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 E-mail:solar@ipp.ac.cn; sydai@ipp.ac.cn
  • 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).

Abstract:

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

MSC2000: 

  • O646