Growth of Large-Area All-Inorganic Single Crystalline Lead Halide Perovskite for Photosensors

Abstract

Photosensor which converts the optical signal into electrical signal is an essential element in optoelectronic integrated circuits. Lead halide perovskites have been widely investigated for photosensor applications due to their excellent photoelectronic properties and superior stability. Moreover, single crystalline perovskite films have fewer defects comparing with polycrystalline films, which can further improve the material properties. In this study, vapour phase epitaxy was used to grow large scale single crystalline CsPbBr3 thin films with lateral sizes up to 2.25 cm2, Microstructure characterization of the films reveals that they are of high quality, with smooth surfaces. Furthermore, photo sensors constructed on these single crystalline films exhibits excellent on/off current ratio of 2.4×105. Our work not only presents a facile method for producing large area CsPbBr3 single crystalline films but also provide a platform for developing high-quality halide per-ovskite photo sensors and their large-scale integration.