JP2023038266A - 半導体素子および電子機器 - Google Patents
半導体素子および電子機器 Download PDFInfo
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- JP2023038266A JP2023038266A JP2023003152A JP2023003152A JP2023038266A JP 2023038266 A JP2023038266 A JP 2023038266A JP 2023003152 A JP2023003152 A JP 2023003152A JP 2023003152 A JP2023003152 A JP 2023003152A JP 2023038266 A JP2023038266 A JP 2023038266A
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Abstract
Description
1.第1の実施の形態(素子基板の周辺領域が読出回路基板との接合面を有する受光素子の例)
2.変形例1(第1埋込層および第2埋込層を有する例)
3.変形例2(カラーフィルタおよびオンチップレンズを有する例)
4.第2の実施の形態(キャップ層を用いて製造された受光素子の例)
5.第3の実施の形態(素子基板にシリコンを含む半導体層が積層された受光素子の例)
6.適用例1(撮像素子の例)
7.適用例2(電子機器の例)
8.応用例1(内視鏡手術システムへの応用例)
9.応用例2(移動体への応用例)
[構成]
図1A,図1Bは、本開示の第1の実施の形態に係る半導体素子(受光素子1)の模式的な構成を表したものである。図1Aは、受光素子1の平面構成を表し、図1Bは、図1AのB-B’線に沿った断面構成を表している。この受光素子1は、例えばIII-V族半導体などの化合物半導体材料を用いた赤外線センサ等に適用されるものであり、例えば、可視領域(例えば380nm以上780nm未満)~短赤外領域(例えば780nm以上2400nm未満)の波長の光に、光電変換機能を有している。この受光素子1には、例えば2次元配置された複数の受光単位領域P(画素P)が設けられている(図1B)。
受光素子1は、例えば次のようにして製造することができる。図4A~図14Jは、受光素子1の製造工程を工程順に表したものである。
受光素子1では、パッシベーション膜16、第2電極15および第2コンタクト層14を介して、光電変換層13へ光(例えば可視領域および赤外領域の波長の光)が入射すると、この光が光電変換層13において吸収される。これにより、光電変換層13では正孔(ホール)および電子の対が発生する(光電変換される)。このとき、例えば第1電極11に所定の電圧が印加されると、光電変換層13に電位勾配が生じ、発生した電荷のうち一方の電荷(例えば正孔)が、信号電荷として拡散領域12Aに移動し、拡散領域12Aから第1電極11へ収集される。この信号電荷が、コンタクト電極19E,22Eを通じて半導体基板21に移動し、画素P毎に読み出される。
本実施の形態の受光素子1は、素子基板10の周辺領域R2に埋込層18を有しており、周辺領域R2にも読出回路基板20との接合面S2が設けられている。この埋込層18は、受光素子1を形成する際に半導体層10Sと仮基板33との段差を埋めるためのものであり、この埋込層18を形成することにより、半導体層10Sと仮基板33との段差に起因した製造工程の不具合の発生を抑えることができる。以下、これについて説明する。
図15は、上記第1の実施の形態の変形例1に係る受光素子(受光素子1A)の要部の断面構成を表したものである。この受光素子1Aは、埋込層18が、積層された第1埋込層18Aおよび第2埋込層18Bを含んでいる。この点を除き、受光素子1Aは受光素子1と同様の構成および効果を有している。
図20は、上記第1の実施の形態の変形例2に係る受光素子(受光素子1B)の要部の断面構成を表したものである。この受光素子1Bは、素子基板10の光入射面S1(読出回路基板20との対向面と反対面)にカラーフィルタ層41およびオンチップレンズ(集光レンズ)42を有している。この点を除き、受光素子1Bは受光素子1と同様の構成および効果を有している。
図21A~図21Eは、第2の実施の形態に係る受光素子(図22の受光素子2)の製造工程を工程順に表したものである。この受光素子2は、半導体層10Sを保護するためのキャップ層(図21Aのキャップ層35)を形成した後に、このキャップ層を間にして半導体層10Sを仮基板33に接合し、製造される。この点を除き、受光素子2は、受光素子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26は、第3の実施の形態に係る受光素子(受光素子3)の断面構成を模式的に表したものである。この受光素子3は、化合物半導体材料を含む素子基板10とシリコン(Si)を含む半導体層(半導体層51S、第2半導体層)との積層構造を有している。この点を除き、受光素子3は、受光素子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。
上記実施の形態等において説明した受光素子1(または、受光素子1A,1B,2,3、以下、まとめて受光素子1という)は、例えば、撮像素子に適用される。この撮像素子は、例えば赤外線イメージセンサである。
上述の撮像素子は、例えば赤外領域を撮像可能なカメラなど、様々なタイプの電子機器に適用することができる。図27に、その一例として、電子機器5(カメラ)の概略構成を示す。この電子機器5は、例えば静止画または動画を撮影可能なカメラであり、受光素子1により構成された撮像素子4と、光学系(光学レンズ)310と、シャッタ装置311と、撮像素子4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。
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、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)
化合物半導体材料を含む第1半導体層および第1配線層を有する素子領域、および前記素子領域の外側の周辺領域を有する第1基板と、
読み出し回路を含む第2半導体層および第2配線層を有し、前記第1配線層と前記第2配線層とが対向するように積層され、前記第1基板と電気的に接続された第2基板とを備え、
前記第1基板は、前記第1半導体層の周囲を覆うように前記素子領域および前記周辺領域に亘って設けられた埋込層を有する
半導体素子。
(2)
前記第1基板の前記素子領域は、前記周辺領域の前記第2基板との接合面と同一平面上で、前記第2基板に接合されている
前記(1)に記載の半導体素子。
(3)
更に、前記第1配線層に設けられるとともに、前記第1半導体層に電気的に接続された第1電極と、
前記第1半導体層を間にして前記第1電極に対向する第2電極とを有する
前記(1)または(2)に記載の半導体素子。
(4)
前記第1基板は、更に、前記埋込層に、前記第2電極と前記第2基板とを電気的に接続するための貫通孔を有する
前記(3)に記載の半導体素子。
(5)
前記埋込層は、前記第1半導体層よりも前記第2基板と反対側に突出している
前記(1)乃至(4)のうちのいずれか1つに記載の半導体素子。
(6)
前記第1半導体層と前記埋込層との間に凹部が設けられている
前記(1)乃至(5)のうちのいずれか1つに記載の半導体素子。
(7)
前記埋込層は、前記第1半導体層の厚み方向にわたって設けられている
前記(1)乃至(6)のうちのいずれか1つに記載の半導体素子。
(8)
前記第1基板は、更に、前記第1半導体層の前記第2基板との対向面とは反対面の周縁にキャップ層を有する
前記(1)乃至(7)のうちのいずれか1つに記載の半導体素子。
(9)
前記第1配線層は、前記周辺領域にも設けられている
前記(1)乃至(8)のうちのいずれか1つに記載の半導体素子。
(10)
前記化合物半導体材料は、赤外領域の波長の光を吸収する
前記(1)乃至(9)のうちのいずれか1つに記載の半導体素子。
(11)
前記化合物半導体材料は、InGaAs,InAsSb,InAs,InSbおよびHgCdTeのうちのいずれか1つである
前記(1)乃至(10)のうちのいずれか1つに記載の半導体素子。
(12)
更に、前記第1半導体層の前記第2基板との対向面とは反対面側に、オンチップレンズを有する
前記(1)乃至(11)のうちのいずれか1つに記載の半導体素子。
(13)
更に、前記第1基板に積層して設けられるとともに、フォトダイオードを含む第2半導体層を有する
前記(1)乃至(12)のうちのいずれか1つに記載の半導体素子。
(14)
化合物半導体材料を含む第1半導体層および第1配線層を有する素子領域、および前記素子領域の外側の周辺領域を有する第1基板と、
読み出し回路を含む第2半導体層および第2配線層を有し、前記第1配線層と前記第2配線層とが対向するように積層され、前記第1基板と電気的に接続された第2基板とを備え、
前記第1基板は、前記第1半導体層の周囲を覆うように前記素子領域および前記周辺領域に亘って設けられた埋込層を有する
半導体素子を有する電子機器。
Claims (14)
- 化合物半導体材料を含む第1半導体層および第1配線層を有する素子領域、および前記素子領域の外側の周辺領域を有する第1基板と、
読み出し回路を含む第2半導体層および第2配線層を有し、前記第1配線層と前記第2配線層とが対向するように積層され、前記第1基板と電気的に接続された第2基板とを備え、
前記第1基板は、前記第1半導体層の周囲を覆うように前記素子領域および前記周辺領域に亘って設けられた埋込層を有する
半導体素子。 - 前記第1基板の前記素子領域は、前記周辺領域の前記第2基板との接合面と同一平面上で、前記第2基板に接合されている
請求項1に記載の半導体素子。 - 更に、前記第1配線層に設けられるとともに、前記第1半導体層に電気的に接続された第1電極と、
前記第1半導体層を間にして前記第1電極に対向する第2電極とを有する
請求項1に記載の半導体素子。 - 前記第1基板は、更に、前記埋込層に、前記第2電極と前記第2基板とを電気的に接続するための貫通孔を有する
請求項3に記載の半導体素子。 - 前記埋込層は、前記第1半導体層よりも前記第2基板と反対側に突出している
請求項1に記載の半導体素子。 - 前記第1半導体層と前記埋込層との間に凹部が設けられている
請求項1に記載の半導体素子。 - 前記埋込層は、前記第1半導体層の厚み方向にわたって設けられている
請求項1に記載の半導体素子。 - 前記第1基板は、更に、前記第1半導体層の前記第2基板との対向面とは反対面の周縁にキャップ層を有する
請求項1に記載の半導体素子。 - 前記第1配線層は、前記周辺領域にも設けられている
請求項1に記載の半導体素子。 - 前記化合物半導体材料は、赤外領域の波長の光を吸収する
請求項1に記載の半導体素子。 - 前記化合物半導体材料は、InGaAs,InAsSb,InAs,InSbおよびHgCdTeのうちのいずれか1つである
請求項1に記載の半導体素子。 - 更に、前記第1半導体層の前記第2基板との対向面とは反対面側に、オンチップレンズを有する
請求項1に記載の半導体素子。 - 更に、前記第1基板に積層して設けられるとともに、フォトダイオードを含む第2半導体層を有する
請求項1に記載の半導体素子。 - 化合物半導体材料を含む第1半導体層および第1配線層を有する素子領域、および前記素子領域の外側の周辺領域を有する第1基板と、
読み出し回路を含む第2半導体層および第2配線層を有し、前記第1配線層と前記第2配線層とが対向するように積層され、前記第1基板と電気的に接続された第2基板とを備え、
前記第1基板は、前記第1半導体層の周囲を覆うように前記素子領域および前記周辺領域に亘って設けられた埋込層を有する
半導体素子を有する電子機器。
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KR20190139844A (ko) | 2019-12-18 |
TW201842659A (zh) | 2018-12-01 |
EP3614434A4 (en) | 2020-04-15 |
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