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Scalable and High-Performance Infrared Electrochromic Devices Enabled by Solvent-Engineered PEDOT/PSS Films.

Wenchao Liu1, Leipeng Zhang2, Dongqi Liu2

  • 1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

ACS Applied Materials & Interfaces
|June 10, 2025
PubMed
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This summary is machine-generated.

We developed a scalable method for flexible infrared electrochromic devices (IR-ECDs) using Poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(styrenesulfonate) (PSS). This process improves conductivity, leading to faster switching and enhanced thermal management capabilities.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Poly(3,4-ethylenedioxythiophene) (PEDOT) based infrared electrochromic devices (IR-ECDs) are promising for dynamic thermal management.
  • Current limitations include slow response, poor cycling stability, and challenges in scalable fabrication.

Purpose of the Study:

  • To develop a scalable, solution-processed strategy for fabricating large-area, flexible PEDOT/PSS IR-ECDs.
  • To improve the performance of PEDOT-based IR-ECDs through enhanced conductivity and charge transport.

Main Methods:

  • A one-step solvent post-treatment was employed to selectively remove insulating poly(styrenesulfonate) (PSS) from PEDOT/PSS films.
  • Fabrication of large-area, flexible IR-ECDs was achieved using this solution-processed strategy.
Keywords:
PEDOT/PSSdrude modelsolvent treatmentthermal radiation regulationvariable emissivity

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  • Device performance was characterized through electrochromic switching, cycling stability, and mid-infrared emissivity modulation measurements.

    • Main Results:

    • The solvent post-treatment significantly enhanced film conductivity, accelerating charge transport and enabling robust electrochromic switching.
    • The resulting devices exhibited rapid switching behavior and excellent cycling stability.
    • A notable mid-infrared emissivity modulation (Δε8-14 um) of 0.23 was achieved.

    Conclusions:

    • The study provides insights into the infrared electrochromic mechanism of PEDOT/PSS, primarily driven by conductivity changes from ion doping/dedoping.
    • When conductivity exceeds ~500 S/cm, long-wave IR reflectance aligns with Drude theory predictions.
    • This work opens avenues for scalable, cost-effective, high-performance thermal modulation technologies for applications like adaptive concealment and intelligent thermal regulation.