Patent ID: 9349590
Filing Date: 2016-05-24
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a nitride semiconductor layer, comprising: forming a first lower layer of a nitride semiconductor on a major surface of a substrate and forming a first upper layer of a nitride semiconductor on the first lower layer to form a first stacked body including the first lower layer and the first upper layer, the first lower layer having a first lattice spacing along a first axis parallel to the major surface, the first upper layer having a second lattice spacing along the first axis larger than the first lattice spacing, at least a part of the first upper layer having a first compressive strain along the major surface, an absolute value of a ratio of a difference between the second lattice spacing and the first lattice spacing to the first lattice spacing being not less than 0.005 and not more than 0.019, and the forming the first upper layer including the second lattice spacing of the first upper layer after formation of the first stacked body has a value between an unstrained lattice constant of the first upper layer and an unstrained lattice constant of a first base layer located between the first lower layer and the substrate.