1 College of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; 2 National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies, Nanjing University of Posts and Telecommunications, Nanjing 210023, China; 3 State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Abstract A self-powered solar-blind ultraviolet (UV) photodetector (PD) was successfully constructed on a GaO/BiWO heterojunction, which was fabricated by spin-coating the hydrothermally grown BiWO onto MOCVD-grown GaO film. The results show that a typical type-I heterojunction is formed at the interface of the GaO film and clustered BiWO, which demonstrates a distinct photovoltaic effect with an open-circuit voltage of 0.18 V under the irradiation of 254 nm UV light. Moreover, the GaO/BiWO PD displays excellent photodetection performance with an ultra-low dark current of fA, and a high light-to-dark current ratio (PDCR) of in self-powered mode (0 V), as well as a best responsivity result of 2.21 mA/W in power supply mode (5 V). Furthermore, the PD possesses a stable and fast response speed under different light intensities and voltages. At zero voltage, the PD exhibits a fast rise time of 132 ms and 162 ms, as well as a quick decay time of 69 ms and 522 ms, respectively. In general, the newly attempted GaO/BiWO heterojunction may become a potential candidate for the realization of self-powered and high-performance UV photodetectors.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFB3605404), Natural Science Research Start up Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications (Grant Nos. XK1060921119, XK1060921115, and XK1060921002), National Natural Science Foundation of China (Grant No. 62204125), and China Postdoctoral Science Foundation (Grant No. 2022M721689).
Li-Li Yang(杨莉莉), Yu-Si Peng(彭宇思), Zeng Liu(刘增), Mao-Lin Zhang(张茂林),Yu-Feng Guo(郭宇锋), Yong Yang(杨勇), and Wei-Hua Tang(唐为华) A self-powered ultraviolet photodetector based on a Ga2O3/Bi2WO6 heterojunction with low noise and stable photoresponse 2023 Chin. Phys. B 32 047301
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