[3PS-239]
Choline-Based Ionic Liquid for Long-Term Stability in Organic Electrochemical Transistors
발표자정주연 (성균관대학교)
연구책임자김태일 (성균관대학교)
Abstract
Organic electrochemical transistors (OECTs) are promising for biointegrated sensing, but their longevity is often hindered by electrolyte dehydration. We present an OECT platform utilizing a choline acetate ([Ch][Ace]) ionic liquid in both the channel and electrolyte, comprising [Ch][Ace]-infused PEDOT:PSS (CLiPS) and a [Ch][Ace]–gelatin ionic gel (CAGel). The diffusion of [Ch][Ace] into the channel induces PSS- screening and dedoping, shifting the peak transconductance bias to 0 V without compromising performance. These devices exhibit a competitive transconductance of ~50 mS and ultrafast switching of ~80 ns. Due to CAGel’s high ionic conductivity (17.1 mS cm^-1) and low volatility, the OECTs operate stably for over 3 months under ambient conditions. This approach enables 3D-integrated 9×9 arrays with high on/off ratios (>10^5) and facilitates high-fidelity, long-term ECG/EMG recording.