Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.274
Publication date: 18th July 2023
Engineering conjugated polymers with glycol-based side chains has been the main strategy used to improve the performance of mixed ionic-electronic conductors (OMIECs), a promising material class for interfacing biological systems with electronics. Organic electrochemical transistors (OECTs) are a solution for this task and are often used to benchmark OMIECs performance. Different studies have showed that polymers designed with hydrophilic solubilizing chains show better OECT performance, mostly due to their higher ionic uptake and stability in aqueous environments. [1]
In this work, we explore how side chain engineering in poly(3-hexylthiophene) (P3HT) and in indacenodithiophene-co-benzothiadiazole (IDTBT) impact their ionic transport properties. We used time-resolved spectroelectrochemistry to measure the kinetics of doping in these materials with high time resolution. We observe that for thicker films (around 100-200 nm), the films with more glycol content are doped faster, confirming that the ion transport is better in more polar polymers. However, for thinner films (around 20nm), we observe that the kinetics becomes independent of glycol content. We hypothesize that the kinetics in thin films are less dependent on the ion transport and closer to the electrochemical limit. Therefore, the polar content does not affect the intrinsic electrochemical reactions rate and the doping favorability, which remain controlled by the polymer backbone.
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