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Post-treatment of Nb2O5 compact layer in dye-sensitized solar cells for low-level lighting applications

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Abstract

Introduction of an ultrathin compact layer in dye-sensitized solar cells (DSSCs) can improve the cell efficiency under standard one sun illumination (> 100,000 lx). Herein, an ultrathin Nb2O5 layer is deposited on the TiO2-coated photoanode using a facial dip-coating method and its effects on the cell efficiency under a low level of light intensity (300–6000 lx) is studied. The results show that the ultrathin Nb2O5 layer helps the DSSCs to improve their power conversion efficiency (PCE) through different ways under standard one sun and low power illuminations. Under strong one sun illumination, the PCE of DSSC is improved by improving the short-circuit current density (JSC) which can be attributed to an increment of the surface area of photoanode for more dye adsorption and the blocking effect of Nb2O5. Under low power illumination, the introduction of Nb2O5 blocking layer improves the fill factor by effectively suppressing the charge recombination on the photoanode.

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Acknowledgements

This work was financially supported by the “Innovation and Development Center of Sustainable Agriculture” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. This work was also financially supported by the Ministry of Science and Technology (106-2119-M-005-001) in Taiwan.

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  1. Department of Chemical Engineering, National Chung Hsing University, Taichung, 402, Taiwan

    Kai-Wen Chen, Li-Syuan Chen & Chih-Ming Chen

  2. Innovation and Development Center of Sustainable Agriculture (IDCSA), National Chung Hsing University, Taichung, 402, Taiwan

    Chih-Ming Chen

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Chen, KW., Chen, LS. & Chen, CM. Post-treatment of Nb2O5 compact layer in dye-sensitized solar cells for low-level lighting applications. J Mater Sci: Mater Electron 30, 15105–15115 (2019). https://doi.org/10.1007/s10854-019-01883-z

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