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Filterless Polarization‐Sensitive 2D Perovskite Narrowband Photodetectors
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-09-16 , DOI: 10.1002/adom.201900988 Lu Li 1 , Long Jin 1 , Yunxi Zhou 1 , Junze Li 1 , Jiaqi Ma 1 , Shuai Wang 1 , Wancai Li 1 , Dehui Li 2
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-09-16 , DOI: 10.1002/adom.201900988 Lu Li 1 , Long Jin 1 , Yunxi Zhou 1 , Junze Li 1 , Jiaqi Ma 1 , Shuai Wang 1 , Wancai Li 1 , Dehui Li 2
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Polarization‐sensitive narrowband photodetectors can respond to a narrow spectral range of light together with the ability to sense the polarization of light. Traditionally, expensive filters combined with polarizers are utilized to realize the polarization‐sensitive narrowband photodetections. To reduce the cost and simplify optical system, here a polarization‐sensitive narrowband photodetector based on 2D perovskite single crystals without any additional optical components is reported. The photodetector shows a linear dichroic ratio of 1.56 at 552 nm under the oblique incident angle of 45° and the full width at half maximum of 20 nm. Moreover, the photodetector exhibits a high external quantum efficiency of 120% and a peak specific detectivity of 1.23 × 1010 Jones under the normal illumination. This polarization‐sensitive narrowband photoresponse can be ascribed to the charge collection narrowing mechanism assisted by the enhanced self‐trapped states in 2D perovskites and the large anisotropic crystal structure between different crystal directions. In particular, the device configuration is specially designed so that the absorption anisotropy takes place between the in‐plane and out‐of‐plane directions and photogenerated carriers transport along the in‐plane direct to avoid the large organic barrier along the out‐of‐plane direction, resulting in the polarization‐sensitive narrowband photodetections with high performance.
中文翻译：
无滤波器偏振敏感二维钙钛矿窄带光电探测器
偏振敏感的窄带光电探测器可以对狭窄的光谱范围做出响应，并具有感知偏振的能力。传统上，昂贵的滤光片与起偏器结合使用来实现对偏振敏感的窄带光电检测。为了降低成本并简化光学系统，在此报道了一种基于偏振钙钛矿单晶体的偏振敏感窄带光电探测器，它没有任何附加的光学组件。光电探测器在45°倾斜入射角和20nm半峰全宽处在552 nm处显示1.56的线性二向色比。此外，该光电探测器的外部量子效率高，为120％，峰值比检测率为1.23×10 10。琼斯在正常照明下。这种偏振敏感的窄带光响应可以归因于电荷收集窄化机制，这归因于二维钙钛矿中增强的自陷状态和不同晶体方向之间的大各向异性晶体结构。特别是，器件的配置经过特殊设计，使得吸收各向异性发生在面内和面外方向之间，并且光生载流子直接沿面内传输，从而避免了沿面外方向的大有机势垒。偏振方向的窄带光电检测具有高性能。
更新日期：2019-12-03
中文翻译：
无滤波器偏振敏感二维钙钛矿窄带光电探测器
偏振敏感的窄带光电探测器可以对狭窄的光谱范围做出响应，并具有感知偏振的能力。传统上，昂贵的滤光片与起偏器结合使用来实现对偏振敏感的窄带光电检测。为了降低成本并简化光学系统，在此报道了一种基于偏振钙钛矿单晶体的偏振敏感窄带光电探测器，它没有任何附加的光学组件。光电探测器在45°倾斜入射角和20nm半峰全宽处在552 nm处显示1.56的线性二向色比。此外，该光电探测器的外部量子效率高，为120％，峰值比检测率为1.23×10 10。琼斯在正常照明下。这种偏振敏感的窄带光响应可以归因于电荷收集窄化机制，这归因于二维钙钛矿中增强的自陷状态和不同晶体方向之间的大各向异性晶体结构。特别是，器件的配置经过特殊设计，使得吸收各向异性发生在面内和面外方向之间，并且光生载流子直接沿面内传输，从而避免了沿面外方向的大有机势垒。偏振方向的窄带光电检测具有高性能。
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