JP7531162B2 - 撮像素子、撮像素子の製造方法及び撮像装置 - Google Patents
撮像素子、撮像素子の製造方法及び撮像装置 Download PDFInfo
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- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
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- H—ELECTRICITY
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Description
第1電極と、
第2電極と、
前記第1電極と前記第2電極との間に配置され、光を電荷に変換する光電変換層と、
クロムの酸化物及び炭素を含み、前記第1電極と前記光電変換層との間に配置され、前記第1電極から前記光電変換層への電子の移動を抑制する電子ブロッキング層と、
を備える。
撮像素子は、例えば、CMOS(Complementary Metal Oxide Semiconductor)イメージセンサなどの撮像装置に使用される。撮像装置においては、光電変換層への光照射の有無によらず、光電変換層に電圧が印加されることがある。この場合、電極から光電変換層に電子が流れ、センサのS/N比が低下する。
本開示の第1態様に係る撮像素子は、
第1電極と、
前記第2電極と、
前記第1電極と前記第2電極との間に配置され、光を電荷に変換する光電変換層と、
クロムの酸化物及び炭素を含み、前記第1電極と前記光電変換層との間に配置され、前記第1電極から前記光電変換層への電子の移動を抑制する電子ブロッキング層と、
を備えている。
前記撮像素子は、第1電極と、第2電極と、前記第1電極と前記第2電極との間に配置された光電変換層と、前記第1電極と前記光電変換層との間に配置された電子ブロッキング層と、を備え、
前記電子ブロッキング層は、クロムの酸化物及び炭素を含み、
前記製造方法は、
前記電子ブロッキング層を形成することと、
光電変換材料を含む有機溶液を調製することと、
前記電子ブロッキング層に前記有機溶液を塗布することによって前記光電変換層を形成することと、
を含む。
第1から第5態様のいずれか1つの撮像素子と、
前記第1電極又は前記第2電極に電気的に接続された電荷蓄積領域と、
前記電荷蓄積領域に電気的に接続された電荷検出回路と、
を備えている。
図1Aは、本開示の一実施形態に係る撮像素子10Aの断面を示している。撮像素子10Aは、第1電極11、電子ブロッキング層12、光電変換層13及び第2電極14を備えている。光電変換層13は、第1電極11と第2電極14との間に配置されている。電子ブロッキング層12は、第1電極11と光電変換層13との間に配置されている。電子ブロッキング層12は、第1電極11と光電変換層13とに接している。光電変換層13は、電子ブロッキング層12と第2電極14とに接している。第1電極11、電子ブロッキング層12、光電変換層13及び第2電極14は、この順番で積層されている。第2電極14から光電変換層13に向けて光が入射するように、第2電極14、光電変換層13、電子ブロッキング層12及び第1電極11がこの順番で並んでいる。この並びによれば、電子ブロッキング層12における入射光の減衰を抑制することができる。
図1B及び図1Cは、それぞれ、変形例に係る撮像素子10B及び10Cの断面を示している。撮像素子10B及び10Cは、撮像素子10Aの構成に加え、基板15をさらに備えている。
図4は、本開示の一実施形態に係る撮像装置100の回路の一例を示している。図5は、本開示の一実施形態に係る撮像装置100における単位画素24の概略断面図である。
厚さ0.7mmのガラス基板の上に第1電極としてのITO電極を形成した。ITO電極の厚さは150nmであった。
実施例と同じ方法によって、Siウエハ上に厚さ15nmのクロム酸化物薄膜を形成した。これにより、クロム酸化物薄膜の分析用のサンプルを得た。
電子ブロッキング層を形成しなかったことを除き、実施例と同じ方法で比較例の撮像素子を作製した。
実施例及び比較例の撮像素子の漏れ電流を以下の方法で測定した。撮像素子を光から遮断した環境下に置き、第1電極及び第2電極のそれぞれに半導体パラメータアナライザ(Keysight社製、B1500A)の測定端子を接続した。第1電極に0Vの電圧を印加した。第2電極への印加電圧を10Vから20Vまで掃引させて電流値を測定した。結果を図6に示す。
11 第1電極
12 電子ブロッキング層
13 光電変換層
14 第2電極
15 基板
24 単位画素
34 電荷蓄積ノード
35 電荷検出回路
100 撮像装置
Claims (9)
- 第1電極と、
第2電極と、
前記第1電極と前記第2電極との間に配置され、光を電荷に変換する光電変換層と、
炭素を不純物として含むクロムの酸化物層であって、前記第1電極と前記光電変換層との間に配置され、前記第1電極から前記光電変換層への電子の移動を抑制する電子ブロッキング層と、
を備え、
前記電子ブロッキング層は、単一の層である、
撮像素子。 - 前記光電変換層が光電変換材料を含み、
前記光電変換材料が有機材料である、
請求項1に記載の撮像素子。 - 前記光電変換層は、波長が780nmから2000nmの近赤外光を吸収して前記電荷を生成する、
請求項1又は2に記載の撮像素子。 - 前記光電変換層の吸収ピーク波長が、780nmから2000nmの波長領域にある、 請求項1から3のいずれか1項に記載の撮像素子。
- 前記第2電極から前記光電変換層に向けて光が入射するように、前記第2電極、前記光電変換層、前記電子ブロッキング層及び前記第1電極がこの順番で並んでいる、
請求項1から4のいずれか1項に記載の撮像素子。 - 撮像素子の製造方法であって、
前記撮像素子は、第1電極と、第2電極と、前記第1電極と前記第2電極との間に配置された光電変換層と、前記第1電極と前記光電変換層との間に配置された電子ブロッキング層と、を備え、
前記電子ブロッキング層は、炭素を不純物として含むクロムの酸化物層であって、
前記電子ブロッキング層は、単一の層であり、
前記製造方法は、
前記電子ブロッキング層を形成することと、
光電変換材料を含む有機溶液を調製することと、
前記電子ブロッキング層に前記有機溶液を塗布することによって前記光電変換層を形成することと、
を含む、
撮像素子の製造方法。 - 前記電子ブロッキング層を金属有機化合物分解法によって形成する、
請求項6に記載の撮像素子の製造方法。 - 請求項1から5のいずれか1項に記載の撮像素子と、
前記第1電極又は前記第2電極に電気的に接続された電荷蓄積領域と、
前記電荷蓄積領域に電気的に接続された電荷検出回路と、
を備えた、
撮像装置。 - 第1電極と、
第2電極と、
前記第1電極と前記第2電極との間に配置され、光を電荷に変換する光電変換層と、
炭素を不純物として含むクロムの酸化物層であって、前記第1電極と前記光電変換層との間に配置され、前記第1電極から前記光電変換層への電子の移動を抑制する電子ブロッキング層と、
を備え、
前記電子ブロッキング層は、単一の層である、
光センサ。
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