Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (10): 2367-2372.doi: 10.3866/PKU.WHXB20111011

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Core-Shell Structure of Y2O3/TiO2 for Use in Dye Sensitized Solar Cells

LI Wen-Xin, HU Lin-Hua, DAI Song-Yuan   

  1. Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China
  • Received:2011-07-04 Revised:2011-08-03 Published:2011-09-27
  • Contact: DAI Song-Yuan E-mail:sydai@ipp.ac.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CBA00700), National High Technology Research and Development Program of China (863) (2009AA050603, 2011AA050527) and Funds of the Chinese Academy of Sciences for Key Topics in Innovation Engineering (KGCX2-YW-326).

Abstract: The deposition of a thin insulating layer around the TiO2 film to form a"core-shell"structure is a promising approach for the modification of electrodes. This is currently one of the focuses in the dye sensitized solar cell (DSC), which has received much attention for development of low-cost and simple assembly technology. In this paper, yttrium oxide (Y2O3), as a shell material, was coated onto the TiO2 film by a dipping method. The Y2O3/TiO2"core-shell"electrode was then used to fabricate the DSC. The composition and structure of the Y2O3/TiO2 film were measured. The effects of the Y2O3 layer on the flat-band potential, electron recombination, and the characteristics of DSC were investigated in detail. Results suggest that the flat-band potential of the film shifted negatively when TiO2 was coated with Y2O3 while electron recombination loss at the TiO2/electrolyte/dye interface was effectively reduced. As a result, the"core-shell"electrode provided a longer electron lifetime value compared with the uncoated TiO2 electrode and ultimately the open-circuit voltage increased dramatically. Studies show that the cell performance can be improved by the introduction of a proper amount of Y2O3 to the DSC.

Key words: Yttrium oxide, Electron recombination, Flat-band potential, Dye sensitized solar cell

MSC2000: 

  • O646