Patent ID: 9601662
Date: 2017-03-21
CPC Classifications: H01L

Claim:
1. A semiconductor light emitting device, comprising: a foundation region having a first major surface and a second major surface on a side opposite to the first major surface, the foundation region including a nitride semiconductor; a first semiconductor layer of a first conductivity type including a nitride semiconductor, the first semiconductor layer being stacked with the foundation region along a stacking direction; a light emitting layer provided between the foundation region and the first semiconductor layer, the light emitting layer including a nitride semiconductor; and a second semiconductor layer of a second conductivity type provided between the foundation region and the light emitting layer, the second conductivity type being different from the first conductivity type, the second semiconductor layer including a nitride semiconductor, the first major surface facing the second semiconductor layer, the foundation region having an unevenness provided on the second major surface, the unevenness having a recess, a side portion, and a protrusion, the first major surface having an overlay-region which overlays the recess when viewed along the stacking direction, the foundation region having a plurality of dislocations, the dislocations including first dislocations whose one ends reach the recess and second dislocations whose one ends reach the protrusion, an another end of at least one of the second dislocations reaching the side portion without reaching the first major surface, a number of the second dislocations reaching the first major surface being smaller than a number of the first dislocations reaching the first major surface, an another end of at least one of the first dislocations reaching the overlay-region, and a number of the another end of the first dislocations reaching the overlay-region being smaller than a number of the one ends of the first dislocations reaching the recess.