Invention Grant
- Patent Title: Wrap around contact for nanosheet source drain epitaxy
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Application No.: US16720727Application Date: 2019-12-19
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Publication No.: US11302813B2Publication Date: 2022-04-12
- Inventor: Alexander Reznicek , Xin Miao , Choonghyun Lee , Jingyun Zhang
- Applicant: International Business Machines Corporation
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agent Edward J. Wixted, III
- Main IPC: H01L29/78
- IPC: H01L29/78 ; H01L29/06 ; H01L29/423 ; H01L29/66 ; H01L29/40 ; H01L21/306

Abstract:
Embodiments of the invention include a method for fabricating a semiconductor device and the resulting structure. A nanosheet stack of alternating nanosheets of a sacrificial semiconductor material and a semiconductor channel material located on a substrate is provided. An additional dielectric spacer is formed on the dielectric spacer and within a gap. Dielectric spacer is removed. An epitaxial oxide layer is formed on the re-exposed recessed surfaces of the substrate. Germanium is formed on the epitaxial oxide layer. Sidewalls of each semiconductor channel material nanosheet are physically exposed. A source/drain is formed on a surface of the germanium. ILD material is formed above each source/drain and above an adjacent region. Portions of ILD material are removed such that sidewalls of the source/drain and germanium are exposed. The germanium is removed. A contact region is formed that wraps around the source/drain region.
Public/Granted literature
- US20210193829A1 WRAP AROUND CONTACT FOR NANOSHEET SOURCE DRAIN EPITAXY Public/Granted day:2021-06-24
Information query
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