Transient Behavior of Oragnic Electrochemical Transistors Depending on Molecular Orientation of Organic Mixed Ionic Electronic Conductors
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Despite the importance of frequency-dependent characteristics of organic electrochemical transistors (OECTs), only few studies have been conducted on the structural characteristics of materials that rule the transient responses of corresponding OECTs. In this work, two mixed conducting polymers with semi-crystallinity were utilized to demonstrate the molecular orientation dependence of the ion mobility and transient behavior of OECTs. By varying co-monomer unit (2,2’-bithiophene or phenylene) used in conjuction with 1,4-dithienylphenylene-based monomer having glycol side-chain, only the molecular orientation can be controlled except ionic/electronic mixed conducting properties. By eliminating the material dependency (molecular weight, paracrystallinity) using different OECT patterning method to control the ion injection direction, the results suggested that the molecular orientation affects the length of the ion-drift pathway, resulting in different transient behavior in OECTs.