Abstract

Organic–inorganic hybrid perovskite formamidinium lead bromide nanosheet (FAPbBr₃ NS) is regarded as a superior substance used to construct optoelectronic devices. However, its uncontrollable stability seriously affects its application in the field of photodetectors. In this paper, FAPbBr₃ is combined with cadmium sulfide nanobelt (CdS NB) to construct a hybrid device that greatly improves the stability and performance of the photodetector. The response of the FAPbBr₃ NS/CdS NB detector under 490 nm light illumination reaches 5712 A/W, while the response of the FAPbBr₃ photodetector under equivalent conditions is only 25.45 A/W. The photocurrent of the FAPbBr₃ NS/CdS NB photodetector is nearly 80.25% of the initial device after exposure to air for 60 days. The difference in electric field distribution between the single material device and the composite device is simulated by the finite-difference time-domain method. It shows the advantages of composite devices in photoconductive gain and directly promotes the hybrid device performance. This paper presents a new possibility for high stability, fast response photodetectors.

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