Patent ID: 6316785
Filing Date: 2001-11-13
Classification: B82Y,H01L,H01S

Abstract:
A nitride-compound semiconductor device comprising:a substrate having a top surface;a first layer disposed on said top surface of said substrate, said first layer formed from the materials represented as Al.sub.x Ga.sub.y In.sub.z B.sub.1-(x+y+z) N where 0.ltoreq.x,y,z and x+y+z.ltoreq.1;a second layer disposed on said first layer, said second layer formed from the materials represented as Al.sub.u Ga.sub.v In.sub.w B.sub.1-(u+v+w) N where 0.ltoreq.u,v,w and u+v+w.ltoreq.1; anda semiconductor element disposed on said second layer;wherein said first layer and said second layer form an interface having a plurality of protrusions, and where a side wall, a top surface, and a bottom surface of each protrusion is a single crystal.