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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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Cites
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
Cited by
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Hagberg, D. P., Yum, J.-H., Lee, H., De Angelis, F., Marinado, T., Karlsson, K. M., Humphry-Baker, R., Sun, L., Hagfeldt, A., Grätzel, M., et al. (2008) · Journal of the American Chemical Society · doi:10.1021/ja800066y · Cited by 685
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
Sensitizer molecular structure-device efficiency relationship in dye sensitized solar cells
Clifford, J. N., Martínez-Ferrero, E., Viterisi, A., & Palomares, E. (2011) · Chem. Soc. Rev. · doi:10.1039/b920664g · Cited by 553
Starburst Triarylamine Based Dyes for Efficient Dye-Sensitized Solar Cells
Ning, Z., Zhang, Q., Wu, W., Pei, H., Liu, B., & Tian, H. (2008) · The Journal of Organic Chemistry · doi:10.1021/jo800159t · Cited by 461
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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