Abstract
Organic electrochemical transistors (OECTs) have shown promise as transducers and amplifiers of minute electronic potentials due to their large transconductances. Tuning the OECT threshold voltage is important to achieve low-powered devices with amplification properties within the desired operational voltage range. However, traditional design approaches have struggled to decouple channel and materials properties from threshold voltage, thereby compromising on several other OECT performance metrics, such as electrochemical stability, transconductance, and dynamic range. In this work, simple solution-processing methods are utilized to chemically dope polymer gate electrodes, thereby controlling their work function, which in turn tunes the operation voltage range of the OECTs without perturbing their channel properties. Chemical doping of initially air-sensitive polymer electrodes further improves their electrochemical stability in ambient conditions. Thus, OECTs that are simultaneously low-powered and electrochemically resistant to oxidative side reactions under ambient conditions are demonstrated. This approach shows that threshold voltage, which is once interwoven with other OECT properties, can in fact be an independent design parameter, expanding the design space of OECTs.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2202359 |
| Journal | Advanced Materials |
| DOIs | |
| State | Published - Jun 23 2022 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2022-09-14Acknowledged KAUST grant number(s): OSR-2019-CRG8-4086
Acknowledgements: S.T.M.T. and G.L. contributed equally to this work. The authors thank the Dionne lab for access to their UV–vis spectrometer. S.T.M.T. gratefully acknowledges financial support from the National Science Foundation, CBET Award# 1804915, and from the Stanford Graduate Fellowship (Chevron Fellowship). A.G. and A.S. acknowledge funding from the TomKat Center for Sustainable Energy at Stanford University. A.S. acknowledges financial support from the National Science Foundation, DMR Award# 1808401. Part of this work was performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under award ECCS–1542152. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515. S.G. and I.M. acknowledge financial support from KAUST Office of Sponsored Research (OSR) award no. OSR-2019-CRG8-4086. S.G. and I.M. acknowledge funding from the European Union's Horizon 2020 research and innovation program under grant agreement n°952911, project BOOSTER and grant agreement n°862474, project RoLA-FLEX, as well as EPSRC Project EP/T026219/1.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.