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Effect of TiO2 particle size on the properties of electron transport and back-reaction in dye-sensitized solar cells

Liang Lin-Yun Dai Song-Yuan Hu Lin-Hua Dai Jun Liu Wei-Qing

Effect of TiO2 particle size on the properties of electron transport and back-reaction in dye-sensitized solar cells

Liang Lin-Yun, Dai Song-Yuan, Hu Lin-Hua, Dai Jun, Liu Wei-Qing
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  • Received Date:  17 October 2007
  • Accepted Date:  11 July 2008
  • Published Online:  20 February 2009

Effect of TiO2 particle size on the properties of electron transport and back-reaction in dye-sensitized solar cells

  • 1. 中国科学院等离子体物理研究所太阳能材料与工程研究室,合肥 230031

Abstract: The mechanisms of electron transport and back-reaction kinetics in dye-sensitized solar cell (DSC) were investigated by intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS). The DSCS with three different sizes of TiO2 particles were measured by IMPS/IMVS. The results indicate that the effective diffusion coefficient (Dn) increases along with the increase of particle size, while the electron lifetime (τn) and the electron transit time (τd) decrease with the increase of particle size under different induced-light intensities. The increase of Dn is attributive to the decrease of the film surface area. The decrease of τn is interpreted according to the frequency of electron trapping and de-trapping in defects. The decrease of trap concentration in TiO2 films leads to the decrease of τd.

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