Temperature dependence of forward current characteristics of GaN junction and Schottky rectifiers

A comparison was made of the forward current-voltage characteristics of bulk GaN Schottky and p-n junction rectifiers using a quasi-three-dimensional simulator. The model includes incomplete ionization of the deep Mg acceptor (175 meV) in the p(+)-GaN side of the junction and the temperature dependence of mobility and GaN band gap. The forward turn-on voltages, V-F, decrease with increasing temperature for both types of rectifier and are similar to2.5 V at 100 A cm(-2) at 573 K for the junction diodes and less than or equal to 1 V under similar conditions for the Schottky diodes. The effect of p-layer thickness and doping in the p-n junction was also investigated. (C) 2003 Published by Elsevier Science Ltd.