JP7304827B2 - 半導体装置およびクラック検出方法 - Google Patents
半導体装置およびクラック検出方法 Download PDFInfo
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- JP7304827B2 JP7304827B2 JP2020006563A JP2020006563A JP7304827B2 JP 7304827 B2 JP7304827 B2 JP 7304827B2 JP 2020006563 A JP2020006563 A JP 2020006563A JP 2020006563 A JP2020006563 A JP 2020006563A JP 7304827 B2 JP7304827 B2 JP 7304827B2
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Description
図1は、実施の形態1に係る半導体装置100の構成を示す断面図である。本実施の形態では、半導体装置100が備える半導体素子は、絶縁ゲート型、より具体的にはトレンチゲート型のIGBT(Insulated Gate Bipolar Transistor)であるものとする。ただし、半導体素子は、例えばMOSFET(Metal-Oxide-Semiconductor Field Effect Transistor)やダイオードなど、IGBT以外の素子であってもよい。また、IGBTやMOSFETはプレーナゲート型でもよい。また、以下では第1導電型をN型、第2導電型をP型として説明するが、それとは逆に、第1導電型をP型、第2導電型をN型としてもよい。
図4は実施の形態2に係る半導体装置100の構成を示す断面図である。図4には、半導体装置100の断面の右側半分を拡大して示している。また、図4では、図1に示したものと同様の要素にそれと同一の符号を付してあるため、ここではそれらの説明は省略する。
図5は、実施の形態3に係る半導体装置100の構成を示す断面図である。図5においても、半導体装置100の断面の右側半分を拡大して示している。また、図5では、図1に示したものと同様の要素にそれと同一の符号を付してあるため、ここではそれらの説明は省略する。
図7は、実施の形態4に係る半導体装置100の構成を示す断面図である。図7においても、半導体装置100の断面の右側半分を拡大して示している。また、図7では、図1に示したものと同様の要素にそれと同一の符号を付してあるため、ここではそれらの説明は省略する。
図8は、実施の形態5に係る半導体装置100の構成を示す断面図である。図8においても、半導体装置100の断面の右側半分を拡大して示している。また、図8では、図1に示したものと同様の要素にそれと同一の符号を付してあるため、ここではそれらの説明は省略する。
Claims (5)
- 半導体素子が形成された活性領域および前記活性領域の外側のエッジターミネーション領域を有する半導体層と、
前記エッジターミネーション領域に形成されたクラック検出構造体と、
を備え、
前記クラック検出構造体は、
前記半導体層に形成され前記エッジターミネーション領域の周方向に伸びるトレンチと、
前記トレンチの内壁に形成された内壁絶縁膜と、
前記内壁絶縁膜上に形成され前記トレンチに埋め込まれた埋め込み電極と、
前記半導体層上に形成され前記埋め込み電極と接続したモニタ電極と、
を備え、
前記クラック検出構造体の前記トレンチは、前記半導体層における第1導電型のドリフト層内に形成されており、
前記ドリフト層における前記トレンチの周囲に、少なくとも前記トレンチの底部の周囲を覆い、前記埋め込み電極および前記モニタ電極から絶縁された第2導電型の領域が形成されている、
半導体装置。 - 前記半導体素子は、ゲート絶縁膜およびゲート電極を有する絶縁ゲート型の半導体素子であり、
前記クラック検出構造体の前記内壁絶縁膜の厚さは、前記半導体素子の前記ゲート絶縁膜の厚さよりも厚い、
請求項1に記載の半導体装置。 - 前記半導体素子は、前記半導体層に形成されたトレンチに埋め込まれたゲート絶縁膜およびゲート電極を有するトレンチゲート型の半導体素子であり、
前記クラック検出構造体の前記トレンチの深さは、前記半導体素子の前記トレンチの深さよりも深い、
請求項1または請求項2に記載の半導体装置。 - 前記半導体素子は、前記半導体層に形成されたトレンチに埋め込まれたゲート絶縁膜およびゲート電極を有するトレンチゲート型の半導体素子であり、
前記クラック検出構造体の前記トレンチの幅は、前記半導体素子の前記トレンチの幅よりも広い、
請求項1から請求項3のいずれか一項に記載の半導体装置。 - 請求項1から請求項4のいずれか一項に記載の半導体装置のクラック検出方法であって、
前記クラック検出構造体の前記モニタ電極と、前記半導体装置が備える他の電極との間のリーク電流または電位差を測定し、
測定された前記リーク電流または前記電位差の値に基づいて前記半導体装置のクラックの有無を判定する、
クラック検出方法。
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