CHARGE BEHAVIOR IN ORGANIC THIN FILM TRANSISTORS
Abstract
In this work, we review the physical properties of organic materials and transistors, discussing especially the charge transport mechanisms. Finally, we present an analytical and continuous charge model for Organic Thin Film Transistors (OTFTs) from which analytical expressions of all the total capacitances are obtained. They are developed and finally written as continuous explicit functions of the applied voltage, resulting in a complete charge-based small-signal model composed by a unified charge control model derived from Poisson equation assuming an exponential density of localized states. This charge model was developed from a previously proposed analytical DC current model assuming a hopping based transport. Therefore our complete small signal model has the potential to be successfully used in circuit simulators for the design of OTFTs.
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