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<p>In this study, the effect of thermal and UV-ozone/ozone-induced oxidation on the electrical conductivity of poly(2,3-dihydrothieno-1,4-dioxin)-poly(styrenesulfonate) (PEDOT:PSS) film was systematically studied by varying two dry oxidation mechanisms: annealing of PEDOT:PSS from 120 to 240&#xa0;°C and UV-ozone/ozone exposures at different time intervals (i.e., 0 to 32&#xa0;min). The comparative maximum electrical conductivity was achieved in the 200 to 240&#xa0;°C annealing range, with conductivity showing a dynamic, complex dependence on temperature: initial reduction at lower temperatures, followed by a dramatic increase around 200&#xa0;°C, and subsequent saturation at 220–240&#xa0;°C. This behavior is attributed to the temperature’s influence on the organization and cross-linking/alignment of polymer chains. However, the high conductivity achieved at 240&#xa0;°C significantly degraded within five days, contrasting with the more stable conductivity observed for films annealed at 150&#xa0;°C and 200&#xa0;°C. On the other hand, both UV–ozone and pure ozone treatments increased the surface energy and work function of the polymer; however, the rate of increase in surface energy was higher for UV–ozone, while the rate of increase in work function was higher for ozone-only exposure. Such changes in electronic and surface properties are likely driven by UV/ozone-induced oxidation and the resulting cross-linking within the material. The findings offer new insights into the oxidation-driven modifications of PEDOT:PSS, providing strategies to precisely tailor its electronic and surface properties for enhanced optoelectronic device performance.</p> Graphical Abstract <p></p>

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Impact of oxidation on the electrical and surface property of PEDOT:PSS

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Sentayehu Yigzaw,
  • Nika Bekri,
  • Assaye Gedifew,
  • Desalegn Alemu,
  • Toshinori Matsushima,
  • Amare Benor

摘要

In this study, the effect of thermal and UV-ozone/ozone-induced oxidation on the electrical conductivity of poly(2,3-dihydrothieno-1,4-dioxin)-poly(styrenesulfonate) (PEDOT:PSS) film was systematically studied by varying two dry oxidation mechanisms: annealing of PEDOT:PSS from 120 to 240 °C and UV-ozone/ozone exposures at different time intervals (i.e., 0 to 32 min). The comparative maximum electrical conductivity was achieved in the 200 to 240 °C annealing range, with conductivity showing a dynamic, complex dependence on temperature: initial reduction at lower temperatures, followed by a dramatic increase around 200 °C, and subsequent saturation at 220–240 °C. This behavior is attributed to the temperature’s influence on the organization and cross-linking/alignment of polymer chains. However, the high conductivity achieved at 240 °C significantly degraded within five days, contrasting with the more stable conductivity observed for films annealed at 150 °C and 200 °C. On the other hand, both UV–ozone and pure ozone treatments increased the surface energy and work function of the polymer; however, the rate of increase in surface energy was higher for UV–ozone, while the rate of increase in work function was higher for ozone-only exposure. Such changes in electronic and surface properties are likely driven by UV/ozone-induced oxidation and the resulting cross-linking within the material. The findings offer new insights into the oxidation-driven modifications of PEDOT:PSS, providing strategies to precisely tailor its electronic and surface properties for enhanced optoelectronic device performance.

Graphical Abstract