A 7.4% power conversion efficiency at air mass (AM) 1.5 full sunlight was reached with a mesoscopic solar cell employing a new binary ionic liquid electrolyte composed of 1-propyl-3-methylimidazolium iodide and 1-ethyl-3-methylimidazolium tricyanomethanide in conjunction with the amphiphilic ruthenium complex NaRu(4-carboxylic acid-4′-carboxylate)(4, 4′-dinonyl-2,2′-bipyridine)(NCS)2, coded as Z-907Na. Ultramicroelectrode voltammetric, nanosecond laser transient absorbance, and photovoltaic measurements show that a high iodide concentration is required for dye regeneration to compete efficiently with charge recombination. A surprisingly fast reductive quenching process is turned on in pure iodide melts. This channel is unproductive, explaining the lower photocurrents observed under these conditions. © 2005 American Chemical Society.
CITATION STYLE
Wang, P., Wenger, B., Humphry-Baker, R., Moser, J. E., Teuscher, J., Kantlehner, W., … Grätzel, M. (2005). Charge separation and efficient light energy conversion in sensitized mesoscopic solar cells based on binary ionic liquids. Journal of the American Chemical Society, 127(18), 6850–6856. https://doi.org/10.1021/ja042232u
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