Morphological and electrical comparison of Ti and Ta based ohmic contacts for AlGaN/GaN-on-SiC HFETs. - Alexander Pooth; Johan Bergsten; Niklas Rorsman; Hassan Hirshy; R. Perks; Paul J. Tasker; Trevor Martin; Richard F. Webster; Dave Cherns; Michael J. Uren; Martin Kuball (Microelectron. Reliab., 2017)