Issue 36, 2021

Operation mechanism of organic electrochemical transistors as redox chemical transducers

Abstract

The ability to control the charge density of organic mixed ionic electronic conductors (OMIECs) via reactions with redox-active analytes has enabled applications as electrochemical redox sensors. Their charge density-dependent conductivity can additionally be tuned via charge injection from electrodes, for instance in organic electrochemical transistors (OECTs), where volumetric charging of the OMIEC channel enables excellent transconductance and amplification of low potentials. Recent efforts have combined the chemical detection with the transistor function of OECTs to achieve compact electrochemical sensors. However, these sensors often fall short of the expected amplification performance of OECTs. Here, we investigate the operation mechanism of various OECT architectures to deduce the design principles required to achieve reliable chemical detection and signal amplification. By utilizing a non-polarizable gate electrode and conducting the chemical reaction in a compartment separate from the OECT, the recently developed Reaction Cell OECT achieves reliable modulation of the OECT channel's charge density. This work demonstrates that systematic and rational design of OECT chemical sensors requires understanding the electrochemical processes that result in changes in the potential (charge density) of the channel, the underlying phenomenon behind amplification.

Graphical abstract: Operation mechanism of organic electrochemical transistors as redox chemical transducers

Supplementary files

Article information

Article type
Paper
Submitted
13 May 2021
Accepted
25 Jul 2021
First published
02 Aug 2021

J. Mater. Chem. C, 2021,9, 12148-12158

Operation mechanism of organic electrochemical transistors as redox chemical transducers

S. T. M. Tan, S. Keene, A. Giovannitti, A. Melianas, M. Moser, I. McCulloch and A. Salleo, J. Mater. Chem. C, 2021, 9, 12148 DOI: 10.1039/D1TC02224E

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