Elucidating the Mixed Ionic and Electronic Transport Mechanism of Conjugated Polyelectrolytes by Doping through Organic Electrochemical Transistor
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Conjugated polyelectrolytes (CPEs) exhibit a mixed conductivity composed of π-conjugated backbone and pendant ionic functionalities. This novel structure allows a self-doping process which the polarons are delocalized through the backbone. These CPEs have a wide range of applications like solar cell and organic electronics. In this work, electronic and ionic transport is studied with OECT system by fabricating different CPEs as a channel material. Through comparing the different polarity of side chains but same backbone, the effect of the side chain was studied precisely. Not only comparing different channel material, different types (aqueous & quasi-solid ionic liquid) of electrolytes were applied for electrochemical doping. Mixed transport mechanism was compared by measuring transfer/output curve, μC* value and response time etc. Our work allows for maximizing doping effect by clarifying mechanism and able to utilize in various applications in different conditions.