JP7106753B2 - ウェハレベルパッケージング方法及びパッケージング構造 - Google Patents
ウェハレベルパッケージング方法及びパッケージング構造 Download PDFInfo
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- JP7106753B2 JP7106753B2 JP2021510856A JP2021510856A JP7106753B2 JP 7106753 B2 JP7106753 B2 JP 7106753B2 JP 2021510856 A JP2021510856 A JP 2021510856A JP 2021510856 A JP2021510856 A JP 2021510856A JP 7106753 B2 JP7106753 B2 JP 7106753B2
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Description
前記金属層構造を前記第1開口において露出する前記第1チップの前記チップ背面に形成するステップでは、前記金属層構造が単層構造の底部金属層であり、前記チップ背面と前記金属層構造とを合金処理した後に、前記裏金属層を被覆する前記第2パッケージング層を前記第1開口内に形成する前に、前記底部金属層に遷移金属層を形成するステップと、前記遷移金属層に頂部金属層を形成し、前記頂部金属層、前記遷移金属層、及び前記合金処理された前記底部金属層を前記裏金属層とするステップと、をさらに含む。
Claims (20)
- ウェハレベルパッケージング方法であって、
デバイスウェハと、前記デバイスウェハ上に接合された複数の第1チップとを提供するステップであって、前記デバイスウェハは、前記第1チップを被覆する第1パッケージング層を有し、前記第1チップは、第1パッドが形成されたチップ正面と、前記チップ正面の反対側に向くチップ背面と、を含み、前記チップ正面を前記デバイスウェハに対向させるステップと、
前記第1パッケージング層をエッチングすることにより、少なくとも1つの前記第1チップを露出させる第1開口を前記第1パッケージング層内に形成するステップであって、前記第1開口において露出する前記第1チップの前記チップ背面が信号を印加するのに適するように形成されるステップと、
前記第1開口において露出する前記第1チップ、前記第1開口の底部と側壁、及び前記第1パッケージング層の頂部を被覆する金属層構造を形成するステップと、
前記チップ背面と前記金属層構造とを合金処理することにより、前記チップ背面の前記金属層構造を裏金属層とするステップと、
前記合金処理が行われた後に、前記裏金属層を被覆する第2パッケージング層を前記第1開口内に形成するステップであって、前記第2パッケージング層は、前記第1パッケージング層の頂部の前記金属層構造をさらに被覆するステップと、を含む、
ことを特徴とするウェハレベルパッケージング方法。 - 印加される前記信号は接地信号又は電圧信号である、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 印加される前記信号は接地信号であり、
前記裏金属層を被覆する前記第2パッケージング層を前記第1開口内に形成した後に、前記第2パッケージング層をエッチングすることにより、前記裏金属層を露出させる第2開口を前記第2パッケージング層内に形成するステップをさらに含む、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 印加される前記信号は電圧信号であり、
前記デバイスウェハ内に複数の第2チップが形成され、前記第2チップの前記第1チップに対向する表面に第2パッドが形成され、
前記第1パッケージング層をエッチングするステップでは、前記第1開口において前記第2パッドを露出させ、
前記金属層構造を前記第1開口において露出する前記第1チップの前記チップ背面に形成するステップでは、前記金属層構造が前記第2パッドの表面にさらに形成される、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 前記金属層構造を前記第1開口において露出する前記第1チップの前記チップ背面に形成するステップでは、前記金属層構造は、底部金属層と、前記底部金属層上に位置する遷移金属層と、前記遷移金属層上に位置する頂部金属層と、を含む、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 前記金属層構造を前記第1開口において露出する前記第1チップの前記チップ背面に形成するステップでは、前記金属層構造が単層構造の底部金属層であり、
前記チップ背面と前記金属層構造とを合金処理した後に、前記裏金属層を被覆する前記第2パッケージング層を前記第1開口内に形成する前に、前記底部金属層に遷移金属層を形成するステップと、前記遷移金属層に頂部金属層を形成し、前記頂部金属層、前記遷移金属層、及び前記合金処理された前記底部金属層を前記裏金属層とするステップと、をさらに含む、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 前記底部金属層の材料はTi、Cr、Al又はVであり、前記遷移金属層の材料はNiであり、前記頂部金属層の材料はAg又はAuである、
ことを特徴とする請求項5又は6に記載のウェハレベルパッケージング方法。 - 前記底部金属層、前記遷移金属層、及び前記頂部金属層のいずれかを形成するプロセスは、電気メッキプロセス、物理気相堆積プロセス、又は電子ビーム蒸着プロセスである、
ことを特徴とする請求項5又は6に記載のウェハレベルパッケージング方法。 - 前記合金処理のプロセスはアニールプロセスである、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 前記合金処理のパラメータは、100℃~250℃のプロセス温度と、30分~180分のプロセス時間と、を含む、
ことを特徴とする請求項1又は9に記載のウェハレベルパッケージング方法。 - 前記第1パッケージング層をエッチングするプロセスは、レーザエッチングプロセス、プラズマドライエッチングプロセス、又は反応性イオンエッチングプロセスである、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - 前記第2パッケージング層をエッチングするプロセスは、レーザエッチングプロセス、プラズマドライエッチングプロセス、又は反応性イオンエッチングプロセスである、
ことを特徴とする請求項3に記載のウェハレベルパッケージング方法。 - 前記デバイスウェハと、前記デバイスウェハ上に接合された複数の前記第1チップとを提供するステップは、溶融接合プロセスを用いて前記第1チップを前記デバイスウェハに接合するステップを含む、
ことを特徴とする請求項1に記載のウェハレベルパッケージング方法。 - ウェハレベルパッケージング構造であって、
デバイスウェハと、
前記デバイスウェハ上に接合された複数の第1チップであって、前記第1チップは、第1パッドが形成されるチップ正面と、前記チップ正面の反対側に向くチップ背面と、を含み、前記チップ正面が前記デバイスウェハに対向する複数の第1チップと、
前記デバイスウェハ上に位置し且つ前記第1チップを被覆する第1パッケージング層であって、少なくとも1つの前記第1チップを露出させる第1開口を有し、且つ前記第1開口において露出する前記第1チップの前記チップ背面が信号を印加するのに適するように形成される第1パッケージング層と、
前記第1開口において露出する前記第1チップ、前記第1開口の底部と側壁、及び前記第1パッケージング層の頂部を被覆する金属層構造であって、前記チップ背面に位置する金属層構造は、前記チップ背面と合金処理され、且つ裏金属層として用いられる金属層構造と、
前記第1開口内に位置し、且つ前記裏金属層及び前記第1パッケージング層の頂部の前記金属層構造を被覆する第2パッケージング層と、を含む、
ウェハレベルパッケージング構造。 - 印加される前記信号は接地信号又は電圧信号である、
ことを特徴とする請求項14に記載のウェハレベルパッケージング構造。 - 印加される前記信号は接地信号であり、
前記ウェハレベルパッケージング構造は、前記第2パッケージング層内に位置し、前記裏金属層を露出させる第2開口をさらに含む、
ことを特徴とする請求項14に記載のウェハレベルパッケージング構造。 - 印加される前記信号は電圧信号であり、
前記デバイスウェハ内に複数の第2チップが形成され、前記第2チップの前記第1チップに対向する表面に第2パッドが形成され、
前記第1開口において前記第2パッドを露出させ、且つ前記金属層構造は、前記第2パッドの表面に位置する、
ことを特徴とする請求項14に記載のウェハレベルパッケージング構造。 - 前記金属層構造は、底部金属層と、前記底部金属層上に位置する遷移金属層と、前記遷移金属層上に位置する頂部金属層と、を含む、
ことを特徴とする請求項14に記載のウェハレベルパッケージング構造。 - 前記底部金属層の材料はTi、Cr、Al又はVであり、前記遷移金属層の材料はNiであり、前記頂部金属層の材料はAg又はAuである、
ことを特徴とする請求項18に記載のウェハレベルパッケージング構造。 - 前記底部金属層の厚さは1000Å~5000Åであり、前記遷移金属層の厚さは1000Å~5000Åであり、前記頂部金属層の厚さは1000Å~50000Åである、
ことを特徴とする請求項18に記載のウェハレベルパッケージング構造。
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