Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers

Journal article
(Original article)


Publication Details

Author(s): Kahmann S, Loi MA, Brabec C
Journal: Journal of Materials Chemistry C
Publisher: Royal Society of Chemistry
Publication year: 2018
Volume: 6
Journal issue: 22
Pages range: 6008-6013
ISSN: 2050-7534
Language: English


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.


FAU Authors / FAU Editors

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


Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden


External institutions
University of Groningen / Rijksuniversiteit Groningen


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://dx.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.

BibTeX: 

Last updated on 2018-30-09 at 14:50