Substitution of a hydroxamic acid anchor into the MK-2 dye for enhanced photovoltaic performance and water stability in a DSSC
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Otros documentos de la autoría: Koenigsmann, C.; Ripollés Sanchis, Teresa; Brennan, B. J.; Negre, C. F. A.; Koepf, M.; Durrell, A. C.; Milot, R. L.; Torre, J. A.; Crabtree, Robert H.; Batista, V. S.; Brudvig, Gary W.; Bisquert, Juan; Schmuttenmaer, C. A.
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http://dx.doi.org/10.1039/c4cp02405b |
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Título
Substitution of a hydroxamic acid anchor into the MK-2 dye for enhanced photovoltaic performance and water stability in a DSSCAutoría
Fecha de publicación
2014Editor
Royal Society of ChemistryISSN
1463-9076; 1463-9084Cita bibliográfica
Phys. Chem. Chem. Phys., 2014, 16, 16629Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://pubs.rsc.org/en/content/articlepdf/2014/cp/c4cp02405bVersión
info:eu-repo/semantics/publishedVersionResumen
An efficient synthetic protocol to functionalize the cyanoacrylic acid anchoring group of commercially
available MK-2 dye with a highly water-stable hydroxamate anchoring group is described. Extensive
characterization ... [+]
An efficient synthetic protocol to functionalize the cyanoacrylic acid anchoring group of commercially
available MK-2 dye with a highly water-stable hydroxamate anchoring group is described. Extensive
characterization of this hydroxamate-modified dye (MK-2HA) reveals that the modification does not
affect its favorable optoelectronic properties. Dye-sensitized solar cells (DSSCs) prepared with the MK-
2HA dye attain improved efficiency (6.9%), relative to analogously prepared devices with commercial
MK-2 and N719 dyes. The hydroxamate anchoring group also contributes to significantly increased
water stability, with a decrease in the rate constant for dye desorption of MK-2HA relative to MK-2 in
the presence of water by as much as 37.5%. In addition, the hydroxamate-anchored dye undergoes
essentially no loss in DSSC efficiency and the external quantum efficiency improves when up to 20%
water is purposefully added to the electrolyte. In contrast, devices prepared with the commercial dye
suffer a 50% decline in efficiency under identical conditions, with a concomitant decrease in external
quantum efficiency. Collectively, our results indicate that covalent functionalization of organic dyes with
hydroxamate anchoring groups is a simple and efficient approach to improving the water stability of the
dye–semiconductor interface and overall device durability [-]
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Phys. Chem. Chem. Phys., 2014, 16, 16629--16641Derechos de acceso
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