Structural origin of anisotropic transport in electrically conducting dichloroacetic acid-treated polymers

Jeffrey M. Mativetsky, Jacob Tarver, Xiaofang Yang, Bruce E. Koel, Yueh Lin Loo

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The post-deposition treatment of water-processable, polymer acid-templated conducting polymers with dichloroacetic acid has recently been shown to enhance in-plane conductivity by orders of magnitude. Here, we evaluate both the in-plane and out-of-plane conductivities of dichloroacetic acid-treated conducting polymer films, and track the accompanying evolution of film structure and composition. Films of poly(ethylene dioxythiophene)-poly(styrene sulfonic acid), PEDOT-PSS, exhibit improvements in both in-plane and out-of-plane conductivities following dichloroacetic acid treatment, associated with the removal of excess PSS from the surface. Conversely, polyaniline-poly(2- acrylamido-2-methyl-1-propanesulfonic acid), PANI-PAAMPSA, films are characterized by high anisotropies in conductivity, with the in-plane conductivity being orders of magnitude higher following DCA treatment and the out-of-plane conductivity substantially lower after the same treatment. Our experiments indicate that this unusual electrical anisotropy results from a vertically inhomogeneous composition profile.

Original languageEnglish (US)
Pages (from-to)631-638
Number of pages8
JournalOrganic Electronics
Volume15
Issue number2
DOIs
StatePublished - Feb 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Anisotropy
  • Conducting polymer
  • Electrical conductivity
  • Poly(ethylene dioxythiophene)
  • Polyaniline
  • Structure-function relationships

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