Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (6): 590-598.DOI: 10.15541/jim20180406

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Nb2O5 Coating on the Performance of Flexible Dye Sensitized Solar Cell Based on TiO2 Nanoarrays/Upconversion Luminescence Composite Structure

Xi-Qing LÜ,Huan-Yu ZHANG,Rui LI,Mei ZHANG,Min GUO()   

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2018-09-06 Revised:2018-11-13 Published:2019-06-20 Online:2019-05-23
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  • Supported by:
    National Natural Science Foundation of China(51572020);National Natural Science Foundation of China(51772023);National Program on Key Basic Research Project(2014CB643401)


By using hydrothermal and spin-coating method, Ti mesh supported composite structure, TiO2 nanowire arrays/Yb-Er-F doped TiO2 upconversion luminescence nanoparticles (TNWAs/YEF-TiO2-UCNPs), was synthesized and assembled into flexible dye-sensitized solar cell (DSSC). The effect of YEF-TiO2-UCNPs optical property on the power conversion efficiency (PCE) of this device was studied. In addition, the influence of NbCl5 solution coating on morphology and performance of flexible DSSC was also investigated in detail. It is shown that the YEF-TiO2- UCNPs could expand the range of incident light utilization, in the meantime, however, increase the electron recombination in photoanode. Nb2O5 coating layer served as an energy barrier at the semiconductor/electrolyte interface, increased the composite resistance Rrec to inhibit electron recombination, improved the electron collection efficiency ηec and photogenerated electron lifetime τe, then elevated the short circuit current and the open circuit voltage, finally enhanced the performance of DSSC. The Nb2O5@TNWAs/YEF-TiO2-UCNPs composite structured DSSC achieved the best PCE of 6.89% with 20 mmol/L NbCl5 ethanol solution coating, increased 24.3% compared with the uncoated blank device.

Key words: Nb2O5 coating, Yb-Er-F doped TiO2, upconversion luminescence nanoparticle, composite structure, flexible dye sensitized solar cells

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