The mechanism of iodine reduction by TiO 2 electrons and the kinetics of recombination in dye-sensitized solar cells

Caryl E. Richards, Assaf Y. Anderson, Stefano Martiniani, Chunhung Law, Brian C. O'Regan

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Electron transfer from TiO 2 to iodine/iodide electrolytes proceeds via reduction of either I 3 - or uncomplexed I 2 (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I 3 - concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I 3 - concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.

Original languageEnglish (US)
Pages (from-to)1980-1984
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number15
DOIs
StatePublished - Aug 2 2012
Externally publishedYes

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