Issue 22, 2018

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 – 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.

Graphical abstract: Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers

Supplementary files

Article information

Article type
Paper
Submitted
22 Feb 2018
Accepted
08 May 2018
First published
09 May 2018

J. Mater. Chem. C, 2018,6, 6008-6013

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, 6, 6008 DOI: 10.1039/C8TC00909K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements