Quinoid-Resonant Conducting Polymers Achieve High Electrical Conductivity over 4000 S cm−1 for Thermoelectrics

Dafei Yuan, Liyao Liu, Xuechen Jiao, Ye Zou, Christopher R. McNeill, Wei Xu, Xiaozhang Zhu, Daoben Zhu

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

New conducting polymers polythieno[3,4-b]thiophene-Tosylate (PTbT-Tos) are prepared by solution casting polymerization. Through tuning the alkyl group of TbT, the electrical conductivity can be effectively enhanced from 0.0001 to 450 S cm−1. Interestingly, the electrical conductivity of PTbT-C1-Tos increases significantly from 450 S cm−1 at room temperature to 4444 S cm−1 at 370 K, which is disparate from polyethylenedioxythiophene-Tos exhibiting metallic conducting behavior. Quasi-reversible phase transformation with temperature from 3D crystallites to lamellar-stacking coincides with the increasing electrical conductivity of PTbT-C1-Tos with heating. Methyl-substituted PTbT-Tos with the best electrical property is further utilized for thermoelectrics and a power factor as high as 263 µW m−1 K−1 is obtained. It is believed that PTbT-Tos will be a promising family of conducting polymers for solution-processed organic electronics.

Original languageEnglish
Article number1800947
Number of pages6
JournalAdvanced Science
Volume5
Issue number10
DOIs
Publication statusPublished - 1 Oct 2018

Keywords

  • conducting polymers
  • conductivity
  • organic thermoelectrics
  • phase transformation
  • quinoid resonant

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