Structural Alternation Correlated to the Conductivity Enhancement of PEDOT:PSS Films by Secondary Doping

Keisuke Itoh, Yoshihisa Kato, Yuta Honma, Hiroyasu Masunaga, Akihiko Fujiwara, Satoshi Iguchi, Takahiko Sasaki

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

"Secondary doping" in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is quite effective and a frequently used method for the conductivity enhancement. This simple approach, the addition of co-solvents to the PEDOT:PSS solution before film fabrication, is an essential way to derive the high electrical performance of PEDOT:PSS, but the mechanism still remains unclear. In this study, nanoscale structural changes synchronized with the conductivity enhancement via secondary doping in PEDOT:PSS films were investigated. During secondary doping with ethylene glycol near the critical dopant concentration, noncrystalized PEDOT molecules uncoupled from PSS chains and then underwent nanocrystallization. These structural changes might be the key driving force for conductivity enhancement via secondary doping.

Original languageEnglish
Pages (from-to)13467-13471
Number of pages5
JournalJournal of Physical Chemistry C
Volume123
Issue number22
DOIs
Publication statusPublished - 2019 Jun 6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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