论文部分内容阅读
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 CH3NH3-PbX3 (MAPbX3). Herein, we fabricated a FAPbBr3 microcrys-tal-based photodetector that exhibited a good responsivity of 4000 A W-1 and extal 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 per-ovskite 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 counter-parts. 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.