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High-Performance Photoelectrochemical-Type Self-Powered UV Photodetector Using Epitaxial TiO2/SnO2 Branched Heterojunction Nanostructure

Authors

  • Xiaodong Li,

    Corresponding author
    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
    Current affiliation:
    1. These authors contributed equally to this work.
    • School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China.
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  • Caitian Gao,

    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Huigao Duan,

    1. Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410000, Hunan, PR China
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  • Bingan Lu,

    1. Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410000, Hunan, PR China
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  • Youqing Wang,

    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
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  • Lulu Chen,

    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
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  • Zhenxing Zhang,

    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
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  • Xiaojun Pan,

    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
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  • Erqing Xie

    Corresponding author
    1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China
    • School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China.
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Abstract

TiO2/SnO2 branched heterojunction nanostructure with TiO2 branches on electrospun SnO2 nanofiber (B-SnO2 NF) networks serves as a model architecture for efficient self-powered UV photodetector based on a photoelectrochemical cell (PECC). The nanostructure simultaneously offers a low degree of charge recombination and a direct pathway for electron transport. Without correcting 64.5% loss of incident photons through light absorption and scattering by the F-doped tin oxide (FTO) glass, the incident power conversion efficiency reaches 14.7% at 330 nm, more than twice as large as the nanocrystalline TiO2 (TiO2 NC, 6.4%)-film based PECC. By connecting a PECC to an ammeter, the intensity of UV light is quantified using the output short-circuit photocurrent density (Jsc) without a power source. Under UV irradiation, the self-powered UV photodetector exhibits a high responsivity of 0.6 A/W, a high on/off ratio of 4550, a rise time of 0.03 s and a decay time of 0.01 s for Jsc signal. The excellent performance of the B-SnO2 NF-based PECC type self-powered photodetector will enable significant advancements for next-generation photodetection and photosensing applications.

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