Electrochemical reaction rates in a dye-sensitised solar cell - The iodide/tri-iodide redox system

Lasse Bay, Keld West*, Bjorn Winther Jensen, Torben Jacobsen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

146 Citations (Scopus)


The electrochemical reaction rate of the redox couple iodide/tri-iodide in acetonitrile is characterised by impedance spectroscopy. Different electrode materials relevant for the function of dye-sensitised solar cells (DSSC) are investigated. Preferably, the reaction with the iodide/tri-iodide couple should be fast at the counter electrode, i.e. this electrode must have a high catalytic activity towards the redox couple, and the same reaction must be slow on the photo electrode. The catalytic activity is investigated for platinum, poly(3,4-ethylenedioxythiophene) (PEDOT), polypyrrole (PPy), and polyaniline (PANI) - all deposited onto fluorine-doped tin oxide (FTO) glass. Both Pt and PEDOT are found to have sufficiently high catalytic activities for practical use as counter electrodes in DSSC. The reaction resistance on FTO and anatase confirmed the beneficial effect of a compact anatase layer on top of the FTO glass in lowering the tri-iodide reduction rate.

Original languageEnglish
Pages (from-to)341-351
Number of pages11
JournalSolar Energy Materials and Solar Cells
Issue number3
Publication statusPublished - 2006 Feb 25
Externally publishedYes


  • Anatase
  • Counter electrode
  • Dye-sensitised solar cell
  • Impedance
  • Iodide/tri-iodide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films


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