Synthesis, crystal structure and photoresponse of tetragonal phase single crystal CH3NH3PbCl3

Abstract

The performance of lead halogen perovskite is often closely related to its crystal structure. However, the chemical and optoelectronic properties of tetragonal phase single crystal MAPbCl₃ (SC T-MAPbCl₃) are rarely reported. In this study, we synthesized SC T-MAPbCl₃ with the P4/mcc (124) space group by a modified inverse temperature crystallization (M-ITC) method. The twist angle of the Cl anion on the equatorial plane of the PbCl₆⁴⁻ octahedron around the c-axis is 8.4°. The resistance (62 MΩ) of SC T-MAPbCl₃ obviously decreased to 3 MΩ under 395 and 404 nm ultraviolet light. The photodetector based on SC T-MAPbCl₃ under 3 V bias voltage exhibits high sensitivity (2.60 μA cm⁻² under 1 W m⁻² light intensity). The high selectivity of the device is in the ultraviolet region, rather than the visible region.