Different Concentrations of Carbon Nanotubes/Graphene and TiO2 Composite Photoanodes for Dye-sensitized Solar Cells

Abstract

Dye-sensitized solar cells have the advantages of low material cost, easy process, and simple process equipment as one of the future green energy developments. As graphene has good electrical conductivity, thermal conductivity, high light transmittance, and low resistance, it is chosen as a photoanode material. Carbon nanotubes have high conductivity, high chemical stability, and excellent mechanical strength, and are suitable for dye-sensitized solar cells. In this study, by adding different concentrations of single-layer graphene and multi-layer carbon nanotubes to titanium dioxide, the effects of graphene and carbon nanotubes on the dye-sensitive battery under different concentrations were investigated. Doping graphene and carbon nanotube dye-sensitive cells in titanium dioxide is measured and compared with the dye-sensitive cells of graphene, carbon nanotubes, and carbon nanotubes/ graphene to analyze the three different processes. Dye-sensitive battery characteristics. The results of the study show that the carbon nanotube/graphene dye-sensitive battery at the same time, compared with the thin film coating doped only with carbon nanotubes and graphene. The surface of the working electrode is rough, which increases the light absorption rate. The increase in surface pores has increased the dye absorption, and the overall light conversion efficiency of the battery has been significantly improved.