Patent ID: 10910489

Abstract:
A semiconductor device according to an embodiment includes: a substrate; a first nitride semiconductor layer that is provided above the substrate, has a first lattice period in a first direction parallel to a substrate plane, and includes nitrogen and aluminum; a second nitride semiconductor layer that is provided between the substrate and the first nitride semiconductor layer and includes nitrogen and aluminum and of which at least a portion has a second lattice period that is three times the first lattice period in the first direction parallel to the substrate plane; a third nitride semiconductor layer provided above the first nitride semiconductor layer; a fourth nitride semiconductor layer that is provided on the third nitride semiconductor layer and has a larger bandgap than the third nitride semiconductor layer; at least one main electrode provided on the fourth nitride semiconductor layer; and a control electrode provided above the third nitride semiconductor layer, the control electrode being configured to control a current of the semiconductor device.