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Potassium-Doped Zinc Oxide as Photocathode Material in Dye-Sensitized Solar Cells

Authors

  • Jie Bai,

    1. Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-2225
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    • These authors contributed equally to this work.

  • Xiaobao Xu,

    1. Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-2225
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    • These authors contributed equally to this work.

  • Dr. Ling Xu,

    1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-3013
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  • Jin Cui,

    1. Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-2225
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  • Dekang Huang,

    1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-3013
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  • Prof. Wei Chen,

    1. Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-2225
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  • Prof. Yibing Cheng,

    1. Department of Materials Engineering, Monash University, Melbourne, VIC 3800 (Australia)
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  • Prof. Yan Shen,

    Corresponding author
    1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-3013
    • Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-3013
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  • Prof. Mingkui Wang

    Corresponding author
    1. Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-2225
    • Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (PR China), Fax: (+86) 27-8779-2225
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Abstract

ZnO nanoparticles are doped with K and applied in p-type dye-sensitized solar cells (DSCs). The microstructure and dynamics of hole transportation and recombination are investigated. The morphology of the K-doped ZnO nanoparticles shows a homogeneous distribution with sizes in the range 30–40 nm. When applied in p-type DSCs in combination with C343 as sensitizer, the K-doped ZnO nanoparticles achieve a photovoltaic power conversion efficiency of 0.012 % at full-intensity sunlight. A further study on the device by transient photovoltage/photocurrent decay measurements shows that the K-doped ZnO nanoparticles have an appreciable hole diffusion coefficient (ca. 10−6 cm2 s−1). Compared to the widely used p-type NiO nanoparticles, this advantage is crucial for further improving the efficiency of p-type DSCs.

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