Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Ionic Liquids with Different Cations in I-/I3- Redox Electrolyte on the Performance of Dye-sensitized Solar Cells

  • Cho, Tae-Yeon (Photovoltaic Research Center, Korea Institute of Energy Research) ;
  • Yoon, Soon-Gil (Department of Material Science and Engineering, Chung-Nam National University) ;
  • Sekhon, S.S. (Department of Physics, Guru Nanak Dev University) ;
  • Han, Chi-Hwan (Photovoltaic Research Center, Korea Institute of Energy Research)
  • Received : 2011.03.24
  • Accepted : 2011.04.21
  • Published : 2011.06.20
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Abstract

The effect of the addition of ionic liquids with four different cations (imidazolium, pyrrolidinium, piperidinium and pyridinium) on the performance of dye-sensitized $TiO_2$ solar cells based on electrolytes containing a t-butylpyridine (TBP) in 3-methoxypropionitrile (MPN) was studied. A total of 18 ionic liquids with mono-, di- and tri-alkyl derivatives were used in the present study, and among them a pyridinium cation with a mono-alkyl group showed better cell efficiency than the others. The best photoelectric conversion efficiency, 7.213%, was obtained using 1-hexylpyridinium iodide with an open-circuit photovoltage ($V_{oc}$) = 0.731 V, a short-circuit photocurrent density ($J_{sc}$) = 16.175 $mA/cm^2$, and a fill factor (ff) = 0.610 under AM1.5 and 100 $mW/cm^2$ illumination.

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