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Full Paper
Charge Transfer Excitons in Polymer/Fullerene Blends: The Role of Morphology and Polymer Chain Conformation
Article first published online: 8 OCT 2009
DOI: 10.1002/adfm.200901398
Copyright © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Additional Information
How to Cite
Hallermann, M., Kriegel, I., Da Como, E., Berger, J. M., von Hauff, E. and Feldmann, J. (2009), Charge Transfer Excitons in Polymer/Fullerene Blends: The Role of Morphology and Polymer Chain Conformation. Adv. Funct. Mater., 19: 3662–3668. doi: 10.1002/adfm.200901398
Publication History
- Issue published online: 20 NOV 2009
- Article first published online: 8 OCT 2009
- Manuscript Received: 27 JUL 2009
Funded by
- German Excellence Initiative
- Abstract
- References
- Cited By
Keywords:
- conjugated polymers;
- fullerenes;
- organic photovoltaics
Abstract
Here, it is shown how carrier recombination through charge transfer excitons between conjugated polymers and fullerene molecules is mainly controlled by the intrachain conformation of the polymer, and to a limited extent by the mesoscopic morphology of the blend. This experimental result is obtained by combining near-infrared photoluminescence spectroscopy and transmission electron microscopy, which are sensitive to charge transfer exciton emission and morphology, respectively. The photoluminescence intensity of the charge transfer exciton is correlated to the degree of intrachain order of the polymer, highlighting an important aspect for understanding and limiting carrier recombination in organic photovoltaics.