Two-dimensional subthreshold analysis of sub-micron GaN MESFET

An analytical two-dimensional (2D) model to accurately predict the channel potential and electric field distribution in sub-micron GaN MESFET operating in the sub-threshold regime based on (2D) analytical solution of Poisson's equation using superposition principle is presented. The results so obtained for channel potential, electric field, threshold voltage, etc are compared with simulated data using ATLAS 2D device simulator. The model is then extended to predict the current voltage characteristics and the effects of drain induced barrier lowering (DIBL) on the performance. Furthermore, the sub-threshold output characteristics of the device are also interpreted qualitatively.