@article{7bc5a0bc15674f51b4ee3a6d3b529e19,
title = "A Chemically Doped Naphthalenediimide-Bithiazole Polymer for n-Type Organic Thermoelectrics",
abstract = "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 π–π 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 (≈0.1 S cm−1) and a power factor (1.5 µW m−1 K−2) far greater than those of P(NDI2OD-T2) (0.003 S cm−1 and 0.012 µW 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.",
keywords = "NDI-based polymers, donor–acceptor polymers, doping, n-type polymers, organic thermoelectrics",
author = "Suhao Wang and Hengda Sun and Tim Erdmann and Gang Wang and Daniele Fazzi and Uwe Lappan and Yuttapoom Puttisong and Zhihua Chen and Magnus Berggren and Xavier Crispin and Anton Kiriy and Brigitte Voit and Marks, {Tobin J.} and Simone Fabiano and Antonio Facchetti",
note = "Funding Information: S.W., H.S., and T.E. contributed equally to this work. The authors acknowledge the Knut and Alice Wallenberg Foundation (Tail of the Sun Project) and the Swedish Foundation for Strategic Research (Synergy project), for support of this research. S.F. gratefully acknowledges funding by VINNOVA (2015-04859), the Swedish Research Council (2016-03979), and the Advanced Functional Materials Center at Link{\"o}ping University (2009-00971). G.W. was supported by Award No. 70NANB14H012 from the U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. This work was partly supported by DFG within the CoEcfaed and Grant No. KI-1094/9 (A.K.), Grant No. FA 1502/1-1 (D.F.), as well as the Humboldt Foundation (T.E.). T.E. thanks H. Komber, L. H{\"a}u{\ss}ler, and K. Arnhold for helpful discussions. Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",
year = "2018",
month = aug,
day = "2",
doi = "10.1002/adma.201801898",
language = "English (US)",
volume = "30",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley-VCH Verlag",
number = "31",
}