Abstract
A new type of TiO2 photoanode containing upconversion luminescence materials Y2O3:Er3+ nanorods is developed, which is effective to enhance the photoelectric conversion efficiency of dye-sensitized solar cell. The Y2O3:Er3+ nanorods are synthesized using a hydrothermal process and the photoandodes are prepared via coating the TiO2 (P25) and Y2O3:Er3+ mixture with various Y2O3:Er3+ concentrations on the fluorine doped tin oxide (FTO) substrates. We show that the TiO2 photoanode with an Y2O3:Er3+ concentration of 4% exhibits the highest photoelectric conversion efficiency (7.80%), which is 43.6% higher than that of the pure P25 photoanode (5.43%). This great enhancement is attributed to the additional, useful photons converted from infrared (IR) photons in sun light by the doped Y2O3:Er3+ upconversion nanorods. In addition, the electrochemical impedance spectroscopy (EIS) analysis demonstrates that the doping of Y2O3:Er3+ improves the charge transfer and electron lifetime of the dye-sensitized solar cell.
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