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Título

Electronic structure of Fe- vs. Ru-based dye molecules

Autor Johnson, Philip S.; Cook, Peter L.; Zegkinoglou, Ioannis; García-Lastra, J. M.; Rubio, Angel; Ruther, Rose E.; Hamers, Robert J.; Himpsel, F. J.
Fecha de publicación 2013
EditorAmerican Institute of Physics
Citación Journal of Chemical Physics 138(4): 044709 (2013)
ResumenIn order to explore whether Ru can be replaced by inexpensive Fe in dye molecules for solar cells, the differences in the electronic structure of Fe- and Ru-based dyes are investigated by X-ray absorption spectroscopy and first-principles calculations. Molecules with the metal in a sixfold, octahedral N cage, such as tris(bipyridines) and tris(phenanthrolines), exhibit a systematic downward shift of the N 1s-to-π* transition when Ru is replaced by Fe. This shift is explained by an extra transfer of negative charge from the metal to the N ligands in the case of Fe, which reduces the binding energy of the N 1s core level. The C 1s-to-π* transitions show the opposite trend, with an increase in the transition energy when replacing Ru by Fe. Molecules with the metal in a fourfold, planar N cage (porphyrins) exhibit a more complex behavior due to a subtle competition between the crystal field, axial ligands, and the 2+ vs. 3+ oxidation states.
Versión del editorhttp://dx.doi.org/10.1063/1.4788617
URI http://hdl.handle.net/10261/95103
DOI10.1063/1.4788617
Identificadoresdoi: 10.1063/1.4788617
issn: 0021-9606
e-issn: 1089-7690
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