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O: Fachverband Oberflächenphysik
O 24: Solid-liquid interfaces: Reactions and electrochemistry – Poster
O 24.8: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Mediator-Induced Interfacial Perturbations in Mixed Ionic--Electronic Transport of OECT Systems — •Yanfei Gao1,2, Pascal Gausmann1,2, Song Zhao1,3, Ronja Thümmler1,3, Qiong Li1, Ningwei Sun1, and Franziska S.-C. Lissel1,2 — 1Leibniz Institute for Polymer Research Dresden, Dresden, Germany — 2Technische Universität Hamburg, Institute for Applied Polymer Physics, Hamburg, Germany — 3Technische Universität Dresden, Faculty of Chemistry and Food Chemistry, Dresden, Germany
Organic electrochemical transistors (OECTs) provide a unique platform for probing the coupling between ionic and electronic transport in organic semiconductors. However, how interfacial functionalization can reshape channel transport remains insufficiently understood, particularly under bio-coupled conditions. Here, we introduce a mediator-based interfacial design concept for electrolyte*organic semiconductor systems incorporating amine-reactive functionality. Structural and electrical characterization verify the presence of the mediator and reveal modest modifications of steady-state transport characteristics. Notably, the mediator induces mesoscale interfacial organization that actively participates in reshaping channel transport. Time-resolved measurements across two enzyme-based systems demonstrate reproducible modulation of channel response, highlighting the involvement of mediator-assisted interfacial processes in mixed ionic*electronic transport. These results point to interfacial electronic structure and mesoscale organization as important factors in bio-coupled charge transport in OECT systems.