JPWO2019064775A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JPWO2019064775A1 JPWO2019064775A1 JP2019544285A JP2019544285A JPWO2019064775A1 JP WO2019064775 A1 JPWO2019064775 A1 JP WO2019064775A1 JP 2019544285 A JP2019544285 A JP 2019544285A JP 2019544285 A JP2019544285 A JP 2019544285A JP WO2019064775 A1 JPWO2019064775 A1 JP WO2019064775A1
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- insulating substrate
- layer
- semiconductor device
- switching element
- semiconductor switching
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Abstract
Description
図1は、本発明の実施形態1に係る半導体装置1の構成図である。半導体装置1は、内部にIGBT(Insulated Gate Bipolar Transistor)チップ11とダイオードチップ12を搭載している。外部引出用のゲート端子15、外部引出用のエミッタ端子16、外部引出用のコレクタ端子17を半導体装置1の外部に引き出すことにより、半導体装置1はインバータ回路の一部として機能することができる。ここでは半導体装置1の内部に、2つのIGBTチップ11と1つのダイオードチップ12を配置した例を示した。
本実施形態1に係る半導体装置1においては、セラミックス材料と配線層によって構成された絶縁配線33からIGBTチップ11に向かって、突起36が突起35よりも突出している。これにより、面積の小さいゲート端子を確実に配線層と導通させることができる。
図8は、本発明の実施形態2に係る半導体装置1の断面図である。本実施形態2において、突起36は、先端(IGBTチップ11に近い側の端部)ほど細い先細り形状となっている。その他構成は実施形態1と同様である。本実施形態2においては、突起36が先細り形状であるので、リフロー工程において接合材52が軟化したときに突起36が接合材52の内部に食い込み、より確実にゲート端子を接続できる。なお、本実施形態では、事前に用意したゲート端子接続用の突起36を配線表面と拡散接合によって接合した。これ以外にも、接合材を用いた接合で突起を設けることや、配線表面にめっきを施すことで突起を設けることも可能である。
図9は、本発明の実施形態3に係る半導体装置1の断面図である。本実施形態3において、突起36はベンド構造を持ち、高さ方向の剛性が実施形態1よりも小さい。その他構成は実施形態1と同様である。突起36をゲート端子と接続するとき、突起36によってIGBTチップ11の表面が極端に強く押されると、IGBTチップ11表面の電極や内部の半導体素子が破損することが懸念される。突起36の高さ方向の剛性を小さくすることにより、IGBTチップ11表面の電極や内部の半導体素子を極端に強く押すことを確実に防止でき、より信頼性の高い半導体装置を提供できる。
図10は、本発明の実施形態4に係る半導体装置1の断面図である。本実施形態4においては、突起36に代えて、接合材52の内部に略球形状のコア材101が配置されている。その他構成は実施形態1と同様である。コア材101としては、銅球の表面にニッケルめっきし、さらにその上にSnめっきを施した銅コアボールを用いた。本実施形態4においては、コア材101の少なくとも一部を、突起35よりもIGBTチップ11に近い位置に配置する。これにより、確実にゲート端子41を配線層と接続することができる。
図11は、本発明の実施形態5に係る半導体装置1の全体構造図である。実施形態1において絶縁配線33は略長方形であるのに対して、本実施形態5において絶縁配線33は各突起36(すなわち各ゲート端子)に向かって枝分かれする形状を有している。
本発明は上記実施形態に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換える事が可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。また、各実施形態の構成の一部について他の構成の追加・削除・置換をすることができる。
11:IGBTチップ
12:ダイオードチップ
13:第1絶縁基板
14:第2絶縁基板
15:ゲート端子
16:エミッタ端子
17:コレクタ端子
18:モールド樹脂
21:第1絶縁基板の絶縁層
22:第1絶縁基板の回路層
23:第1絶縁基板の放熱層
31:第2絶縁基板の絶縁層
32:第2絶縁基板の回路層
33:絶縁配線
34:第2絶縁基板の放熱層
35:突起
36:突起
41:ゲート端子
42:エミッタ端子
43:コレクタ端子
51:接合材
52:接合材
53:接合材
101:コア材
Claims (13)
- 半導体スイッチング素子を備える半導体装置であって、
前記半導体スイッチング素子が実装された第1絶縁基板と、
絶縁層を有し、前記絶縁層の一方の表面に配線層と金属層を有する第2絶縁基板と、
を備え、
前記絶縁層の前記一方の表面と、前記第1絶縁基板の前記半導体スイッチング素子を実装した表面は、互いに対向して配置されており、
前記配線層は、前記絶縁層の前記一方の表面に形成されたセラミックス層の内部に形成されており、
前記半導体スイッチング素子のゲート端子と前記配線層は、導電材料によって形成された接続部及び第1接合材を介して電気的に接続されており、
前記半導体スイッチング素子の前記ゲート端子以外の端子と前記金属層は、第2接合材を介して電気的に接続されており、
前記絶縁層の前記一方の表面から、前記接続部の前記第1絶縁基板の側の端部までの距離は、前記絶縁層の前記一方の表面から、前記金属層の前記第1絶縁基板の側の表面までの距離よりも大きい
ことを特徴とする半導体装置。 - 前記接続部は、前記配線層から前記ゲート端子に向かって突出した突起として形成されている
ことを特徴とする請求項1記載の半導体装置。 - 前記接続部は、前記絶縁層から前記ゲート端子に向かって先細る形状を有する
ことを特徴とする請求項2記載の半導体装置。 - 前記接続部は、ばね構造を有する
ことを特徴とする請求項2記載の半導体装置。 - 前記接続部は、前記第1接合材の内部に配置されたコアとして形成されている
ことを特徴とする請求項1記載の半導体装置。 - 前記第1絶縁基板はさらに、ダイオードチップを実装しており、
前記セラミックス層は、前記第1絶縁基板と前記第2絶縁基板を対向面上に投影したとき、前記半導体スイッチング素子と重なるとともに前記ダイオードチップとは重ならない位置に形成されている
ことを特徴とする請求項1記載の半導体装置。 - 前記半導体スイッチング素子は、IGBTまたはMOSFETであり、
前記セラミックス層は、前記第1絶縁基板と前記第2絶縁基板を対向面上に投影したとき、前記半導体スイッチング素子のゲート端子と重なる位置に形成されており、
前記金属層は、前記第1絶縁基板と前記第2絶縁基板を対向面上に投影したとき、前記セラミックス層と重ならず、かつ前記半導体スイッチング素子のエミッタ端子と重なる位置に配置されている
ことを特徴とする請求項1記載の半導体装置。 - 前記第1絶縁基板は、前記半導体スイッチング素子を実装していない表面に放熱層を有しており、
前記第2絶縁基板は、前記配線層と前記金属層を有していない他方の表面に放熱層を有している
ことを特徴とする請求項1記載の半導体装置。 - 前記半導体スイッチング素子は、IGBTまたはMOSFETであり、
前記第1絶縁基板は、前記半導体スイッチング素子を実装した表面上に金属層を有し、 前記第1絶縁基板の金属層は、前記半導体スイッチング素子のコレクタ端子と電気的に接続されている
ことを特徴とする請求項1記載の半導体装置。 - 前記第1絶縁基板は、複数の前記半導体スイッチング素子を実装しており、
前記配線層は、矩形の平板形状を有しており、
前記配線層は、前記第1絶縁基板と前記第2絶縁基板を対向面上に投影したとき、各前記半導体スイッチング素子のゲート端子と重なる位置に形成されている
ことを特徴とする請求項1記載の半導体装置。 - 前記第1絶縁基板は、複数の前記半導体スイッチング素子を実装しており、
前記配線層は、各前記半導体スイッチング素子のゲート端子に向かって分岐する形状を有している
ことを特徴とする請求項1記載の半導体装置。 - 請求項1記載の半導体装置を製造する方法であって、
前記半導体スイッチング素子は、IGBTまたはMOSFETであり、
前記方法は、
前記半導体スイッチング素子のゲート端子とエミッタ端子に前記第1接合材を塗布するステップ、
前記第1接合材を用いて、前記半導体スイッチング素子と前記第2絶縁基板を同時に接合するステップ、
前記半導体スイッチング素子と前記第1絶縁基板を接合するステップ、
を有することを特徴とする製造方法。 - 前記方法はさらに、セラミックス材料を1000℃以下で焼結することにより前記セラミックス層を形成するステップを有する
ことを特徴とする請求項12記載の製造方法。
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