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 D. Anthopoulos, Henning Sirringhaus, Kigook Song, Martin Heeney, Weimin Zhang, Iain McCulloch () and Dean M. DeLongchamp ()
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Xinran Zhang: National Institute of Standards and Technology
Hugo Bronstein: University College London
Auke J. Kronemeijer: Cavendish Laboratory, Cambridge University
Jeremy Smith: Imperial College London
Youngju Kim: Imperial College London
R. Joseph Kline: National Institute of Standards and Technology
Lee J. Richter: National Institute of Standards and Technology
Thomas D. Anthopoulos: Imperial College London
Henning Sirringhaus: Cavendish Laboratory, Cambridge University
Kigook Song: Materials Research Center for Information Display, Kyung Hee University
Martin Heeney: Imperial College London
Weimin Zhang: Imperial College London
Iain McCulloch: Imperial College London
Dean M. DeLongchamp: National Institute of Standards and Technology

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: 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 cm2 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.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3238

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DOI: 10.1038/ncomms3238

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