Modeling of the turn-on characteristics of poly-silicon thin-film transistors with considering kink effect

Abstract

A semi-empirical analytical model of the turn-on characteristics of poly-silicon thin-film transistor (TFT) with considering kink effect is presented based on the physical characteristics of poly-silicon thin film. With reference to the approach of modeling the kink effect in SOI devices and considering the grain boundaries in poly-silicon thin film, the dc characteristics of poly-silicon TFT are simulated, including drain induced grain boundary lowering (DIGBL) effect, impact ionization, floating body effect, parasitic bipolar transistor (PBT) effect, etc. The simulation results show a good agreement with the experimental data.