Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics
Artikel i vetenskaplig tidskrift, 2018

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.

oligo ethylene glycol side chains

electrical conductivity


n-type organic thermoelectrics

doping efficiency


David Kiefer

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Alexander Giovannitti

Imperial College London

Hengda Sun

Linköpings universitet

Till Biskup

Albert-Ludwigs-Universität Freiburg

Anna Hofmann

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Marten Koopmans

Camila Cendra

Stanford University

Stefan Weber

Albert-Ludwigs-Universität Freiburg

L. Jan Anton Koster

Eva Olsson

Chalmers, Fysik, Eva Olsson Group

Jonathan Rivnay

Northwestern University

Simone Fabiano

Linköpings universitet

Iain McCulloch

King Abdullah University of Science and Technology (KAUST)

Imperial College London

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi

ACS Energy Letters

23808195 (eISSN)

Vol. 3 2 278-285



Textil-, gummi- och polymermaterial

Annan fysik


Chalmers materialanalyslaboratorium





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