Optimizing Organic Electrochemical Transistors for Skin-Interfaced Sensors with Vertical-Corbino Structures
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초록
내용
Organic electrochemical transistors (OECTs) are widely used for skin-interfaced sensors due to their robust signal amplification, low operational voltage, and strong stability. Traditional OECTs face challenges from parasitic components that intensify with improvements. This study introduces a novel architecture with vertical-Corbino channel structures and a four-electrode potentiostat to address these issues. The vertical channels enhance transconductance up to 400 mS in short-channel formats while reducing parasitic capacitance, offering manufacturing flexibility, and increasing durability. The four-electrode configuration accurately measures intrinsic properties by eliminating parasitic potential drops. This design enables flexible skin sensors to monitor physiological muscle signals at 0.01 V with a signal-to-noise ratio of 41 dB, significantly improving non-invasive and reliable physiological signal monitoring.