Patent ID: 9324791
Filing Date: 2016-04-26
CPC Classification: B23K,B28D,H01L

Claim Text:
1. A semiconductor element comprising: a substrate having a first main face and a second main face, the substrate being a sapphire substrate; and a semiconductor layer formed on a, side of one of the first main face and the second main face of the substrate, wherein the substrate has a plurality of isolated processed portions and an irregularity face that runs from the processed portions at least to the first main face of the substrate and links adjacent ones of the processed portions, the irregularity face runs from each of the processed portions to the first main face without passing through another of the processed portions and links the adjacent ones of the processed portions so that the irregularity face extends over a region between the processed portions and the first main face, the substrate has only one row of the processed portions along a depth direction of the substrate, all of the processed portions are disposed closer to the first main face than the second main face in the substrate, and a flat surface or a series of stepped flat surfaces extends over a region between the processed portions and the second main face of the substrate.