supported by the National Natural Science Foundation of China(Grant Nos.51577169 and 51777187);the National Key Research and Development Program of China(Grant No.2017YFB0402804)
The physical mechanisms of Ti/Al/Ni/Au ohmic contacts to AlGaN/GaN heterostructures by laser annealing and rapid thermal annealing are systematically investigated. The microstructures indicate that a better surface mo...