Patent ID: 8659031

Claim:
A method for producing a template for epitaxial growth, comprising: processing a surface of a sapphire (0001) substrate to form recesses and protrusions on the surface so that protrusion tops are made flat and have a given plan-view pattern; epitaxially growing an initial-stage AlN layer on the surface of the sapphire (0001) substrate having the recesses and protrusions by performing C axis orientation control so that a C+ axis oriented AlN layer grows on flat surfaces of the protrusion tops, excluding edges, and that the AlN layer deposited on the recesses obtained by the recesses and protrusions forming process forms new recesses over the recesses; epitaxially growing a first ELO layer including an AlN (0001) layer, on the initial-stage AlN layer by an epitaxial lateral overgrowth method; stopping the first ELO layer from growing before a recess upper region above the new recesses is completely covered with the first ELO layer that is laterally grown from a protrusion upper surface of the initial-stage AlN layer, and then epitaxially growing a second ELO layer including an Al x Ga 1-x N (0001) layer (1>x>0) layer by an epitaxial lateral overgrowth method; and covering the recess upper region completely with the second ELO layer that is laterally grown from an upper surface of the first ELO layer.