Tandem dye-sensitized solar cell for improved power conversion efficiencies

Abstract

The power conversion efficiency of dye-sensitized solar cells crucially depends on the ability of the sensitizer to absorb light in a broad range of the solar spectrum. In order to increase this range of absorption, a tandem structure with two different sensitizer dyes in two different compartments of the cell, respectively, was realized. Overall power conversion efficiencies as high as η=10.5% and short circuit current densities of $J_{\mathrm{SC}}\text{=21.1\hspace{0.5em}}{\mathrm{mA/cm}}^2$ were achieved under air mass 1.5 illumination with red dye and black dye in the upper and lower compartment of the cell, respectively.