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

doi:10.1021/jz3006755

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

63 Citations (Scopus)

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 language	English
Pages (from-to)	1980-1984
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	3
Issue number	15
Early online date	10 Jul 2012
DOIs	https://doi.org/10.1021/jz3006755
Publication status	Published - 02 Aug 2012

Keywords

dye-sensitized solar cells
redox electrolyte
recombination

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AU - Law, C.

AU - O'Regan, B. C.

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N2 - 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.

AB - 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.

KW - dye-sensitized solar cells

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KW - recombination

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

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