N -Alkyl substituted 1 H -benzimidazoles as improved n-type dopants for a naphthalene-diimide based copolymer

B. Saglio, M. Mura, M. Massetti, F. Scuratti, D. Beretta, X. Jiao, C. R. McNeill, M. Sommer, A. Famulari, G. Lanzani, M. Caironi, C. Bertarelli

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Doped polymer semiconductors are actively studied for opto- and micro-electronic applications including thermoelectric generators, where a high electrical conductivity is a key factor. In general, n-type doping is more challenging to achieve than p-type doping. Here we study n-type doping of a commonly used electron transporting naphthalene-diimide bithiophene copolymer with a series of air-stable and solution-processable benzimidazole dopants. To understand the role of dopant structure on miscibility and the resulting conductivity, benzimidazoles with different linear and branched alkyl substituents were synthesized, and their doping efficacy compared through combined morphological, electrical and thermoelectric characterization. We observe a clear dependence of the nature of the alkyl substituent on dopant intercalation into the semicrystalline morphology. By increasing the length or the steric hindrance of the alkyl substituents, the miscibility between dopant and copolymer is enhanced leading to optimized electrical conductivity.

Original languageEnglish
Pages (from-to)15294-15302
Number of pages9
JournalJournal of Materials Chemistry A
Issue number31
Publication statusPublished - 21 Aug 2018

Cite this

Saglio, B., Mura, M., Massetti, M., Scuratti, F., Beretta, D., Jiao, X., McNeill, C. R., Sommer, M., Famulari, A., Lanzani, G., Caironi, M., & Bertarelli, C. (2018). N -Alkyl substituted 1 H -benzimidazoles as improved n-type dopants for a naphthalene-diimide based copolymer. Journal of Materials Chemistry A, 6(31), 15294-15302. https://doi.org/10.1039/c8ta04901g