Switching Response in Organic Electrochemical Transistors by Ionic Diffusion and Electronic Transport
Bisquert J. Ilyassov B. Tessler N.
25 September 2024John Wiley and Sons Inc
Advanced Science
2024#11Issue 36
The switching response in organic electrochemical transistors (OECT) is a basic effect in which a transient current occurs in response to a voltage perturbation. This phenomenon has an important impact on different aspects of the application of OECT, such as the equilibration times, the hysteresis dependence on scan rates, and the synaptic properties for neuromorphic applications. Here we establish a model that unites vertical ion diffusion and horizontal electronic transport for the analysis of the time-dependent current response of OECTs. We use a combination of tools consisting of a physical analytical model; advanced 2D drift-diffusion simulation; and the experimental measurement of a poly(3-hexylthiophene) (P3HT) OECT. We show the reduction of the general model to simple time-dependent equations for the average ionic/hole concentration inside the organic film, which produces a Bernards-Malliaras conservation equation coupled with a diffusion equation. We provide a basic classification of the transient response to a voltage pulse, and the correspondent hysteresis effects of the transfer curves. The shape of transients is basically related to the main control phenomenon, either the vertical diffusion of ions during doping and dedoping, or the equilibration of electronic current along the channel length.
hysteresis , ionic diffusion , organic transistor , switching , transient
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Instituto de Tecnología Química (Universitat Politècnica de València-Agencia Estatal Consejo Superior de Investigaciones Científicas), Av. dels Tarongers, València, 46022, Spain
Institute of Advanced Materials (INAM), Universitat Jaume I, Castelló, 12006, Spain
Astana IT University, Mangilik El 55/11, EXPO C1, Astana, 010000, Kazakhstan
Andrew & Erna Viterbi Department of Electrical and Computer Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
Instituto de Tecnología Química (Universitat Politècnica de València-Agencia Estatal Consejo Superior de Investigaciones Científicas)
Institute of Advanced Materials (INAM)
Astana IT University
Andrew & Erna Viterbi Department of Electrical and Computer Engineering
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