Pyro-Photoelectric Effect Enhanced Dual-Mode Self-Powered ITO/ZnO:Ga Microwire/AlGaN Thin-Film Heterojuncted Ultraviolet Imaging Photodetector

Ultraviolet (UV) photodetectors have received a significant amount of attention in a variety of areas; especially, self-powered photodetectors are anticipated to address the energy-saving demand in the astronautics under the photovoltaic effect. In this work, a ZnO:Ga/Al 0.1 Ga 0.9 N heterojunction is introduced for performing UV photodetector, which is enhanced by the pyro-photoelectric effect coupling of pyroelectric and photovoltaic effects. The heterojunction UV photodetector can operate in a self-powered mode with responsivity of 0.063 mA W -1 under the illumination of 135 μW cm -2 . More importantly, after pyro-photoelectric enhancement, the photocurrent is effectively increased from 13 pA to 45 pA. Additionally, under the illumination of 493 μW cm -2 , the photo-to-dark-current ratio ( PDCR ) of 80 and 1.7 × 10 4 are obtained at reverse bias of -10 V and forward bias of +10 V, respectively, indicating that the heterojunction UV photodetector can be regarded as a dual-mode photodetector since it can operate in both forward-biased photoconductive mode and reverse-biased depletion mode. Moreover, the UV photodetector exhibits a fast temporal pulsed laser response with a rising time of 0.79 ms and decay time of 9.4 ms. In all, this work presents a novel strategy for the advancement of UV detection.