Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (11): 2339-2344.doi: 10.3866/PKU.WHXB201309031

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Facile Synthesis of Cu2SnSe3 as Counter Electrodes for Dye-Sensitized Solar Cells

ZHU Lei1,2, QIANG Ying-Huai1, ZHAO Yu-Long1, GU Xiu-Quan1, SONG Duan-Ming1, SONG Chang-Bin1   

  1. 1 School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China;
    2 School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China
  • Received:2013-05-15 Revised:2013-09-02 Published:2013-10-30
  • Contact: QIANG Ying-Huai E-mail:yhqiang@cumt.edu.cn
  • Supported by:

    The project was supported by the Fundamental Research Funds for the Central Universities, China (2592012184) and Fund of the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

Abstract:

Cu2SnSe3 (CTSe) nanoparticles with diameters of 150-250 nm were synthesized by a facile solvothermal method. The nanoparticles drop-casted onto fluorine dope tin oxide (FTO) substrate were used as counter electrode in dye-sensitized solar cells (DSSCs). The morphology, structure and composition of the CTSe nanoparticles were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and energy dispersive X-ray spectroscopy (EDS). The results indicated the formation of the nanoparticles with a single crystal phase and approximately stoichiometric composition. DSSCs fabricated with the CTSe-based counter electrodes exhibited a power conversion efficiency of 7.75%, which is similar to that of Ptbased devices (7.21%). The current-voltage curves of the DSSCs demonstrated that the thickness of the CTSe layer strongly influenced the photocurrent density and fill factor as a result of changes in the number of electrocatalytic sites and the resistance of the layers. Electrochemical impedance spectroscopy (EIS) measurements were performed and the results indicated that CTSe exhibited Pt-like electrocatalytic activity for the reduction of I3- to I- in DSSCs. This work presents a new approach for expanding the possibilities for developing low-cost DSSCs that do not require expensive and rare Pt counter electrodes.

Key words: Cu2SnSe3, Nanoparticle, Solvothermal, Counter electrode, Dye-sensitized solar cell

MSC2000: 

  • O649