Patent ID: 11967641
Assignee: TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor device, comprising:
a first electrode;
a second electrode;
a first nitride region including Alx1Ga1−x1N (0≤x1<1) and including a first partial region, a second partial region, a third partial region between the first partial region and the second partial region, a fourth partial region between the first partial region and the third partial region, and a fifth partial region between the third partial region and the second partial region, a first direction from the first partial region toward the first electrode crossing a second direction from the first electrode toward the second electrode, a direction from the second partial region toward the second electrode being aligned with the first direction;
a second nitride region including Alx2Ga1−x2N (0<x2≤1 and x1<x2) and including a sixth partial region and a seventh partial region, a direction from the fourth partial region toward the sixth partial region being aligned with the first direction, a direction from the fifth partial region toward the seventh partial region being aligned with the first direction;
a third electrode, a direction from the third partial region toward the third electrode being aligned with the first direction, at least a portion of the third electrode being between the sixth partial region and the seventh partial region in the second direction;
a first insulating film including a first insulating region and a second insulating region;
a third nitride region including Alx3Ga1−x3N (0<x3≤1 and x1<x3) and including first to seventh portions, the first portion being between the third electrode and the third partial region, the second portion being between the third electrode and the fourth partial region, the third portion being between the third electrode and the fifth partial region, the fourth portion being between the third electrode and the sixth partial region, the fifth portion being between the third electrode and the seventh partial region, the first insulating region being between the sixth portion and the sixth partial region, the second insulating region being between the seventh portion and the seventh partial region; and
a second insulating film including third to seventh insulating regions, the third insulating region being between the first portion and the third electrode, the fourth insulating region being between the fourth portion and the third electrode, the fifth insulating region being between the fifth portion and the third electrode, the sixth portion being between the sixth insulating region and the first insulating region, the seventh portion being between the seventh insulating region and the second insulating region,
wherein a crystallinity of the first portion is higher than a crystallinity of the sixth portion.