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High thermoelectric power factor of Poly(3-hexylthiophene) through in-plane alignment and doping with a molybdenum dithiolene complex

We report a record thermoelectric power factor of up to 160 μW m-1 K-2 for the conjugated polymer poly(3-hexylthiophene) (P3HT). This result is achieved through the combination of high-temperature rubbing of thin films together with the use of a large molybdenum dithiolene p-dopant with a high elect...

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Main Authors: Untilova, Viktoriia (Author) , Hynynen, Jonna (Author) , Hofmann, Anna I. (Author) , Scheunemann, Dorothea (Author) , Zhang, Yadong (Author) , Barlow, Stephen (Author) , Kemerink, Martijn (Author) , Marder, Seth R. (Author) , Biniek, Laure (Author) , Müller, Christian (Author) , Brinkmann, Martin (Author)
Format: Article (Journal)
Language:English
Published: [2020]
In: Macromolecules
Year: 2020, Volume: 53, Issue: 15, Pages: 6314-6321
ISSN:1520-5835
DOI:10.1021/acs.macromol.0c01223
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.macromol.0c01223
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Author Notes:Viktoriia Untilova, Jonna Hynynen, Anna I. Hofmann, Dorothea Scheunemann, Yadong Zhang, Stephen Barlow, Martijn Kemerink, Seth R. Marder, Laure Biniek, Christian Müller, and Martin Brinkmann
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Summary:We report a record thermoelectric power factor of up to 160 μW m-1 K-2 for the conjugated polymer poly(3-hexylthiophene) (P3HT). This result is achieved through the combination of high-temperature rubbing of thin films together with the use of a large molybdenum dithiolene p-dopant with a high electron affinity. Comparison of the UV-vis-NIR spectra of the chemically doped samples to electrochemically oxidized material reveals an oxidation level of 10%, i.e., one polaron for every 10 repeat units. The high power factor arises due to an increase in the charge-carrier mobility and hence electrical conductivity along the rubbing direction. We conclude that P3HT, with its facile synthesis and outstanding processability, should not be ruled out as a potential thermoelectric material.
Item Description:Gesehen am 25.09.2020
Physical Description:Online Resource
ISSN:1520-5835
DOI:10.1021/acs.macromol.0c01223

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