Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (1): 121-127.doi: 10.3866/PKU.WHXB201411032

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Quasi-Solid-State Dye-Sensitized Solar Cell Fabricated fromIonic Gel Electrolyte with High Gel-to-Solution Transition Temperature

TAO Li1, HUO Zhi-Peng1, WANG Lu1, DAI Song-Yuan1,2   

  1. 1. Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China;
    2. Beijing Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University, Beijing 102206, P. R. China
  • Received:2014-09-04 Revised:2014-10-31 Published:2014-12-25
  • Contact: HUO Zhi-Peng, DAI Song-Yuan E-mail:zhipenghuo@163.com;sydai@ipp.ac.cn
  • Supported by:

    The project was supported by the National Key Basic Research Programof China (973) (2011CBA00700), National High Technology Research and Development Programof China (863) (2011AA050510), and National Natural Science Foundation of China (21103197, 21173227, 21273242).

Abstract:

Dye-sensitized solar cells (DSCs) have aroused much interest because of their low cost and comparatively high power conversion efficiency. Stability is paramount for any photovoltaic technology. Traditional liquid electrolytes tend to leak and evaporate, which limits the long-termperformance of the DSC. N,N'-1,5-Pentanediylbis-dodecanamide was synthesized and used as a low molecular mass organogelator (LMOG), to gelate an ionic liquid electrolyte (ILE) and fabricate a quasi-solid-state DSC(QS-DSC). Differential scanning calorimetry indicated that the gel-to-solution transition temperature of the ionic gel electrolyte (IGE) was 104.7℃, which indicated good intrinsic stability. Electron transport and recombination were investigated by cyclic voltammetric (CV) and electrochemical impedance measurements, and intensity-modulated photocurrent and photovoltage spectroscopy (IMPS and IMVS) measurements. Electron recombination at the TiO2 photoanode/ electrolyte interface was accelerated by the cross-linked gel network. The shorter electron recombination lifetime decreased the photoelectric conversion efficiency of the QS-DSC, compared with the ILE-based DSC. The photoelectric conversion efficiency of the QS-DSC exhibited no change during accelerated aging test for 1000 h, while that of the ILE-based DSC decreased to 86% of its initial value.

Key words: Dye-sensitized solar cell, Quasi-solid-state, Electrolyte, Lowmolecular mass organogelator, N,N'-1,5-pentanediylbis-dodecanamide

MSC2000: 

  • O646