Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Influence of Lithium Ions on the Ion-coordinating Ruthenium Sensitizers for Nanocrystalline Dye-sensitized Solar Cells

  • Cho, Na-Ra (Department of Advanced Material Chemistry, Korea University) ;
  • Lee, Chi-Woo (Department of Advanced Material Chemistry, Korea University) ;
  • Cho, Dae-Won (Department of Advanced Material Chemistry, Korea University) ;
  • Kang, Sang-Ook (Department of Advanced Material Chemistry, Korea University) ;
  • Ko, Jae-Jung (Department of Advanced Material Chemistry, Korea University) ;
  • Nazeeruddin, Mohammad K. (Laboratory for Photonics and Interfaces, Swiss Federal Institute of Technology)
  • Received : 2011.01.05
  • Accepted : 2011.05.30
  • Published : 2011.08.20
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Abstract

Ion-coordinating ruthenium complexes [cis-Ru(dcbpy)(L)(NCS)$_2$, where dcbpy is 4,4'-dicarboxylic acid-2,2'-bipyridine and L is 1,4,7,10-tetraoxa-13-azacyclopentadecane, JK-121, or bis(2-(2-methoxy-ethoxy)ethyl) amine, JK-122] have been synthesized and characterized using $^1H$ NMR, Fourier transform IR, UV/vis spectroscopy, and cyclic voltammetry. The effect of $Li^+$ in the electrolyte on the photovoltaic performance was investigated. With the stepwise addition of $Li^+$ to a liquid electrolyte, the device shows significant increase in the photo-current density, but a small decrease in the open circuit voltage. The solar cell with a hole conductor, the addition of $Li^+$ resulted in a 30% improvement in efficiency. The JK-121 sensitized cells in the liquid and solid-state electrolyte give power conversion efficiencies of 6.95% and 2.59%, respectively, under the simulated sunlight.

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