JP2006352080A - 半導体装置の製造方法および半導体装置 - Google Patents
半導体装置の製造方法および半導体装置 Download PDFInfo
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- JP2006352080A JP2006352080A JP2006078074A JP2006078074A JP2006352080A JP 2006352080 A JP2006352080 A JP 2006352080A JP 2006078074 A JP2006078074 A JP 2006078074A JP 2006078074 A JP2006078074 A JP 2006078074A JP 2006352080 A JP2006352080 A JP 2006352080A
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- metal
- fine particles
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- semiconductor device
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Abstract
【解決手段】放熱ベースの所定の箇所に金属微粒子を含むペーストを塗布する第1塗布工程と、第1塗布工程で塗布された金属微粒子を含むペースト上に前記裏面の導体パターンを接触させるように前記絶縁基板を載置する第1載置工程と、金属微粒子を含むペースト内の金属微粒子を焼結させる加熱工程とを含むものとする。
【選択図】図1
Description
(1)酸素濃度を100〜500ppmあるいは1000Pa以下。
(2)水素あるいは窒素と水素の混合ガス雰囲気。
2 基板
3 ラミック基板
4,5 銅箔
6 パワー半導体素子
7 トスプレッダ
9 金属ナノペースト
10 金属単体膜
12 メタライズ膜
13 リードフレーム
20,21 発泡金属板
91 マイクロ粒子入り金属ナノペースト
92 マイクロ粒子入り金属単体層
Claims (21)
- 両面に導体パターンが形成された絶縁基板の、おもて面の導体パターンに半導体チップを、裏面の導体パターンに放熱ベースを接合してなる半導体装置の製造方法において、
前記放熱ベースの所定の箇所に金属微粒子を含むペーストを塗布する第1塗布工程と、
第1塗布工程で塗布された金属微粒子を含むペースト上に前記裏面の導体パターンを接触させるように前記絶縁基板を載置する第1載置工程と、
前記絶縁基板のおもて面の導体パターンの所定の箇所に金属微粒子を含むペーストを塗布する第2塗布工程と、
第2塗布工程で塗布された金属微粒子を含むペースト上に前記半導体チップを載置する載置する第2載置工程と、
前記半導体チップ上の所定の箇所に金属微粒子を含むペーストを塗布する第3塗布工程と、
第3塗布工程で塗布された金属微粒子を含むペースト上に金属放熱板を載置する第3載置工程と、
前記金属微粒子を含むペースト内の金属微粒子を焼結させる加熱工程とを含む半導体装置の製造方法。 - 前記加熱工程の前に、
前記金属放熱板上の所定の箇所に金属微粒子を含むペーストを塗布する第4塗布工程と、
第4塗布工程で塗布された金属微粒子を含むペースト上に金属導体板を載置する第4載置工程を含むことを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記加熱工程を、前記各載置工程の次にそれぞれ行うことを特徴とする請求項1または請求項2に記載の半導体装置の製造方法。
- 前記各塗布工程とその次の前記各の載置工程の間に、それぞれ予熱工程を含むことを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記載置工程は、第1,第2,第3,第4の順であって、少なくとも第4載置工程につづいて加熱工程を行うことを特徴とする請求項2に記載の半導体装置の製造方法。
- 前記加熱工程は、すべての載置工程が完了した後に一括して行うことを特徴とする請求項1または請求項2に記載の半導体装置の製造方法。
- 前記加熱工程は、前記金属微粒子を含むペーストを塗布した接合面に0.1MPa以上10MPa以下の加重を印加し、150℃以上300度以下でかつ1分以上1時間以下の条件で行うことを特徴とする請求項1乃至請求項6に記載の半導体装置の製造方法。
- 前記各塗布工程は、粒径が1nm〜20nmの、銅,銀,金,白金の少なくとも1種の金属微粒子を含むペーストを塗布する工程であることを特徴とする請求項1または請求項2に記載の半導体装置の製造方法。
- 少なくとも前記第2,第3の塗布工程は、
粒径が1nm〜20nmであって、前記加熱工程にて焼結する第1の金属微粒子と、粒径が1μm〜50μmであって、熱膨張係数が前記第1の金属微粒子より小さい第2の金属微粒子を含むペーストを塗布する工程であることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記第2の金属微粒子は、モリブデン,タングステンのうち少なくとも1種の金属微粒子であることを特徴とする請求項9に記載の半導体装置の製造方法。
- 少なくとも前記第2,第3の塗布工程は、
粒径が1nm〜20nmであって、前記加熱工程にて焼結する金属微粒子と、粒径が1μm〜50μnmであって、熱膨張係数が前記第1の金属微粒子より小さいセラミックの微粒子を含むペーストを塗布する工程であることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記第2の塗布工程は、
前記絶縁基板のおもて面の導体パターンの所定の箇所に金属微粒子を含むペーストを塗布する第2前塗布工程と、
該第2前塗布工程にて塗布したペースト上に発泡金属板を載置する発泡金属板載置工程と、
該発泡金属板上に金属微粒子を含むペーストを塗布する第2後塗布工程であることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記第3の塗布工程は、
前記半導体チップ上の所定の箇所に金属微粒子を含むペーストを塗布する第3前塗布工程と、
該第3前塗布工程にて塗布したペースト上に発泡金属板を載置する発泡金属板載置工程と、
該発泡金属板上に金属微粒子を含むペーストを塗布する第3後塗布工程であることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記第3載置工程は、
前記第3塗布工程で塗布された金属微粒子を含むペースト上に、前記金属放熱板に替えて発泡金属板を載置する工程であることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記発泡金属板は、電気抵抗が低く熱伝導率が大きい金属の金属多孔質体であることを特徴とする請求項12〜14に記載の半導体装置の製造方法。
- 前記発泡金属板は、気孔が連続した金属多孔質体であることを特徴とする請求項15に記載の半導体装置の製造方法。
- 両面に導体パターンが形成された絶縁基板の、おもて面の導体パターンに半導体チップを、裏面の導体パターンに放熱ベースを接合してなる半導体装置において、
前記放熱ベースと前記裏面の導体パターンとの間,前記絶縁基板のおもて面の導体パターンと前記半導体チップの裏面電極との間,および、前記半導体チップのおもて面電極と該電極に接合される金属放熱板との間が、金属微粒子を焼結させてなる金属単体膜で接合されていることを特徴とする半導体装置。 - 前記金属単体膜内に、該単体膜を形成する金属より熱膨張係数が小さい金属微粒子を含むことを特徴とする請求項17に記載の半導体装置。
- 前記金属単体膜内に、該単体膜を形成する金属より熱膨張係数が小さいセラミック微粒子を含むことを特徴とする請求項17に記載の半導体装置。
- 前記絶縁基板のおもて面の導体パターンと前記半導体チップの裏面電極との間に、電気抵抗が低く熱伝導率が大きい気孔が連続した金属多孔質体の発泡金属板を備えること請求項17に記載の半導体装置。
- 前記半導体チップのおもて面電極と該電極に接合される金属放熱板との間に、電気抵抗が低く熱伝導率が大きい気孔が連続した金属多孔質体の発泡金属板を備えること請求項17に記載の半導体装置。
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