JP7445397B2 - 受光素子および電子機器 - Google Patents
受光素子および電子機器 Download PDFInfo
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Description
本開示は、光を用いて測距を行う技術に関するものである。そこで、本開示の実施形態の理解を容易とするために、図1および図2を参照しながら、実施形態に適用可能な測距方法について説明する。
D=(c/2)×(t1-t0) …(1)
つづいて、実施形態に係る受光チップ3の構成について、図3を参照しながら説明する。図3は、本開示の実施形態に係る受光チップ3の構成例を示すブロック図である。図1に示すように、実施形態に係る受光チップ3は、画素アレイ部11と、バイアス電圧印加部12とを備える。画素アレイ部11は、受光素子の一例である。
つづいて、実施形態に係る画素アレイ部11の構成について、図4~図6を参照しながら説明する。図4は、本開示の実施形態に係る画素アレイ部11の構成例を示す断面図である。
つづいて、実施形態に係る画素アレイ部11の製造工程、特に埋め込み層48の形成工程について、図7~図12を参照しながら説明する。図7~図12は、本開示の実施形態に係る画素アレイ部11の一製造工程を模式的に示す断面図である。
つづいて、実施形態の各種変形例について、図13~図15を参照しながら説明する。図13は、本開示の実施形態の変形例1に係る画素アレイ部11の構成例を示す断面図である。
実施形態に係る受光素子(画素アレイ部11)は、SPAD素子22と、カソード電極61およびアノード電極62と、カソードコンタクト領域44と、アノードコンタクト領域47と、埋め込み層48とを備える。SPAD素子22は、半導体層31に形成され、アレイ状に配置される複数の画素21ごとに設けられる。カソード電極61およびアノード電極62は、半導体層31に隣接する配線層(センサ側配線層32)に少なくとも一部が形成され、SPAD素子22に逆バイアス電圧を印加する。N型のカソードコンタクト領域44は、半導体層31に形成され、カソード電極61に直接接続される。P型のアノードコンタクト領域47は、半導体層31に形成され、アノード電極62に直接接続される。絶縁性の埋め込み層48は、カソードコンタクト領域44およびアノードコンタクト領域47のいずれか一方と、半導体層31の光入射側とは反対側の面(反対面31b)との間に位置する。
図16は、受光チップ3を利用した電子機器である距離画像センサの構成例を示すブロック図である。
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、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、ロボット等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)
半導体層に形成され、アレイ状に配置される複数の画素ごとに設けられるSPAD(Single Photon Avalanche Diode)素子と、
前記半導体層に隣接する配線層に少なくとも一部が形成され、前記SPAD素子に逆バイアス電圧を印加するカソード電極およびアノード電極と、
前記半導体層に形成され、前記カソード電極に直接接続されるN型のカソードコンタクト領域と、
前記半導体層に形成され、前記アノード電極に直接接続されるP型のアノードコンタクト領域と、
前記カソードコンタクト領域および前記アノードコンタクト領域のいずれか一方と、前記半導体層の光入射側とは反対側の面との間に位置する絶縁性の埋め込み層と、
を備える受光素子。
(2)
前記半導体層における光入射側とは反対側の面に形成され、接地電位に接続される表面ピニング層をさらに備える
前記(1)に記載の受光素子。
(3)
前記半導体層において前記カソードコンタクト領域と接するN型拡散層をさらに備え、
前記N型拡散層と前記半導体層の光入射側とは反対側の面との間が前記埋め込み層で覆われる
前記(1)に記載の受光素子。
(4)
半導体層に形成され、アレイ状に配置される複数の画素ごとに設けられるSPAD(Single Photon Avalanche Diode)素子と、
前記半導体層に隣接する配線層に少なくとも一部が形成され、前記SPAD素子に逆バイアス電圧を印加するカソード電極およびアノード電極と、
前記半導体層に形成され、前記カソード電極に直接接続されるN型のカソードコンタクト領域と、
前記半導体層に形成され、前記アノード電極に直接接続されるP型のアノードコンタクト領域と、
前記カソードコンタクト領域および前記アノードコンタクト領域のいずれか一方と、前記半導体層の光入射側とは反対側の面との間に位置する絶縁性の埋め込み層と、
を備える受光素子を備える
電子機器。
(5)
前記受光素子は、前記半導体層における光入射側とは反対側の面に形成され、接地電位に接続される表面ピニング層をさらに備える
前記(4)に記載の電子機器。
(6)
前記受光素子は、前記半導体層において前記カソードコンタクト領域と接するN型拡散層をさらに備え、
前記N型拡散層と前記半導体層の光入射側とは反対側の面との間が前記埋め込み層で覆われる
前記(4)に記載の電子機器。
3 受光チップ
11 画素アレイ部(受光素子の一例)
21 画素
22 SPAD素子
31 半導体層
31a 入射面
31b 反対面
32 センサ側配線層(配線層の一例)
43 N型拡散層
44 カソードコンタクト領域
47 アノードコンタクト領域
48 埋め込み層
49 表面ピニング層
61 カソード電極
62 アノード電極
Claims (4)
- 半導体層に形成され、アレイ状に配置される複数の画素ごとに設けられるSPAD(Single Photon Avalanche Diode)素子と、
前記半導体層に隣接する配線層に少なくとも一部が形成され、前記SPAD素子に逆バイアス電圧を印加するカソード電極およびアノード電極と、
前記半導体層に形成され、前記カソード電極に直接接続されるN型のカソードコンタクト領域と、
前記半導体層に形成され、前記アノード電極に直接接続されるP型のアノードコンタクト領域と、
前記カソードコンタクト領域と前記半導体層の光入射側とは反対側の面との間に位置する絶縁性の埋め込み層と、
を備え、
平面視において、前記アノードコンタクト領域は、前記画素の周縁部に位置し、
平面視において、前記カソードコンタクト領域は、前記アノードコンタクト領域よりも前記画素の中央側に位置し、
前記カソードコンタクト領域は、前記アノードコンタクト領域よりも前記半導体層の光入射側に位置する
受光素子。 - 前記半導体層における光入射側とは反対側の面に形成され、接地電位に接続される表面ピニング層をさらに備える
請求項1に記載の受光素子。 - 前記半導体層において前記カソードコンタクト領域と接するN型拡散層をさらに備え、
前記N型拡散層と前記半導体層の光入射側とは反対側の面との間が前記埋め込み層で覆われる
請求項1に記載の受光素子。 - 半導体層に形成され、アレイ状に配置される複数の画素ごとに設けられるSPAD(Single Photon Avalanche Diode)素子と、
前記半導体層に隣接する配線層に少なくとも一部が形成され、前記SPAD素子に逆バイアス電圧を印加するカソード電極およびアノード電極と、
前記半導体層に形成され、前記カソード電極に直接接続されるN型のカソードコンタクト領域と、
前記半導体層に形成され、前記アノード電極に直接接続されるP型のアノードコンタクト領域と、
前記カソードコンタクト領域と前記半導体層の光入射側とは反対側の面との間に位置する絶縁性の埋め込み層と、
を備える受光素子を備え、
平面視において、前記アノードコンタクト領域は、前記画素の周縁部に位置し、
平面視において、前記カソードコンタクト領域は、前記アノードコンタクト領域よりも前記画素の中央側に位置し、
前記カソードコンタクト領域は、前記アノードコンタクト領域よりも前記半導体層の光入射側に位置する
電子機器。
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| CN202080037861.0A CN113853686B (zh) | 2019-07-31 | 2020-07-29 | 光接收元件和电子设备 |
| US17/626,249 US20220262970A1 (en) | 2019-07-31 | 2020-07-29 | Light receiving element and electronic device |
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| US12278253B2 (en) * | 2021-02-26 | 2025-04-15 | Taiwan Semiconductor Manufacturing Co., Ltd. | Backside diode design |
| JP7635034B2 (ja) * | 2021-03-22 | 2025-02-25 | キヤノン株式会社 | 光電変換装置、光電変換システム、および移動体 |
| JP2022148028A (ja) * | 2021-03-24 | 2022-10-06 | ソニーセミコンダクタソリューションズ株式会社 | センサ素子および測距システム |
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| DE102022112711A1 (de) | 2021-05-21 | 2022-11-24 | Ifm Electronic Gmbh | TOF-Bauelement mit einer Avalanche-Photodiode und einem n-dotiertem Volumen |
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