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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

Influence of Lithium Ions on the Ion-Coordinating Ruthenium Sensitizers for Nanocrystalline Dye-Sensitized Solar Cells
Nara Cho, Chi-Woo Lee, Dae Won Cho, Sang Ook Kang, Jaejung Ko*, Mohammad K. Nazeeruddin
Dye, Dye-sensitized solar cell, Ruthenium sensitizer, Lithium cation coordination
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.
3031 - 3038
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