Patent ID: 8519412

Claim:
A semiconductor light-emitting device comprising: a substrate having an upper flat surface; one or more first protrusions on and elevated from the upper flat surface of the substrate, each first protrusion having a single recess through which a planar surface of the substrate is exposed planarly, the planar surface of the substrate being a planar bottom surface of the recess; a first semiconductor layer on the substrate including the one or more first protrusions; an active layer on the first semiconductor layer; a second semiconductor layer on the active layer; a first electrode on a predetermined portion of the first semiconductor layer, wherein the active layer and second semiconductor layer are not formed on the predetermined portion of the first semiconductor layer; and a second electrode on the second semiconductor layer, wherein the recess is formed inside the first protrusion, the planar bottom surface has a directional property of the c(0001) to enable a semiconductor material to grow planarly on the planar bottom surface, wherein the one or more first protrusions comprise a ring-shaped protrusion, the recess is inner space of the ring-shaped protrusion, and the semiconductor material is filled in the single recess included in the each first protrusion.