Fabrication and Photovoltaic Properties of Dye-Sensitized Solar Cells Based on Graphene–TiO2 Composite Photoelectrode With ZnO Nanowires

In this paper, the photoelectrode of dye-sensitized solar cell (DSSC) was fabricated into a double-layer structure on the fluorine-doped tin oxide glass, which was synthesized by a graphene oxide-titanium dioxide composite layer (GO-TiO
₂
), and a zinc oxide nanowires (ZNWs) layer. The morphology and effects of double layer were investigated by the field emission scanning electron microscopy, UV-visible spectrometer, and solar simulator. The enhancement of the photovoltaic performances of DSSC could be attributed to the high specific surface area of GO and high electron mobility of zinc oxide. Besides, the equivalent circuit and electrochemical properties of GO-TiO
₂
/ZNWs double structure were also investigated by electrochemical impedance spectroscopy.