Patent ID: 9412586
Filing Date: 2016-08-09
CPC Classification: C30B,H01L,Y10T

Claim Text:
1. 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 with a given plan-view pattern; epitaxially growing an initial-stage AlN layer at a growth temperature higher than a crystallization temperature of AlN 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; and epitaxially growing an Al a growth method for epitaxially growing the initial-stage AlN layer by performing C axis orientation control is different from the lateral overgrowth method for epitaxially growing the Al the initial-stage AlN layer is grown and deposited on the flat surfaces of the protrusion tops and on side walls and bottom surfaces of the recesses obtained by the recesses and protrusions forming process.