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An Optimal Driving Force for Converting Excitons into Free Carriers in Excitonic Solar Cells
Abstract
A general but limiting characteristic in excitonic photovoltaics is that a portion of the incident photon energy appears necessary for converting excitons into electrical charges, resulting in a loss of efficiency. Currently, the mechanism underlying this process is unclear. Here, we describe the development of an experimental method for measuring charge creation yields in organic solar cell materials. We use this method to examine a series of conjugated polymer:fullerene blend films and observe two unexpected features: the existence of an optimal driving force and a loss in conversion efficiency if this force is exceeded. These observations have implications for the design of excitonic photovoltaic devices and can be explained by a simple Marcus formulation that introduces the importance of reorganization energy.
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Cited by
Organic Photodiodes: The Future of Full Color Detection and Image Sensing
Jansen‐van Vuuren, R. D., Armin, A., Pandey, A. K., Burn, P. L., & Meredith, P. (2016) · Advanced Materials · doi:10.1002/adma.201505405 · Cited by 819
Light Harvesting for Organic Photovoltaics
Hedley, G. J., Ruseckas, A., & Samuel, I. D. W. (2017) · Chemical Reviews · doi:10.1021/acs.chemrev.6b00215 · Cited by 580
Small is Powerful: Recent Progress in Solution‐Processed Small Molecule Solar Cells
Collins, S. D., Ran, N. A., Heiber, M. C., & Nguyen, T. (2017) · Advanced Energy Materials · doi:10.1002/aenm.201602242 · Cited by 414
Savenije, T. J., Ferguson, A. J., Kopidakis, N., & Rumbles, G. (2013) · The Journal of Physical Chemistry C · doi:10.1021/jp406706u · Cited by 257
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Metadata
- Authors
- Coffey, D. C., Larson, B. W., Hains, A. W., Whitaker, J. B., Kopidakis, N., Boltalina, O. V., Strauss, S. H., & Rumbles, G.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-04-15
- Volume
- 116
- Issue
- 16
- Pages
- 8916-8923
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W1964077714
- Cited by
- 170
- References
- 0
- FWCI
- 11.19
- Type
- journal article
- Language
- en
- Open access
- closed
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- Coffey, D. C., Larson, B. W., Hains, A. W., Whitaker, J. B., Kopidakis, N., Boltalina, O. V., Strauss, S. H., & Rumbles, G. (2012). An Optimal Driving Force for Converting Excitons into Free Carriers in Excitonic Solar Cells. The Journal of Physical Chemistry C. https://doi.org/10.1021/jp302275z
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