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A Chemically Doped Naphthalenediimide-Bithiazole Polymer for n-Type Organic Thermoelectrics
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
Tech Univ Dresden, Germany; Leibniz Inst Polymerforsch Dresden eV, Germany; Flexterra Corp, IL 60077 USA; IBM Almaden Res Ctr, CA 95120 USA.
Northwestern Univ, IL 60208 USA.
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2018 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 30, no 31, article id 1801898Article in journal (Refereed) Published
Abstract [en]

The synthesis of a novel naphthalenediimide (NDI)-bithiazole (Tz2)-based polymer [P(NDI2OD-Tz2)] is reported, and structural, thin-film morphological, as well as charge transport and thermoelectric properties are compared to the parent and widely investigated NDI-bithiophene (T2) polymer [P(NDI2OD-T2)]. Since the steric repulsions in Tz2 are far lower than in T2, P(NDI2OD-Tz2) exhibits a more planar and rigid backbone, enhancing p-p chain stacking and intermolecular interactions. In addition, the electron-deficient nature of Tz2 enhances the polymer electron affinity, thus reducing the polymer donor-acceptor character. When n-doped with amines, P(NDI2OD-Tz2) achieves electrical conductivity (approximate to 0.1 S cm(-1)) and a power factor (1.5 mu W m(-1) K-2) far greater than those of P(NDI2OD-T2) (0.003 S cm(-1) and 0.012 mu W m(-1) K-2, respectively). These results demonstrate that planarized NDI-based polymers with reduced donor-acceptor character can achieve substantial electrical conductivity and thermoelectric response.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 30, no 31, article id 1801898
Keywords [en]
donor-acceptor polymers; doping; NDI-based polymers; n-type polymers; organic thermoelectrics
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-151506DOI: 10.1002/adma.201801898ISI: 000443807400024PubMedID: 29926985OAI: oai:DiVA.org:liu-151506DiVA, id: diva2:1250621
Note

Funding Agencies|Knut and Alice Wallenberg Foundation; Swedish Foundation for Strategic Research; VINNOVA [2015-04859]; Swedish Research Council [2016-03979]; Advanced Functional Materials Center at Linkoping University [2009-00971]; U.S. Department of Commerce, National Institute of Standards and Technology, Center for Hierarchical Materials Design (CHiMaD) [70NANB14H012]; DOE Office of Science [DE-AC02-06CH11357]; DFG within the CoEcfaed [KI-1094/9, FA 1502/1-1]; Humboldt Foundation

Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2019-03-18

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