Patent ID: 7691651

Claim:
A method for manufacturing a nitride-based semiconductor device, comprising steps of: growing an AlN nucleation layer on a substrate by hydride vapor phase epitaxy (HVPE); growing a GaN buffer layer on the AlN nucleation layer by HVPE; and annealing the GaN buffer layer for a period of an annealing time, wherein the AlN nucleation layer is formed to have a thickness greater than a critical radius of a nucleus of AlN crystal and less than a critical resilient thickness of AlN, the GaN buffer layer is formed to have a thickness greater than a critical radius of a nucleus of GaN crystal and less than a critical resilient thickness of GaN, and the annealing time is greater than L 2 /D Ga where L indicates a diffusion distance of Ga, and D Ga indicates a diffusion coefficient of Ga in the AlN nucleation layer.