Charge sheet model of a polysilicon thin-film transistor
A simple analytical model for the currentvoltage characteristics of a poly-Si thin-film transistor (TFT) using charge sheet analysis has been developed. An effective doping due to the presence of trap levels at grain boundaries and the effect of diffusion current is considered. The model also takes into account the charge sharing factor, necessary to explain the characteristics of a short channel device. The results so obtained for both long- and short-channel lengths were compared with the experimental data and good agreement was found. The transconductance and the drain conductance were also evaluated.
thin-film transistor poly-si grain size charge sheet approach