JP2019102535A - 半導体モジュール、その製造方法及び電力変換装置 - Google Patents
半導体モジュール、その製造方法及び電力変換装置 Download PDFInfo
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Abstract
【解決手段】下面電極3よりも薄い導電薄膜7がセラミック基板2の下面において下面電極3よりも外側に設けられ、下面電極3に接続されている。下面電極3の外周からセラミック基板2の外周までの長さは、上面電極4,5の外周からセラミック基板2の外周までの長さと同じである。導電薄膜7の厚みはセラミック基板2の厚みの半分以下である。
【選択図】図1
Description
図1は、実施の形態1に係る半導体モジュールを示す断面図である。冷却用のベース板1の上にセラミック基板2が設けられている。セラミック基板2は例えば窒化ケイ素又は窒化アルミ等からなり、その厚みは200μm〜1.2mmである。
図3は、実施の形態2に係る半導体モジュールを示す断面図である。後工程で必要なはんだ付け性を確保するために、下面電極3と上面電極4,5の表面に無電解ニッケルメッキ層18を選択的に形成する。その際にセラミック基板2の下面にも無電解ニッケルメッキ層18を形成し、それをパターニングすることで導電薄膜7を形成することができる。その他、実施の形態1と同様の効果を得ることができる。
本実施の形態は、上述した実施の形態1又2に係る半導体モジュールを電力変換装置に適用したものである。電力変換装置は、例えば、インバータ装置、コンバータ装置、サーボアンプ、電源ユニットなどである。本発明は特定の電力変換装置に限定されるものではないが、以下、三相のインバータに本発明を適用した場合について説明する。
Claims (10)
- ベース板と、
前記ベース板の上に設けられたセラミック基板と、
前記セラミック基板の下面に設けられ、前記ベース板に接合された下面電極と、
前記セラミック基板の上面に設けられた上面電極と、
前記上面電極に接合された半導体チップと、
前記セラミック基板の下面において前記下面電極よりも外側に設けられ、前記下面電極に接続され、前記下面電極よりも薄い導電薄膜と、
前記セラミック基板、前記下面電極、前記上面電極、前記半導体チップ及び前記導電薄膜を封止する絶縁樹脂とを備え、
前記下面電極の外周から前記セラミック基板の外周までの長さは、前記上面電極の外周から前記セラミック基板の外周までの長さと同じであり、
前記導電薄膜の厚みは前記セラミック基板の厚みの半分以下であることを特徴とする半導体モジュール。 - 前記下面電極の外周から前記導電薄膜の外周までの長さは、前記下面電極の外周から前記セラミック基板の外周までの長さの1/3以上であることを特徴とする請求項1に記載の半導体モジュール。
- 前記半導体チップはワイドバンドギャップ半導体によって形成されていることを特徴とする請求項1又は2に記載の半導体モジュール。
- 前記導電薄膜は半導電膜であることを特徴とする請求項1〜3の何れか1項に記載の半導体モジュール。
- 前記導電薄膜は不純物をドープしたポリシリコン膜であることを特徴とする請求項1〜3の何れか1項に記載の半導体モジュール。
- 請求項1〜3の何れか1項に記載の半導体モジュールの製造方法であって、
前記セラミック基板の下面及び前記下面電極の表面にメッキ層を形成し、前記メッキ層をパターニングすることで前記導電薄膜を形成することを特徴とする半導体モジュールの製造方法。 - 請求項1〜3の何れか1項に記載の半導体モジュールの製造方法であって、
電子ビーム蒸着又はスパッタリング装置を用いて前記導電薄膜を形成することを特徴とする半導体モジュールの製造方法。 - 請求項1〜3の何れか1項に記載の半導体モジュールの製造方法であって、
前記セラミック基板の下面に前記下面電極を接合するためのろう材をパターニングすることで前記導電薄膜を形成することを特徴とする半導体モジュールの製造方法。 - 請求項1〜3の何れか1項に記載の半導体モジュールの製造方法であって、
コールドスプレーを用いて前記導電薄膜を形成することを特徴とする半導体モジュールの製造方法。 - 請求項1〜5の何れか1項に記載の半導体モジュールを有し、入力される電力を変換して出力する主変換回路と、
前記主変換回路を制御する制御信号を前記主変換回路に出力する制御回路とを備えることを特徴とする電力変換装置。
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