ISOLATION MODULE FOR BACKSIDE POWER DELIVERY

    公开(公告)号:US20250040170A1

    公开(公告)日:2025-01-30

    申请号:US18738717

    申请日:2024-06-10

    Abstract: A method of forming a portion of a gate-all-around field-effect transistor (GAA FET) includes forming placeholders, each interfacing with an extension region via a cap layer, in recesses formed in portions of a substrate isolated by shallow trench isolations (STIs), the recesses extending into an inter-layer dielectric (ILD) formed on the substrate, removing the placeholders selectively to the substrate, the cap layers, and the STIs, forming selective cap layers at bottoms of the recesses, performing a substrate removal process to isotropically etch the substrate within the recesses, performing a conformal deposition process to form a spacer on exposed surfaces of the substrate and the selective cap layers within the recesses, sculpting the spacer on sidewalls of the substrate and the STIs within the recesses, performing a cap layer removal process to remove the cap layers within the recesses, and forming metal contacts within the recesses.

    VOID-FREE CONTACT TRENCH FILL IN GATE-ALL-AROUND FET ARCHTECTURE

    公开(公告)号:US20220384258A1

    公开(公告)日:2022-12-01

    申请号:US17728871

    申请日:2022-04-25

    Abstract: A method of forming a contact trench structure in a semiconductor device, the method includes performing a first selective deposition process to form a contact on sidewalls of a trench, each of the sidewalls of the trench comprising a first cross section of a first material and a second cross section of a second material, performing a second selective deposition process to form a metal silicide layer on the contact, performing a first metal fill process to form a contact plug within the trench, the first metal fill process including depositing a contact plug metal material within the trench, performing an etch process to form an opening within the trench, comprising partially etching the contact plug metal material within the trench, and performing a second metal fill process, the second metal fill process comprising depositing the contact plug metal material within the opening.

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