Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers

Kahmann S, Loi MA, Brabec C (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Journal of Materials Chemistry C Royal Society of Chemistry

Publisher: Royal Society of Chemistry

Book Volume: 6

Pages Range: 6008-6013

Journal Issue: 22

DOI: 10.1039/c8tc00909k

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 – blends of the homopolymer P3HT or the donor–acceptor polymer PCPDTBT with PCBM – allows probing 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 due to a higher polymer chain order. Our findings help in providing a more complete understanding of polaron properties in conjugated materials and bring the application of the polaron absorption spectrum as an indicator for the environment on a more thoroughly studied foundation.

Authors with CRIS profile

Simon Kahmann Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET)

Additional Organisation(s)

Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Involved external institutions

University of Groningen / Rijksuniversiteit Groningen NL Netherlands (NL)

How to cite

APA:

Kahmann, S., Loi, M.A., & Brabec, C. (2018). Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers. Journal of Materials Chemistry C, 6(22), 6008-6013. https://doi.org/10.1039/c8tc00909k

MLA:

Kahmann, Simon, Maria A. Loi, and Christoph Brabec. "Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers." Journal of Materials Chemistry C 6.22 (2018): 6008-6013.

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