Invention Grant
- Patent Title: Semiconductor structure comprising an active semiconductor layer of the III-V type on a buffer layer stack and method for producing semiconductor structure
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Application No.: US15501923Application Date: 2015-07-22
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Publication No.: US09991346B2Publication Date: 2018-06-05
- Inventor: Joff Derluyn , Stefan Degroote
- Applicant: EPIGAN NV
- Applicant Address: BE Hasselt
- Assignee: EPIGAN NV
- Current Assignee: EPIGAN NV
- Current Assignee Address: BE Hasselt
- Agency: Workman Nydegger
- Priority: EP14179690 20140804
- International Application: PCT/EP2015/066785 WO 20150722
- International Announcement: WO2016/020196 WO 20160211
- Main IPC: H01L29/205
- IPC: H01L29/205 ; H01L29/66 ; H01L21/02 ; H01L29/778 ; H01L29/20 ; H01L29/06

Abstract:
A semiconductor structure includes a buffer layer stack comprising a plurality of III-V material layers, and the buffer layer stack includes at least one layered substructure. Each layered substructure comprises a compressive stress inducing structure between a respective first buffer layer and a respective second buffer layer positioned higher in the buffer layer stack than the respective first buffer layer. A lower surface of the respective second buffer layer has a lower Al content than an upper surface of the respective first buffer layer. An active semiconductor layer of the III-V type is provided on the buffer layer stack. The surface of the respective relaxation layers is sufficiently rough to inhibit the relaxation of the respective second buffer layer, and comprises a Root Mean Square (RMS) roughness larger than 1 nm. A method is provided for producing the semiconductor structure.
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