Patent ID: 8344403
Filing Date: 2013-01-01
Classification: H01L,Y10T

Abstract:
1. A C plane (0001) sapphire substrate comprising a plurality of protrusions formed on a primary surface of the sapphire substrate in a two-dimensionally repeated pattern so that in plan view of the sapphire substrate the protrusions have a shape of a polygon having sides that are not parallel to M-axis of the sapphire substrate, wherein the repeated pattern of the protrusions is such that six polygons forming a hexagon surround another protrusion, and in plan view of the sapphire substrate the hexagon has sides that are parallel to A-axis of the sapphire substrate, and in a sectional view of the sapphire substrate side surfaces of the protrusions incline, and an inclination angle of the side surfaces from the primary surface of the sapphire substrate is more than 105 degrees and not more than 150 degrees.