Patent ID: 7179667

Claim:
A semiconductor base comprising a substrate and a semiconductor crystal grown by vapor phase growth on the substrate, wherein said substrate is a crystal substrate comprising sapphire, SiC, Si, Spinel, ZnO, GaAs or NGO and has a crystal growth plane having a concavo-convex surface, wherein said semiconductor crystal is an Al x Ga l−x−y In y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1) crystal which grew from each of the concave part and the convex part and joined to cover said concavo-convex surface, wherein, during the growth step of said semiconductor crystal, facet structure growth occurs from both the concave part and the convex part, and wherein said semiconductor crystal has, in the inside, a dislocation line extending in the C axis direction from the substrate and then bending in the lateral direction as a result of the facet structure growth.