JP2021034559A - 光電変換装置、光電変換システム、および移動体 - Google Patents
光電変換装置、光電変換システム、および移動体 Download PDFInfo
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Abstract
Description
図3〜図7を用いて第1の実施形態における光電変換装置の構成について説明する。
図9は、第2の実施形態の断面図である。本実施形態は、以下で説明するように、半導体基板300の内部における各半導体領域の構成が異なる。第1の実施形態と同様の構成要素には同一の符号を付し、説明を省略或いは簡潔にする。
図12は、本実施形態に係る光電変換システム1200の構成を示すブロック図である。本実施形態の光電変換システム1200は、光電変換装置1204を含む。ここで、光電変換装置1204は、上述の実施形態で述べた光電変換装置のいずれかを適用することができる。光電変換システム1200は例えば、撮像システムとして用いることができる。撮像システムの具体例としては、デジタルスチルカメラ、デジタルカムコーダー、監視カメラ等が挙げられる。図12では、光電変換システム1200としてデジタルスチルカメラの例を示している。
本実施形態の光電変換システムおよび移動体について、図13および図14を用いて説明する。図13は、本実施形態による光電変換システムおよび移動体の構成例を示す概略図である。図14は、本実施形態による光電変換システムの動作を示すフロー図である。本実施形態では、光電変換システムとして、車載カメラの一例を示す。
302 第2半導体領域
303 第3半導体領域
307 トレンチ構造
402 コンタクトプラグ
Claims (13)
- 第1の面を有する半導体基板と、
前記半導体基板の内部に形成され、第1のアバランシェダイオードおよび第2のアバランシェダイオードを含む複数のアバランシェダイオードと、
平面視で、前記第1のアバランシェダイオードと前記第1のアバランシェダイオードに隣り合う前記第2のアバランシェダイオードとの間に形成されたトレンチ構造と、を備え、
前記複数のアバランシェダイオードの各々は、第1の深さに形成された第1導電型の第1半導体領域と、前記第1の面からの深さが前記第1の深さよりも深い第2の深さに形成された第2導電型の第2半導体領域と、を含み、
前記第1の面に前記第1のアバランシェダイオードの前記第2半導体領域に電位を供給するコンタクトプラグが形成され、
平面視で前記トレンチ構造と重なる位置に前記コンタクトプラグが設けられていることを特徴とする光電変換装置。 - 前記コンタクトプラグは、さらに前記第2のアバランシェダイオードの前記第2半導体領域に電位を供給することを特徴とする請求項1に記載の光電変換装置。
- 前記半導体基板は、前記第1の面に向かい合う第2の面を有し、
前記トレンチ構造は、前記第2の面から前記アバランシェダイオードのアバランシェ増倍領域と同じ深さまで形成されることを特徴とする請求項1または2に記載の光電変換装置。 - 前記半導体基板は、前記第1の面に向かい合う第2の面を有し、
前記複数のアバランシェダイオードの各々は、前記第2の深さに形成され、前記第1半導体領域よりも不純物濃度の低い前記第1導電型の半導体領域を含み、
前記トレンチ構造は、前記第2の面から前記第1半導体領域と前記半導体領域との界面と同じ深さまで形成されることを特徴とする請求項1または2に記載の光電変換装置。 - 前記半導体基板は、前記第1の面に向かい合う第2の面を有し、
前記トレンチ構造は、前記第2の面から前記第1半導体領域と前記第2半導体領域との界面と同じ深さまで形成されていることを特徴とする請求項1または2に記載の光電変換装置。 - 前記コンタクトプラグと前記トレンチ構造との間には、前記第2導電型の第3半導体領域が形成されていることを特徴とする請求項1乃至5のいずれか1項に記載の光電変換装置。
- 平面視で、前記トレンチ構造の幅は、前記第3半導体領域の幅よりも小さいことを特徴とする請求項6に記載の光電変換装置。
- 前記トレンチ構造は、金属および絶縁部材の少なくとも一方を含むことを特徴とする請求項1乃至7のいずれか1項に記載の光電変換装置。
- 平面視で前記第1半導体領域を取り囲んで前記トレンチ構造が形成されていることを特徴とする請求項1乃至8のいずれか1項に記載の光電変換装置。
- 前記トレンチ構造は、平面視で第1の方向に伸びる第1部分と、平面視で前記第1の方向に交差する第2の方向に伸びる第2部分と、を含み、
前記コンタクトプラグは、前記トレンチ構造の前記第1部分と前記第2部分との交点に配置されていることを特徴とする請求項1乃至9のいずれか1項に記載の光電変換装置。 - 前記複数のアバランシェダイオードは第3のアバランシェダイオードと第4のアバランシェダイオードとを含み、
前記複数のアバランシェダイオードが2次元状に配され、
前記コンタクトプラグは前記第3のアバランシェダイオードの前記第2半導体領域および前記第4のアバランシェダイオードの前記第2半導体領域に電位を供給することを特徴とする請求項1乃至10のいずれか1項に記載の光電変換装置。 - 請求項1乃至11のいずれか1項に記載の光電変換装置と、
前記光電変換装置が出力する信号を処理する信号処理部と、を有することを特徴とする光電変換システム。 - 請求項1乃至11のいずれか1項に記載の光電変換装置と、
前記光電変換装置からの信号に基づく測距情報から、対象物までの距離情報を取得する距離情報取得手段と、を有する移動体であって、
前記距離情報に基づいて前記移動体を制御する制御手段をさらに有することを特徴とする移動体。
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