Journal
LANGMUIR
Volume 27, Issue 23, Pages 14647-14653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la2026329
Keywords
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Funding
- Fundamental R&D Program for Core Technology of Materials [M2009010025]
- MKE
- NRF
- MEST [2010-0000406, 2010-0019119]
- BK21 (Brain Korea 21)
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0006060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0082722, 2009-0079879] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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TiO2 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 (Delta E-NS(double dagger)) 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 TiO2. The resulting sensitized electrodes displayed enhanced device longevity and improved generation of photoinduced electrons.
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