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Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers

Abstract

In this work we study the photoinduced signatures of polarons in conjugated polymers and the impact of charge carrier delocalisation on their spectra. The variation of film crystallinity for two prototypical systems \textendash\ blends of the homopolymer P3HT or the donor-acceptor polymer PCPDTBT with PCBM \textendash\ allows to probe changes of the polaron absorption in the mid infrared spectral region. Increased polaron delocalisation entails a shift of the electronic transition to lower energy in both cases. Also, infrared active vibrations soften for higher polymer chain order. Our findings help in the development of a more complete understanding of polaron properties in conjugated materials and bring the application of the polaron absorption spectrum as indicator for the environment on a more thoroughly studied foundation.

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Publication details

The article was received on 22 Feb 2018, accepted on 08 May 2018 and first published on 09 May 2018


Article type: Paper
DOI: 10.1039/C8TC00909K
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers

    S. Kahmann, M. A. Loi and C. J. Brabec, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00909K

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