Multifunctional and smart solar-blind photodetectors are of great significance for many applications, particularly for communications, optoelectronic circuits, and environmental risk monitoring. In this study, a wire-shaped photoanode of the solar-blind photoelectrochemical (PEC)-type photodetector based on an α-Ga2O3 nanorods/electrolyte solid/liquid heterojunction is realized. In photovoltaic devices, a junction generally comprises two different solid materials to facilitate the separation of photogenerated electron–hole pairs. Similarly, a solid/liquid junction is formed between the semiconductor and the electrolyte in a PEC photodetector. The apparent rectification characteristics of the dark current indicate that the energy bands bend at the α-Ga2O3 nanorods/electrolyte interface. The local electric field in the semiconductor effectively promotes the separation of carriers. The photodetectors exhibit a high light/dark current ratio (Ilight/Idark) of 68.7; fast rise and decay response times of 0.1 and 0.06 s, respectively; and a high responsivity of 11.2 mA/W (@230 nm) at zero bias. The wire-shaped photoanode is beneficial for realizing potential omnidirectional solar-blind detection.
A wire-shaped photoanode of the solar-blind photoelectrochemical-type photodetector based on an α-Ga2O3 nanorods/electrolyte solid/liquid heterojunction
Note: This paper is part of the APL Special Collection on Metal Oxide Thin-Film Electronics.
Gang Wang, Xinmiao Zhang, Jiang Li, Zhaowen Bai, Hongchang Wu, Mengjing Jin, Jinyuan Zhou, Erqing Xie, Xiaojun Pan; A wire-shaped photoanode of the solar-blind photoelectrochemical-type photodetector based on an α-Ga2O3 nanorods/electrolyte solid/liquid heterojunction. Appl. Phys. Lett. 13 February 2023; 122 (7): 071101. https://doi.org/10.1063/5.0134093
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