Molecular origin of high field-effect mobility in an indacenodithiophene- benzothiadiazole copolymer

Xinran Zhang, Hugo Bronstein, Auke J. Kronemeijer, Jeremy Smith, Youngju Kim, R. Joseph Kline, Lee J. Richter, Thomas Anthopoulos, Henning Sirringhaus, Kigook Song, Martin Heeney, Weimin Zhang, Iain Mcculloch, Dean M. Delongchamp*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

333 Scopus citations

Abstract

One of the most inspiring and puzzling developments in the organic electronics community in the last few years has been the emergence of solution-processable semiconducting polymers that lack significant long-range order\ but outperform the best, high-mobility, ordered semiconducting polymers to date. Here we provide new insights into the charge-transport mechanism in semiconducting polymers and offer new molecular design guidelines by examining a state-of-the-art indacenodithiophene-benzothiadiazole copolymer having field-effect mobility of up to 3.6 cm 2 V -1 s -1 with a combination of diffraction and polarizing spectroscopic techniques. Our results reveal that its conjugated planes exhibit a common, comprehensive orientation in both the non-crystalline regions and the ordered crystallites, which is likely to originate from its superior backbone rigidity. We argue that charge transport in high-mobility semiconducting polymers is quasi one-dimensional, that is, predominantly occurring along the backbone, and requires only occasional intermolecular hopping through short π-stacking bridges.

Original languageEnglish (US)
Article number2238
JournalNature Communications
Volume4
DOIs
StatePublished - Aug 15 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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