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Dye Capped Semiconductor Nanoclusters. Role of Back Electron Transfer in the Photosensitization of SnO2 Nanocrystallites with Cresyl Violet Aggregates
Abstract
Adsorption of a cationic dye, cresyl violet, on SnO 2 and SiO 2 nanoclusters and nanocrystalline thin films results in the formation of H-aggregates. These dyes are photochemically and electrochemically active and extend the photoresponse of large bandgap semiconductors such as SnO 2 . Photocurrent generation in dye capped nanocrystalline films of SnO 2 has been demonstrated with visible light excitation. A photon-to-photocurrent generation efficiency around 1% has been observed at 510 nm. Back electron transfer between the photoinjected electron and the oxidized sensitizer plays an important role in controlling the efficiency of net electron transfer. Transient absorption and microwave absorption measurements of the dye aggregate capped SnO 2 films suggest that the back electron transfer is multiexponential and most is completed within a few hundred nanoseconds. The activation energy of the back electron transfer process is very low (∼1.7 kJ/mol).
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The exciton model in molecular spectroscopy
Kasha, M., Rawls, H. R., & Ashraf El-Bayoumi, M. (1965) · Pure and Applied Chemistry · doi:10.1351/pac196511030371 · Cited by 4,253
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Cherepy, N. J., Smestad, G. P., Grätzel, M., & Zhang, J. Z. (1997) · The Journal of Physical Chemistry B · doi:10.1021/jp972197w · Cited by 607
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Metadata
- Authors
- Liu, D., Fessenden, R. W., Hug, G. L., & Kamat, P. V.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-04-01
- Volume
- 101
- Issue
- 14
- Pages
- 2583-2590
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2076485619
- Cited by
- 192
- References
- 1
- FWCI
- 7.96
- Type
- journal article
- Language
- en
- Open access
- closed
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- Liu, D., Fessenden, R. W., Hug, G. L., & Kamat, P. V. (1997). Dye Capped Semiconductor Nanoclusters. Role of Back Electron Transfer in the Photosensitization of SnO2 Nanocrystallites with Cresyl Violet Aggregates. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp962695p
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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