JP6430382B2 - 回路基板および半導体装置 - Google Patents
回路基板および半導体装置 Download PDFInfo
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Description
まず、セラミック基板を用意した。実施例1〜6、比較例1〜3のそれぞれにおけるセラミック基板の種類を表1に示す。なお、窒化珪素基板としては、熱伝導率90W/m・K、3点曲げ強度700MPa、縦50mm×横35mm×厚さ0.32mmの窒化珪素基板を用意した。窒化アルミニウム基板としては、熱伝導率190W/m・K、3点曲げ強度360MPa、縦50mm×横35mm×厚さ0.635mmの窒化アルミニウム基板を用意した。酸化アルミニウム基板としては、熱伝導率20W/m・K、3点曲げ強度500MPa、縦50mm×横35mm×厚さ1.0mmの酸化アルミニウム基板を用意した。
まず、セラミック基板として、縦50mm×横35mm×厚さ0.32mmの窒化珪素基板を用意した。実施例7〜10の窒化珪素基板の熱伝導率と3点曲げ強度とを表3に示す。
Claims (15)
- 第1の面と、前記第1の面に対向する第2の面とを有するセラミック基板と、
前記第1の面の上に設けられ、0.7mm以上の厚さT(mm)と、断面において85°以上95°以下の角度θの内角と、表面に設けられた25mm2以上の半導体素子搭載部とを有する第1の銅回路板と、
前記第2の面の上に設けられ、0.7mm以上の厚さT(mm)と、断面において85°以上95°以下の角度θの内角と、を有する第2の銅回路板と、
Ag、CuおよびTiを含有し、前記第1の面と前記第1の銅回路板とを接合する第1の接合層と、
Ag、CuおよびTiを含有し、前記第2の面と前記第2の銅回路板とを接合する第2の接合層と、を具備し、
前記第1の接合層は、
前記第1の銅回路板の外側にはみ出し、かつ前記第1の銅回路板の側面に沿ってはい上がるように設けられ、0.1mm以上1.0mm以下のはみ出し量W1と、0.05T(mm)以上0.6T(mm)以下のはい上がり量W2とを有する第1のはみ出し部を備え、
前記第2の接合層は、
前記第2の銅回路板の外側にはみ出し、かつ前記第2の銅回路板の側面に沿ってはい上がるように設けられ、0.1mm以上1.0mm以下のはみ出し量W1と、0.05T(mm)以上0.6T(mm)以下のはい上がり量W2とを有する第2のはみ出し部を備える、回路基板。 - 前記セラミック基板は、0.1mm以上1.0mm以下の厚さを有する窒化珪素基板である、請求項1に記載の回路基板。
- 前記セラミック基板は、600MPa以上の3点曲げ強度を有する窒化珪素基板である、請求項1または請求項2に記載の回路基板。
- 前記第1の銅回路板および前記第2の銅回路板のそれぞれは、1mm以上の前記厚さT(mm)を有する、請求項1ないし請求項3のいずれか一項に記載の回路基板。
- 前記第1の銅回路板および前記第2の銅回路板のそれぞれは、断面において89°以上91°以下の角度θの前記内角を有する、請求項1ないし請求項4のいずれか一項に記載の回路基板。
- 前記第1の銅回路板および前記第2の銅回路板のそれぞれは、7mm以下の前記厚さT(mm)を有する、請求項1ないし請求項5のいずれか一項に記載の回路基板。
- 前記第1の銅回路板は、100mm2以上の前記半導体素子搭載部を有する、請求項1ないし請求項6のいずれか一項に記載の回路基板。
- 前記第1の接合層および前記第2の接合層のそれぞれは、SnおよびInの少なくとも一方をさらに含有する、請求項1ないし請求項7のいずれか一項に記載の回路基板。
- 前記第1の銅回路板は、
前記第1の接合層との接合面に沿って設けられ、少なくともTiを含む、0.01mm以上の厚さの第1の拡散領域を有し、
前記第2の銅回路板は、
前記第2の接合層との接合面に沿って設けられ、少なくともTiを含む、0.01mm以上の厚さの第2の拡散領域を有し、
前記第1の拡散領域は、
前記第1の銅回路板の幅方向において、前記第1の接合層との接合面に沿って設けられた第1の拡散領域と、
前記第1の銅回路板の厚さ方向において、前記第1の接合層との接合面に沿って設けられた第2の拡散領域と、
前記第1の拡散領域と前記第2の拡散領域との重畳部に設けられ、前記第1の拡散領域および第2の拡散領域のTi濃度の平均値よりも前記平均値の30%以上高い濃度のTiを含む第3の拡散領域と、を有し、
前記第2の拡散領域は、
前記第2の銅回路板の幅方向において、前記第2の接合層との接合面に沿って設けられた第4の拡散領域と、
前記第2の銅回路板の厚さ方向において、前記第2の接合層との接合面に沿って設けられた第5の拡散領域と、
前記第4の拡散領域と前記第5の拡散領域との重畳部に設けられ、前記第4の拡散領域および第5の拡散領域のTi濃度の平均値よりも前記平均値の30%以上高い濃度のTiを含む第6の拡散領域と、を有する、請求項1ないし請求項8のいずれか一項に記載の回路基板。 - 前記第3の拡散領域および前記第6の拡散領域のそれぞれの面積は、400μm2以上である、請求項9に記載の回路基板。
- 前記セラミック基板に対する前記第1の銅回路板のピール強度は、10kN/m以上であり、
前記セラミック基板に対する前記第2の銅回路板のピール強度は、10kN/m以上である、請求項1ないし請求項10のいずれか一項に記載の回路基板。 - 前記セラミック基板に対する前記第1の銅回路板のピール強度は、15kN/m以上であり、
前記セラミック基板に対する前記第2の銅回路板のピール強度は、15kN/m以上である、請求項1ないし請求項10のいずれか一項に記載の回路基板。 - 1000サイクルのTCT後において、前記セラミック基板に対する前記第1の銅回路板のピール強度の低下率は、10%以下であり、
前記TCT後において、前記セラミック基板に対する前記第2の銅回路板のピール強度の低下率は、10%以下である、請求項1ないし請求項12のいずれか一項に記載の回路基板。 - 前記半導体素子搭載部は、前記第1の銅回路板の端部から0.1mm以上2mm以下の位置を含むように設けられる、請求項1ないし請求項13のいずれか一項に記載の回路基板。
- 請求項1ないし請求項14のいずれか一項に記載の回路基板と、
前記半導体素子搭載部に搭載された半導体素子と、を具備する、半導体装置。
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