▎ 摘　　要

In order to optimize the working electrode for dye-sensitized solar cells (DSSCs), three kinds of stacked-film structures with the same overall thickness of 13 mu m were prepared by using spray coating system, including pure TiO2 film, TiO2-Graphene (TG) film and TiO2/TG (TTG) bilayer film. To increase light path and excite more dye molecules, the bilayer structure of TTG film is composed with TiO2 main layer and TG scattering layer, which provide pores to adsorb N719 dye molecules. The DSSCs with pure TiO2, TG, and TTG working electrodes exhibit the efficiencies of 3.07%, 2.48%, and 4.49%, respectively. From the results, the DSSCs with TG film working electrode had the lowest efficiency, because the TG film had the defects which led to higher interfacial charges than the pure TiO2. Moreover, TTG working electrode contained a TiO2 main layer and a TG scattering layer in which the graphene material could increase the electron transport and reduce the recombination, and it was also due to the stacked structure, which could improve the light utilization and enhance the light transmitting distance. In this article, the working electrode of DSSCs was successfully modified by using TTG stacked structure with an improved efficiency of 46.25% higher than that of TiO2 working electrode.