Zhou Hai, Zeng Junpeng, Song Zhaoning, Grice Corey R, Chen Cong, Song Zehao, Zhao Dewei, Wang Hao, Yan Yanfa
Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization , The University of Toledo , Toledo , Ohio 43606 , United States.
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, Faculty of Physics & Electronic Science , Hubei University , Wuhan 430062 , People's Republic of China.
J Phys Chem Lett. 2018 Apr 19;9(8):2043-2048. doi: 10.1021/acs.jpclett.8b00700. Epub 2018 Apr 9.
Organic-inorganic lead halide perovskite microcrystal (MC) films are attractive candidates for fabricating high-performance large-area self-powered photodetectors (PDs) because of their lower trap state density and higher carrier mobility than their polycrystalline counterparts and more suitability of synthesizing large lateral area films than their single-crystal counterparts. Here, we report on the fabrication of self-powered all-inorganic CsPbBr perovskite MC PDs with high detectivity, using a modified solution synthesis method. The MCs are up to about 10 μm in size, and the MC layer is also about 11 μm in thickness. Under 473 nm laser (100 mW) illumination, the CsPbBr MC PDs show responsivity values of up to 0.172 A W, detectivity values of up to 4.8 × 10 Jones, on/off ratios of up to 1.3 × 10, and linear dynamic ranges of up to 113 dB. These performances are significantly better than those of PDs based on polycrystalline perovskite thin films and comparable with those of PDs based on perovskite single crystals.
有机-无机卤化铅钙钛矿微晶（MC）薄膜是制造高性能大面积自供电光电探测器（PD）的有吸引力的候选材料，因为与多晶对应物相比，它们具有更低的陷阱态密度和更高的载流子迁移率，并且与单晶对应物相比，更适合合成大面积横向薄膜。在此，我们报告了使用改进的溶液合成方法制备具有高探测率的自供电全无机CsPbBr钙钛矿MC PD。微晶尺寸可达约10μm，MC层厚度也约为11μm。在473nm激光（100mW）照射下，CsPbBr MC PD的响应度值高达0.172A/W，探测率值高达4.8×10 Jones，开/关比高达1.3×10，线性动态范围高达113dB。这些性能明显优于基于多晶钙钛矿薄膜的PD，与基于钙钛矿单晶的PD相当。
