Self-powered diamond/β-Ga2O3 photodetectors for solar-blind imaging

Abstract

Self-powered solar-blind photodetectors based on diamond/β-Ga₂O₃ heterojunctions have been fabricated. Under zero bias, these photodetectors show a peak responsivity of 0.2 mA W⁻¹, and a sharp cutoff wavelength of 270 nm. The UV/visible rejection ratio is more than two orders of magnitude, indicating that these photodetectors respond mainly to solar-blind irradiation. These photodetectors can exhibit repeatability and stability without any external power supply. High quality images have been obtained using such a self-powered photodetector as a sensing pixel of an imaging system, and this study is the first report on the solar-blind imaging of Ga₂O₃ based photodetectors.