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Excitonic coupling dominates the homogeneous photoluminescence excitation linewidth in semicrystalline polymeric semiconductors

By Pascal Grégoire, Eleonora Vella, MJ Dyson, Claudia M Bazán, Richard Leonelli, Natalie Stingelin, Paul N Stavrinou, Eric R Bittner and Carlos A Silva

Abstract

We measure the homogeneous excitation linewidth of regioregular poly(3-hexylthiophene), a model semicrystalline polymeric semiconductor, by means of two-dimensional coherent photoluminescence excitation spectroscopy. At a temperature of 8\,K, we find a linewidth that is always $\gtrsim 110$\,meV full-width-at-half-maximum, which is a significant fraction of the total linewidth. It displays a spectral dependence and is minimum near the 0--0 origin peak. We interpret this spectral dependence of the homogeneous excitation linewidth within the context of a weakly coupled aggregate model

Publisher: 'American Physical Society (APS)'
Year: 2017
OAI identifier: oai:library.tue.nl:878014
Provided by: Repository TU/e
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