Invention Grant
- Patent Title: Metallic interconnect structures with wrap around capping layers
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Application No.: US15845734Application Date: 2017-12-18
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Publication No.: US10672653B2Publication Date: 2020-06-02
- Inventor: Cornelius Brown Peethala , Kedari Matam , Chih-Chao Yang , Theo Standaert
- 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: Ryan, Mason & Lewis, LLP
- Agent Vazken Alexanian
- Main IPC: H01L21/768
- IPC: H01L21/768 ; H01L23/522 ; H01L23/532

Abstract:
Techniques are provided to fabricate metal interconnects using liner planarization-free process flows. A sacrificial layer is formed on a dielectric layer, and the sacrificial and dielectric layers are patterned to form an opening in the dielectric layer. A conformal liner layer is deposited, and a metal layer deposited to form a metal interconnect in the opening. An overburden portion of the metal layer is planarized to expose an overburden portion of the liner layer. A first wet etch is performed to selectively remove the overburden portion of the liner layer. A second wet etch process is performed to selectively remove the sacrificial layer, resulting in extended portions of the liner layer and the metal interconnect extending above a surface of the dielectric layer. A dielectric capping layer is formed to cover the sidewall and upper surfaces of the extended portions of the liner layer and the metal interconnect.
Public/Granted literature
- US20190189508A1 METALLIC INTERCONNECT STRUCTURES WITH WRAP AROUND CAPPING LAYERS Public/Granted day:2019-06-20
Information query
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