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High interchain ordering of poly(3,4-ethylenedioxythiophene) (pEDOT) is not essential for efficient charge transport. Even disordered pEDOT films achieve low resistance once percolation is reached, simplifying charge transport studies.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Conductive Polymers

Background:

  • Efficient charge transport in conductive polymers like poly(3,4-ethylenedioxythiophene) (pEDOT) is often linked to high interchain ordering.
  • Understanding the relationship between polymer structure and electrical properties is crucial for developing advanced electronic materials.

Purpose of the Study:

  • To investigate whether high interchain ordering is a prerequisite for efficient charge transport in pEDOT.
  • To decouple polymerization and ordering steps to study charge transport development during synthesis.

Main Methods:

  • Decoupling polymerization and ordering into separate processing stages.
  • Utilizing Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) to measure interchain order.
  • Correlating GIWAXS data with in-situ resistivity measurements on single polymer films.

Main Results:

  • High levels of interchain ordering in pEDOT are not necessary for efficient charge transport.
  • Percolation, enabling charge transport, can be achieved in highly disordered pEDOT films.
  • A low pEDOT volume fraction (4.5%) is sufficient for percolation.

Conclusions:

  • The development of charge transport during pEDOT polymerization can be meaningfully studied without requiring significant interchain ordering.
  • This finding challenges conventional understanding and offers new pathways for processing conductive polymers.
  • Efficient charge transport in pEDOT is primarily governed by achieving percolation, not long-range order.