Charge separation and efficient light energy conversion in sensitized mesoscopic solar cells based on binary ionic liquids.

  • Wang P
  • Wenger B
  • Humphry-Baker R
 et al. 
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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.

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  • Peng Wang

  • Bernard Wenger

  • Robin Humphry-Baker

  • Jacques-E Moser

  • Joël Teuscher

  • Willi Kantlehner

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