Controllable preparation of high-quality MAPbCl3 perovskite single crystal sheets

Hybrid perovskite CH ₃NH ₃PbCl ₃ single crystals have received much attention in the field of photodetectors due to their outstanding optoelectronic properties. Herein, a simple growth method of CH ₃NH ₃PbCl ₃ single crystal sheets was demonstrated in detail. The steady-state solution micro-reaction method with the small-hole rate control and the liquid-surface height control effectively solves the disadvantages of liquid- and gas-phase methods and realizes the preparation of a CH ₃NH ₃PbCl ₃ single crystal sheet with the controllable growth rate, size, and thickness, and good crystal quality and high crystallinity. Moreover, photodetectors based on one CH ₃NH ₃PbCl ₃ single crystal perovskite were fabricated with the responsivity of 80 mA/W under 395 nm light at 5 V. Meanwhile, a rise time of 22.3 µs and a fall time of 16.5 µs were obtained, indicative of a relatively fast response. These findings demonstrate that the CH ₃NH ₃PbCl ₃ single crystal perovskite have great potential applications in optoelectronic fields.