High-performance transistors for bioelectronics through tuning of channel thickness

Jonathan Rivnay, Pierre Leleux, Marc Ferro, Michele Sessolo, Adam Williamson, Dimitrios A. Koutsouras, Dion Khodagholy, Marc Ramuz, Xenofon Strakosas, Roisin M. Owens, Christian Benar, Jean Michel Badier, Christophe Bernard, George G. Malliaras*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

236 Scopus citations


Despite recent interest in organic electrochemical transistors (OECTs), sparked by their straightforward fabrication and high performance, the fundamental mechanism behind their operation remains largely unexplored. OECTs use an electrolyte in direct contactwith a polymer channel as part of their device structure. Hence, they offer facile integration with biological milieux and are currently used as amplifying transducers for bioelectronics. Ion exchange between electrolyte and channel is believed to take place in OECTs, although the extent of this process and its impact on device characteristics are still unknown. We show that the uptake of ions from an electrolyte into a film of poly(3,4-ethylenedioxythiophene) dopedwith polystyrene sulfonate (PEDOT:PSS) leads to a purely volumetric capacitance of 39 F/cm3. This results in a dependence of the transconductance on channel thickness, a new degree of freedom that we exploit to demonstrate high-quality recordings of human brain rhythms. Our results bring to the forefront a transistor class in which performance can be tuned independently of device footprint and provide guidelines for the design of materials that will lead to state-of-the-art transistor performance.

Original languageEnglish (US)
Article numbere1400251
JournalScience Advances
Issue number4
StatePublished - May 2015

ASJC Scopus subject areas

  • General

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