Improvement of electrical conductivity of poly(3,4-ethylenedioxythiophene) (PEDOT) thin film

Seong Hun Yu, Jae Hak Lee, Myong Soo Choi, Jong Hyeok Park, Pil J. Yoo, Jun Young Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


In order to improve the electrical conductivity of in-situ polymerized poly(3,4-ethylenedioxythiophene) (PEDOT) thin film, we investigated the effect of doping level and co-dopant on the electrical conductivity. Doping level of PEDOT thin film was determined by X-ray photoelectron spectroscopy (XPS) and it was found that the higher doping level led to higher electrical conductivity. We also used several kinds of codopants such as methanesulfunic acid, naphthalenesulfonic acid and p-toluenesulfonic acid to increase the conductivity of PEDOT. When methanesulfonic acid was used as co-dopant, electrical conductivity of PEDOT thin film increased up to 1,500 S/cm. It is considered that the enhanced conductivity resulted from higher interchain conduction or more expanded chain structure due to small dopant size of methanesulfunic acid.

Original languageEnglish
Pages (from-to)76-82
Number of pages7
JournalMolecular Crystals and Liquid Crystals
Issue number1
Publication statusPublished - 2013 Sept 1

Bibliographical note

Funding Information:
This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) grants funded by the Korea government (Ministry of Education, Science and Technology) (2010-0029410, 2010-0026281, 2010-0010643).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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