Facile synthesis of 1D perovskite microwire arrays with ultrafast photoresponse

Abstract Perovskite materials are ideal candidates for the activity layers in electrooptic components due to their effective light absorption and high carrier mobility. However, perovskites produced through traditional solution methods often suffer from poor crystallinity and high defect density and are susceptible to damage under high temperature and light exposure, which limits device performance. In this work, high-quality 1D single-crystal CsPbBr 3 microwire (MW) arrays are successfully synthesized on muscovite substrates using chemical vapor deposition (CVD) by optimizing growth parameters such as growth time, temperature, and substrate position. The photodetector based on the as-grown MWs exhibits outstanding photoelectric performance, achieving a light-to-dark current ratio of up to 5.53 × 10 2 at a working voltage of 5 V and a photoresponsivity of up to 9.4 × 10 −4 A W −1 at a small illumination power intensity of 1 mW cm −2 . Additionally, this photodetector demonstrates an ultrarapid photoresponse time with a fall time of 140 μs and a rise time of 92 μs under a 365 nm laser. This research presents a facile and controllable strategy for synthesizing high-quality 1D perovskites with ultrafast photoresponse, which access the mean for developing high-performing 1D perovskite photodetectors.