Application of the tris(acetylacetonato)iron(III)/(II) redox couple in p-type dye-sensitized solar cells

Ishanie Rangeeka Perera Hetti Arachchige, Torben Jost Daeneke, Satoshi Makuta, Ze Yu, Yasuhiro Tachibana, Amaresh Mishra, Peter Bauerle, Christian Andre Ohlin, Udo Bach, Leone Spiccia

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An electrolyte based on the tris(acetylacetonato)iron(III)/(II) redox couple ([Fe(acac)3]0/1-) was developed for p-type dye-sensitized solar cells (DSSCs). Introduction of a NiO blocking layer on the working electrode and the use of chenodeoxycholic acid in the electrolyte enhanced device performance by improving the photocurrent. Devices containing [Fe(acac)3]0/1- and a perylene-thiophene-triphenylamine sensitizer (PMI-6T-TPA) have the highest reported short-circuit current (JSC=7.65 mA cm-2), and energy conversion efficiency (2.51 %) for p-type DSSCs coupled with a fill factor of 0.51 and an open-circuit voltage VOC=645 mV. Measurement of the kinetics of dye regeneration by the redox mediator revealed that the process is diffusion limited as the dye-regeneration rate constant (1.7×108 M-1 s-1) is very close to the maximum theoretical rate constant of 3.3×108 M-1 s-1. Consequently, a very high dye-regeneration yield (>99 %) could be calculated for these devices.

Original languageEnglish
Pages (from-to)3758-3762
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number12
Publication statusPublished - 16 Mar 2015


  • dye-sensitized solar cells
  • energy conversion
  • iron
  • redox chemistry
  • semiconductors

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