Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.078
Publication date: 18th July 2023
The polyelectrolyte complex of poly(3,4-ethylene dioxythiophene) with poly(styrene sulfonate), PEDOT:PSS, is ubiquitous in the field of organic electronics. Yet, its complex structure in water and in the solid state make it challenging to understand structure-property relationships for optimization or functionalization. Our group focuses on developing a better understanding of PEDOT:PSS, particularly for using it as a mixed ionic-electronic conductor for organic electrochemical transistors (OECTs). In this talk, I will share two recent projects. The first project will describe how to increase the OECT performance of common formulations of PEDOT:PSS without sacrificing stability in water by using a surface functionalization method instead of blending with a crosslinker. For a simple formulation of PEDOT:PSS with ethylene glycol and a dodecylbenzene sulfonic acid (DBSA) surfactant, we found that surface functionalization with (3-glycidyloxypropyl)trimethoxysilane (GOPS) led to a [μC*] value of 376 ± 74 F cm‒1 V‒1 s‒1 instead of 104 ± 20 F cm‒1 V‒1 s−1 when blended with GOPS (the most commonly used approach to maintain water stability). In the second part, I will describe the use of polyethylene oxide (PEO) as either a polymeric additive to commercial formulations or as a block copolymer with PSS to increase the volumetric capacitance of PEDOT:PSS, up to 200 F cm−3 (after washing the films in water) and 120 F cm−3 respectively. When using a relatively low molecular weight PEO, 400 Da, the PEDOT:PSS:PEO blend led to a [μC*] value up to 632 F cm‒1 V‒1 s‒1 after washing with water, close to that obtained for crystalline PEDOT but without having to use sulfuric acid. For both projects, I will describe our approach for the preparation of different formulations, how the additives or block copolymers affect the chemical composition, and detailed microstructure characterization to tease out structure-property relationships in PEDOT:PSS-based mixed conductors.
This work was supported by the US National Science Foundation under grant No. DMR-2237888. ToF-SIMS analysis was performed with the instrument sponsored by the US National Science Foundation under grant No. DMR-2116754.
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