InAlN/GaN HEMT using microwave annealing for low temperature ohmic contact formation

In this letter, a microwave annealing (MWA) method for Ohmic contact applied to InAlN/GaN high electron mobility transistor (HEMT) is the first time. The feature of MWA method is low operating temperature (450°C∼550°C). By using this technique, MWA-HEMT can achieve a low Ohmic contact resistance and smoother Ohmic contact surface than traditional rapid thermal annealing (RTA). The situation of Indium diffusion and device gate leakage current has been improved by this technique. Moreover, the reliability and RF performance of MWA-HEMT has a better result than RTA-HEMT.