Back to Search
Start Over
Solar-blind UV photodetectors based on α-Ga2O3 prepared by a two-step hydrothermal method.
- Source :
-
Optical & Quantum Electronics . Jul2024, Vol. 56 Issue 7, p1-14. 14p. - Publication Year :
- 2024
-
Abstract
- In this study, α-Ga2O3 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-Ga2O3 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/cm2 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 (VO) concentrations for NRAs. The α-Ga2O3 NRAs PEC-UV PD with two-step hydrothermal method is undoubtedly a promising candidate for future solar-blind detection. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTODETECTORS
*QUANTUM efficiency
*SPACE charge
*NANORODS
Subjects
Details
- Language :
- English
- ISSN :
- 03068919
- Volume :
- 56
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Optical & Quantum Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 178151342
- Full Text :
- https://doi.org/10.1007/s11082-024-07174-0