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17 October 2007 Hybrid ionic liquid and polymer electrolytes for nanocrystalline dye-sensitized TiO2 solar cells
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Alternative electrolytes for application in dye-sensitized TiO2 solar cells were investigated. The electrolytes were prepared with NaI and I2 as redox couple in a matrix consisting of poly(ethylene oxide-co-diethyleneglycolglicidyl methylether) and/or the ionic liquid N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide. Cyclic Voltammetry and Electrochemical Impedance Spectroscopy revealed that, increasing the relative amount of ionic liquid in the electrolytes, the impedance decreased and the ionic conductivity and the reversibility for the redox pair increased. For solar cells assembled with the polymer electrolytes, the efficiency for energy conversion decreased with light intensity, ranging from 3.2 to 1.4 % under 10 to 100 mW cm-2. Using the ionic liquid electrolyte, the efficiency was ca. 1.8 %, independent of irradiation. For hybrid electrolytes, the best performance, considering mechanical stability and electrochemical properties, was achieved for an electrolyte consisting of 2:1 relative amount of polymer and ionic liquid. Solar cells assembled with this hybrid electrolyte presented, under 100 mW cm-2, short-circuit current of 4.1 mA cm-2 and 1.4 % for overall efficiency (ca. 3.0 % under 10 mW cm-2).
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Ana Carolina Fadel Dalsin, Ana Flávia Nogueira, Marco-Aurélio De Paoli, Stefano Passerini, Wesley A. Henderson, and Claudia Longo "Hybrid ionic liquid and polymer electrolytes for nanocrystalline dye-sensitized TiO2 solar cells", Proc. SPIE 6656, Organic Photovoltaics VIII, 66561F (17 October 2007);


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