DataVXACS Energy LettersPaper
journal article·2018-02-09Open access

Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics

David Kiefer, Alexander Giovannitti, Hengda Sun, Till Biskup, Anna Hofmann, Marten Koopmans, Camila Cendra, Stefan Weber, L. Jan Anton Koster, Eva Olsson, Jonathan Rivnay, Simone Fabiano, Iain McCulloch, Christian Müller

ACS Energy Letters· Volume 3· Issue 2
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Abstract

High Resolution Image Download MS PowerPoint Slide N-doping of conjugated polymers either requires a high dopant fraction or yields a low electrical conductivity because of their poor compatibility with molecular dopants. We explore n-doping of the polar naphthalenediimide–bithiophene copolymer p(gNDI-gT2) that carries oligoethylene glycol-based side chains and show that the polymer displays superior miscibility with the benzimidazole–dimethylbenzenamine-based n-dopant N-DMBI. The good compatibility of p(gNDI-gT2) and N-DMBI results in a relatively high doping efficiency of 13% for n-dopants, which leads to a high electrical conductivity of more than 10 –1 S cm –1 for a dopant concentration of only 10 mol % when measured in an inert atmosphere. We find that the doped polymer is able to maintain its electrical conductivity for about 20 min when exposed to air and recovers rapidly when returned to a nitrogen atmosphere. Overall, solution coprocessing of p(gNDI-gT2) and N-DMBI results in a larger thermoelectric power factor of up to 0.4 μW K –2 m –1 compared to other NDI-based polymers.
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Research context

Polymers

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden

Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, United Kingdom

Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 601 74 Norrköping, Sweden

Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany

Zernike Institute for Advanced Materials, 9747 AG Groningen, The Netherlands

Department of Materials Science and Engineering, Stanford University, Stanford, California 94304, United States

Department of Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden

Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60035, United States

SPERC, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia

Funding

Vetenskapsr?det · VINNOVA · Knut och Alice Wallenbergs Stiftelse · H2020 European Research Council

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