Invention Grant
- Patent Title: Air break for improved silicide formation with composite caps
- Patent Title (中): 用复合盖改善硅化物形成的空气断裂
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Application No.: US12062592Application Date: 2008-04-04
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Publication No.: US07659199B2Publication Date: 2010-02-09
- Inventor: Robert J. Purtell , Keith Kwong Hon Wong
- Applicant: Robert J. Purtell , Keith Kwong Hon Wong
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Gibb I.P. Law Firm, LLC
- Agent Joseph P. Abate, Esq.
- Main IPC: H01L21/44
- IPC: H01L21/44

Abstract:
Disclosed is a structure and method for tuning silicide stress and, particularly, for developing a tensile silicide region on a gate conductor of an n-FET in order to optimize n-FET performance. More particularly, a first metal layer-protective cap layer-second metal layer stack is formed on an n-FET structure. However, prior to the deposition of the second metal layer, the protective layer is exposed to air. This air break step alters the adhesion between the protective cap layer and the second metal layer and thereby, effects the stress imparted upon the first metal layer during silicide formation. The result is a more tensile silicide that is optimal for n-FET performance. Additionally, the method allows such a tensile silicide region to be formed using a relatively thin first metal layer-protective cap layer-second metal layer stack, and particularly, a relatively thin second metal layer, to minimize mechanical energy build up at the junctions between the gate conductor and the sidewall spacers to avoid silicon bridging.
Public/Granted literature
- US20080220604A1 AIR BREAK FOR IMPROVED SILICIDE FORMATION WITH COMPOSITE CAPS Public/Granted day:2008-09-11
Information query
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