JP5571381B2 - 垂直型ウェハ間相互接続を設けるための金属充填貫通ビア構造体 - Google Patents
垂直型ウェハ間相互接続を設けるための金属充填貫通ビア構造体 Download PDFInfo
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- JP5571381B2 JP5571381B2 JP2009521941A JP2009521941A JP5571381B2 JP 5571381 B2 JP5571381 B2 JP 5571381B2 JP 2009521941 A JP2009521941 A JP 2009521941A JP 2009521941 A JP2009521941 A JP 2009521941A JP 5571381 B2 JP5571381 B2 JP 5571381B2
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- wafer
- polyimide
- dielectric material
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- 229910052751 metal Inorganic materials 0.000 title claims description 111
- 239000002184 metal Substances 0.000 title claims description 111
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- 238000000034 method Methods 0.000 claims description 55
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Description
本発明の手法は、金属スタッドの合金形成の必要性を回避するが、なお第1ウェハから第2ウェハを貫通する連続的な金属経路を作成する。
表面上に配設された少なくとも1つの金属スタッドを有する第1ウェハと、少なくとも1つのポリイミド・コーティングされた貫通ビアを含む第2ウェハとを準備するステップと、
第1ウェハの少なくとも1つの金属スタッドを第2ウェハの少なくとも1つのポリイミド・コーティングされた貫通ビア内に挿入して連結構造体をもたらすステップと、
連結構造体を加熱して対向するポリイミド表面を結合させ、流動させて各金属スタッドを完全に包むステップと、
第2ウェハを薄層化して、少なくとも1つのポリイミド・コーティングされた貫通ビア内に配置される少なくとも1つの金属スタッドの表面を露出させるステップと、
薄層化された第2ウェハの表面上にパターン付けされたポリイミド・コーティングを形成し、少なくとも1つの金属スタッドの露出表面上に金属パッドを形成するステップと、
を含む。
表面上に配設された少なくとも1つのCuスタッドを有する第1ウェハと、少なくとも1つのポリイミド・コーティングされた貫通ビアを含む第2ウェハとを準備するステップと、
第1ウェハの少なくとも1つのCuスタッドを第2ウェハの少なくとも1つのポリイミド・コーティングされた貫通ビアに挿入して連結構造体をもたらすステップと、
連結構造体を加熱して対向するポリイミド表面を結合させ、流動させて各Cuスタッドを完全に包むステップと、
第2ウェハを薄層化して、少なくとも1つのポリイミド・コーティングされた貫通ビア内に配置された少なくとも1つのCuスタッドの表面を露出させるステップと、
薄層化された第2ウェハの表面上にパターン付けされたポリイミド・コーティングを形成し、そして少なくとも1つのCuスタッドの露出表面上にCuパッドを形成するステップと、
を含む。
第1ウェハと、第1ウェハの表面から延びる少なくとも1つの金属スタッドにより嵌合する第2ウェハとを含み、ここで、前記の少なくとも1つの金属スタッドは第1ウェハの表面から第2ウェハの対応する貫通ビア内へ延び、ポリイミド・コーティングが貫通ビア内、第1及び第2ウェハの嵌合表面上、及び、第1ウェハに嵌合しない第2ウェハの別の表面の上に存在し、そして、少なくとも1つの金属スタッドが第1ウェハから第2ウェハを貫通する連続的な金属経路をもたらす。
12:第1半導体基板
14:第1誘電体材料
16、28、30:ポリイミド・コーティング
18:金属スタッド
20:第2ウェハ(取付けウェハ)
22:第2半導体基板
24:貫通ビア
26:第2誘電体材料
32:金属パッド
50、54:デバイス領域
52:金属コンタクト
56:コンタクト開口部
58:コンタクト・パッド
Claims (12)
- 垂直型ウェハ間相互接続構造体を作成する方法であって、
表面上に配設された少なくとも1つの金属スタッドを有し、表面がポリイミド・コーティングされた第1半導体基板の第1ウェハと、少なくとも1つのポリイミド・コーティングされポリイミドのライナが形成された貫通ビアを含み、表面がポリイミド・コーティングされた第2半導体基板の第2ウェハとを準備するステップと、
前記第1ウェハの前記少なくとも1つの金属スタッドを前記第2ウェハの前記少なくとも1つのポリイミド・コーティングされポリイミドのライナが形成された貫通ビア内に挿入して連結構造体をもたらすステップと、
前記連結構造体を加熱して、前記第1半導体基板及び前記第2半導体基板の対向する前記ポリイミド・コーティングされた表面を結合させ且つ流動させて各金属スタッドを完全に包むステップと、
前記第2ウェハを薄層化して、前記少なくとも1つのポリイミド・コーティングされポリイミドのライナが形成された貫通ビア内に配置された前記少なくとも1つの金属スタッドの表面を露出させるステップと、
前記薄層化された第2ウェハの表面上にパターン付けされたポリイミド・コーティングを形成し、前記少なくとも1つの金属スタッドの前記露出表面上に金属パッドを形成するステップと、
を含む方法。 - 前記第1ウェハを前記準備するステップは、前記第1半導体基板の表面上に誘電体材料を付着するステップと、前記誘電体材料の上にポリイミド・コーティングを形成するステップと、前記誘電体材料及び前記ポリイミド・コーティングの中に開口部を設けるステップと、前記開口部を通して導電性金属を電気めっきするステップとを含む、請求項1に記載の方法。
- 前記第2ウェハを前記準備するステップは、前記第2半導体基板内に少なくとも1つの貫通ビアを形成するステップと、前記貫通ビアの露出表面及び前記第2半導体基板の部分を誘電体材料で裏打ちするステップと、前記誘電体材料の全ての露出表面上にポリイミド・コーティングを形成するステップとを含む、請求項1に記載の方法。
- 前記挿入するステップの後で、前記金属スタッドの各々は前記各貫通ビアの底壁部分を裏打ちする前記誘電体材料と直接接触する、請求項3に記載の方法。
- 前記挿入するステップの後で、前記金属スタッドの各々は前記各貫通ビアの底壁部分を裏打ちする前記誘電体材料と直接接触しない、請求項3に記載の方法。
- 垂直型ウェハ間相互接続構造体を作成する方法であって、
表面上に配設された少なくとも1つのCuスタッドを有し、表面がポリイミド・コーティングされた第1ウェハと、少なくとも1つのポリイミド・コーティングされポリイミドのライナが形成された貫通ビアを含み、表面がポリイミド・コーティングされた第2ウェハとを準備するステップと、
前記第1ウェハの前記少なくとも1つのCuスタッドを前記第2ウェハの前記少なくとも1つのポリイミド・コーティングされポリイミドのライナが形成された貫通ビアに挿入して連結構造体をもたらすステップと、
前記連結構造体を加熱して、前記第1ウェハ及び前記第2ウェハの対向する前記ポリイミド・コーティングされた表面を結合させ且つ流動させて各Cuスタッドを完全に包むステップと、
前記第2ウェハを薄層化して、前記少なくとも1つのポリイミド・コーティングされポリイミドのライナが形成された貫通ビア内に配置された前記少なくとも1つのCuスタッドの表面を露出させるステップと、
前記薄層化された第2ウェハの表面上にパターン付けされたポリイミド・コーティングを形成し、前記少なくとも1つのCuスタッドの前記露出表面上にCuパッドを形成するステップと、
を含む方法。 - 前記第1ウェハを前記準備するステップは、半導体基板の表面上に誘電体材料を付着するステップと、前記誘電体材料の上にポリイミド・コーティングを形成するステップと、前記誘電体材料及び前記ポリイミド・コーティング内に開口部を設けるステップと、前記開口部を通してCuを電気めっきするステップとを含む、請求項6に記載の方法。
- 前記第2ウェハを前記準備するステップは、半導体基板内に少なくとも1つの貫通ビアを形成するステップと、前記貫通ビアの露出表面及び前記半導体基板の部分を誘電体材料で裏打ちするステップと、前記誘電体材料の上にポリイミド・コーティングを形成するステップとを含む、請求項6に記載の方法。
- 前記挿入するステップの後で、前記Cuスタッドの各々は前記各貫通ビアの底壁部分を裏打ちする前記誘電体材料と直接接触する、請求項8に記載の方法。
- 前記挿入するステップの後で、前記Cuスタッドの各々は前記各貫通ビアの底壁部分を裏打ちする前記誘電体材料と直接接触しない、請求項8に記載の方法。
- 前記加熱するステップは、400℃より低い温度で実行される、請求項1又は6に記載の方法。
- 前記薄層化するステップは、研削、化学機械研磨又はそれらの組合せによって実行される、請求項1又は6に記載の方法。
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