Invention Grant
- Patent Title: Middle of the line (MOL) metal contacts
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Application No.: US15219378Application Date: 2016-07-26
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Publication No.: US09721889B1Publication Date: 2017-08-01
- Inventor: Chengyu C. Niu , Vimal K. Kamineni , Mark V. Raymond , Xunyuan Zhang
- Applicant: GLOBALFOUNDRIES INC.
- Applicant Address: KY Grand Cayman
- Assignee: GLOBALFOUNDRIES INC.
- Current Assignee: GLOBALFOUNDRIES INC.
- Current Assignee Address: KY Grand Cayman
- Agency: Gibb & Riley, LLC
- Agent Francois Pagette
- Main IPC: H01L23/48
- IPC: H01L23/48 ; H01L23/528 ; H01L23/532 ; H01L23/535 ; H01L21/768

Abstract:
Integrated circuit (IC) structure embodiments and methods of forming them with middle of the line (MOL) contacts that incorporate a protective cap, which provides protection from damage during back end of the line (BEOL) processing. Each MOL contact has a main body in a lower portion of a contact opening. The main body has a liner (e.g., a titanium nitride layer) that lines the lower portion and a metal layer on the liner. The MOL contact also has a protective cap in an upper portion of the contact opening above the first metal layer and extending laterally over the liner to the sidewalls of the contact opening. The protective cap has an optional liner, which is different from the liner in the lower portion, and a metal layer, which is either the same or different than the metal in the main body.
Information query
IPC分类: