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Issue 38, 2016
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Optical properties of regioregular poly(3-hexylthiophene) aggregates from fully atomistic investigations

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Abstract

We report on a first-principle theoretical investigation of the optical absorption and emission spectra of poly(3-hexylthiophene) (P3HT) aggregates by means of a multiscale all-atom hybrid approach, which combines: (i) molecular dynamics simulations of (intrachain) conformational and (interchain) positional disorder, (ii) quantum-chemical calculations of intrachain excited states and excitonic interactions, and (iii) solving of a Frenkel–Holstein model that includes coupling of the electronic excitations to a dominant high-frequency molecular vibration. The modeling work points to the co-existence of ordered nano-aggregates into disordered domains, with the former dominating the emission spectrum while both regions contribute to the absorption spectrum. The measured photoluminescence line shape and the Stokes shift are both reproduced by the theory for aggregates comprising polymer chain with lengths ∼35–40 repeating units.

Graphical abstract: Optical properties of regioregular poly(3-hexylthiophene) aggregates from fully atomistic investigations

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Publication details

The article was received on 22 Mar 2016, accepted on 01 Jun 2016 and first published on 01 Jun 2016


Article type: Paper
DOI: 10.1039/C6CE00645K
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CrystEngComm, 2016,18, 7297-7304

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    Optical properties of regioregular poly(3-hexylthiophene) aggregates from fully atomistic investigations

    L. Wang and D. Beljonne, CrystEngComm, 2016, 18, 7297
    DOI: 10.1039/C6CE00645K

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