Jump to main content
Jump to site search

Issue 3, 2012
Previous Article Next Article

Tetrathiafulvalene as a one-electron iodine-free organic redox mediator in electrolytes for dye-sensitized solar cells

Author affiliations

Abstract

Tetrathiafulvalene (TTF) was investigated as an organic iodine-free redox mediator in electrolytes for dye-sensitized, nanocrystalline solar cells (DSCs) and was compared to the commonly used iodide/triiodide system. The TTF system studied was determined to be a one-electron transfer system, although potentially exhibiting three well-defined oxidation states. Despite the slightly positive redox potential of TTF, electrolytes with TTF displayed around 200 mV lower open-circuit voltage than the iodide/triiodide system. This can mainly be ascribed to a much shorter electron lifetime in the TiO2 film. Mass transport limitations for redox species in TTF-based electrolytes were found to be serious. Electrochemical impedance measurements (EIS) show that the charge-transfer resistance at the counter electrode in the electrolyte with TTF is considerably larger than for the iodide/triiodide system. In addition, the light absorption of the TTF-based electrolyte is stronger than that for the iodide/triiodide system. Thus, DSCs with TTF-based electrolytes show worse photovoltaic performance than those with iodide/triiodide-based electrolytes. The differences in IV characteristics and charge-recombination behavior have also been elucidated.

Graphical abstract: Tetrathiafulvalene as a one-electron iodine-free organic redox mediator in electrolytes for dye-sensitized solar cells

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 Oct 2011, accepted on 13 Oct 2011 and first published on 05 Dec 2011


Article type: Paper
DOI: 10.1039/C1RA00877C
Citation: RSC Adv., 2012,2, 1083-1087
  •   Request permissions

    Tetrathiafulvalene as a one-electron iodine-free organic redox mediator in electrolytes for dye-sensitized solar cells

    Z. Yu, H. Tian, E. Gabrielsson, G. Boschloo, M. Gorlov, L. Sun and L. Kloo, RSC Adv., 2012, 2, 1083
    DOI: 10.1039/C1RA00877C

Search articles by author

Spotlight

Advertisements