Patent ID: 9209021
Filing Date: 2015-12-08
Classification: H01L

Abstract:
1. A method for producing a Group III nitride semiconductor comprising: forming a concave-convex structure including posts and trenches on a main surface of a substrate; and growing Group III nitride semiconductor in a c-axis direction of the Group III nitride semiconductor on top surfaces of the posts and bottom surfaces of the trenches; wherein in the forming of the concave-convex structure, a first stripe structure and a second stripe structure, the first stripe structure including a plurality of first grooves which are arranged in a stripe pattern as viewed from above and are aligned parallel to a first direction, the second stripe structure including a plurality of second grooves which are arranged in a stripe pattern as viewed from above and are aligned parallel to a second direction crossing the first direction, are formed on the main surface of the substrate so that a difference in level is provided by a depth of the second grooves in the first grooves and a difference in level is provided by a depth of the first grooves in the second grooves, wherein a first processed side surface, which is a side surface of the post or the trench of the first stripe structure, is formed to have a crystal orientation satisfying following conditions: wherein a second processed side surface, which is a side surface of the post or the trench of the second stripe structure, is formed to have a crystal orientation satisfying following conditions: