Journal
CHEMPHYSCHEM
Volume 16, Issue 14, Pages 3049-3057Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201500419
Keywords
catechols; charge transfer; dyes; sensitizers; solar cells
Funding
- Japan Society for the Promotion of Science (JSPS) [15H03859]
- Kato Foundation for Promotion of Science
- Grants-in-Aid for Scientific Research [15H03859] Funding Source: KAKEN
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In order to provide a direction in molecular design of catechol (Cat) dyes for type II dye-sensitized solar cells (DSSCs), the dye-to-TiO2 charge-transfer (DTCT) characteristics of Cat dyes with various substituents and their photovoltaic performance in DSSCs are investigated. The Cat dyes with electron-donating or moderately electron-withdrawing substituents exhibit a broad absorption band corresponding to DTCT upon binding to TiO2 films, whereas those with strongly electron-withdrawing sub-stituents exhibit weak DTCT. This study indicates that the introduction of a moderately electron-withdrawing substituent on the Cat moiety leads to not only an increase in the DTCT efficiency, but also the retardation of back electron transfer. This results in favorable conditions for the type II electron-injection pathway from the ground state of the Cat dye to the conduction band of the TiO2 electrode by the photoexcitation of DTCT bands.
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