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Probing Inter- and Intra-chain Excitonic Coupling in Crystalline Polythiophene Nanofibers and Nanoparticles
Published online by Cambridge University Press: 13 March 2013
Abstract
We summarize some recent new results probing inter- and intra-chain coupling in aggregated P3HT in isolated nanoparticles and nanofibers. Time-resolved photoluminescence studies show interesting correlations between amplitude and decay constant for different decay components that are tied to both polymer regio-regularity and nanoparticle processing conditions. In the frequency domain, we observe distinct signatures of both H- and J-aggregate type exciton coupling, manifested as different vibronic progressions with different electronic origins, linewidths, and Huang-Rhys factors. We show how the extent of this H/J composite coupling can be tuned to a certain extent by changes in molecular parameters (polymer molecular weight and regioregularity) and by solvent processing conditions. Finally we discuss recent results of near-field optical absorption probes of nanoparticles and nanofibers where optical contrast is afforded by the different absorption cross-section (at 532 nm) for aggregated vs. unaggregated P3HT.
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- Information
- MRS Online Proceedings Library (OPL) , Volume 1500: Symposium O – Next-Generation Polymer-Based Organic Photovoltaics , 2013 , mrsf12-1500-o10-09
- Copyright
- Copyright © Materials Research Society 2013
Footnotes
These authors contributed equally to this work