Patent ID: 11942521
Assignee: INNOSCIENCE (SUZHOU) SEMICONDUCTOR CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A semiconductor device, comprising:
a substrate;
a stack of III-nitride transition layers disposed on the substrate, the stack of III-nitride transition layers maintaining an epitaxial relationship to the substrate;
a first III-nitride layer disposed on the stack of III-nitride transition layers, and
a second III-nitride layer disposed on the first III-nitride layer, the second III-nitride layer having a band gap energy greater than that of the first III-nitride layer,
wherein the stack of III-nitride transition layers comprises a first transition layer, a second transition layer on the first transition layer, a third transition layer on the second transition layer, and a fourth transition layer sandwiched between the third transition layer and the first III-nitride layer, and
wherein the second transition layer has a maximum in-plane lattice constant among the first transition layer, the second transition layer and the third transition layer; and the fourth transition layer has an in-plane lattice constant greater than that of the third transition layer.