期刊
APPLIED SURFACE SCIENCE
卷 541, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148380
关键词
Wide-bandgap semiconductor materials; Surface modification; Photoelectrochemical; Solar-blind ultraviolet detection
类别
资金
- National Key Research and Development Program of China [2019YFA0705201]
- National Natural Science Foundation of China [61774051, 61574051]
A novel tree-like branched structure with α-Ga2O3 covered by γ-Al2O3 was successfully fabricated by a simple two-step hydrothermal treatment, which could accelerate the separation of photogenerated carriers and suppress interfacial charge recombination to improve the detection performance of the photoelectrochemical device.
For photoelectrochemical ultraviolet detector, carrier recombination, low light trapping efficiency and long-distance charge carries transport are the main factors restricting its detection performance. Herein, a novel tree-like branched structure with alpha-Ga2O3 covered by gamma-Al2O3 has been successfully fabricated by simple two-step hydrothermal treatment and applied into the self-powered photoelectrochemical solar-blind detector. Owning to the introduction of gamma-Al2O3 layer with ultra-wide bandgap to coat outside of alpha-Ga2O3, an energy barrier has been established at the semiconductor/electrolyte interface accelerating the photogenerated carriers separation and thus suppressing interfacial charge recombination. Besides, the obtained tree-like branched structure significantly expands the contact surface area between carries and electrolyte to shorten the distance of charge transport improving response speed and brings a larger specific surface area to capture and scatter incident photons enhancing light absorption. Campared with the pure alpha-Ga2O3, the alpha-Ga2O3-gamma-Al2O3 based on the photoelectrochemical device shows higher responsivity, larger photocurrent density and faster response time to solar-blind ultraviolet signal, some performance improvements exceed 100%, indicating the highly efficient detection.
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