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In Situ Formed Gradient Bandgap-Tunable Perovskite for Ultrahigh-Speed Color/Spectrum-Sensitive Photodetectors via Electron-Donor Control.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-02-20 , DOI: 10.1002/adma.201908108 Haoxuan Sun 1 , Wei Tian 2 , Xianfu Wang 1 , Kaimo Deng 2 , Jie Xiong 1 , Liang Li 2
Advanced Materials ( IF 27.4 ) Pub Date : 2020-02-20 , DOI: 10.1002/adma.201908108 Haoxuan Sun 1 , Wei Tian 2 , Xianfu Wang 1 , Kaimo Deng 2 , Jie Xiong 1 , Liang Li 2
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Integration of various photodetectors with different light-sensitive materials and detection capacity is an inevitable way to achieve entire color/spectrum detection. However, the uneven capacity of each photodetector would drag the overall performance behind, especially the response speed. A response time down to nanosecond level has not previously been reported for a filter-free color/spectrum-sensitive photodetector, as far as is known. Here, a self-powered filterless color-sensitive photodetection array based on an in situ formed gradient perovskite absorber film with continuously tunable bandgap is demonstrated. Ultrahigh-speed response at nanosecond level is achieved in all the ingredient photodetectors. The junction capacitance being influenced by carrier concentration in the absorber is identified to be responsible for the detection speed. Without any optic or mechanical supporting system, the designed color detector exhibits an external quantum efficiency (EQE) up to 94% and a high spectral resolution of around 80 nm for the whole visible spectrum. This work offers a guidance to achieve fast response of perovskite-based photodetectors from the point of view of carrier-donor control and demonstrates a new avenue to establish color-sensitive photodetectors/spectrometers.
中文翻译：
原位形成的梯度带隙可调钙钛矿，用于通过电子施主控制实现超高速彩色/光谱敏感光电探测器。
将各种光电探测器与不同的感光材料和检测能力集成在一起是实现整个颜色/光谱检测的必然方法。但是，每个光电探测器的容量不均会拖延整体性能，尤其是响应速度。就目前所知，无滤光片对颜色/光谱敏感的光电检测器的响应时间尚未达到纳秒级。在此，展示了一种基于原位形成的具有连续可调带隙的梯度钙钛矿吸收体薄膜的自供电无滤光片彩色光敏检测阵列。所有成分光电探测器均实现了纳秒级的超高速响应。受吸收器中载流子浓度影响的结电容被确定为检测速度的原因。在没有任何光学或机械支持系统的情况下，设计的彩色检测器可显示高达94％的外部量子效率（EQE），并在整个可见光谱范围内具有约80 nm的高光谱分辨率。这项工作从载流子供体控制的角度为实现基于钙钛矿的光电探测器的快速响应提供了指导，并展示了建立色敏光电探测器/光谱仪的新途径。
更新日期：2020-04-08
中文翻译：
原位形成的梯度带隙可调钙钛矿，用于通过电子施主控制实现超高速彩色/光谱敏感光电探测器。
将各种光电探测器与不同的感光材料和检测能力集成在一起是实现整个颜色/光谱检测的必然方法。但是，每个光电探测器的容量不均会拖延整体性能，尤其是响应速度。就目前所知，无滤光片对颜色/光谱敏感的光电检测器的响应时间尚未达到纳秒级。在此，展示了一种基于原位形成的具有连续可调带隙的梯度钙钛矿吸收体薄膜的自供电无滤光片彩色光敏检测阵列。所有成分光电探测器均实现了纳秒级的超高速响应。受吸收器中载流子浓度影响的结电容被确定为检测速度的原因。在没有任何光学或机械支持系统的情况下，设计的彩色检测器可显示高达94％的外部量子效率（EQE），并在整个可见光谱范围内具有约80 nm的高光谱分辨率。这项工作从载流子供体控制的角度为实现基于钙钛矿的光电探测器的快速响应提供了指导，并展示了建立色敏光电探测器/光谱仪的新途径。
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