Generic Model for Lamellar Self-Assembly in Conjugated Polymers: Linking Mesoscopic Morphology and Charge Transport in P3HT

Macromolecules
Cristina GrecoKostas Ch Daoulas

Abstract

We develop a generic coarse-grained model of soluble conjugated polymers, capable of describing their self-assembly into a lamellar mesophase. Polymer chains are described by a hindered-rotation model, where interaction centers represent entire repeat units, including side chains. We introduce soft anisotropic nonbonded interactions to mimic the potential of mean force between atomistic repeat units. The functional form of this potential reflects the symmetry of the molecular order in a lamellar mesophase. The model can generate both nematic and lamellar (sanidic smectic) molecular arrangements. We parametrize this model for a soluble conjugated polymer poly(3-hexylthiophene) (P3HT) and demonstrate that the simulated lamellar mesophase matches morphologies of low molecular weight P3HT, experimentally observed at elevated temperatures. A qualitative charge-transport model allows us to link local chain conformations and mesoscale order to charge transport. In particular, it shows how coarsening of lamellar domains and chain extension increase the charge carrier mobility. By modeling large systems and long chains, we can capture transport between lamellar layers, which is due to rare, but thermodynamically allowed, backbone bridge...Continue Reading

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Citations

Sep 14, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Francisco J MelendezRené Gutiérrez-Pérez
Apr 13, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Fabian BerressemArash Nikoubashman
May 20, 2021·Physical Chemistry Chemical Physics : PCCP·Tobias KochNikos L Doltsinis
May 28, 2020·ACS Applied Materials & Interfaces·Ehsan HosseiniKunal Karan
Jun 12, 2020·Journal of Chemical Information and Modeling·Wesley K TatumChristine K Luscombe
Dec 29, 2020·The Journal of Physical Chemistry. B·Nicholas E Jackson

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