Abstract
Organic electrochemical transistors (OECTs) are emerging as next-generation bioelectronic devices and neuromorphic systems. In OECTs, permeation of mobile ions from an electrolyte leads to changes in bulk conductivity of the channel. The channel materials are typically organic mixed ionic-electronic conductors (OMIECs), which exhibit high performance in both electronic and ionic transport. Among these OMIECs, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is the most widely used. However, there have been ambiguities regarding the electrochemical doping process of PEDOT:PSS. This study aims to elucidate these ambiguities by investigating the ion dependence of the electrochemical doping process.
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