Thermoelectric composites of poly(3-hexylthiophene) and carbon nanotubes with a large power factor

Celine Bounioux, Pablo Díaz-Chao, Mariano Campoy-Quiles, Marisol S. Martín-González, Alejandro R. Goñi, Rachel Yerushalmi-Rozen, Christian Müller

Research output: Contribution to journalArticlepeer-review

237 Scopus citations

Abstract

Composite films of poly(3-hexylthiophene) and single- as well as multi-walled carbon nanotubes are demonstrated to offer a competitive thermoelectric performance. The power factor significantly exceeds values obtained with either constituent alone provided that the conjugated polymer is sufficiently p-doped. The use of single-walled carbon nanotubes consistently results in a higher electrical conductivity with a maximum value above 10 3 S cm-1 and thus gives rise to a power factor of 25 ± 6 μW m-1 K-2 for a filler content of only 8 wt% and a maximum 95 ± 12 μW m-1 K-2 for 42-81 wt%. Moreover, a carbon nanotube content of 8-10 wt% does not compromise the low bulk thermal conductivity of the polymer matrix, which promises a high figure of merit of at least ZT > 10-2 at room-temperature. All samples are cast on plastic substrates, emphasising their suitability for large-area, flexible thermoelectric applications.

Original languageEnglish
Pages (from-to)918-925
Number of pages8
JournalEnergy and Environmental Science
Volume6
Issue number3
DOIs
StatePublished - 1 Mar 2013

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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