Abstract
AbstractOrganic electrochemical transistors (OECTs) are widely used as amplifying transducers of biological signals due to their high transconductance and biocompatibility. For implantable applications that penetrate into tissue, OECTs need to be integrated onto narrow probes. The scarcity of real estate necessitates the use of small local gate electrodes and narrow interconnects. This work shows that both of these factors lead to a decrease in the maximum transconductance and an increase in gate voltage required to attain this maximum. This work further shows that coating the gate electrode with a thick conducting polymer improves performance. These findings help guide the development of efficient OECTs on implantable probes.
Highlights
Organic electrochemical transistors (OECTs) have been tion of the applied VG drops across the smallest capacitor
Using typical OECT structures, we showed that both issues lead to a reduction in
Materials: PEDOT:PSS (Clevios PH1000) and Micro-90 solution were purchased from Heraeus and Cole–Parmer, respectively
Summary
Organic electrochemical transistors (OECTs) have been tion of the applied VG drops across the smallest capacitor. As the signal is transduced, its power is amplified by a factor that gate electrodes, add complexity to the fabrication process, make biofunctionalization difficult, and preclude use in implantable applications Another particularity of OECTs is depends on the transconductance, gm = ∂ID/∂VG.[15] An iden- that they draw a large drain current, as the entire thickness of tifying characteristic of OECTs is that changes in doping take the channel (as opposed to a thin interfacial region in FETs) place throughout the entire volume of the channel, contrary to is involved in electronic carrier transport between source and field-effect transistors (FETs), in which doping changes only drain.[19] This can lead to a significant fraction of the applied drain and gate voltage dropping on the interconnects[20,21]
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