Modelling temperature dependence on AlGaN/GaN power HEMT device characteristics

Abstract

This paper reports extensive modelling and analysis of the temperature dependence on the device characteristics of the AlGaN/GaN high electron mobility transistors (HEMTs). A physics-based model is proposed in this study in order to correctly predict the gate flat-band Schottky barrier height, energy band Fermi-level (EC-EF) at the AlGaN/GaN interface, two-dimensional electron gas sheet density, gate threshold and (I D-VG) at sub-threshold voltages, and drain current-voltage (ID-VD) characteristics under various high-temperature conditions. The analytical results are then verified by comparing with the laboratory measurement as well as the numerical results obtained from the Sentaurus TCAD simulation. The proposed model is found to be useful for power electronic device designers on the prediction of the AlGaN/GaN HEMT device performance under high-temperature operation. © 2013 IOP Publishing Ltd.