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Spectroscopic Ellipsometry of Conducting Anisotropic Pedot thin Films.

Francesco Bisio1, Katia Sparnacci1, Angelo Angelini2

  • 1Dipartimento Di Scienze e Innovazione Tecnologica, Università degli Studi del Piemonte Orientale, Alessandria, Italy.

Macromolecular Rapid Communications
|March 30, 2026
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Summary

This study reveals that poly[3,4-ethylenedioxythiophene] (PEDOT) thin films exhibit anisotropic conductivity. Synthesized PEDOT films show enhanced in-plane optical conductivity, crucial for photonics and optical metamaterials.

Keywords:
PEDOTanisotropyconducting polymersellipsometryoptical functionsthin films

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • Poly[3,4-ethylenedioxythiophene] (PEDOT) is a conductive polymer with significant applications.
  • Understanding its anisotropic optical and electronic properties is key for advanced material design.

Purpose of the Study:

  • To comprehensively investigate the spectroscopic properties of PEDOT thin films.
  • To elucidate the relationship between molecular structure, orientation, and anisotropic conductivity.

Main Methods:

  • Variable-angle spectroscopic ellipsometry, transmittance, and reflectance measurements (UV-mid-IR).
  • Analysis using complex dielectric function and uniaxial optical modeling.
  • Grazing-incidence wide-angle X-ray scattering (GIWAXS) for structural analysis.

Main Results:

  • PEDOT films exhibit marked optical anisotropy, with higher in-plane conductivity.
  • Synthesized PEDOT films demonstrate enhanced in-plane optical conductivity compared to commercial formulations.
  • GIWAXS confirmed π-π stacking (3.9 Å) and interlamellar periodicity (15.7 Å), supporting structural anisotropy.

Conclusions:

  • The study provides a deeper understanding of PEDOT's electronic and optical properties.
  • Anisotropic behavior is linked to molecular orientation and π-π stacking.
  • Findings are relevant for the development of PEDOT in photonics and optical metamaterials.