TiO2 Nanotube Array/Monolayer Graphene Film Schottky Junction Ultraviolet Light Photodetectors

Authors

  • Ming-Zheng Wang,

    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, P. R. China
    2. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong SAR, P. R. China
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  • Feng-Xia Liang,

    Corresponding author
    1. School of Materials Science and Engineering, Hefei University of Technology, Hefei Anhui, P. R. China
    • School of Electronic Science and Applied Physics and Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei Anhui, P. R. China
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  • Biao Nie,

    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, P. R. China
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  • Long-Hui Zeng,

    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, P. R. China
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  • Ling-Xia Zheng,

    1. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong SAR, P. R. China
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  • Peng Lv,

    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, P. R. China
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  • Yong-Qiang Yu,

    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, P. R. China
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  • Chao Xie,

    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, P. R. China
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  • Yang Yang Li,

    Corresponding author
    1. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong SAR, P. R. China
    • School of Electronic Science and Applied Physics and Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei Anhui, P. R. China
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  • Lin-Bao Luo

    Corresponding author
    • School of Electronic Science and Applied Physics and Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei Anhui, P. R. China
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E-mail: fxliang@hfut.edu.cn, yangli@cityu.edu.hk, luolb@hfut.edu.cn

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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