Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (04): 881-886.doi: 10.3866/PKU.WHXB20110413

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

TiO2 Thin-Film Electrode Modified by Co-Adsorbents

LI Jie, KONG Fan-Tai, WU Guo-Hua, ZHANG Chang-Neng, 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:2010-12-03 Revised:2011-02-15 Published:2011-03-29
  • Contact: KONG Fan-Tai,DAI Song-Yuan;
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (2011CBA00700), National Natural Science Foundation of China (21003130) and Natural Science Foundation of Anhui Province, China (090414174).


A co-adsorbents modified nanocrystalline TiO2 thin-film electrode was studied for application in dye-sensitized solar cells. The effects of di(3,3-dimethylbutyl) phosphoric acid and chenodeoxycholic acid modification on the flat band potential and the passivation of the TiO2 thin-film electrode were investigated by determining the flat-band potential and undertaking electrochemical impedance spectroscopy (EIS). The results suggest that di(3,3-dimethylbutyl) phosphoric acid is more effective in passivating the TiO2 film surface and in shifting the flat-band potential negatively. For the dye-sensitized solar cells, EIS measurements indicate that the use of di(3,3-dimethylbutyl) phosphoric acid as a co-adsorbent may be more effective in increasing the electronic lifetime and the open-circuit voltage of the device than chenodeoxycholic acid.

Key words: Dye-sensitized solar cell, Coadsorbent, Dark current, Flat-band potential, Electrochemical impedance spectroscopy


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