Abstract
UV-visible broadband light harvesting ability is critical for photodetectors,and all inorganic perovskite CsPbBr3 is regarded as a promising candidate as the response active material.Herein,a saturated-solution crystallization method is employed to synthesize CsPbBr3 single crystal.Temperature-dependent photo-luminescence spectra with one-photon and two-photon excitation are systematically investigated,deter-mining a large exciton binding energy of 39.8 meV.This allows the stable excitonic emission of CsPbBr3 single crystal at room temperature.Subsequently,an asymmetric structure CsPbBr3 photodetector is fab-ricated by using InGa alloy as the Ohmic electrode and Au as the Schottky electrode.At-8 V,the device exhibits a prominent response to the irradiation from UV to green band with a maximum responsiv-ity of 2.56 A/W,an external quantum efficiency of 580％,and a detectivity of 1.24 × 1013 Hz1/2 W-1.In addition,the CsPbBr3 photodetector also presents rapid response speeds at both reverse and forward bias voltages and self-powered characteristics owing to the Schottky depletion layer underneath the Au electrode.The demonstration of asymmetric metal-semiconductor-metal(MSM)structure photodetector presents a promising pathway toward next-generation CsPbBr3 optoelectronic devices.
基金项目
National Natural Science Foundation of China(52172149)
National Natural Science Foundation of China(61705043)
Dongguan University of Technology Startup Fund(221110144)
NETL
NSTL
万方数据