The Mechanism of Iodine Reduction by TiO2 Electrons and the Kinetics of Recombination in Dye-Sensitized Solar Cells

C.E. Richards, A. Y. Anderson, S. Martiniani, C. Law, B. C. O'Regan

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62 Citations (SciVal)

Abstract

Electron transfer from TiO to iodine/iodide electrolytes proceeds via reduction of either I or uncomplexed I (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.
Original languageEnglish
Pages (from-to)1980-1984
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number15
Early online date10 Jul 2012
DOIs
Publication statusPublished - 02 Aug 2012

Keywords

  • dye-sensitized solar cells
  • redox electrolyte
  • recombination

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