Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.191
Publication date: 18th July 2023
Organic electrochemical transistors (OECTs) have recently been investigated intensively due to their switching and sensing functionality in an electrolytic environment which is compatible with biological systems. The working principle of OECTs differs significantly from the classical electrostatically gated field-effect transistors (FET) due the volumetric capacity control of charge carrier concentration in the channel by ionic motion. The mixed electron-ion transport of the devices has consequence for many parameters of the devices including dynamics and hysteresis. In this talk, our recent work on a better understanding of OECT operation is reviewed. We discuss the properties of a wide variety of devices including solid state electric devices and vacuum-processed devices. It turns out that entropic terms play a major role in the operation of the devices due to the entirely different statistical properties of the ions in the channel. The results show that the often observed hysteresis of OECT can be separated in an intrinsic bistable behavior and a conventional hysteresis behavior related to ion dynamics and other effects. The bistability of the devices offers interesting device applications.
I thank Matteo Cucchi, Raufar Shameem, Lukas Bongartz, Anton Weissbach, Hans Kleemann and many more for their excellent contributions.
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