Enhanced efficiency in dye sensitized solar cells using reduced graphene oxide-TiO$_{2}$ nanocomposites

Graphene, in the last few years, has elicited considerable interest for its remarkable electronic and optical properties. It has possible applications in the fabrication of organic solar cells, single molecule sensing and field effect transistors. Here, we, report the synthesis of graphene oxide starting from graphite nanoplatelets using Hammer's method. Subsequently, graphene oxide was reduced by hydrazine to obtain chemically reduced graphene oxide. The reduced graphene oxide-TiO$_{2}$ nanocomposites were prepared by physically mixing Triton-X stabilized reduced graphene aqueous dispersion and TiO$_{2 }$(P25) nanoparticles. Dye-sensitized solar cells (DSSC) were fabricated. It was observed that incorporation of 1wt{\%} graphene into TiO$_{2}$ leads to 16{\%} enhancement of overall power conversion efficiency.