<em>Comparison of Mobility (μ) and Volumetric Capacitance (C<sup>*</sup>) in Napthalenediimide-Based Polymer and Perylene Diimide-Based Polymer</em>
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The electrochemical doping process in an organic electrochemical transistor (OECT) is that when the gate voltage is applied to the electrode, ions penetration from an electrolyte to a polymer film occurs and modulates its conductivity. In general, having a high electron or hole mobility (μ) and high volumetric capacitance (C*) for effective ion penetration is the requirement for OECT channel material. We utilized two different backbone polymers as active materials in OECTs. One is a Perylene Diimide (PDI)-based polymer with an amorphous structure and the other is a Napthalenediimide (NDI)-based polymer with a crystalline structure. The crystallinity of the polymer film influences the mobility of ions and carriers. Highly crystalline films lead to poor ionic transport restricting ion penetration into a polymer film. On the other hand, it has high electronic charge carrier mobility. Herein, we measured μC* in amorphous and crystalline polymer films to find out which polymer shows better performance in OECTs.