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

光电探测器 光电效应 紫外线 光电流 光电子学 材料科学 符号 物理 数学 算术
作者
Lei Li,Zeng Liu,Kai Tang,Shulin Sha,Shaohui Zhang,Mingming Jiang,Maolin Zhang,Ang Bian,Yufeng Guo,Weihua Tang
出处
期刊:IEEE Sensors Journal [IEEE Sensors Council]
卷期号:23 (12): 12767-12774 被引量:8
标识
DOI:10.1109/jsen.2023.3273558
摘要

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 $_{{0}.{1}}$ Ga $_{{0}.{9}}\text{N}$ (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 mA $\text{W}^{-{1}}$ under the illumination of $135 \mu \text{W}$ cm $^{-{2}}$ . More importantly, after pyro-photoelectric enhancement, the photocurrent is effectively increased from 13 to 45 pA. Additionally, under the illumination of $493 \mu \text{W}$ cm $^{-{2}}$ , the photo-to-dark-current ratio (PDCR) of 80 and ${{1}.{7} \times {10}}^{{4}}$ is 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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