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Understanding the Role of the Sulfide Redox Couple (S2–/Sn2–) in Quantum Dot-Sensitized Solar Cells
Abstract
The presence of sulfide/polysulfide redox couple is crucial in achieving stability of metal chalcogenide (e.g., CdS and CdSe)-based quantum dot-sensitized solar cells (QDSC). However, the interfacial charge transfer processes play a pivotal role in dictating the net photoconversion efficiency. We present here kinetics of hole transfer, characterization of the intermediates involved in the hole oxidation of sulfide ion, and the back electron transfer between sulfide radical and electrons injected into TiO(2) nanoparticles. The kinetic rate constant (10(7)-10(9) s(-1)) for the hole transfer obtained from the emission lifetime measurements suggests slow hole scavenging from CdSe by S(2-) is one of the limiting factors in attaining high overall efficiency. The presence of the oxidized couple, by addition of S or Se to the electrolyte, increases the photocurrent, but it also enhances the rate of back electron transfer.
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Cited by
Li, J., Cushing, S. K., Zheng, P., Senty, T., Meng, F., Bristow, A. D., Manivannan, A., & Wu, N. (2014) · Journal of the American Chemical Society · doi:10.1021/ja503508g · Cited by 586
Kamat, P. V. (2012) · The Journal of Physical Chemistry Letters · doi:10.1021/jz201629p · Cited by 543
Self-citationRadich, E. J., Dwyer, R., & Kamat, P. V. (2011) · The Journal of Physical Chemistry Letters · doi:10.1021/jz201064k · Cited by 477
Self-citationZnO nanostructured materials for emerging solar cell applications
Wibowo, A., Marsudi, M. A., Amal, M. I., Ananda, M. B., Stephanie, R., Ardy, H., & Diguna, L. J. (2020) · RSC Advances · doi:10.1039/d0ra07689a · Cited by 417
Jun, H. K., Careem, M. A., & Arof, A. K. (2013) · Renewable and Sustainable Energy Reviews · doi:10.1016/j.rser.2013.01.030 · Cited by 373
Faber, M. S., Park, K., Cabán-Acevedo, M., Santra, P. K., & Jin, S. (2013) · The Journal of Physical Chemistry Letters · doi:10.1021/jz400642e · Cited by 206
Metadata
- Authors
- Chakrapani, V., Baker, D., & Kamat, P. V.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-05-25
- Volume
- 133
- Issue
- 24
- Pages
- 9607-9615
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2317366577
- Cited by
- 312
- References
- 0
- FWCI
- 15.37
- Type
- journal article
- Language
- en
- Open access
- closed
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