Patent ID: 8643040

Claim:
A light emitting device comprising: a light emitting structure including a second conduction type semiconductor layer, an active layer, and a first conduction type semiconductor layer; a second electrode layer arranged under the light emitting structure; at least one first recess provided to pass through the second electrode layer, the second conduction type semiconductor layer and the active layer and exposing the first conduction type semiconductor layer, wherein a plurality of second recesses are provided at a distal end of the at least one first recess; a first electrode layer provided in the at least one first recess and the plurality of second recesses at the distal end of the at least one first recess and directly contacting an exposed region of the first conduction type semiconductor layer through the first recess; and an insulating layer disposed adjacent a side surface of the at least one first recess, and arranged between the second electrode layer and the first electrode layer, between the second conduction type semiconductor layer and the first electrode layer, and between the active layer and the first electrode layer, wherein the insulating layer contacts exposed regions of the first conduction type semiconductor layer, wherein the first electrode layer has a roughness provided in the plurality of second recesses, and the roughness provided in the plurality of second recesses increases a contact area with the first conduction type semiconductor layer and is in ohmic contact with the first conduction type semiconductor layer.