N, N'-Bis(furfurylidene) ethylenediamine zinc (II) iodide (ZnLI2) was synthesized and characterized with elemental analysis, Uv-vis and IR spectroscopies. The new Schiff base complex was applied as an electrolyte additive of dye sensitized solar cells. ZnLI2 has higher conductivities, resulting in larger IPCE and photoelectric conversion efficiency of DSSCs. The best results were obtained with the optimized composite electrolyte ZnLI2 and the photoelectric conversion efficiency...