Hysteresis in Organic Electrochemical Transistors: Relation to the Electrochemical Properties of the Semiconductor

The ability to bridge ionic and electronic transport coupled with large volumetric capacitance renders organic electrochemical transistors (OECTs) ideal candidates for bioelectronic applications. Adopting ionic-liquid-based solid electrolytes extends their applicability facilitates large-area printable productions. However, OETCs employing tend show a pronounced hysteresis in the transfer curve. A detailed understanding of is crucial accurate characterizations reliable Here, we demonstrated fully photopatternable poly(3,4-ethylenedioxythiophene):tosylate (PEDOT:Tos)- based OECTs incorporating liquid [EMIM][EtSO4] electrolyte (SE). PEDOT:Tos films deposited through vapor phase polymerization (VPP) were annealed different durations after step. Upon rinsing ethanol deposition SE, made these showed impressive bias stress stability under prolonged operation cycles, high switching ratio, low threshold voltage, transconductance. Furthermore, by taking measurements sweep rates, revealed two distinct regimes hysteresis: kinetic non-kinetic hysteresis. We observed changes annealing. Finally, impedance spectroscopy exhibited that turned from Faradaic non-Faradaic response annealing, explaining both regimes.