The Threshold Voltage Shift of Organic Electrochemical Transistor by Charge Carrier Modulation of PEDOT:PSS channel via Chemical Crosslinking with PVA
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초록
내용
Despite the organic electrochemical transistors (OECTs) based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has drawn much attention for their potential for various applications, the PEDOT:PSS-based device consumes huge amount of energy because the devices are basically on-state. In this work, we demonstrated the charge carrier modulation of PEDOT:PSS films and the threshold voltage shift in OECTs by crosslinking with polyvinyl alcohol (PVA) as a de-dopant. With increasing PVA content, the conductivity, the volumetric capacitance, and hole concentration of film were decreased. Despite the inclusion of electrically insulating PVA in the PEDOT:PSS, the resultant OECTs showed high on-current (~1 mA), large current on/off ratio (＞103), and excellent transconductance (＞2 mS). In addition, PEDOT:PSS-PVA hybrid channel can offer tunable threshold voltage characteristics to OECTs without significant degradation in transconductance.