Patent ID: 8067300
Filing Date: 2011-11-29
Classification: C30B,H01L

Abstract:
1. A method of growing an Al x In y Ga 1-x-y N (0≦x≦1, 0≦y≦1, 0<x+y≦1) mixture crystal substrate comprising the steps of: implanting seeds on an undersubstrate; growing an Al forming pits composed of facets on the growing Al making closed defect accumulating regions (H) following bottoms of the facet pits and consisting of cores (S) having converged dislocations and extending perpendicular to the undersubstrate and grain boundaries (K) enclosing the cores (S); making accompanying low dislocation single crystal regions (Z) surrounding the closed defect accumulating regions (H) under the pit facets; making extra low dislocation single crystal regions (Y) around the accompanying low dislocation single crystal regions (Z) under a C-plane growing surface outside of the facet pits; utilizing solely the grain boundaries (K) or both the grain boundaries (K) and the cores (S) enclosed by the grain boundaries (K) as dislocation annihilation/accumulation regions; gathering dislocations by the facet pits from the accompanying low dislocation single crystal regions (Z) and the extra low dislocation single crystal regions (Y) to the closed defect accumulating regions (H); annihilating and accumulating the dislocations in the boundaries (K) or in the boundaries (K) and the cores (S) of the closed defect accumulating regions (H); reducing dislocations in the accompanying low dislocation single crystal regions (Z) and the extra low dislocation single crystal regions (Y); and obtaining a low dislocation Al