TiO2 Nanotube Array/Monolayer Graphene Film Schottky Junction Ultraviolet Light Photodetectors |
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| Authors: | 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 |
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| Institution: | 1. School of Electronic Science and Applied Physics and Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, , Hefei Anhui, 230009 P. R. China;2. Department of Physics and Materials Science, City University of Hong Kong, , Kowloon, Hong Kong SAR, P. R. China;3. School of Materials Science and Engineering, Hefei University of Technology, , Hefei Anhui, 230009 P. R. China |
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| Abstract: | Schottky junctions made from a titanium dioxide nanotube (TiO2NT) array in contact with a monolayer graphene (MLG) film are fabricated and utilized for UV light detection. The TiO2NT array is synthesized by the anodization and the MLG through a simple chemical vapor deposition process. Photoconductive analysis shows 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*) are calculated to be 15 A W?1, 51, and 1.5 × 1012 cm Hz1/2 W?1, respectively. It is 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 is 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 is elucidated. |
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