Publication date: 21st July 2025
Mixed conducting redox polymers have garnered significant attention in recent years for their potential usage as active layers in opto-electronic devices, bioelectronics and organic electrochemical transistors (OECTs).
Our contribution will show the electropolymerization of 3,4-ethylenedioxythiophene (EDOT) and how this method is particularly suitable for creating active layers on OECTs. The electrochemical mechanism behind electropolymerization will be explored [1] and perspectives towards applications will be discussed with the focus being the electropolymerization on OECTs directly [2] and the ways in which the material can be modified and optimized for this purpose.
Our contribution will also showcase the electrochemical study of two polymer systems, one of which focuses on carbazole-based redox polymers and the other focusing on triphenylamine-based redox polymers [3]. In-situ spectroelectrochemistry is employed to monitor the crosslinking of both the carbazole and the triphenylamine units and identify the redox active species. This crosslinking reaction significantly expands the conjugated system of both polymers which results in lower onset potentials and increased conductivities. Additionally, it becomes possible to reach higher oxidation states for these systems, from neutral to radical cation to dication. In line with these higher oxidation states are additional functionalities like an electrochromic reaction during the doping process. In our carbazole system, this colour change is from light green to dark green to black but the colour range can be adapted by chemically modifying the redox active unit. This not only has an impact on its oxidation potentials but also the colour range accessible for these systems.
The multiple advantages of these systems are combined with a wide range of possible processing methods. This includes printing or solution processing and subsequent crosslinking which leads to the growing of our redox system even in post-processing. All of this combined makes these mixed conductors particularly suitable for usage as OECT materials.
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