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Vapor Phase Deposition of Electroactive Poly(3,4-ethylenedioxythiophene) onto Electrospun Commodity Polymer Nanofibers
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Increase in electron scattering length in PEDOT:PSS by a triflic acid post-processing.

Dominik Farka1, H Coskun1, P Bauer2

  • 1Linz Institute for Organic Solarcells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria.

Monatshefte Fur Chemie
|May 2, 2017
PubMed
Summary

Researchers developed a new doping method for poly-3,4-ethylenedioxythiophene (PEDOT) to create transparent, highly conductive electrodes. This advancement offers a promising alternative to indium tin oxide (ITO) for optoelectronic devices.

Keywords:
Anderson localizationConductive metallic polymersInfrared transparencyMott–Ioffe–Regel limitTransparent conductive electrodes

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • Transparent conductive electrodes are crucial for optoelectronic devices like solar cells and LEDs.
  • Indium tin oxide (ITO) is the standard, but its limitations drive the search for alternatives.
  • Conductive polymers offer a promising avenue for next-generation transparent electrodes.

Purpose of the Study:

  • To develop a novel doping strategy for poly-3,4-ethylenedioxythiophene (PEDOT) to enhance its conductivity and transparency.
  • To investigate the potential of a modified PEDOT:PSS material as a viable alternative to ITO.
  • To characterize the electrical and physical properties of the resulting conductive polymer.

Main Methods:

  • Utilized a commercial high conductivity PEDOT:PSS (Clevios PH 1000) as the base material.
  • Applied a post-processing step involving aqueous triflic acid for doping.
  • Measured electrical resistivity, transparency, and magnetoconductance at low temperatures (1.8-10 K).

Main Results:

  • Achieved a highly conductive and transparent material with a resistivity of 5.23 × 10^-4 Ω cm.
  • Demonstrated stable conductivity over a wide temperature range, indicating metallic behavior.
  • Observed positive magnetoconductance effects and extended electron mean free paths, confirming a metallic state.

Conclusions:

  • The novel doping strategy successfully produced a transparent conductive polymer with excellent electrical properties.
  • The modified PEDOT material exhibits metallic behavior and stability, making it a strong candidate to replace ITO.
  • This research opens new possibilities for advanced optoelectronic device applications using conductive polymers.