SOURCE/DRAIN EPITAXIAL LAYER PROFILE
    10.
    发明公开

    公开(公告)号:US20240194784A1

    公开(公告)日:2024-06-13

    申请号:US18584282

    申请日:2024-02-22

    摘要: The present disclosure describes a method that mitigates the formation of facets in source/drain silicon germanium (SiGe) epitaxial layers. The method includes forming an isolation region around a semiconductor layer and a gate structure partially over the semiconductor layer and the isolation region. Disposing first photoresist structures over the gate structure, a portion of the isolation region, and a portion of the semiconductor layer and doping, with germanium (Ge), exposed portions of the semiconductor layer and exposed portions of the isolation region to form Ge-doped regions that extend from the semiconductor layer to the isolation region. The method further includes disposing second photoresist structures over the isolation region and etching exposed Ge-doped regions in the semiconductor layer to form openings, where the openings include at least one common sidewall with the Ge-doped regions in the isolation region. Finally the method includes growing a SiGe epitaxial stack in the openings.