Patent ID: 8390101

Claim:
A microelectronic device structure adapted for high voltage operation, said microelectronic device structure comprising: (a) a first conductive GaN base layer comprising a GaN structure having a thickness of greater than about 50 μm and having a top surface characterized by a dislocation defect density of not more than about 5×10 6 /cm 2 ; (b) a second GaN layer having a dopant concentration of not more than about 1×10 16 /cm 3 , disposed adjacent to the top surface of said first conductive GaN base layer; and (c) at least one metal contact adjacent to at least one of (i) the top surface of said first conductive GaN base layer and (ii) said second GaN layer, forming a metal-to-semiconductor junction with at least one of said first conductive GaN base layer and said second GaN layer; wherein said microelectronic device structure has a breakdown voltage of at least about 450V.