Patent ID: 9379523
Filing Date: 2016-06-28
CPC Classification: H01L,H01S

Claim Text:
1. A Group III nitride semiconductor device comprising: a Group III nitride semiconductor layer having a primary surface including a Group III nitride semiconductor, the primary surface being inclined with respect to a c-plane of the Group III nitride semiconductor at an angle in a range of 50 degrees or more and 80 degrees or less; a p-type Group III nitride semiconductor laminate including a first p-type Group III nitride semiconductor layer, a second p-type Group III nitride semiconductor layer and a third p-type Group III nitride semiconductor layer, the first p-type Group III nitride semiconductor layer, the second p-type Group III nitride semiconductor layer and the third p-type Group III nitride semiconductor layer being provided on the primary surface of the Group III nitride semiconductor layer, the second p-type Group III nitride semiconductor layer being sandwiched between the first p-type Group III nitride semiconductor layer and the third p-type Group III nitride semiconductor layer such that the second p-type Group III nitride semiconductor layer incorporates strain; and an electrode provided on the p-type Group III nitride semiconductor laminate, the electrode being in contact with the first p-type Group III nitride semiconductor layer, the first p-type Group III nitride semiconductor layer, the second p-type Group III nitride semiconductor layer and the third p-type Group III nitride semiconductor layer being arranged in a direction from the electrode to the Group III nitride semiconductor layer along an axis normal to the primary surface, and wherein the second p-type Group III nitride semiconductor layer has a thickness of not less than 2 nm and a thickness of not more than 10 nm.