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Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics
Chalmers Univ Technol, Sweden.
Imperial Coll London, England.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
Albert Ludwigs Univ Freiburg, Germany.
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2018 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 3, no 2, p. 278-285Article in journal (Refereed) Published
Abstract [en]

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 mu W K-2 m(-1) compared to other NDI-based polymers.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 3, no 2, p. 278-285
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-145790DOI: 10.1021/acs.energy.lett.7b01146ISI: 000425560900003OAI: oai:DiVA.org:liu-145790DiVA, id: diva2:1192403
Note

Funding Agencies|Swedish Research Council [2016-06146, 2016-03979]; Knut and Alice Wallenberg Foundation through a Wallenberg Academy Fellowship, and the European Research Council (ERC) [637624]; VINNOVA [2015-04859]

Available from: 2018-03-22 Created: 2018-03-22 Last updated: 2018-03-22

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  • apa
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