Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 82-88.doi: 10.3866/PKU.WHXB201211071

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

A Simple Template Synthesis of Hierarchically Mesoporous TiO2 Microsphere for Dye-Sensitized Solar Cells

GUO Wei1, WANG Kai1, SHEN Yi-Hua1, ZHANG He2, WENG Tao2, MA Ting-Li1,2   

  1. 1 State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China;
    2 Yingkou Opvtech New Energy Co. Ltd, Yingkou 115003, Liaoning Province, P. R. China
  • Received:2012-09-03 Revised:2012-11-07 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51273032).

Abstract:

Mesoporous TiO2 microspheres were synthesized using a simple template method. The effect of the alkyl chain length on the synthesis and properties of the TiO2 microspheres was studied. A high power conversion efficiency (9.5%-10.1%) was attained by the dye-sensitized solar cells (DSCs) fabricated with the hierarchically mesoporous TiO2 microsphere films. The physical properties of the TiO2 microspheres were analyzed by X-ray diffraction (XRD), N2 physisorption (BET), and scanning electron microscopy (SEM). The results indicated the TiO2microsphere crystal structure to be in the pure anatase phase; the rough surface microstructure of the TiO2 microspheres, formed through accumulation of nanocrystalline (14-18 nm diameter) TiO2 particles, provides a proper large surface area and mesoporous structure. The hierarchically mesoporous TiO2 microspheres can form good paths for mass transport, and also act as light scattering layers for efficient light harvesting. Meanwhile, the rough TiO2 microsphere surface ensures a sufficient amount of dye uptake, and consequently improves the photo-generated electron density. Electrochemical impedance analysis demonstrated the advantage of using microspheres for mass transport in electrolytes.

Key words: Dye-sensitized solar cell, Photoelectrode, TiO2 sphere, Nanostructure, Photoelectric conversion

MSC2000: 

  • O649