| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5354375 | Applied Surface Science | 2015 | 5 Pages |
Abstract
The authors report on high quality TiO2 epilayers grown on lattice-matched LaAlO3 substrates by pulsed laser deposition. A prototype of metal-semiconductor-metal ultraviolet (UV) photodetector based on TiO2 was fabricated by employing Au as the Schottky contact metal. The UV-visible transmittance spectrum of the TiO2 epilayer and the spectral response of the photodetector reveal that the deposited anatase TiO2 thin film exhibits excellent visible-blind UV characteristics with an optical bandgap of 3.25Â eV. In addition, the fabricated photodetector exhibits a high UV-to-visible rejection ratio (R270Â nm/R400Â nm) of 105 while displaying a low dark current of 0.25Â pA under 5Â V bias and a high responsivity of 0.21Â A/W, suggesting a potential application in UV photodetection.
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Authors
Zifeng Zhang, Lai Mun Wong, Zhiwei Zhang, Zhengyun Wu, Shijie Wang, Dongzhi Chi, Rongdun Hong, Weifeng Yang,