Organic electrochemical transistors (OECTs) based on Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS) are a benchmark system in organic bioelectronics. In particular, the superior mechanical properties and the ionic-electronic transduction yield excellent potential for the field of implantable or wearable sensing technology. However, depletion-mode operation PEDOT:PSS-based OECTs cause high static power dissipation in electronic circuits, limiting their application in electronic systems. Hence, having control over the threshold voltage is of utmost technological importance. Here we demonstrate PEDOT:PSS-based dual-gate OECTs with solid-state electrolyte where the threshold voltage is seamlessly adjustable during operation. We show that the degree of threshold voltage tuning linearly depends on the gate capacitance, which is a straightforward approach for circuit designers to adjust the threshold voltage only by the device dimensions. The PEDOT:PSS-based dual-gate OECTs show excellent device performance and can be pushed to accumulation-mode operation, resulting in a simplified and relaxed design of complementary inverters.
@article{arxiv.2301.04356,
title = {Threshold Voltage Control in Dual-Gate Organic Electrochemical Transistors},
author = {Hsin Tseng and Anton Weissbach and Juzef Kucinski and Ali Solgi and Rakesh Nair and Lukas M Bongartz and Giuseppe Ciccone and Matteo Cucchi and Karl Leo and Hans Kleemann},
journal= {arXiv preprint arXiv:2301.04356},
year = {2023}
}