Abstract
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► A mathematical model is presented based on the variable range hopping (VRH) transport theory. ► Using the VRH model the expression of source drain current is established under dark and under UV illumination (365nm). ► A good agreement between theoretical model and experimental measurement is obtained under dark and under UV illumination. ► we give a simple small-signal equivalent circuit to the thin film transistor.
The electronic charge transport of thin film transistors (TFTs) based on pentacene and zinc oxide semiconductors was studied. A mathematical model is presented based on the variable range hopping (VRH) transport theory. Using the VRH model, the expression of source drain current is established under dark and under UV illumination (365nm) in linear regime for drain bias VD=−2V and 2V, when we used pentacene and zinc oxide, respectively, at 300K. All electrical key parameters of TFTs based on pentacene and zinc oxide were extracted. A good agreement between theoretical model and experimental measurement, transfer characteristics was obtained under dark and UV illumination conditions. Finally, we give a simple small-signal equivalent circuit to the organic and inorganic thin film transistor.