Patent ID: 9412857
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A nitride semiconductor device comprising: a first semiconductor layer including a nitride semiconductor; a second semiconductor layer provided on the first semiconductor layer, the second semiconductor layer including a nitride semiconductor having a band gap wider than a band gap of the first semiconductor layer, the second semiconductor layer including a concave portion; a first electrode provided in the concave portion; a second electrode provided on the second semiconductor layer, the second electrode being electrically connected to the second semiconductor layer; a third electrode provided on the second semiconductor layer, the first electrode being disposed between the third electrode and the second electrode, the third electrode being electrically connected to the second semiconductor layer; a first insulating film provided between the first electrode and an inner wall of the concave portion, the first insulating film being in contact with the second semiconductor layer between the first electrode and an inner wall of the concave portion, the first insulating film being provided between the first electrode and the second electrode, the first insulating film being in contact with the second semiconductor layer between the first electrode and the second electrode, the first insulating film being spaced from the third electrode, an end of the first insulating film on a side of the third electrode being covered by the first electrode, the first insulating film being in direct contact with the second electrode, the first insulating film including oxygen; and a second insulating film provided in contact with the second semiconductor layer between the first electrode and the third electrode, the second insulating film including nitrogen, a material of the second insulating film being different from a material of the first insulating film.