Dimensions of transport channels for charge carriers and ions in polymer electrochemical transistors
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초록
내용
A two-dimensional charge sheet is assumed to be formed in typical field-effect transistors. However, when it comes to electrochemical transistors, ionic transport takes place during their operation, resulting in a formation of a pseudo-three-dimensional channel with a volumetric capacitance of the film. In this presentation, we discuss about the channel dimensions for transport of charge carriers and ions in polymer thin films in organic electrochemical transistors. Humidity is a key factor that determines the channel dimension of the water-processed polymer composites and in the water-based electrochemical devices. The charge carriers are confined at the interfacial region if the ionic components are not allowed to penetrate in the channel. We also discuss about device designs for enhancing the ion accessibility in the channel.