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Tetrathiafulvalene as a one-electron iodine-free organic redox mediator in electrolytes for dye-sensitized solar cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2012 (English)In: RSC Advances, ISSN 2046-2069, Vol. 2, no 3, 1083-1087 p.Article in journal (Refereed) Published
Abstract [en]

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 TiO(2) 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 I-V characteristics and charge-recombination behavior have also been elucidated.

Place, publisher, year, edition, pages
2012. Vol. 2, no 3, 1083-1087 p.
National Category
Chemical Sciences
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URN: urn:nbn:se:uu:diva-168744DOI: 10.1039/c1ra00877cISI: 000299177000049OAI: oai:DiVA.org:uu-168744DiVA: diva2:503680
Available from: 2012-02-16 Created: 2012-02-15 Last updated: 2014-02-12Bibliographically approved

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Tian, HainingBoschloo, Gerrit

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