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Phenoxazine Dyes for Dye-Sensitized Solar Cells: Relationship Between Molecular Structure and Electron Lifetime
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
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2011 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 17, no 23, 6415-6424 p.Article in journal (Refereed) Published
Abstract [en]

A series of metal-free organic dyes with a core phenoxazine chromophore have been synthesized and tested as sensitizers in dye-sensitized solar cells. Overall conversion efficiencies of 6.03-7.40% were reached under standard AM 1.5G illumination at a light intensity of 100 mW cm(-2). A clear trend in electron lifetime could be seen; a dye with a furan-conjugated linker showed a shorter lifetime relative to dyes with the acceptor group directly attached to the phenoxazine. The addition of an extra donor unit, which bore insulating alkoxyl chains, in the 7-position of the phenoxazine could increase the lifetime even further and, together with additives in the electrolyte to raise the conduction band, an open circuit voltage of 800 mV could be achieved. From photoelectron spectroscopy and X-ray absorption spectroscopy of the dyes adsorbed on TiO2 particles, it can be concluded that the excitation is mainly of cyano character (i.e., on average, the dye molecules are standing on, and pointing out, from the surface of TiO2 particles).

Place, publisher, year, edition, pages
2011. Vol. 17, no 23, 6415-6424 p.
Keyword [en]
charge transfer, dyes/pigments, energy conversion, sensitizers, solar cells
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-156118DOI: 10.1002/chem.201003730ISI: 000292095800018OAI: oai:DiVA.org:uu-156118DiVA: diva2:430510
Available from: 2011-07-11 Created: 2011-07-11 Last updated: 2012-12-06Bibliographically approved

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Eriksson, Susanna KaufmanRensmo, HåkanHagfeldt, Anders
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Physical ChemistryDepartment of Physics and Astronomy
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