
Proceedings Paper
Two-electron photo-oxidation of betanin on titanium dioxide and potential for improved dye-sensitized solar energy conversionFormat | Member Price | Non-Member Price |
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Paper Abstract
The plant pigment betanin is investigated as a dye-sensitizer on TiO2 with regard to its potential to undergo twoelectron
oxidation following one-photon excitation. Electrochemical, spectroelectrochemical and transient absorption
measurements provide evidence for two-electron proton-coupled photo-oxidation leading to a quinone methide intermediate
which rearranges to 2-decarboxy-2,3-dehydrobetanin. Time-resolved spectroscopy measurements of betanin on
nanocrystalline TiO2 and ZrO2 films were performed on femtosecond and nanosecond time-scales and provide evidence
for transient species with absorption bands in the blue and the red. The results shed light on previous reports of high
quantum efficiencies for electron injection and point the way to improved solar conversion efficiency of organic dyesensitized
solar cells.
Paper Details
Date Published: 9 September 2014
PDF: 9 pages
Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650N (9 September 2014); doi: 10.1117/12.2063888
Published in SPIE Proceedings Vol. 9165:
Physical Chemistry of Interfaces and Nanomaterials XIII
Natalie Banerji; Sophia C. Hayes; Carlos Silva, Editor(s)
PDF: 9 pages
Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650N (9 September 2014); doi: 10.1117/12.2063888
Show Author Affiliations
Fritz J. Knorr, Washington State Univ. (United States)
Deborah J. Malamen, Washington State Univ. (United States)
Jeanne L. McHale, Washington State Univ. (United States)
Deborah J. Malamen, Washington State Univ. (United States)
Jeanne L. McHale, Washington State Univ. (United States)
Arianna Marchioro, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Jacques E. Moser, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Jacques E. Moser, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Published in SPIE Proceedings Vol. 9165:
Physical Chemistry of Interfaces and Nanomaterials XIII
Natalie Banerji; Sophia C. Hayes; Carlos Silva, Editor(s)
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