JP4694305B2 - 半導体ウエハの製造方法 - Google Patents
半導体ウエハの製造方法 Download PDFInfo
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Description
ドライエッチング装置により開口部の半導体基板をエッチングして孔を形成する工程と、
レジストを除去した後、半導体基板の第2の面に絶縁膜を形成する工程と、
さらに絶縁膜の上にアルミニウム膜を形成する工程と、
フォトリソグラフィ技術により、孔の底面の一部に開口を設けるレジストパターンニング工程の後、エッチングにより孔の底面のアルミニウム膜にパターンニングして開口を設けた後に、レジストを除去する工程と、
エッチングにより、孔底面の絶縁膜と半導体ウエハの第1の面に形成された絶縁膜を除去する工程と、
半導体基板の第2の面に、金属シード層を形成する工程と、
第2の面の金属シード層に、フォトリソグラフィ技術により、孔部を含む部分に開口を有するパターンニング工程と、
メッキにより、孔を含む部分の開口に金属層を堆積させた後、レジストを除去する工程と、
孔を含む部分のパターンに、フォトリソグラフィ技術によりレジストのカバーを設けた後に、金属シード層をエッチングして、パッドと配線を半導体基板の第2の面に形成することを特徴とする半導体ウエハの製造方法を提案するものである。
ドライエッチング装置により開口部の半導体基板をエッチングして孔を形成する工程と、
レジストを除去した後、半導体基板の第2の面に絶縁膜を形成する工程と、さらにフォトリソグラフィ技術により、孔の底面の一部に開口を設けるレジストパターンニング工程と、
エッチングにより、孔底面の絶縁膜と半導体ウエハの第1の面に形成された絶縁膜を除去した後、レジストを除去する工程と
半導体ウエハの第2の面と孔の内面と底面に、金属シード層を形成する工程と、
第2の面の金属シード層に、フォトリソグラフィ技術により、孔部を含む部分に開口を有するパターンニング工程と、
メッキにより、孔を含む部分の開口に金属層を堆積させた後、レジストを除去する工程と、
孔を含む部分のパターンに、フォトリソグラフィ技術によりレジストのカバーを設けた後に、金属シード層をエッチングして、パッドと配線を半導体ウエハの第2の面に形成する工程とを有する半導体ウエハの製造方法を提案するものである。
図1は、裏面加工が完了した半導体ウエハの概略構成を示す模式的断面図、
図2は、図1の半導体ウエハの孔部分を拡大した模式的断面図、
図3は、半導体ウエハの保持と薄型化方法を示す模式的断面図、
図4〜図8は、半導体ウエハの製造において、裏面加工プロセスを説明するための模式的断面図である。
図21は、半導体チップの一部を拡大したパッド、配線を示す模式的平面図である。
Claims (1)
- (a)第1の面と、前記第1の面とは反対側の第2の面と、前記第1の面に形成された半導体素子及び第1の絶縁膜と、前記第1の面に前記第1の絶縁膜を介して形成され、前記半導体素子と電気的に接続された電極とを有する半導体基板を準備する工程と、
(b)前記半導体基板の前記第2の面に第1のレジストを形成し、その後、フォトリソグラフィ技術により、前記第1のレジストの前記電極と相対する位置に第1の開口を形成する工程と、
(c)前記第1のレジストをエッチングマスクとして使用し、ドライエッチング装置により、前記半導体基板の前記第1の開口と相対する部分を等方性エッチングし、その後、異方性エッチングして、前記第1の絶縁膜に達し、開口上部がすり鉢形状の孔を形成する工程と、
(d)前記第1のレジストを除去した後、前記半導体基板の前記第2の面上及び前記孔内に、前記半導体基板の前記第2の面、前記孔の内壁及び底面に沿う第2の絶縁膜を形成する工程と、
(e)前記第2の絶縁膜上に、前記半導体基板の前記第2の面、前記孔の内壁及び底面に沿うアルミニウム膜を形成する工程と、
(f)前記孔内を埋め込むようにして前記半導体基板の前記第2の面及び前記孔内の前記アルミニウム膜上に第2のレジストを形成し、その後、フォトリソグラフィ技術により、前記第2のレジストの前記孔の底面の一部と相対する位置に第2の開口を形成する工程と、
(g)前記第2のレジストをエッチングマスクとして使用し、前記孔内において、前記アルミニウム膜の前記第2の開口と相対する部分をエッチングして前記アルミニウム膜に第3の開口を形成する工程と、
(h)前記第2のレジストを除去した後、前記アルミニウム膜をエッチングマスクとして使用し、前記第2及び第1の絶縁膜の前記第3の開口と相対する各々の部分をエッチングにより除去して前記電極に達する第4の開口を形成する工程と、
(i)前記半導体基板の前記第2の面、前記孔の内面と底面、及び前記第4の開口内に金属シード層を形成する工程と、
(j)前記半導体基板の前記第2の面の前記金属シード層上に、フォトリソグラフィ技術により、前記孔と相対する位置に第5の開口を有する第3のレジストを形成する工程と、
(k)メッキにより、前記第5の開口内の前記金属シード層上に金属層を堆積させた後、前記第3のレジストを除去する工程と、
(l)前記孔を含む部分のパターンに、フォトリソグラフィ技術により第4のレジストのカバーを設けた後に、前記金属シード層をエッチングして、パッドと配線を前記半導体基板の前記第2の面に形成する工程と、
を有し、
前記金属シード層として、Cr膜とAu膜からなる金属シード層を形成し、前記Au膜を0.3〜2μm、前記Cr膜を、0.02μm〜0.3μmに形成したことを特徴とする半導体ウエハの製造方法。
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