High-performance perovskite photodetectors based on solution-processed all-inorganic CsPbBr3 thin films

Abstract

Halide perovskites have attracted increasing attention in recent years as promising materials for optoelectronic devices. Herein, we report the use of a one-step spin-coating method for the preparation of all-inorganic CsPbBr₃ perovskite thin film photodetectors. For the preparation of devices, the all-inorganic CsPbBr₃ perovskite thin films were applied onto the interdigitated (IDT) patterned Au electrodes, and symmetrically structured photoconductive detectors were obtained. Photoresponse analysis reveals that a high photoresponsivity of 55 A W⁻¹, an on/off photocurrent ratio of 1.06 × 10⁵, a specific detectivity of up to 0.9 × 10¹³ Jones, an external quantum efficiency (EQE) of 16 700%, and a fast response speed of 430/318 μs were achieved in the fabricated CsPbBr₃ photodetectors. Such performances are much better than those of most perovskite photodetectors from CsPbBr₃ nanocrystals, and comparable with the highest results reported on organic–inorganic perovskite photodetectors. This work opens up an exciting opportunity for using all-inorganic perovskites for high-performance and low-cost photodetection applications.