積層パッケージ - Google Patents
外部接続機構、半導体装置及び積層パッケージ Download PDFInfo
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- JP6858939B2 JP6858939B2 JP2017089870A JP2017089870A JP6858939B2 JP 6858939 B2 JP6858939 B2 JP 6858939B2 JP 2017089870 A JP2017089870 A JP 2017089870A JP 2017089870 A JP2017089870 A JP 2017089870A JP 6858939 B2 JP6858939 B2 JP 6858939B2
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Description
本発明の実施の形態に係る外部接続機構を有する半導体装置は、図1及び図2に示すように、表面絶縁層12と表面絶縁層12の上面に選択的に配置された表面電極21を有する被接続基体10と、表面電極21の中央の上面の一部を露出する開口部31を有し、開口部31を囲む位置(開口部31以外の位置)において表面絶縁層12の上面及び表面電極21の周辺側を被覆するパッシベーション膜30と、表面電極21の平面パターンに対応する領域内において、開口部31からパッシベーション膜30の上面までの間を連続して被覆するバリアメタル膜40と、パッシベーション膜30の上に位置するバリアメタル膜40の上面に配置された複数のマイクロバンプ50を備える。表面絶縁層12は上面が平坦化され、表面絶縁層12中には表面配線構造(22,23)が設けられている。表面電極21は表面絶縁層12の上面に配置され、表面絶縁層12中の表面配線構造(22,23)に接続されている。
以下、図5〜図7を参照して、本発明の実施の形態に係る外部接続機構の形成方法を説明する。先ず、化学的気相成長(CVD)法等により表面絶縁層12の最上層を堆積し、CMP等によって表面絶縁層12の最上層を平坦化する。次に平坦な表面絶縁層12の最上層の上面に真空蒸着やスパッタリング法等によりAl−Si合金等の金属層を堆積する。そして金属層の上にメタライゼーション用フォトレジスト膜を塗布し、フォトリソグラフィ技術によりメタライゼーション用フォトレジスト膜をパターニングし、メタライゼーション用マスクを形成する。このメタライゼーション用マスクを用いて金属層をRIE等のドライエッチングで選択エッチして表面電極21のパターンを形成する。
本発明の実施の形態に係る積層パッケージは、例えば図10に示すように、被接続基体10が他の接続対象基体80と対向配置されて構成されている。被接続基体10と接続対象基体80とが互いに積層されることにより、被接続基体10の回路要素が接続対象基体80の回路要素に接続される。接続対象基体80は、例えば、絶縁回路基板81と、絶縁回路基板81の下面に配置された複数の配線ランド82_1,82_2,82_3と、絶縁回路基板81の内部に埋め込まれた上層内部配線83と、絶縁回路基板81を介して上層内部配線83の上に配置された下層内部配線84とを備えるインターポーザである。
上述の実施の形態においては、1つのバリアメタル膜40の上面に二次元配列された22個のマイクロバンプ50について説明したが、マイクロバンプ50aは、図11及び図12に示すように、設計上の要請に応じて一次元配列であってもよい。
また、図13及び図14に示すように、図1〜図10に例示した実施の形態に係る外部接続機構と比較して、開口部31bの内側におけるバリアメタル膜40bの上面に配置された錐体形状の補助バンプ51を更に備えるようにしてもよい。補助バンプ51は、表面電極21b及びパッシベーション膜30bの上方におけるバリアメタル膜40bの上面に配置された各マイクロバンプ50bより大きな寸法を有する。また、補助バンプ51は、被接続基体10の所定の水平面を基準面として、その基準面から測った高さが他のマイクロバンプ50にほぼ等しい。
上記のように、本発明の実施の形態を記載したが、この開示の一部をなす論述及び図面は本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなろう。
21,21a,21b 表面電極
30,30a,30b パッシベーション膜
31,31a,31b 開口部
40,40a,40b バリアメタル膜
50,50a,50b マイクロバンプ
51 補助バンプ
60 バンプ形成用フォトレジスト膜
Claims (5)
- 半導体基板、上面を平坦化して該半導体基板の上に設けられた表面絶縁層、該表面絶縁層中に設けられた表面配線構造、前記表面絶縁層の上面に選択的に配置され前記表面配線構造に接続された表面電極を有する被接続基体と、
前記表面電極の一部を露出する開口部を有し、該開口部以外の箇所で前記表面絶縁層の上面及び前記表面電極を被覆するパッシベーション膜と、
前記表面電極の平面パターンに対応する領域内において、前記開口部から前記パッシベーション膜の上面までの間を連続して被覆し、前記開口部の内側壁に沿った形状で前記開口部の内部に凹部を形成し、該凹部の底面が前記パッシベーション膜の上面に比して粗面であるバリアメタル膜と、
前記パッシベーション膜の上に位置する前記バリアメタル膜の上面に、前記開口部を除くパターンとして一定ピッチでそれぞれ配置された複数のマイクロバンプと、
を備え、前記バリアメタル膜は、前記表面電極に含まれる金属と前記マイクロバンプに含まれる金属との固相拡散反応を防止する高融点金属からなるバリア層を含むことを特徴とする半導体装置。 - 前記複数のマイクロバンプのそれぞれは、前記バリアメタル膜の上面に接合された底面を有する錐体状であることを特徴とする請求項1に記載の半導体装置。
- 前記複数のマイクロバンプの高さは、前記パッシベーション膜の厚さより低いことを特徴とする請求項1又は2に記載の半導体装置。
- 下面に配線ランドを配置した接続対象基体と、該接続対象基体と対向配置され前記配線ランドと電気的に接続される被接続基体とを備える積層パッケージであって、
前記被接続基体が、
半導体基板、上面を平坦化して該半導体基板の上に設けられた表面絶縁層、該表面絶縁層中に設けられた表面配線構造、前記表面絶縁層の上面に選択的に配置され前記表面配線構造に接続された表面電極を有する被接続基体と、
前記表面電極の一部を露出する開口部を有し、該開口部以外の箇所で前記表面絶縁層の上面及び前記表面電極を被覆するパッシベーション膜と、
前記表面電極の平面パターンに対応する領域内において、前記開口部から前記パッシベーション膜の上面までの間を連続して被覆し、前記開口部の内側壁に沿った形状で前記開口部の内部に凹部を形成し、該凹部の底面が前記パッシベーション膜の上面に比して粗面であるバリアメタル膜と、
前記パッシベーション膜の上に位置する前記バリアメタル膜の上面に、前記開口部を除くパターンとして一定ピッチでそれぞれ配置され、前記配線ランドに頂部が接する複数のマイクロバンプと、
を備え、前記バリアメタル膜は、前記表面電極に含まれる金属と前記マイクロバンプに含まれる金属との固相拡散反応を防止する高融点金属からなるバリア層を含むことを特徴とする積層パッケージ。 - 下面に配線ランドを配置した接続対象基体と、
該接続対象基体と対向配置され、半導体基板、上面を平坦化して該半導体基板の上に設けられた表面絶縁層、該表面絶縁層中に設けられた表面配線構造、前記表面絶縁層の上面に選択的に配置され前記表面配線構造に接続され、且つ前記配線ランドと電気的に接続される表面電極を有する被接続基体と、
の間において、前記配線ランドと前記表面電極とを電気的に接続する外部接続機構であって、
前記表面電極の一部を露出する開口部を有し、該開口部以外の箇所で前記表面絶縁層の上面及び前記表面電極を被覆するパッシベーション膜と、
前記表面電極の平面パターンに対応する領域内において、前記開口部から前記パッシベーション膜の上面までの間を連続して被覆し、前記開口部の内側壁に沿った形状で前記開口部の内部に凹部を形成し、該凹部の底面が前記パッシベーション膜の上面に比して粗面であるバリアメタル膜と、
前記パッシベーション膜の上に位置する前記バリアメタル膜の上面に、前記開口部を除くパターンとして一定ピッチでそれぞれ配置され、前記配線ランドに頂部が接する複数のマイクロバンプと、
を備え、前記バリアメタル膜は、前記表面電極に含まれる金属と前記マイクロバンプに含まれる金属との固相拡散反応を防止する高融点金属からなるバリア層を含むことを特徴とする外部接続機構。
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US15/849,721 US10115649B1 (en) | 2017-04-28 | 2017-12-21 | External connection mechanism, semiconductor device, and stacked package |
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US8084302B2 (en) * | 2008-03-07 | 2011-12-27 | Stats Chippac, Ltd. | Semiconductor package having semiconductor die with internal vertical interconnect structure and method therefor |
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US9385095B2 (en) * | 2010-02-26 | 2016-07-05 | Taiwan Semiconductor Manufacturing Company, Ltd. | 3D semiconductor package interposer with die cavity |
US8558392B2 (en) * | 2010-05-14 | 2013-10-15 | Stats Chippac, Ltd. | Semiconductor device and method of forming interconnect structure and mounting semiconductor die in recessed encapsulant |
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