Preparation of TiO2/Single Layer Grapgene Composite Photoanodes for Dye-Sensitized Solar Cells

Abstract

Dye-sensitized solar cells (DSSCs) are low-cost, simple process and promising solar cells. Single Layer Graphene(G) have good electrical conductivity, mechanical and thermal stability, and can be used as the photoanode material for DSSCs. In this study, the DSSCs were fabricated byTiO2/G composites, and compared with the properties of DSSCs which fabricated by different concentrations of Single Layer Graphene. Then the Single Layer Graphene were dispersed and fabricated into the DSSCs, compared with the DSSCs which fabricated by undispersed Single Layer Graphene. Finally, theTiO2 film and theTiO2/G film were mixed coating, and analyzed the effect of different coating sequences on DSSCs. The results indicate that Single Layer Graphene can provide a direct transmission pathway for electrons, which can enhance the transmission speed of electron and reduce the electron/hole recombination. The DSSCs fabricated by theTiO2 film and theTiO2/G film had the highest efficiency 3.6%. The DSSCs prepared by mixing theTiO2/G film with theTiO2 film can slightly improve the efficiency of the dye-sensitized battery. Compared with the DSSCs prepared fromTiO2 film, the efficiency increases slightly and the efficiency is 3.36%.