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Self-powered solar-blind UV detectors are playing an increasingly critical role in the sustainable
development of photodetectors with low energy consumption. In this work, the design of electrode
structures, including an asymmetric-size structure and an asymmetric-material structure, was proposed to achieve self-powered photodetection function for the solar-blind UV a-Ga2O3 based photodetectors with metal–semiconductor–metal (MSM) structures. The results indicate that the Au/Ti/Ga2O3/Ti/Au photodetector with an asymmetric-electrode-size shows photodetection performances of responsivity (R), external quantum efficiency (EQE), and detectivity (D*) of 0.149 mA W1, 0.07%, and 3.1  109 cm Hz1/2 W1@0 V, respectively. The asymmetric-electrode-material photodetectors with Au/Ti/Ga2O3/GZO and Au/Ti/Ga2O3/Au structures possess photodetection performances of R, EQE, and D* of 0.591 mA W1, 0.29%, and 2.9  109 cm Hz1/2 W1 and 0.148 mA W1, 0.07%, and 7.8  108 cm Hz1/2 W1@0 V, respectively. The electrodes with the asymmetric-size structure and the asymmetric-material structure result in different Schottky barrier heights in the interfaces of the electrodes and films, which are favorable for realizing self-powered performance. The self-powered solar-blind UV a-Ga2O3 based photodetectors have a fast photo-response speed, high stability and high repeatability. These findings provide a promising and facile route to fabricate a-Ga2O3 self-powered solar-blind UV photodetectors with high photodetection.

権利情報:

• In Copyright
  

キーワード: UV detector, gallium oxide

刊行年月日: 2023-03-22

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Journal of Materials Chemistry C (ISSN: 20507526) vol. 11 issue. 16 p. 5371-5377

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4272

公開URL: https://doi.org/10.1039/D3TC00387F

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更新時刻: 2024-03-22 08:30:12 +0900

MDRでの公開時刻: 2024-03-22 08:30:12 +0900