Abstract
Organic electrochemical transistors (OECTs) have been widely used as transducers in electrophysiology and other biosensing applications. Their identifying characteristic is a transconductance that increases with channel thickness, and this provides a facile mechanism to achieve high signal amplification. However, little is known about their noise behavior. Here, we investigate noise and extract metrics for the signal-to-noise ratio and limit of detection in OECTs with different channel thicknesses. These metrics are shown to improve as the channel thickness increases, demonstrating that OECTs can be easily optimized to show not only high amplification, but also low noise.
Highlights
The latter is induced by a voltage applied between source and drain electrodes that make contact to the semiconductor film
This process is described by the transconductance gm 1⁄4 @Id/@Vg, which is directly linked to the ability of Organic electrochemical transistors (OECTs) to amplify recorded signals.[22]
Contrary to field-effect transistors, where changes in conductivity take place in a thin channel adjacent to the gate insulator, it is the conductivity of the entire semiconductor film that is modulated in OECTs
Summary
The latter is induced by a voltage applied between source and drain electrodes that make contact to the semiconductor film. These metrics are shown to improve as the channel thickness increases, demonstrating that OECTs can be optimized to show high amplification, and low noise.
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