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2-D Drift-Diffusion Simulation of Organic Electrochemical Transistors | IEEE Journals & Magazine | IEEE Xplore

2-D Drift-Diffusion Simulation of Organic Electrochemical Transistors


Abstract:

A 2-D device model of the organic electrochemical transistor is described and validated. Devices with channel length in range 100 nm-10 mm and channel thickness in range ...Show More

Abstract:

A 2-D device model of the organic electrochemical transistor is described and validated. Devices with channel length in range 100 nm-10 mm and channel thickness in range 50 nm-5 μm are modeled. Steady-state, transient, and AC simulations are presented. Using the realistic values of physical parameters, the results are in good agreement with the experiments. The scaling of transconductance, bulk capacitance, and transient responses with device dimensions is well reproduced. The model reveals the important role of the electrical double layers in the channel, and the limitations of device scaling.
Published in: IEEE Transactions on Electron Devices ( Volume: 64, Issue: 12, December 2017)
Page(s): 5114 - 5120
Date of Publication: 10 October 2017

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I. Introduction

The organic electrochemical transistor (OECT) [1], is a transistor with a channel allowing both ionic and electronic conduction. PEDOT:PSS is the typically used organic mixed ionic-electronic conductor. The channel is in contact with an electrolyte. The transistor current in the channel is modulated by ions injected from the electrolyte into the channel. The ions can enter and leave the transistor channel, and they can be transported inside it. OECT exhibits the typical characteristics of a depletion field effect transistor, in which the electrolyte has the role of the gate electrode [1], [2]. The length of the channel varies between few micrometers [3] to millimeters [4]. Compared with other technologies, the transconductance of OECTs can be higher than of electrolyte- and ionic liquid-gated transistors, and transistors based on silicon, oxide-gated graphene, and ZnO [3]. Although slower than its inorganic counterparts, the response time can be fast enough for amplifying neural signals [5]. This makes OECT a promising device for bioelectronic sensing applications [6], [7].

References

References is not available for this document.