Issue 5, 2018

Using graphs to quantify energetic and structural order in semicrystalline oligothiophene thin films

Abstract

In semicrystalline conjugated polymer thin films, the mobility of charges depends on the arrangement of the individual polymer chains. In particular, the ordering of the polymer backbones affects the charge transport within the film, as electron transfer generally occurs along the backbones with alternating single and double bonds. In this paper, we demonstrate that polymer ordering should be discussed not only in terms of structural but also energetic ordering of polymer chains. We couple data from molecular dynamics simulations and quantum chemical calculations to quantify both structural and energetic ordering of polymer chains. We leverage a graph-based representation of the polymer chains to quantify the transport pathways in a computationally efficient way. Next, we formulate the morphological descriptors that correlate well with hole mobility determined using kinetic Monte Carlo simulations. We show that the shortest and fastest path calculations are predictive of mobility in equilibrated morphologies. In this sense, we leverage graph-based descriptors to provide a basis for the quantitative structure property relationships.

Graphical abstract: Using graphs to quantify energetic and structural order in semicrystalline oligothiophene thin films

Supplementary files

Article information

Article type
Paper
Submitted
25 May 2018
Accepted
26 Jul 2018
First published
26 Jul 2018

Mol. Syst. Des. Eng., 2018,3, 853-867

Author version available

Using graphs to quantify energetic and structural order in semicrystalline oligothiophene thin films

E. Van, M. Jones, E. Jankowski and O. Wodo, Mol. Syst. Des. Eng., 2018, 3, 853 DOI: 10.1039/C8ME00028J

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