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Effect of Additives on the Photovoltaic Performance of Coumarin-Dye-Sensitized Nanocrystalline TiO2Solar Cells
Abstract
The effects of deoxycholic acid (DCA) and 4-tert-butylpyridine (TBP) as additives on the photovoltaic performance of coumarin-dye-sensitized nanocrystalline TiO2 solar cells were investigated. DCA coadsorption improved both the photocurrent and photovoltage of the solar cells, even though it decreased the amount of dye adsorbed on the TiO2 electrode. The improved photocurrent may arise from suppression of the deactivation of the excited state via quenching processes between dye molecules or a more negative LUMO level of the dye in the presence of DCA, resulting in a high electron-injection yield from the dye into TiO2. The increased photovoltage is probably due to suppression of recombination between the injected electrons and I3- ions on the TiO2 surface (dark current). The addition of TBP to the electrolyte also markedly improved the photovoltage and fill factor of the solar cell, and consequently, the total conversion efficiency increased from 3.6% to 7.5%. FT-IR spectroscopy indicated that a large amount of TBP was adsorbed on the dye-coated TiO2 films in the presence of Li cations. This result suggests that TBP, like DCA, suppressed the dark current on the TiO2 surface, which resulted in the improved photovoltage.
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Cited by
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Zhang, S., Yang, X., Numata, Y., & Han, L. (2013) · Energy & Environmental Science · doi:10.1039/c3ee24453a · Cited by 656
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Wang, Z.-S., Cui, Y., Dan-oh, Y., Kasada, C., Shinpo, A., & Hara, K. (2007) · The Journal of Physical Chemistry C · doi:10.1021/jp067872t · Cited by 521
Self-citationAqueous dye-sensitized solar cells
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Photophysical and (Photo)electrochemical Properties of a Coumarin Dye
Wang, Z.-S., Hara, K., Dan-oh, Y., Kasada, C., Shinpo, A., Suga, S., Arakawa, H., & Sugihara, H. (2005) · The Journal of Physical Chemistry B · doi:10.1021/jp044851v · Cited by 311
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Dye-sensitized TiO2 nanotube solar cells: fabrication and electronic characterization
Ohsaki, Y., Masaki, N., Kitamura, T., Wada, Y., Okamoto, T., Sekino, T., Niihara, K., & Yanagida, S. (2005) · Physical Chemistry Chemical Physics · doi:10.1039/b511016e · Cited by 288
Dye-sensitized solar cells with natural dyes extracted from achiote seeds
Gómez-Ortíz, N. M., Vázquez-Maldonado, I. A., Pérez-Espadas, A. R., Mena-Rejón, G. J., Azamar-Barrios, J. A., & Oskam, G. (2010) · Solar Energy Materials and Solar Cells · doi:10.1016/j.solmat.2009.05.013 · Cited by 278
Kopidakis, N., Neale, N. R., & Frank, A. J. (2006) · The Journal of Physical Chemistry B · doi:10.1021/jp0607364 · Cited by 278
Metadata
- Authors
- Hara, K., Dan-oh, Y., Kasada, C., Ohga, Y., Shinpo, A., Suga, S., Sayama, K., & Arakawa, H.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-04-10
- Volume
- 20
- Issue
- 10
- Pages
- 4205-4210
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2085702033
- Cited by
- 410
- References
- 0
- FWCI
- 8.34
- Type
- journal article
- Language
- en
- Open access
- closed
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