The room-temperature velocity-field characteristics for n -type gallium nitride and AlGaNGaN heterostructures, grown epitaxially on sapphire, were determined experimentally. A pulsed voltage input and four-point measurements were used on special geometry samples to determine the electron drift velocity as a function of applied electric field in the basal plane. These measurements show apparent saturation velocities near 2.5× 107 cms at 180 kVcm for the n -type gallium nitride and 3.1× 107 cms at 140 kVcm for the AlGaNGaN heterostructures. A comparison of these studies shows that the experimental velocities are close to previously published simulations based upon Monte Carlo techniques.
ASJC Scopus subject areas
- Physics and Astronomy(all)