Patent ID: 6951695

Claim:
A wafer comprising Al x Ga y In z N, wherein 0≦x≦1, 0≦y≦1, 0≦z≦1 and x+y+z=1, characterized by a root mean square (RMS) surface roughness of less than 1 nm in a 10×10 μm 2 area on a wafer surface thereof, wherein the wafer surface is selected from the group consisting of: Al x Ga y In z -terminated surfaces of Al x Ga y In z N in an (0001) orientation, offcuts of Al x Ga y In z -terminated surfaces of Al x Ga y In z N in an (0001) orientation, offcuts of N-terminated surfaces of Al x Ga y In z N in an (0001) orientation, A-plane surfaces, M-plane surfaces, R-plane surfaces, offcuts of A-plane surfaces, offcuts of M-plane surfaces, and offcuts of R-plane surfaces.