Self-Powered Fast Response X-Ray Detector Based on Vertical p-NiO/Ga2O3 Heterojunction Diode

• Published in: IEEE photonics technology letters Vol. 36; no. 4; p. 1
• Main Authors: Zhang, Silong, Deng, Yuxin, Chen, Liang, Zhou, Leidang, Lu, Xing, Wang, Fangbao, Du, Xue, Li, Yang, He, Shiyi, Ouyang, Xiaoping
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.02.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Atomic properties; Carrier density; Detectors; Diodes; Electron tubes; Ga<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">2 O<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">3; Gallium oxides; heterojunction diode; Heterojunctions; Nickel oxides; P-n junctions; Physical properties; Schottky diodes; Sensors; Switches; Transient response; X ray detectors; X-rays
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2023.3348869

Ga 2 O 3 , as an ultra-wide band gap material with physical properties such as large atomic number, low intrinsic carrier density, and high irradiation tolerance, has shown great potential in X-ray detection. This paper reports a self-powered X-ray detector based on vertical p-NiO/Ga 2 O 3 heterojunction diodes (HJDs). Benefiting from the high quality and high built-in potential of the p-n heterojunction, the HJD detector exhibited a pronounced photovoltaic response to X-rays at 0 V with a sensitivity of 212 nC·Gy -1 ·cm -2 and a fast response time of less than 0.02 s in transient X-ray response measurements, which was much faster than that of the reported Ga 2 O 3 Schottky barrier diode (SBD) detector. The power-voltage ( P-V ) test indicated that the device conformed to typical photovoltaic characteristics with a maximum output power of 2.95 nW Moreover, the HJD detector showed a good linear property to various X-ray dose rates from 0.0383 Gy -1 ·s -1 to 1.149 Gy -1 ·s -1 .