THREE-DIMENSIONAL SEMICONDUCTOR MEMORY DEVICES

    公开(公告)号:US20180151590A1

    公开(公告)日:2018-05-31

    申请号:US15871375

    申请日:2018-01-15

    CPC classification number: H01L27/11582 H01L27/11565 H01L27/1157 H01L29/7926

    Abstract: Three-dimensional (3D) nonvolatile memory devices include a substrate having a well region of second conductivity type (e.g., P-type) therein and a common source region of first conductivity type (e.g., N-type) on the well region. A recess extends partially (or completely) through the common source region. A vertical stack of nonvolatile memory cells on the substrate includes a vertical stack of spaced-apart gate electrodes and a vertical active region, which extends on sidewalls of the vertical stack of spaced-apart gate electrodes and on a sidewall of the recess. Gate dielectric layers extend between respective ones of the vertical stack of spaced-apart gate electrodes and the vertical active region. The gate dielectric layers may include a composite of a tunnel insulating layer, a charge storage layer, a relatively high bandgap barrier dielectric layer and a blocking insulating layer having a relatively high dielectric strength.

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