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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 Ga-doped ZnO (ZnO:Ga)/Al_0.1Ga_0.9N(AlGaN) 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 aresponsivity of 0.063 mAW^-1under the illumination of135 μ Wcm^-2. More importantly, after pyro-photoelectric enhancement, the photocurrent is effectively increased from 13 to 45 pA. Additionally, under the illumination of493 μ Wcm^-2, the photo-to-dark-current ratio (PDCR) of 80 and1.7 × 10^4is obtained at a 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 a decay time of 9.4 ms. In all, this work presents a novel strategy for the advancement of UV detection.
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Li et al. (2023) studied this question.
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