High-Gain Chemically Gated Organic Electrochemical Transistor

Siew Ting Melissa Tan, Alexander Giovannitti, Armantas Melianas, Maximilian Moser, Benjamin L. Cotts, Devan Singh, Iain McCulloch, Alberto Salleo

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Organic electrochemical transistors (OECTs) have exhibited promising performance as transducers and amplifiers of low potentials due to their exceptional transconductance, enabled by the volumetric charging of organic mixed ionic/electronic conductors (OMIECs) employed as the channel material. OECT performance in aqueous electrolytes as well as the OMIECs’ redox activity has spurred a myriad of studies employing OECTs as chemical transducers. However, the OECT's large (potentiometrically derived) transconductance is not fully leveraged in common approaches that directly conduct chemical reactions amperometrically within the OECT electrolyte with direct charge transfer between the analyte and the OMIEC, which results in sub-unity transduction of gate to drain current. Hence, amperometric OECTs do not truly display current gains in the traditional sense, falling short of the expected transistor performance. This study demonstrates an alternative device architecture that separates chemical transduction and amplification processes on two different electrochemical cells. This approach fully utilizes the OECT's large transconductance to achieve current gains of 103 and current modulations of four orders of magnitude. This transduction mechanism represents a general approach enabling high-gain chemical OECT transducers.

Original languageEnglish (US)
Article number2010868
JournalAdvanced Functional Materials
Volume31
Issue number19
DOIs
StatePublished - May 10 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Condensed Matter Physics
  • Electrochemistry

Keywords

  • chemical to electrical transduction
  • electrochemistry
  • high gain transistors
  • organic mixed ionic/electronic conductors

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