Invention Grant
- Patent Title: Selective ILD deposition for fully aligned via with airgap
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Application No.: US17215314Application Date: 2021-03-29
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Publication No.: US11676854B2Publication Date: 2023-06-13
- Inventor: Christopher J. Penny , Benjamin D. Briggs , Huai Huang , Lawrence A. Clevenger , Michael Rizzolo , Hosadurga Shobha
- Applicant: Tessera LLC
- Applicant Address: US CA San Jose
- Assignee: Tessera LLC
- Current Assignee: Tessera LLC
- Current Assignee Address: US CA San Jose
- Agency: Haley Guiliano LLP
- The original application number of the division: US15837361 2017.12.11
- Main IPC: H01L21/768
- IPC: H01L21/768 ; H01L23/528

Abstract:
A method is presented forming a fully-aligned via (FAV) and airgaps within a semiconductor device. The method includes forming a plurality of copper (Cu) trenches within an insulating layer, forming a plurality of ILD regions over exposed portions of the insulating layer, selectively removing a first section of the ILD regions in an airgap region, and maintaining a second section of the ILD regions in a non-airgap region. The method further includes forming airgaps in the airgap region and forming a via in the non-airgap region contacting a Cu trench of the plurality of Cu trenches.
Public/Granted literature
- US20210217653A1 SELECTIVE ILD DEPOSITION FOR FULLY ALIGNED VIA WITH AIRGAP Public/Granted day:2021-07-15
Information query
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