Zhang Fengying, Yang Bin, Zheng Kaibo, Yang Songqiu, Li Yajuan, Deng Weiqiao, He Rongxing
Key Laboratory of Luminescence and Real-Time Analytical Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, People's Republic of China.
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, People's Republic of China.
Nanomicro Lett. 2018;10(3):43. doi: 10.1007/s40820-018-0196-2. Epub 2018 Apr 2.
Because of the good thermal stability and superior carrier transport characteristics of formamidinium lead trihalide perovskite HC(NH)PbX (FAPbX), it has been considered to be a better optoelectronic material than conventional CHNHPbX (MAPbX). Herein, we fabricated a FAPbBr microcrystal-based photodetector that exhibited a good responsivity of 4000 A W and external quantum efficiency up to 10% under one-photon excitation, corresponding to the detectivity greater than 10 Jones. The responsivity is two orders of magnitude higher than that of previously reported formamidinium perovskite photodetectors. Furthermore, the FAPbBr photodetector's responsivity to two-photon absorption with an 800-nm excitation source can reach 0.07 A W, which is four orders of magnitude higher than that of its MAPbBr counterparts. The response time of this photodetector is less than 1 ms. This study provides solid evidence that FAPbBr can be an excellent candidate for highly sensitive and fast photodetectors.
由于甲脒铅三卤化物钙钛矿HC(NH)PbX（FAPbX）具有良好的热稳定性和优异的载流子传输特性，它被认为是一种比传统的CHNHPbX（MAPbX）更好的光电器件材料。在此，我们制备了一种基于FAPbBr微晶的光电探测器，在单光子激发下，该探测器表现出4000 A W的良好响应度和高达10%的外量子效率，对应的探测率大于10 Jones。该响应度比先前报道的甲脒钙钛矿光电探测器高两个数量级。此外，FAPbBr光电探测器对800 nm激发源的双光子吸收响应度可达0.07 A W，比其MAPbBr同类器件高四个数量级。该光电探测器的响应时间小于1 ms。这项研究提供了确凿的证据，表明FAPbBr可以成为高灵敏度和快速光电探测器的优秀候选材料。
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