| TiO2 nanotubes arrays/monolayer graphene film Schottky junction ultraviolet light photodetector |
Ming-Zheng Wang, Feng-Xia Liang, Biao Nie, Long-Hui Zeng, Ling-Xia Zheng, Peng Lv, Yong-Qiang Yu, Chao Xie, Yang Yang Li, Lin-Bao Luo*
Abstract:Schottky junctions made from a TiO22 nanotube (TiO2NT) array in contact with a monolayer graphene (MLG) film was fabricated and applied for ultraviolet (UV) light detection. The TiO2NT array was synthesized by anodization and the MLG through a simple chemical vapor deposition process.Photoconductive analysis showed that the fabricated Schottky junction photodetector (PD) is sensitive to UV light illumination with good stability and reproducibility. The corresponding responsivity (R), photoconductive gain (G) and detectivity (D*) were calculated to be 15 AW-1, 51, and 1.5×1012cm Hz½ W-1, respectively.It was also observed that the fabricated PD exhibits spectral sensitivity and a simple power-law dependence on light intensity.Moreover, the height of the Schottky junction diode was derived to be 0.59 V by using a low temperature I-V measurement. Finally, the working mechanism of the TiO2NT array/MLG film Schottky junction PD was elucidated.
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