JP7270616B2 - 固体撮像素子および固体撮像装置 - Google Patents
固体撮像素子および固体撮像装置 Download PDFInfo
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- JP7270616B2 JP7270616B2 JP2020519512A JP2020519512A JP7270616B2 JP 7270616 B2 JP7270616 B2 JP 7270616B2 JP 2020519512 A JP2020519512 A JP 2020519512A JP 2020519512 A JP2020519512 A JP 2020519512A JP 7270616 B2 JP7270616 B2 JP 7270616B2
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Description
1.実施の形態(2×2の画素領域毎にコンタクト電極が配置された固体撮像素子)
2.変形例1(2×1の画素領域毎にコンタクト電極を有する例)
3.変形例2(不純物拡散領域が複数の異なる濃度領域を有する例)
4.変形例3(トランジスタのソース・ドレイン領域が共有される例)
5.適用例(撮像装置)
6.応用例
(撮像素子1の構成)
図1は、本開示の一実施の形態に係る固体撮像素子(撮像素子1)の機能構成の一例を模式的に表したものである。撮像素子1は、例えば可視領域の波長の光に対して感度を有している。この撮像素子1には、例えば四角形状の受光領域10Pと、受光領域10Pの外側の周辺領域10Bとが設けられている。周辺領域10Bには、受光領域10Pを駆動するための周辺回路が設けられている。
このような撮像素子1では、例えば次のようにして信号電荷が取得される。光が、マイクロレンズ15およびカラーフィルタ14等を通過して半導体基板11の第2面S2に入射すると、光は各画素領域PのPD12で検出(吸収)され、赤,緑または青の色光が光電変換される。PD12で発生した電子-正孔対のうち、一方(例えば電子)はFD(n型不純物拡散領域)へ移動して蓄積され、他方(例えば正孔)はp型不純物の拡散領域11xa,11xb,11xc,11xdを介して接地電位GNDに排出される。
本実施の形態の撮像素子1では、2行×2列の隣り合う4つの画素領域Pに設けられたFDA,FDB,FDC,FDDに接してコンタクト電極26が設けられている。これにより、FDA,FDB,FDCおよびFDDが同電位となり、隣り合う4つの画素領域PでFDが共有される。これにより、各画素領域Pを縮小しやすくなる。したがって、画素領域Pの微細化が可能となる。
図11A,図11Bは、上記実施の形態の変形例1に係る撮像素子(撮像素子1A)の要部の構成を模式的に表したものである。図11Aは受光領域10Pの平面構成を表し、図11Bは図11Aに示したB-B’線に沿った断面構成を表している。この撮像素子1Aでは、2行×1列の2つの画素領域Pの間でFDが共有されている。この点を除き、撮像素子1Aは、上記実施の形態の撮像素子1と同様の構成を有し、その作用および効果も同様である。
図12は、上記実施の形態の変形例2に係る撮像素子(撮像素子1B)の要部の断面構成を模式的に表したものである。この撮像素子1Bは、コンタクト電極26が接するFDAおよびFDDが各々、不純物濃度の異なる領域(FDA1,FDA2,FDD1,FDD2)を有している。この点を除き、撮像素子1Bは、上記実施の形態の撮像素子1と同様の構成を有し、その作用および効果も同様である。
図13A,図13Bは、上記実施の形態の変形例3に係る撮像素子(撮像素子1C)の要部の構成を模式的に表したものである。図13Aは受光領域10Pの平面構成を表し、図13Bは図13Aに示したB-B’線に沿った断面構成を表している。この撮像素子1Cでは、2行×1列の2つの画素領域Pの間でリセットトランジスタTr2の定電圧源VDD端子(ソース・ドレイン領域32F)と、増幅トランジスタTr3の定電圧源VDD端子(ソース・ドレイン領域33F)とが共有されている。この点を除き、撮像素子1Cは、上記実施の形態の撮像素子1と同様の構成を有し、その作用および効果も同様である。
上述の撮像素子1,1A,1B,1C(以下、略して撮像素子1とする)は、例えば可視領域の波長の光を撮像可能なカメラなど、様々なタイプの撮像装置(電子機器)に適用することができる。図15に、撮像装置の一例として、電子機器3(カメラ)の概略構成を示す。この電子機器3は、例えば静止画または動画を撮影可能なカメラであり、撮像素子1と、光学系(光学レンズ)310と、シャッタ装置311と、撮像素子1およびシャッタ装置311を駆動する駆動部313と、信号処理部312とを有する。
更に、本開示に係る技術(本技術)は、様々な製品へ応用することができる。例えば、本開示に係る技術は、内視鏡手術システムに適用されてもよい。
本開示に係る技術(本技術)は、様々な製品へ応用することができる。例えば、本開示に係る技術は、内視鏡手術システムに適用されてもよい。
本開示に係る技術は、様々な製品へ応用することができる。例えば、本開示に係る技術は、自動車、電気自動車、ハイブリッド電気自動車、自動二輪車、自転車、パーソナルモビリティ、飛行機、ドローン、船舶、ロボット、建設機械、農業機械(トラクター)などのいずれかの種類の移動体に搭載される装置として実現されてもよい。
(1)
対向する第1面および第2面を有するとともに、画素領域毎に設けられた光電変換部を有する半導体基板と、
前記画素領域毎に、前記半導体基板の前記第1面近傍に設けられた不純物拡散領域と、
前記第1面から前記半導体基板に埋設され、隣り合う前記画素領域各々に設けられた前記不純物拡散領域に跨って接するコンタクト電極と
を備えた固体撮像素子。
(2)
更に、隣り合う前記画素領域の間に設けられ、前記半導体基板の前記第1面から前記第2面までを貫通する画素分離溝を有する
前記(1)に記載の固体撮像素子。
(3)
前記画素分離溝に重なる位置に、前記コンタクト電極が配置されている
前記(2)に記載の固体撮像素子。
(4)
前記コンタクト電極の側面の少なくとも一部と、底面とが前記不純物拡散領域に接している
前記(1)ないし(3)のうちいずれか1つに記載の固体撮像素子。
(5)
前記コンタクト電極は、前記半導体基板に埋設された埋設部分と、前記半導体基板の外側に設けられた露出部分とを含む
前記(1)ないし(4)のうちいずれか1つに記載の固体撮像素子。
(6)
前記露出部分の幅は、前記埋設部分の幅と同じである
前記(5)に記載の固体撮像素子。
(7)
前記露出部分は、前記埋設部分よりも拡幅して設けられている
前記(5)に記載の固体撮像素子。
(8)
前記コンタクト電極は、2つの画素領域各々に設けられた前記不純物拡散領域に跨って接している
前記(1)ないし(7)のうちいずれか1つに記載の固体撮像素子。
(9)
前記コンタクト電極は、4つの画素領域各々に設けられた前記不純物拡散領域に跨って接している
前記(1)ないし(8)のうちいずれか1つに記載の固体撮像素子。
(10)
前記不純物拡散領域は、前記光電変換部で生成された信号電荷が蓄積される電荷蓄積部を構成する
前記(1)ないし(9)のうちいずれか1つに記載の固体撮像素子。
(11)
更に、隣り合う前記画素領域各々に設けられたトランジスタを有し、
前記不純物拡散領域は、前記トランジスタのソース・ドレイン領域を構成する
前記(1)ないし(9)のうちいずれか1つに記載の固体撮像素子。
(12)
前記コンタクト電極はVDD電位に接続されている
前記(11)に記載の固体撮像素子。
(13)
前記不純物拡散領域は、前記コンタクト電極が接する第1不純物拡散領域と、前記第1不純物拡散領域よりも前記コンタクト電極から離れた位置に配置されるとともに、前記第1不純物拡散領域の不純物濃度よりも低い不純物濃度を有する第2不純物拡散領域とを含む
前記(1)ないし(12)のうちいずれか1つに記載の固体撮像素子。
(14)
前記不純物拡散領域は、n型の不純物拡散領域である
前記(1)ないし(13)のうちいずれか1つに記載の固体撮像素子。
(15)
対向する第1面および第2面を有するとともに、画素領域毎に設けられた光電変換部を有する半導体基板と、
前記画素領域毎に、前記半導体基板の前記第1面近傍に設けられた不純物拡散領域と、
前記第1面から前記半導体基板に埋設され、隣り合う前記画素領域各々に設けられた前記不純物拡散領域に跨って接するコンタクト電極とを含む
固体撮像素子を備えた固体撮像装置。
Claims (15)
- 対向する第1面および第2面を有するとともに、画素領域毎に設けられた光電変換部を有する半導体基板と、
前記画素領域毎に、前記半導体基板の前記第1面近傍に設けられた不純物拡散領域と、
前記第1面から前記半導体基板に埋設され、隣り合う前記画素領域各々に設けられた前記不純物拡散領域に跨って接するコンタクト電極と
を備え、
前記不純物拡散領域は、前記光電変換部で生成された信号電荷が蓄積される電荷蓄積部を構成する
固体撮像素子。 - 対向する第1面および第2面を有するとともに、画素領域毎に設けられた光電変換部を有する半導体基板と、
前記画素領域毎に、前記半導体基板の前記第1面近傍に設けられた不純物拡散領域と、
前記第1面から前記半導体基板に埋設され、隣り合う前記画素領域各々に設けられた前記不純物拡散領域に跨って接するコンタクト電極と、
隣り合う前記画素領域各々に設けられたトランジスタと
を備え、
前記不純物拡散領域は、前記トランジスタのソース・ドレイン領域を構成する
固体撮像素子。 - 更に、隣り合う前記画素領域の間に設けられ、前記半導体基板の前記第1面から前記第2面までを貫通する画素分離溝を有する
請求項1または請求項2に記載の固体撮像素子。 - 前記画素分離溝に重なる位置に、前記コンタクト電極が配置されている
請求項3に記載の固体撮像素子。 - 前記コンタクト電極の側面の少なくとも一部と、底面とが前記不純物拡散領域に接している
請求項1または請求項2に記載の固体撮像素子。 - 前記コンタクト電極は、前記半導体基板に埋設された埋設部分と、前記半導体基板の外側に設けられた露出部分とを含む
請求項1または請求項2に記載の固体撮像素子。 - 前記露出部分の幅は、前記埋設部分の幅と同じである
請求項6に記載の固体撮像素子。 - 前記露出部分は、前記埋設部分よりも拡幅して設けられている
請求項6に記載の固体撮像素子。 - 前記コンタクト電極は、2つの画素領域各々に設けられた前記不純物拡散領域に跨って接している
請求項1または請求項2に記載の固体撮像素子。 - 前記コンタクト電極は、4つの画素領域各々に設けられた前記不純物拡散領域に跨って接している
請求項1または請求項2に記載の固体撮像素子。 - 前記コンタクト電極はVDD電位に接続されている
請求項2に記載の固体撮像素子。 - 前記不純物拡散領域は、前記コンタクト電極が接する第1不純物拡散領域と、前記第1不純物拡散領域よりも前記コンタクト電極から離れた位置に配置されるとともに、前記第1不純物拡散領域の不純物濃度よりも低い不純物濃度を有する第2不純物拡散領域とを含む
請求項1または請求項2に記載の固体撮像素子。 - 前記不純物拡散領域は、n型の不純物拡散領域である
請求項1または請求項2に記載の固体撮像素子。 - 対向する第1面および第2面を有するとともに、画素領域毎に設けられた光電変換部を有する半導体基板と、
前記画素領域毎に、前記半導体基板の前記第1面近傍に設けられた不純物拡散領域と、
前記第1面から前記半導体基板に埋設され、隣り合う前記画素領域各々に設けられた前記不純物拡散領域に跨って接するコンタクト電極とを含む
固体撮像素子を備え、
前記不純物拡散領域は、前記光電変換部で生成された信号電荷が蓄積される電荷蓄積部を構成する
固体撮像装置。 - 対向する第1面および第2面を有するとともに、画素領域毎に設けられた光電変換部を有する半導体基板と、
前記画素領域毎に、前記半導体基板の前記第1面近傍に設けられた不純物拡散領域と、
前記第1面から前記半導体基板に埋設され、隣り合う前記画素領域各々に設けられた前記不純物拡散領域に跨って接するコンタクト電極と、
隣り合う前記画素領域各々に設けられたトランジスタとを含む
固体撮像素子を備え、
前記不純物拡散領域は、前記トランジスタのソース・ドレイン領域を構成する
固体撮像素子。
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DE112019002463T5 (de) | 2021-04-22 |
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US20210242254A1 (en) | 2021-08-05 |
KR102699692B1 (ko) | 2024-08-29 |
EP3796387A4 (en) | 2021-05-19 |
KR20210009304A (ko) | 2021-01-26 |
TW201947751A (zh) | 2019-12-16 |
EP3796387A1 (en) | 2021-03-24 |
JPWO2019220810A1 (ja) | 2021-06-24 |
WO2019220810A1 (ja) | 2019-11-21 |
CN111819694B (zh) | 2024-05-21 |
TW202414810A (zh) | 2024-04-01 |
CN111819694A (zh) | 2020-10-23 |
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