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Charge Transfer Excitons in Bulk Heterojunctions of a Polyfluorene Copolymer and a Fullerene Derivative
Open accessAbstract
The photophysical properties of blends of fluorene copolymer and the fullerene derivative PCBM are analyzed with a particular attention to photovoltaic applications. The properties of the blends are determined by the relative alignment of the HOMO energy levels. In the blend where the HOMO levels of the copolymer and the fullerene are aligned there is not signature of charge stabilization and photovoltaic effect. While in the blend where there is an offset between the HOMO levels the charge stabilization is accompanied by good photovoltaic performances. The photoluminescence spectrum of the latter blend is characterized by the appearance of a new peak at low energy with a lifetime of a few ns that red‐shifts with the increase of the PCBM percentage. The feature is attributed to the emission from a charge‐transfer exciton that is red‐shifted by the change of dielectric constant of the medium.
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Cited by
Charge Photogeneration in Organic Solar Cells
Clarke, T. M., & Durrant, J. R. (2010) · Chemical Reviews · doi:10.1021/cr900271s · Cited by 2,372
Vandewal, K., Gadisa, A., Oosterbaan, W. D., Bertho, S., Banishoeib, F., Van Severen, I., Lutsen, L., Cleij, T. J., Vanderzande, D., & Manca, J. V. (2008) · Advanced Functional Materials · doi:10.1002/adfm.200800056 · Cited by 549
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
Metadata
- Authors
- Loi, M. A., Toffanin, S., Muccini, M., Forster, M., Scherf, U., & Scharber, M.
- Venue
- Advanced Functional Materials
- Publisher
- Wiley
- Published
- 2007-07-20
- Volume
- 17
- Issue
- 13
- Pages
- 2111-2116
- ISSN
- 1616-301X (ISSN-L)
- 1616-3028
- OpenAlex
- W1991733573
- Cited by
- 217
- References
- 0
- FWCI
- 13.54
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Loi, M. A., Toffanin, S., Muccini, M., Forster, M., Scherf, U., & Scharber, M. (2007). Charge Transfer Excitons in Bulk Heterojunctions of a Polyfluorene Copolymer and a Fullerene Derivative. Advanced Functional Materials. https://doi.org/10.1002/adfm.200601098
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