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Keywords:

  • dyes/pigments;
  • impedance spectroscopy;
  • ionic liquids;
  • sensitizers;
  • solar cells
Thumbnail image of graphical abstract

A power conversion efficiency of more than 7.2 % under AM 1.5 sunlight (100 mW cm−2) is reported for the first time for an organic-dye-sensitized solar cell used in conjunction with a newly developed binary ionic-liquid (solvent-free) electrolyte (see current–voltage plot and photocurrent action spectrum for the sensitizer D205, the highest occupied molecular orbital of which is shown).