JP2020088291A - 光電変換装置、光電変換システム、移動体 - Google Patents
光電変換装置、光電変換システム、移動体 Download PDFInfo
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Abstract
Description
図1は、光電変換装置の一例である、本実施形態による固体撮像装置の概略構成を示すブロック図である。図2は、本実施形態による固体撮像装置の画素の等価回路図である。図3は、本実施形態による固体撮像装置の画素の平面レイアウトを示す図である。図4は、本実施形態による固体撮像装置の画素の概略断面図である。図5は、本実施形態の比較例による固体撮像装置の画素の平面図である。
本実施形態について、第1実施形態と異なる点を中心に説明する。本実施形態は、光電変換部PDにおいて信号電荷を蓄積する領域であるN型半導体領域の下部に、P型半導体領域48よりも不純物濃度が高いP型半導体領域PDSを設ける。これにより、N型半導体領域44と、その下部に設けられるP型半導体領域との間に生じる空乏層の容量を第1実施形態よりも大きくする。これにより、光電変換部PDの飽和電荷量を、第1実施形態よりも多くしたものである。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。本実施形態は、裏面電極を用いずに、P型半導体領域48に電位勾配を形成する光電変換装置である。
本実施形態の光電変換装置について、第1実施形態と異なる点を中心に説明する。
本実施形態による光電変換システムについて、図19を用いて説明する。上述した各実施形態の光電変換装置と同様の構成要素には同一の符号を付し説明を省略し或いは簡潔にする。図19は、本実施形態による撮像システムの概略構成を示すブロック図である。
本実施形態による光電変換システム及び移動体について、図20を用いて説明する。図20は、本実施形態による撮像システム及び移動体の構成を示す図である。
本発明は、上記実施形態に限らず種々の変形が可能である。
23 浮遊拡散領域
25 増幅ゲート
27 選択ゲート
29 リセットゲート
31 表面電極
35 P型分離領域
41 P型分離領域
42 P型半導体領域
44 N型半導体領域
48 P型半導体領域
52 裏面電極
Claims (20)
- 第1面、第2面を有する半導体基板を備え、
前記第1面からの深さが第1の深さの位置に設けられた第1導電型の第1半導体領域と、
前記第1面からの深さが、前記第1の深さよりも深い第2の深さの位置に設けられ、前記第1半導体領域に接するとともに、前記第2面側から第1電位が与えられる第2導電型の第2半導体領域と、
前記第1の深さから、前記第2の深さよりも浅い第3の深さに渡って延在し、前記第1半導体領域と前記第2半導体領域とに接し、前記第2半導体領域よりも不純物濃度が高く、前記第1導電型の半導体領域が主たるキャリアとする電荷に対するポテンシャルが前記第1電位よりも低い電位である第2電位が与えられる、前記第2導電型の第3半導体領域とを有し、
前記第2半導体領域の不純物濃度が1×1012[atom/cm3]以下であることを特徴とする光電変換装置。 - 第1面、第2面を有する半導体基板を備え、
前記第1面からの深さが第1の深さの位置に設けられた第1導電型の第1半導体領域と、
前記第1面からの深さが、前記第1の深さよりも深い第2の深さの位置に設けられ、前記第1半導体領域に接するとともに、前記第2面側から第1電位が与えられる第2導電型の第2半導体領域と、
前記第1の深さから、前記第2の深さよりも浅い第3の深さに渡って延在し、前記第1半導体領域と前記第2半導体領域とに接し、前記第2半導体領域よりも不純物濃度が高く、前記第1導電型の半導体領域が主たるキャリアとする電荷に対するポテンシャルが前記第1電位よりも低い電位である第2電位が与えられる、前記第2導電型の第3半導体領域とを有し、
前記第2半導体領域の電気抵抗率が3000[Ω・cm]以上であることを特徴とする光電変換装置。 - 前記第1半導体領域よりも前記第1面側に、前記第2導電型の第4半導体領域をさらに有し、
前記第3半導体領域は、前記第4半導体領域に接し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。 - 前記第1半導体領域の底面の下部に、前記第2導電型の第5半導体領域を有し、
前記第5半導体領域は前記第2半導体領域よりも不純物濃度が高いことを特徴とする請求項1〜3のいずれか1項に記載の光電変換装置。 - 前記第5半導体領域と前記第3半導体領域とが接することを特徴とする請求項4に記載の光電変換装置。
- 前記第2面に沿って延在するとともに、前記第1面からの深さが、前記第2の深さよりも深い位置に設けられ、前記第2半導体領域よりも高い不純物濃度を有する前記第2導電型の第6半導体領域と、
前記第1面から、前記第6半導体領域に接するように、深さ方向に延在する、前記第2導電型の第7半導体領域とを有し、
前記第7半導体領域に電位が与えられることによって、前記第6半導体領域を介して、前記第2半導体領域に前記第1電位が与えられることを特徴とする請求項1〜5のいずれか1項に記載の光電変換装置。 - 前記第2半導体領域に前記第1電位を与える電極が、前記第2面に沿って延在して設けられていることを特徴とする請求項1〜6のいずれか1項に記載の光電変換装置。
- 前記電極と、前記第2半導体領域との間に、前記第2半導体領域よりも高い不純物濃度の前記第2導電型の第8半導体領域を有することを特徴とする請求項7に記載の光電変換装置。
- 前記第1面から前記第1半導体領域に光が入射し、
前記電極が、前記第1半導体領域、前記第2半導体領域を透過した光を反射する金属で形成されていることを特徴とする請求項7または8に記載の光電変換装置。 - 前記第2面から前記第1半導体領域に光が入射し、
前記電極が、透明電極であることを特徴とする請求項7に記載の光電変換装置。 - 前記電極と前記第2面との間に、反射防止膜を有することを特徴とする請求項10に記載の光電変換装置。
- 1つのマイクロレンズをさらに有し、
前記第1半導体領域が複数、設けられ、
前記1つのマイクロレンズに対し、複数の前記第1半導体領域が対応して設けられていることを特徴とする請求項1〜11のいずれか1項に記載の光電変換装置。 - 前記複数の第1半導体領域の間に、前記第2導電型の第9半導体領域をさらに有することを特徴とする請求項12に記載の光電変換装置。
- 前記第9半導体領域は、前記第1半導体領域が設けられた深さから、前記第3の深さに渡って設けられていることを特徴とする請求項13に記載の光電変換装置。
- 前記第3半導体領域の内部に絶縁部材が設けられていることを特徴とする請求項1〜14のいずれか1項に記載の光電変換装置。
- 前記第1半導体領域、前記第3半導体領域を各々が有する複数の画素を有し、
前記複数の画素の各々の前記第3半導体領域は互いに接しており、
前記複数の画素の各々の前記第3半導体領域に前記第2電位を与えるためのコンタクトが、前記複数の画素で共有されていることを特徴とする請求項1〜15のいずれか1項に記載の光電変換装置。 - 可視光が入射する第1画素と、可視光よりも長波長の光が入射する第2画素とを有し、
前記第1画素、前記第2画素のそれぞれは、前記第1半導体領域を有し、
前記第1画素の前記第1半導体領域よりも、前記第1面から見て深さが増す順に、前記第2導電型の第10半導体領域、前記第2導電型の第11半導体領域、前記第3半導体領域が設けられ、
前記第11半導体領域の不純物濃度が、前記第10半導体領域と前記第3半導体領域のそれぞれよりも高いことを特徴とする請求項1〜16のいずれか1項に記載の光電変換装置。 - 前記第10半導体領域が、前記第11半導体領域に囲まれていることを特徴とする請求項17に記載の光電変換装置。
- 請求項1〜18のいずれか1項に記載の光電変換装置と、
前記光電変換装置の前記画素から出力され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。 - 移動体であって、
請求項1〜18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視差画像から、対象物までの距離情報を取得する距離情報取得手段と、
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と
を有することを特徴とする移動体。
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