Because of the good thermal stability and superior carrier transport characteristics of formamidinium lead trihalide perovskite HC(NH₂)₂PbX₃ (FAPbX₃), it has been considered to be a better optoelectronic material than conventional CH₃NH₃PbX₃ (MAPbX₃). Herein, we fabricated a FAPbBr₃ microcrystal-based photodetector that exhibited a good responsivity of 4000 A W⁻¹ and external quantum efficiency up to 10⁶% under one-photon excitation, corresponding to the detectivity greater than 10¹⁴ Jones. The responsivity is two orders of magnitude higher than that of previously reported formamidinium perovskite photodetectors. Furthermore, the FAPbBr₃ photodetector’s responsivity to two-photon absorption with an 800-nm excitation source can reach 0.07 A W⁻¹, which is four orders of magnitude higher than that of its MAPbBr₃ counterparts. The response time of this photodetector is less than 1 ms. This study provides solid evidence that FAPbBr₃ can be an excellent candidate for highly sensitive and fast photodetectors.

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由于甲ami鎓三卤化钙钛矿HC（NH ₂）₂ PbX ₃（FAPbX ₃）的良好的热稳定性和优异的载流子传输特性，它被认为是比常规CH ₃ NH ₃ PbX ₃（MAPbX _3）更好的光电材料。）。本文中，我们制造了一种基于FAPbBr ₃微晶的光电探测器，该探测器在单光子激发下具有4000 A W ^-1的良好响应度和高达10 ⁶％的外部量子效率，对应于大于10 ¹⁴的探测率琼斯 响应度比以前报道的甲ami钙钛矿光电探测器高两个数量级。此外，FAPbBr ₃光电探测器对800 nm激发源对双光子吸收的响应度可以达到0.07 A W ^-1，比其MAPbBr ₃对应物高出四个数量级。该光电探测器的响应时间小于1毫秒。这项研究提供了有力的证据，表明FAPbBr ₃可以成为高灵敏度和快速光电探测器的绝佳候选者。

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