Zinc-Doping in TiO2 Films to Enhance Photovoltaic Performance of Dye-Sensitized Solar Cells
Dye-sensitized solar cells based on Zn-doped TiO2 thin film prepared by the hydrothermal method show a photovoltaic efficiency of 7.68%, which is higher than that of the undoped TiO2 thin film (6.16%). The Zn-doped films exhibit an elevated electron Fermi level,which may enhance band bending to lower the density of empty trap states.Because of this Zn-doping,the consequent Dsscs can alleviate the decay of light to electric energy conversion efficiency due to light intensity reduction. Intensity-modulated photocurrent spectroscopic analysis reveals that enhanced transport of photogenerated electrons as a result of the trap density minimization is responsible for the high photovoltaic performance.
Q. P. Liu et al., "Zinc-Doping in TiO2 Films to Enhance Photovoltaic Performance of Dye-Sensitized Solar Cells", Applied Mechanics and Materials, Vols. 66-68, pp. 224-228, 2011