Short-circuit current density behavior of dye-sensitized solar cells

Short-circuit cur-rent densities (J(sc)s) were measured on two kinds of dye-sensitized solar cells (DSCs). The dependences of J(sc) on the diffusion coefficient Of I(3)(-) and the cell gap are discussed using relevant model equations for the DSC. In the lower diffusion coefficient region, the DSC operates under an I(3)(-) diffusion-limiting condition and, under this condition, narrowing the cell gap is a simple and effective way to increase the J(sc). The J(sc) of a gel-type polymeric-electrolyte-based DSC with a cell gap of 20 mu m is verified to be equal to that of a liquid electrolyte-based DSC.