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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Organic electrochemical transistors (OECTs) require high-performance conjugated polymers (CPs) for channel materials, especially for n-type devices.
  • Enhancing ion incorporation and transport in the bulk of CP films is crucial for OECT performance.

Purpose of the Study:

  • To develop a novel strategy for enhancing OECT performance using postdeposition ester pyrolysis.
  • To improve ion transport and device characteristics of semiconducting polymer films.

Main Methods:

  • Synthesis of a rigid-rod polymer with thermally cleavable ester side chains.
  • Postdeposition ester pyrolysis to create nanoscale porosity, hydrophilicity, and crystallinity in the polymer film.
  • Characterization of the modified polymer films and their performance in OECT devices.

Main Results:

  • The pyrolysis process removed side chains, creating voids and increasing film porosity, hydrophilicity, and crystallinity.
  • Enhanced ion diffusion led to a superior μC* figure of merit (up to 158.85 F cm⁻¹ V⁻¹ s⁻¹).
  • Normalized transconductance increased to 31.67 S cm⁻¹, with improvements in device switching speed and long-term stability.

Conclusions:

  • Postdeposition ester pyrolysis is an effective method to create bulk porosity in CP films for OECTs.
  • Nanoscale porosity significantly benefits mixed conductivity semiconductors by enhancing ion diffusion and device performance.
  • This approach offers a pathway to high-performance, stable OECTs for various electronic applications.