Self aligned litho etch process patterning method

    公开(公告)号:US12014926B2

    公开(公告)日:2024-06-18

    申请号:US18123820

    申请日:2023-03-20

    IPC分类号: H01L21/033 H10B10/00

    摘要: A method of defining a pattern includes forming a plurality of cut shapes and a first plurality of openings within a first layer of a multi-layer hard mask to expose first portions of the second layer. A plurality of etch stops is formed by implanting an etch rate modifying species in a portion of the plurality of cut shapes. The first layer is directionally etched at the plurality of cut shapes such that the plurality of etch stops remain. A spacer layer is formed on the first layer and the first portions. A second plurality of openings is formed within the spacer layer to expose second portions of the second layer. The spacer layer is directionally etched to remove the spacer layer from sidewalls of the plurality of etch stops. Portions of the second layer exposed through the first plurality of openings and the second plurality of openings are etched.