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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Hauptverfasser: Untilova, Viktoriia (VerfasserIn) , Hynynen, Jonna (VerfasserIn) , Hofmann, Anna I. (VerfasserIn) , Scheunemann, Dorothea (VerfasserIn) , Zhang, Yadong (VerfasserIn) , Barlow, Stephen (VerfasserIn) , Kemerink, Martijn (VerfasserIn) , Marder, Seth R. (VerfasserIn) , Biniek, Laure (VerfasserIn) , Müller, Christian (VerfasserIn) , Brinkmann, Martin (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: [2020]
In: Macromolecules
Year: 2020, Jahrgang: 53, Heft: 15, Pages: 6314-6321
ISSN:1520-5835
DOI:10.1021/acs.macromol.0c01223
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.macromol.0c01223
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Verfasserangaben: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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520 |a 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. 
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