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A8.04 - High Performance Organic Transistors for Human Brain Recordings 
December 3, 2014   3:30pm - 3:45pm

Organic electrochemical transistors that utilize conducting polymer films as the channel have shown considerable promise as amplifying transducers for electrophysiology. Efficient local transduction of biological signals is of critical importance for applications in detection and mapping of brain activity in order to better understand both physiological and pathological states. The physics of organic electrochemical transistors, however, remains largely unexplored which subsequently prohibits their optimization and limits their utility. Here we show that the uptake of ionic charge from an electrolyte into a poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonate (PEDOT:PSS) film leads to a dependence of the effective capacitance on the entire volume of the film. We find that both the transconductance and the response time scale with channel geometry, and present a model that describes this scaling. Electrochemical transistors, therefore, present a new degree of freedom in addressing the tradeoff between gain and bandwidth, which allows the engineering of devices optimized for high frequency recordings of individual action potentials, as well as for low-frequency, network-level rhythms typical of electroencephalography. These devices show an exceptionally high transconductance of 3-10 mS and lead to high fidelity human brain recordings.

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