Patent ID: 8368183
Filing Date: 2013-02-05
Classification: H01L,H01S

Abstract:
1. A nitride semiconductor device comprising: a processed substrate formed by forming, on a surface of a nitride semiconductor substrate of which at least a surface is formed of a nitride semiconductor, a trench as at least one concave area in an etching process and a ridge portion as a non-trench, the trench having a first width and the ridge portion having a second width, the second width being greater than the first width, and a nitride semiconductor growth layer composed of a plurality of nitride semiconductor thin films grown in the trench and on the ridge portion of the processed substrate, the nitride semiconductor growth layer being laid with a principal plane direction aligned with a {0001} plane, wherein an off-angle, which is an angle between a first vector extending from a surface portion of the ridge in a direction normal thereto and a second vector extending parallel to a crystal direction <0001> when the first and second vectors are assumed to start at a same point, is 0.05° or more but 4° or less, wherein the nitride semiconductor device in finished form includes the processed substrate with the trench and the ridge portion on its uppermost surface, and wherein the second width of the ridge portion is 100 μm or more but 2,000 μm or less.