JP2010226073A - フォトダイオード及びフォトダイオードアレイ - Google Patents
フォトダイオード及びフォトダイオードアレイ Download PDFInfo
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- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
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Abstract
【解決手段】フォトダイオードアレイPDA1は、複数の光検出チャンネルCHがn型半導体層32を有する基板Sを備える。フォトダイオードアレイPDA1は、n型半導体層32上に形成されたp−型半導体層33と、光検出チャンネルCH毎に設けられると共に信号導線23に一端部が接続される抵抗24と、複数の光検出チャンネルCHの間に形成されるn型の分離部40とを備える。p−型半導体層33は、n型半導体層32との界面でpn接合を構成し、被検出光の入射によって生じたキャリアをアバランシェ増倍させる増倍領域AMを光検出チャンネルに対応して複数有する。n型半導体層32の表面には不規則な凹凸10が形成されており、当該表面は光学的に露出している。
【選択図】図26
Description
図1〜図10を参照して、第1実施形態に係るフォトダイオードの製造方法について説明する。図1〜図10は、第1実施形態に係るフォトダイオードの製造方法を説明するための図である。
図14〜図16を参照して、第2実施形態に係るフォトダイオードの製造方法について説明する。図14〜図16は、第2実施形態に係るフォトダイオードの製造方法を説明するための図である。
図17〜図21を参照して、第3実施形態に係るフォトダイオードの製造方法について説明する。図17〜図21は、第3実施形態に係るフォトダイオードの製造方法を説明するための図である。
図22〜図24を参照して、第4実施形態に係るフォトダイオードの製造方法について説明する。図22〜図24は、第4実施形態に係るフォトダイオードの製造方法を説明するための図である。
図25及び図26を参照して、第5実施形態に係るフォトダイオードアレイPDA1の構成について説明する。図25は、第5実施形態に係るフォトダイオードアレイPDA1を概略的に示す平面図である。図26は、図25に示したフォトダイオードアレイPDA1のXXVI−XXVI線に沿った断面構成を示す図である。
図30を参照して、第6実施形態に係るフォトダイオードアレイPDA2の構成について説明する。図30は、第6実施形態に係るフォトダイオードアレイPDA2の断面構成を概略的に示す図である。第6実施形態に係るフォトダイオードアレイPDA2は、分離部40が遮光部を有している点で第5実施形態に係るフォトダイオードアレイPDA1と異なる。
図31を参照して、第7実施形態に係るフォトダイオードアレイPDA3の構成について説明する。図31は、第7実施形態に係るフォトダイオードアレイPDA3の断面構成を概略的に説明するための図である。第7実施形態に係るフォトダイオードアレイPDA3は、信号導線23が窒化シリコン膜上に形成されている点で第5実施形態に係るフォトダイオードアレイPDA1と異なる。
図32を参照して、第8実施形態に係るフォトダイオードアレイPDA4の構成について説明する。図32は、第8実施形態に係るフォトダイオードアレイPDA4の断面構成を概略的に示す図である。第8実施形態に係るフォトダイオードアレイPDA4は、分離部40を備えていない点で第5実施形態に係るフォトダイオードアレイPDA1と異なる。
Claims (8)
- 被検出光を入射させる複数の光検出チャンネルが第1導電型の半導体層を有するシリコン基板に形成されてなるフォトダイオードアレイであって、
第1導電型の前記半導体層上に形成され、当該半導体層との界面でpn接合を構成するとともに、前記被検出光の入射によって生じたキャリアをアバランシェ増倍させる複数の増倍領域を当該各増倍領域と前記各光検出チャンネルとが互いに対応するように有する第2導電型のエピタキシャル半導体層と、
2つの端部を有し、前記光検出チャンネルごとに設けられ、一方の前記端部を介して前記エピタキシャル半導体層と電気的に接続されると共に他方の前記端部を介して信号導線に接続される複数の抵抗と、を備え、
第1導電型の前記半導体層における少なくとも前記各光検出チャンネルに対応する表面に不規則な凹凸が形成されており、
第1導電型の前記半導体層における少なくとも前記各光検出チャンネルに対応する前記表面は、光学的に露出していることを特徴とするフォトダイオードアレイ。 - 被検出光を入射させる複数の光検出チャンネルが第1導電型の半導体層を有するシリコン基板に形成されてなるフォトダイオードアレイであって、
第1導電型の前記半導体層上に形成され、前記被検出光の入射によって生じたキャリアをアバランシェ増倍させる複数の増倍領域を当該各増倍領域と前記各光検出チャンネルとが互いに対応するように有する第1導電型のエピタキシャル半導体層と、
前記第1導電型のエピタキシャル半導体層中に形成され、当該エピタキシャル半導体層との界面でpn接合を構成する第2導電型の半導体領域と、
2つの端部を有し、前記光検出チャンネルごとに設けられ、一方の前記端部を介して前記エピタキシャル半導体層中の前記第2導電型の半導体領域と電気的に接続されると共に他方の前記端部を介して信号導線に接続される複数の抵抗と、を備え、
第1導電型の前記半導体層における少なくとも前記各光検出チャンネルに対応する表面に不規則な凹凸が形成されており、
第1導電型の前記半導体層における少なくとも前記各光検出チャンネルに対応する前記表面は、光学的に露出していることを特徴とするフォトダイオードアレイ。 - 第1導電型の前記半導体層における前記複数の光検出チャンネルの間に対応する表面は、不規則な凹凸が更に形成されていると共に、光学的に露出していることを特徴とする請求項1又は2フォトダイオードアレイ。
- 前記シリコン基板は、複数の光検出チャンネルが形成されている部分が該部分の周辺部分を残して薄化されていることを特徴とする請求項1〜3のいずれか一項に記載のフォトダイオードアレイ。
- 第1導電型の前記半導体層の厚みが、不規則な前記凹凸の高低差よりも大きいことを特徴とする請求項1〜4のいずれか一項に記載のフォトダイオードアレイ。
- 第1導電型の半導体からなり、互いに対向する第1主面及び第2主面を有すると共に前記第1主面側に第2導電型の半導体領域が形成されたシリコン基板を備え、
前記シリコン基板には、前記第2主面側に前記シリコン基板よりも高い不純物濃度を有する第1導電型のアキュムレーション層が形成されていると共に、前記第2主面における少なくとも第2導電型の前記半導体領域に対向する領域に不規則な凹凸が形成されており、
前記シリコン基板の前記第2主面における第2導電型の前記半導体領域に対向する前記領域は、光学的に露出していることを特徴とするフォトダイオード。 - 前記シリコン基板は、第2導電型の前記半導体領域に対応する部分が該部分の周辺部分を残して前記第2主面側より薄化されていることを特徴とする請求項6に記載のフォトダイオード。
- 第1導電型の前記アキュムレーション層の厚みが、不規則な前記凹凸の高低差よりも大きいことを特徴とする請求項6又は7に記載のフォトダイオード。
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EP3467875A1 (en) | 2019-04-10 |
KR101708069B1 (ko) | 2017-02-17 |
CN102334199B (zh) | 2016-04-06 |
EP3467875B1 (en) | 2023-07-12 |
US20140110808A1 (en) | 2014-04-24 |
JP5185207B2 (ja) | 2013-04-17 |
KR20110136789A (ko) | 2011-12-21 |
EP2403013B1 (en) | 2018-12-19 |
EP2403013A4 (en) | 2013-04-03 |
EP2403013A1 (en) | 2012-01-04 |
US20110291218A1 (en) | 2011-12-01 |
US8994135B2 (en) | 2015-03-31 |
TWI476906B (zh) | 2015-03-11 |
WO2010098225A1 (ja) | 2010-09-02 |
TW201101469A (en) | 2011-01-01 |
CN102334199A (zh) | 2012-01-25 |
US8742528B2 (en) | 2014-06-03 |
CN104201219A (zh) | 2014-12-10 |
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