Tailoring photodetection performance of self-powered Ga2O3 UV solar-blind photodetectors through asymmetric electrodes. Issue 16 (5th April 2023)

• Record Type: Journal Article
• Authors: Gu, Keyun; Zhang, Zilong; Huang, Haofei; Tang, Ke; Huang, Jian; Liao, Meiyong; Wang, Linjun
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 16(2023)
• Page Start: 5371
• Page End: 5377
• Publication Date: 2023-04-05
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d3tc00387f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Self-powered solar-blind UV detectors are playing an increasingly critical role in the sustainable development of photodetectors with low energy consumption. Abstract : 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-Ga2 O3 based photodetectors with metal–semiconductor–metal (MSM) structures. The results indicate that the Au/Ti/Ga2 O3 /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 W −1, 0.07%, and 3.1 × 10 9 cm Hz 1/2 W −1 @0 V, respectively. The asymmetric-electrode-material photodetectors with Au/Ti/Ga2 O3 /GZO and Au/Ti/Ga2 O3 /Au structures possess photodetection performances of R, EQE, and D * of 0.591 mA W −1, 0.29%, and 2.9 × 10 9 cm Hz 1/2 W −1 and 0.148 mA W −1, 0.07%, and 7.8 × 10 8 cm Hz 1/2 W −1 @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-Ga2 O3 based photodetectors have a fast photo-response speed, high stability and high repeatability. These findings provide a promising and facile route to fabricate a-Ga2 O3 self-powered solar-blind UV photodetectors with high photodetection.