Steady‐State and Transient Behavior of Organic Electrochemical Transistors

Abstract

In recent years, organic electrochemical transistors (OECTs) have emerged as attractive devices for a variety of applications, particularly in the area of sensing. While the electrical characteristics of OECTs are analogous to those of conventional organic field effect transistors, appropriate models for OECTs have not yet been developed. In particular, little is known about the transient characteristics of OECTs, which are determined by a complex interplay between ionic and electronic motion. In this paper a simple model is presented that reproduces the steady‐state and transient response of OECTs by considering these devices in terms of an ionic and an electronic circuit. A simple analytical expression is derived that can be used to fit steady‐state OECT characteristics. For the transient regime, comparison with experimental data allowed an estimation of the hole mobility in poly(3,4‐ethylenedioxythiophene) doped with poly(styrene sulfonate). This work paves the way for rational optimization of OECTs.

Detection of Glutamate and Acetylcholine with Organic Electrochemical Transistors Based on Conducting Polymer/Platinum Nanoparticle Composites

“…OECTs have been used for the detection of DNA, [24] dopamine [25] and bacteria. [26] However, most of the studies cope with the enzymatic detection of glucose with glucose oxidase using bulk platinum as gate material [27,28] . Sensitivity and limit of detection were further improved using nanomaterials (carbon nanotubes and Pt NPs) modified Pt gate electrode.…”

“…OECTs. [28] The corresponding transfer curve is presented Figure 2d. Typically, enzymatic detection with an OECT involving an oxydoreductase is done by the anodic detection of hydrogen peroxide, generated by the reoxidation of the enzyme, at a platinum gate electrode. However, cyclic voltammetry (Figure 2a) showed oxidation and reduction peaks at low potential for our composite PEDOT:PSS/Pt NPs film.…”

Toward Complementary Ionic Circuits: The npn Ion Bipolar Junction Transistor

“…addressable delivery systems for charged biomolecules. We envisage that such ionic circuits will have impact in various fields including sensors 25 , lab-on-a-chip 26 , drug delivery 27 and electrochemical components 28 .…”

Phospholipid film in electrolyte-gated organic field-effect transistors

“…Besides, OFET sensors have been shown to operate as multi-parameter devices and to deliver an amplified response [5,6]. Among organic transistor devices, interesting are the electrochemically gated OFET [7] which are capable to operate in water in the sub-volt regime. The gating is achieved in water by means of ion channels embedded into a lipid bilayer membrane interfaced to the organic semiconductor (OS) [8].…”

“…The gating is achieved in water by means of ion channels embedded into a lipid bilayer membrane interfaced to the organic semiconductor (OS) [8]. The application of a proper gate bias can trigger the opening of the ion-channels, thus allowing cations to migrate into the p-type OS and contributing to enhance the source-drain current whose amplification is therefore largely not capacitively driven [7].…”