Surface oxidation control of metal gates using capping layer

    公开(公告)号:US12293916B2

    公开(公告)日:2025-05-06

    申请号:US18230712

    申请日:2023-08-07

    Abstract: A method includes forming a dummy gate stack on a semiconductor fin, forming gate spacers on sidewalls of the dummy gate stack, forming a first inter-layer dielectric, with the gate spacers and the dummy gate stack being in the first inter-layer dielectric, removing the dummy gate stack to form a trench between the gate spacers, forming a replacement gate stack in the trench, and depositing a dielectric capping layer. A bottom surface of the dielectric capping layer contacts a first top surface of the replacement gate stack and a second top surface of the first inter-layer dielectric. A second inter-layer dielectric is deposited over the dielectric capping layer. A source/drain contact plug is formed and extends into the second inter-layer dielectric, the dielectric capping layer, and the first inter-layer dielectric.

    METAL HARD MASKS FOR REDUCING LINE BENDING

    公开(公告)号:US20250079172A1

    公开(公告)日:2025-03-06

    申请号:US18953928

    申请日:2024-11-20

    Abstract: A method includes forming a metal-containing hard mask layer over a dielectric layer, wherein the metal-containing hard mask layer has a Young's modulus greater than about 400 MPa and a tensile stress greater than about 600 MPa, patterning the metal-containing hard mask layer to form an opening in the metal-containing hard mask layer, and etching the dielectric layer using the metal-containing hard mask layer as an etching mask. The opening extends into the dielectric layer. The opening is filled with a conductive material to form a conductive feature. The metal-containing hard mask layer is then removed.

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