High sensitivity and rapid response ultraviolet photodetector of a tetragonal CsPbCl<sub>3</sub> perovskite single crystal
Ziyue Rao, Wenyi Liang, Haiming Huang, Jun Ge, Weiliang Wang, Shusheng Pan
Abstract
Inorganic perovskite has attracted great interest due to its excellent optoelectronic properties. There are much less low band gap halide perovskite semiconductors, and CsPbCl 3 is one of a wide band gap semiconductor in the perovskite family. In this study, a 0.5-mm CsPbCl 3 perovskite single crystal with tetragonal structure and a direct band gap of 2.86 ± 0.3 eV is synthesized by flash evaporation of CsCl-PbCl 2 solution. An ultraviolet photodetector based on a CsPbCl 3 single crystal is fabricated, showing a photoresponse in a wide wavelength range of 280–435 nm, with a maximum responsivity of 0.272 A/W at 410 nm. Rise and decay response times of the device are less than 28.4 and 2.7 ms, respectively. The good performance of this CsPbCl 3 photodetector indicates promising applications in the field of UV optoelectronic devices.