Influence of Channel Thickness and Counterion Composition on the Performance and Stability of Interdigitated Organic Electrochemical Transistors (OECTs) Using Electrochemically Deposited PEDOT

) (∼70 mS) and on-current levels barely changed over the examined range of channel thicknesses (100-800 nm) with both counterions. The device stability (current retention in ON/OFF cycling) and transient response times (∼10 ms) were enhanced with larger counterions, thinner channel films (∼100 nm), and lower applied drain voltages (under -0.1 V). These design insights were used to create channel-functionalized OECT-based label-free glucose sensors with high stability. These results demonstrate the ability to optimize and enhance the performance and stability of electrochemically deposited PEDOT-based interdigitated OECT devices.