Patent ID: 7589001

Claim:
A method for manufacturing a GaN group semiconductor crystal defined by Al x Ga 1-x-y In y N wherein 0≦x≦1 and 0≦y≦1, which method comprises: (a) preparing a substrate for crystal growth, wherein the substrate has a crystal growth plane having concave parts with bottom surfaces formed by etching the original substrate, which consequently contains concaves and convexes formed by the concave parts and the remaining convex parts, and wherein not more than 50% of the crystal growth plane is an area occupied by the convex parts, and the concave parts have a mask layer formed on the bottom; and (b) growing the GaN group semiconductor crystals on the crystal growth plane having concaves and convexes by vapor phase growth, and connecting the crystals grown from the upper part of the convex parts to each other to form a layer of the GaN group semiconductor crystal.