Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Dynamic Response of Charge Transfer and Recombination at Various Electrodes in Dye-sensitized Solar Cells Investigated Using Intensity Modulated Photocurrent and Photovoltage Spectroscopy

  • Received : 2011.11.04
  • Accepted : 2011.12.02
  • Published : 2012.02.20
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Abstract

Intensity modulated photocurrent spectroscopy and intensity modulated photovoltage spectroscopy were investigated to measure the dynamic response of charge transfer and recombination in the standard, $TiCl_4$-treated and the combined scattering layer electrode dye-sensitized solar cells (DSSCs). IMPS and IMVS provided transit time ($\tau_n$), lifetime ($\tau_r$), diffusion coefficient ($D_n$) and effective diffusion length ($L_n$). These expressions are derived that generation, collection, and recombination of electrons in a thin layer nanocrystalline DSSC under conditions of steady illumination and with a superimposed small amplitude modulation. In this experimental, IMPS/IMVS showed that the main effect of $TiCl_4$ treatment is to suppress the recombination of photogenerated electrons, thereby extending their lifetime. And the Diffusion coefficient of combined scattering layer electrode is $6.10{\times}10^{-6}$ higher than that of the others, resulting in longer diffusion length.

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References

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