Experimental Study of Sputter Deposited Contacts to Gallium Nitride

Abstract

AbstractA variety of metal contacts to n-GaN is investigated, including Al, Au, Ce, Ti, Cr, Mg, Sb, W, and Mo, which were deposited using DC magnetron plasma sputtering onto MBE grown GaN. The contacts were characterized by current-voltage analysis and contact resistances were measured by the circular geometry transmission line method. The effects on contact resistance and Schottky barrier properties by surface sputtering treatments, GaN doping, and post-deposition annealing are reported.