**4. Conclusion**

In this chapter, the use of graphene as a supporting material for electrodes in DSSCs was discussed. Graphene-based DSSCs have emerged as an important class of photovoltaic material for many recent years. Graphene could be synthesized by a chemical reduction method and called rGO. This chapter demonstrates that graphene (or rGO) is the prospective material for the synthesis of composite materials, including Pt/rGO and ZnO/rGO, which were applied for the fabrication of cathodes and anodes in DSSCs. Graphene has shown great potential to replace Pt as cathodes for fabricating DSSCs. The mentioned experiments of PG20 demonstrated that Pt nanoparticles supported on rGO could help to reduce the amount of Pt in cathodes of DSSCs, while the high efficiencies were maintained. For anodes, the incorporation of rGO in ZnO/rGO composites enhanced the efficiencies of DSSCs, by reducing the electron recombination processes in the structure of anodes in DSSCs.

Based on the reported results, it is clear that graphene materials will have wide and promising applications in DSSCs. Various graphene-based materials with distinct properties should be extensively studied before they are practically applied for producing DSSCs.
