Patent ID: 11955520
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A nitride semiconductor, comprising:
a nitride member,
the nitride member including:
a first nitride region including Alx1Ga1-x1N (0<x1≤1);
a second nitride region including Alx2Ga1-x1N (0<x2<1, x2<x1); and
a third nitride region, the second nitride region being between the first nitride region and the third nitride region, the third nitride region including Al, Ga, and N, the third nitride region not including carbon, alternatively a third carbon concentration in the third nitride region being lower than a second carbon concentration in the second nitride region,

wherein
the nitride member further includes
a fourth nitride region including Alx4Ga1-x4N (0≤x4<1), and
a fifth nitride region including Alx5Ga1-x5N (0≤x5<1, x4<x5),

the third nitride region is between the first nitride region and the fifth nitride region, and
the fourth nitride region is between the third nitride region and the fifth nitride region,
the fourth nitride region includes a first film region and a second film region,
the first film region is between the third nitride region and the second film region,
the first film region includes carbon, and
the second film region does not include carbon, alternately a carbon concentration in
the second film region is lower than a carbon concentration in the first film region.