Patent ID: 11973078
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. The structure of claim 5, wherein:
the different gate materials are metal materials with different work functions;
the different materials of corresponding polarization modulation portions are gallium nitride (GaN) doped by different p-type doping material selected from column I and column II elements;
the different material compositions of corresponding active portions are aluminum gallium nitride (AlGaN) with different Al proportions; and
the different structures of corresponding active portions comprise: (a) a graded structure that includes a plurality of sub-layers each of which comprises AlGaN with a different Al proportion and (b) a homogeneous structure that comprises AlGaN with a single constant Al proportion.