Health & Biomedical Sciences Faculty Publications
Document Type
Article
Publication Date
6-9-2026
Abstract
Organic Electrochemical Transistors (OECTs) are promising candidates for low-voltage bioelectronic systems due to their high transconductance, mixed ionic–electronic transport, and compatibility with flexible substrates. In this work, we investigate the electrochemical transport, gate leakage, and transconductance behavior of screen-printed PEDOT:PSS OECTs, with emphasis on the relationship between ionic coupling and output characteristics. Key electrical and electrochemical parameters—including drain current modulation, transconductance evolution, gate current behavior, and capacitance–voltage response—were systematically analyzed to elucidate the mechanisms governing device operation. The results reveal clear trade-offs between parasitic resistance, volumetric electrochemical capacitance, and effective gate control, which in turn influence signal integrity and amplification efficiency. Devices exhibiting reduced parasitic effects demonstrated lower gate leakage, improved signal-to-noise ratio, and more stable transconductance, whereas devices with stronger ionic coupling showed enhanced drain current at the expense of nonlinearity in the saturation regime. High-frequency C–V measurements and gate-current modeling further confirm distinct electrochemical dynamics driven by modulation of mixed conduction pathways. These insights provide a deeper understanding of OECT operation and offer practical guidelines for optimizing device architecture in solid-state and flexible bioelectronic applications.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Publication Title
ECS Journal of Solid State Science and Technology
DOI
10.1149/2162-8777/ae7642
Included in
Biomedical Engineering and Bioengineering Commons, Electrical and Computer Engineering Commons, Medicine and Health Sciences Commons
Comments
© 2026 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, https://creativecommons.org/licenses/ by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/ 2162-8777/ae7642