JP7305587B2 - 半導体装置および検査装置 - Google Patents
半導体装置および検査装置 Download PDFInfo
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- JP7305587B2 JP7305587B2 JP2020046497A JP2020046497A JP7305587B2 JP 7305587 B2 JP7305587 B2 JP 7305587B2 JP 2020046497 A JP2020046497 A JP 2020046497A JP 2020046497 A JP2020046497 A JP 2020046497A JP 7305587 B2 JP7305587 B2 JP 7305587B2
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Description
図1および図2は、本実施形態の半導体装置10Aの一例を示す模式図である。なお、本実施形態および後述する実施形態において、半導体装置10Aおよび後述する実施形態の半導体装置を総称して説明する場合には、単に、半導体装置10と称して説明する場合がある。
上記実施形態では、図3Aに示すように、半導体13の端面の一部に上記表面電極(半導体電極)である第1電極12を有する構成を一例として説明した。また、上記実施形態では、半導体装置10の第2電極14は、基板電極である場合を一例として説明した。しかし、半導体装置10は、第1電極12および第2電極14の双方を、基板電極として構成してもよい。
上記実施形態では、配線部材18と電極16との接合面24が、2つである場合を一例として説明した。しかし、配線部材18と電極16との接合面24は、複数であってもよい。
本実施形態では、エレクトロマイグレーション抑制領域22が電極16側に設けられた形態を説明する。エレクトロマイグレーション抑制領域22は、第1の実施形態と同様に、上記添加物を含有した添加物含有領域である。
図8は、本実施形態の半導体装置10Cの断面図であり、図3Bと同様の位置・方向の断面を表している。本実施形態では、配線部材18の接合面24の形状を特有の形状とし、該特有の形状の領域を、エレクトロマイグレーション抑制領域23とする形態を説明する。なお、第1の実施形態と同様の構成の部分には、同じ符号を付与して詳細な説明を省略する。
図9は、本実施形態の半導体装置10Dを、+z軸方向に離れた視点から、-z軸方向に見た図である。本実施形態では、配線部材18の電流方向I両端部のサイズを特有のサイズとすることで、エレクトロマイグレーション抑制領域25とする形態を説明する。なお、第1の実施形態と同様の構成の部分には、同じ符号を付与して詳細な説明を省略する。
図10は、本実施形態の半導体装置10Eの断面図であり、図3Bと同様の位置・方向の断面を表している。本実施形態では、電極16における、接合面24の周縁Mを含む領域の厚みを調整することで、エレクトロマイグレーション抑制領域27とする形態を説明する。なお、第1の実施形態と同様の構成の部分には、同じ符号を付与して詳細な説明を省略する。
上記実施形態では、導電性連結部材21が、配線部材18である形態を一例として説明した。本実施形態では、導電性連結部材21が、接合材である形態を説明する。
上記第6の実施形態では、接合面34の周縁Mの少なくとも一部に、エレクトロマイグレーション抑制領域29が設けられた形態を一例として説明した。
本実施形態では、上記実施形態で説明した半導体装置10(半導体装置10A~半導体装置10F’)の導電性連結部材21の劣化を検査する検査装置について説明する。
なお、上記実施形態で説明した、半導体装置10(半導体装置10A~半導体装置10F’)の適用対象は限定されない。例えば、半導体装置10は、MOSFET、GBTなどの各種の半導体デバイスから構成されるパワーモジュールに適用される。また、半導体装置10の適用されたパワーモジュールを、産業機器、鉄道、自動車などのパワーエレクトロニクス分野における基幹部品として好適に適用することができる。これらのモジュールでは、小型化・高出力化に伴い、電流密度の増加および動作温度の上昇が発生する場合がある。しかし、これらのモジュールに上記実施形態の半導体装置10を適用することで、電流密度の増加および動作温度の上昇などに伴って発生する、エレクトロマイグレーションの発生を抑制することができる。従って、上記実施形態の半導体装置10を適用することで、これらのモジュールの信頼性向上を図ることができる。
10,10A,10A’,10B、10C,10D,10E、10F、10F’ 半導体装置
12 第1電極
12A、12A’ 接合面
14 第2電極
14B、14B’ 接合面
16 電極
18 配線部材
18A 接合面
18B 接合面
19 接合材
21 導電性連結部材
22,23,25,27,29 エレクトロマイグレーション抑制領域
24,34,35 接合面
50A 検出部
50B 導出部
M 周縁
Claims (15)
- 一対の電極と、
一対の前記電極に電気的に接合された導電性連結部材と、
を備え、
一対の前記電極の少なくも一方と前記導電性連結部材との接合面の周縁の少なくとも一部が、エレクトロマイグレーション抑制領域を有し、
前記エレクトロマイグレーション抑制領域は、
前記接合面の母材のエレクトロマイグレーションの拡散を抑制、または、電気伝導率を下げる、前記母材とは異なる添加物を含有した添加物含有領域である、
半導体装置。 - 前記エレクトロマイグレーション抑制領域は、
前記接合面の前記周縁の領域である、
請求項1に記載の半導体装置。 - 前記エレクトロマイグレーション抑制領域は、
前記接合面の前記周縁における、前記導電性連結部材を流れる電流の向きである電流方向の上流側端部から前記電流方向の下流側に向かって所定距離の範囲の電流方向上流側端部領域である、
請求項1または請求項2に記載の半導体装置。 - 前記エレクトロマイグレーション抑制領域は、
一対の前記電極および前記導電性連結部材の少なくとも一方における、前記接合面の前記周縁の少なくとも一部の領域である、
請求項1~請求項3の何れか1項に記載の半導体装置。 - 前記エレクトロマイグレーション抑制領域に含まれる前記添加物の含有量が、0.1質量%以上20.0質量%以下である、
請求項1に記載の半導体装置。 - 前記添加物は、Al,Cu,Si,Ni,Cr,Mg,Au,Ag,Ta,Fe,MoW,Ti,Be,Nd,Fr,Nb,およびCoからなる群より選択される少なくとも1種である、
請求項5に記載の半導体装置。 - 前記母材は、Alであり、
前記添加物は、
Si,Cu,Nd,Mg,Fr,Ti,Mo,Ta,Nb,W,Ni,およびCoからなる群より選択される少なくとも1種、および、該群より選択される少なくとも1種とAlとの合金、の少なくとも一方である、
請求項1~請求項6の何れか1項に記載の半導体装置。 - 前記母材は、Cuであり、
前記添加物は、
Si,Al,Nd,Mg,Fr,Ti,Mo,Ta,Nb,W,Ni,およびCoからなる群より選択される少なくとも1種、および、該群より選択される少なくとも1種とAlとの合金、の少なくとも一方である、
請求項1~請求項6の何れか1項に記載の半導体装置。 - 前記母材は、Snを主に含み、
前記添加物は、
Si,Al,Cu,Nd,Mg,Fr,Ti,Mo,Ta,Nb,W,Ni,およびCoからなる群より選択される少なくとも1種、および、該群より選択される少なくとも1種とAlとの合金、の少なくとも一方である、
請求項1~請求項6の何れか1項に記載の半導体装置。 - 前記添加物は、接合前に前記母材に予め添加される、請求項1~請求項6の何れか1項に記載の半導体装置。
- 前記導電性連結部材は、配線部材または接合材である、
請求項1~請求項10の何れか1項に記載の半導体装置。 - 前記導電性連結部材は、一対の前記電極を電気的に接合する配線部材であり、
前記エレクトロマイグレーション抑制領域は、
前記配線部材における、前記接合面の前記周縁の少なくとも一部の領域であり、該領域の断面形状がフィレット形状の領域である、
請求項1~請求項11の何れか1項に記載の半導体装置。 - 前記導電性連結部材は、前記導電性連結部材を流れる電流の向きである電流方向に沿って延伸され、前記電流方向に沿って配列された一対の前記電極を、前記電流方向の両端部である一対の前記電極の各々との前記接合面を介して電気的に接合する配線部材であり、
前記エレクトロマイグレーション抑制領域は、
前記配線部材における、前記接合面の前記周縁を含む領域であり、該配線部材における前記電流方向の中央部である本体部の断面積より大きい領域である、
請求項1~請求項12の何れか1項に記載の半導体装置。 - 前記導電性連結部材は、
前記導電性連結部材を流れる電流の向きである電流方向に沿って延伸され、前記電流方向に沿って配列された一対の前記電極を、前記電流方向の両端部である一対の前記電極の各々との前記接合面を介して電気的に接合し、
前記エレクトロマイグレーション抑制領域は、一対の前記電極の少なくとも一方における、前記接合面の前記周縁を含む領域であり、前記接合面から前記電流方向に沿って前記電流方向の上流側および下流側に向かって離れた位置から前記接合面に近づくほど厚みの大きい領域である、
請求項1~請求項13の何れか1項に記載の半導体装置。 - 前記エレクトロマイグレーション抑制領域を有さない以外は請求項1~請求項14の何れか1項に記載の半導体装置と同じ構成であり、一対の電極と、前記一対の電極に電気的に接合された導電性連結部材と、を備えた比較半導体装置の前記導電性連結部材に接続され、前記比較半導体装置の前記導電性連結部材の物性を検出する検出部と、
前記検出部の検出結果と、前記比較半導体装置の前記導電性連結部材の物性と前記半導体装置の前記導電性連結部材の劣化値との相関を示す相関情報と、を用いて、前記半導体装置の前記導電性連結部材の劣化値を導出する導出部と、
を備える検査装置。
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