Invention Grant
- Patent Title: Sacrificial fin for contact self-alignment
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Application No.: US17728437Application Date: 2022-04-25
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Publication No.: US11646358B2Publication Date: 2023-05-09
- Inventor: Yann Mignot , Indira Seshadri , Su Chen Fan , Christopher J. Waskiewicz , Eric Miller
- 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: Tutunjian & Bitetto, P.C.
- Agent Joseph P. Curcuru
- Main IPC: H01L29/66
- IPC: H01L29/66 ; H01L21/28 ; H01L29/49 ; H01L29/78 ; H01L29/417

Abstract:
A method is presented for forming a self-aligned middle-of-the-line (MOL) contact. The method includes forming a fin structure over a substrate, depositing and etching a first set of dielectric layers over the fin structure, etching the fin structure to form a sacrificial fin and a plurality of active fins, depositing a work function metal layer over the plurality of active fins, depositing an inter-layer dielectric (ILD) and a second set of dielectric layers. The method further includes etching the second set of dielectric layers and the ILD to form a first, via portion and to expose a top surface of the sacrificial fin, removing the sacrificial fin to form a second via portion, and filling the first and second via portions with a conductive material to form the MOL contact in the first via portion and a contact landing in the second via portion.
Public/Granted literature
- US20220262923A1 SACRIFICIAL FIN FOR CONTACT SELF-ALIGNMENT Public/Granted day:2022-08-18
Information query
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