Invention Grant
- Patent Title: Self-aligned contact structure for replacement metal gate
- Patent Title (中): 用于更换金属门的自对准接触结构
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Application No.: US13664869Application Date: 2012-10-31
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Publication No.: US08928090B2Publication Date: 2015-01-06
- Inventor: Soon-Cheon Seo , Balasubramanian S. Haran , Alexander Reznicek
- 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
- Agency: Scully, Scott, Murphy & Presser, P.C.
- Agent H. Daniel Schnurmann
- Main IPC: H01L29/76
- IPC: H01L29/76 ; H01L31/062

Abstract:
A metallic top surface of a replacement gate structure is oxidized to convert a top portion of the replacement gate structure into a dielectric oxide. After removal of a planarization dielectric layer, selective epitaxy is performed to form a raised source region and a raised drain region that extends higher than the topmost surface of the replacement gate structure. A gate level dielectric layer including a first dielectric material is deposited and subsequently planarized employing the raised source and drain regions as stopping structures. A contact level dielectric layer including a second dielectric material is formed over the gate level dielectric layer, and contact via holes are formed employing an etch chemistry that etches the second dielectric material selective to the first dielectric material. Raised source and drain regions are recessed. Self-aligned contact structures can be formed by filling the contact via holes with a conductive material.
Public/Granted literature
- US20140117421A1 SELF-ALIGNED CONTACT STRUCTURE FOR REPLACEMENT METAL GATE Public/Granted day:2014-05-01
Information query
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