One-pot Synthesis of CZTS/RGO Composite Material and its Electro-Catalytic Performance towards Triiodide Reduction in Dye-Sensitized Solar Cells

摘要

The composite material of quaternary kesterite type Cu2ZnSnS4 and reduced graphene oxide(CZTS/RGO)was successfully synthesized by a one-pot hydrothermal synthesis method.When applied as counter electrode materials for dye-sensitized solar cells,it shows better electro-catalytic performance towards reduction of triiodide.The DSSCs based on CZTS/RGO counter electrode shows a maximum solar-to-electrical power efficiency of 3.08%,which is much higher than that of pure CZTS counter electrode(1.41%)and pure RGO counter electrode(1.55%)prepared under the same conditions.The weight percent of GO to CZTS raw material used to synthesize CZTS/RGO is an important factors to affect the photovoltaic performance of DSSCs based on CZTS/RGO counter electrode.It is believed that as-synthesized CZTS/RGO can potentially be used as alternative counter electrode materials to replace the expensive Pt counter electrode,and this one-pot synthetic method will be helpful for exploring facile synthetic route of low-cost and efficient CZTS based composite counter electrode materials.