Dresden 2026 – scientific programme

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BP: Fachverband Biologische Physik

BP 23: Biopolymers, Biomaterials and Bioinspired Functional Materials I (joint session CPP/BP)

BP 23.5: Talk

Wednesday, March 11, 2026, 16:15–16:30, ZEU/0255

A universal material basis for biocompatible printed electrolytes in Organic Electrochemical Transistors (OECTs) — •Moritz Flemming, Paul Zechel, Rakesh Nair, Laura Teuerle, Hans Kleemann, and Karl Leo — Institute of Applied Physics, Technische Universität Dresden

Organic Electrochemical Transistors (OECTs) stand out for their interplay between ionic and electronic conduction, making them ideal analogues to biological synapses for neuromorphic computing or biosensors. Furthermore, they can be printed into integrated circuits on flexible substrates, allowing for low-cost and high throughput fabrication of full electronic systems. However, most OECT electrolytes for integrated circuits still lack biocompatibility and suffer from rheology-related printing challenges. This talk presents a novel material basis that can be combined with an ionic liquid to fabricate a biocompatible electrolyte for OECTs. It allows rheological adjustments to enable the use of electrolyte in both inkjet and screen printing. Furthermore, the electrolyte is UV-curable, enabling it to transition into solid-state structures after printing. Extended ink and device lifetimes for screen-printed structures enable the fabrication of state-of-the-art OECTs that can operate in ambient air more than 30 days after fabrication. Ultimately, a fully biocompatible and screen-printed OECT on a leaf substrate is demonstrated.

Keywords: Screen printing; Inkjet printing; OECT; Electrolyte