Improved electrical characteristics of AlxGa1−xN/GaN High Electron Mobility Transistor by effect of physical and geometrical parameters

Abstract

This research aims to study the impact of some physical and structural parameters on the I–V characteristics of a high electron mobility transistors (HEMTs) based on AlxGa1-x N/GaN, we investigate the effect of the GaN buffer layer thickness and the impact of other properties of the materials such as aluminum mole fraction and doping concentration, the Al0.2Ga0.8 N/GaN heterostructures with 400 nm of buffer layer and a layer doped with  n = 4 x 1018 cm-3 , for this structure we find the maximum saturation current of 420 mA/mm . The proposed model included GaN buffer layer and Al content were derived from our developed I-V characteristics. The proposed model is in excellent agreement with the simulated I-V characteristics and experimental results.