Solar-blind UV photodetectors based on α-Ga2O3 prepared by a two-step hydrothermal method

In this study, α-Ga 2 O 3 nanorod arrays (NRAs) were grown using a simple and low-cost two-step hydrothermal method. Subsequently, a photoelectrochemical ultraviolet photodetector (PEC-UV PD) based on the α-Ga 2 O 3 NRAs was fabricated, which can operate at zero bias and has a performance far superi...

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Veröffentlicht in:Optical and quantum electronics 2024-06, Vol.56 (7), Article 1247
Hauptverfasser: Xue, Junjun, Xu, Kaicheng, Tong, Jiaming, Chen, Zhouyu, Fang, Haoyu, Wang, Saisai, Wang, Jin, Zhi, Ting
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Sprache:eng
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Zusammenfassung:In this study, α-Ga 2 O 3 nanorod arrays (NRAs) were grown using a simple and low-cost two-step hydrothermal method. Subsequently, a photoelectrochemical ultraviolet photodetector (PEC-UV PD) based on the α-Ga 2 O 3 NRAs was fabricated, which can operate at zero bias and has a performance far superior to that of PEC-UV PDs based on the one-step hydrothermal method. Under 2 mW/cm 2 illumination at 254 nm, the device achieved a responsivity of 26.59 mA/W, an external quantum efficiency of 12.98%, and a rise/decay time of 53 ms/7 ms without external bias. These results demonstrate outstanding detection performance compared to previously reported devices. The superior performance can be attributed to the better crystallinity which provides a larger absorption area for the device, the solution contact area, and a faster channel for carrier transport, the space charge region at the solid/liquid interface which also allows efficient separation of photogenerated carriers. Furthermore, it also benefits from the positive effects of moderate oxygen vacancy (V O ) concentrations for NRAs. The α-Ga 2 O 3 NRAs PEC-UV PD with two-step hydrothermal method is undoubtedly a promising candidate for future solar-blind detection.
ISSN:1572-817X
0306-8919
1572-817X
DOI:10.1007/s11082-024-07174-0