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Charge Carrier Dynamics of Polymer: Fullerene Blends: From Geminate to Non-Geminate Recombination
Lund University, Sweden .
Chalmers University of Technology, Göteborg, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Lund University, Sweden .
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2014 (English)In: Advanced Energy Materials, ISSN 1614-6832, EISSN 1614-6840, Vol. 4, no 8Article in journal (Refereed) Published
Abstract [en]

The charge carrier dynamics of a new polymer-fullerene blend are examined on the femtosecond to the millisecond time scale. The full time range is globally fitted using a chemical reaction rate model that includes all key processes, charge generation, energy transfer, charge separation, and recombination, over the full 12 orders of magnitude in time and a factor of 33 in light intensity. Particular attention is paid to the charge recombination processes and it is found that they are highly material specific. Comparison of the dynamics to those of a previously studied polymer: fullerene blend reveals that while for one blend the recombination dynamics are mainly controlled by geminate recombination, the charge recombination in the presently studied polymer: fullerene blend are entirely controlled by non-geminate electron-hole recombination. Carrier density dependence of the non-geminate recombination rate is analyzed and a correlated disorder model of site energies is proposed to explain the observed dependency.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2014. Vol. 4, no 8
National Category
Chemical Sciences Biological Sciences
URN: urn:nbn:se:liu:diva-109191DOI: 10.1002/aenm.201301706ISI: 000338020900015OAI: diva2:737339
Available from: 2014-08-12 Created: 2014-08-11 Last updated: 2014-09-11Bibliographically approved

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