Patent ID: 6940098
Filing Date: 2005-09-06
Classification: C30B,H01L

Abstract:
1. A semiconductor base comprising a substrate and a GaN crystal formed on said substrate by vapor phase growth, wherein (a) the substrate is a base on which is the grown GaN crystal, and which is made of sapphire, wherein the sapphire is C-plane, A-plane, or R-plane, SiC, wherein the SiC is 6H, 4H, or 3C, GaN, Si, Spinel, ZnO, GaAs, or NGO, (b) the substrate has a concavo-convex surface as a crystal growth plane, and (c) the GaN crystal having been grown laterally from an upper part of the convex part of the concavo-convex surface and a surface of the concave part as starting points, such that the crystal grown laterally from the upper part of the convex part and the crystal grown from the surface of the concave part are joined to cover the concavo-convex surface of the substrate.