The authors acknowledge useful comments and discussions with John DeFranco, Matthew Lloyd, Jeff Mabeck, and Jason Slinker. This work was supported by the Center for Nanoscale Systems (CNS) and the Cornell Nanofabrication Facility (CNF). D. A. B. is supported by a National Defense Science and Engineering Graduate Fellowship.
Steady-State and Transient Behavior of Organic Electrochemical Transistors†
Article first published online: 16 OCT 2007
Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 17, Issue 17, pages 3538–3544, November, 2007
How to Cite
Bernards, D. A. and Malliaras, G. G. (2007), Steady-State and Transient Behavior of Organic Electrochemical Transistors. Adv. Funct. Mater., 17: 3538–3544. doi: 10.1002/adfm.200601239
- Issue published online: 22 NOV 2007
- Article first published online: 16 OCT 2007
- Manuscript Revised: 13 MAR 2007
- Manuscript Received: 22 DEC 2006
- Center for Nanoscale Systems (CNS)
- Cornell Nanofabrication Facility (CNF)
- Conducting polymers;
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.