DOI: https://doi.org/10.29363/nanoge.cybioel.2024.001
Publication date: 28th June 2024
Almost all current understanding of the operation of organic electrochemical transistors is based on the Bernards-Malliaras model published in 2007. [1] The beauty of this model is in its simplicity, and its simplicity suggests that it may not cover all potential scenarios. Using detailed 2D semiconductor device simulations that include the ions’ electrochemistry,[2,3] we produce maps of the charge carriers (electronic & ionic) and electrochemical potential. Using steady state and time domain measurements, we could identify a better set of assumptions needed to generate an analytical model.
Unlike the traditional approach, we do not account explicitly for the ions and use the charge neutrality principle to stay in the electronic domain.
With the aid of the 2D simulations and the improved analytical model, we will present an intuitive description of the OECT operation and discuss issues like the characteristic response time, channel resistance, and the apparent threshold voltage. If time permits we will also address hysteresis effects.
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