Patent ID: 7528462
Filing Date: 2009-05-05
Classification: C30B,H01L

Abstract:
1. A multi-layered substrate comprising an aluminum nitride single-crystal layer which is laminated directly on an α-alumina single-crystal substrate through an edge-type dislocation layer made of Al, N and O, wherein the crystal lattice mismatch between the α-alumina single-crystal substrate and the aluminum nitride single-crystal layer is reduced by the dislocation layer, and wherein alon, which is aluminum oxynitride represented by Al (64+x)/3 □ (8−x)/3 O 32−x N x (wherein □ is a cation vacancy and 2<x<6), is not present in the multi-layered substrate after a reaction between the aluminum nitride single-crystal layer and the α-alumina single-crystal substrate.