Synthesis of PbI2 nanowires for high sensitivity photodetectors

Abstract

A simple catalyst-free physical vapor transport method was used to synthesize lead iodide (PbI₂) nanowires of high crystalline quality. The photodetectors based on the single PbI₂ nanowire were fabricated by FIB technique, and their light-induced electric properties were investigated in detail. The photoswitch current ratio of the single PbI₂ nanowire photodetector is 48 under the illumination of 450 nm light with an optical power of 360 mW cm⁻² at a bias of 3 V. The responsivity, R, of the detector at 3 V is about 100 mA W⁻¹. Generally, high-yield PbI₂ nanowires synthesized by the physical vapor transport method are promising candidates for high-performance photodetectors.