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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Thermodynamic control over the competitive anchoring of N719 dye on nanocrystalline TiO2 for improving photoinduced electron generation.
Langmuir : the ACS Journal of Surfaces and Colloids 2011 December 7
TiO(2) electrodes, sensitized with the N719 dye at high immersion temperatures during the sensitization process, were found to have large fractions of weakly bound N719 on the electrode surface, which resulted in dye aggregation and decreased device longevity. These disadvantages were ameliorated using a low-temperature stearic acid (SA)-assisted anchoring method described here. The activation energy (ΔE(NS)(++)) and relative fraction of strongly bound N719 were twice as large as the respective values obtained without the use of SA. Slowing of adsorption, both by thermal means and through SA-mediated processes, effectively controlled the binding mode of N719 on the surface of TiO(2). The resulting sensitized electrodes displayed enhanced device longevity and improved generation of photoinduced electrons.
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