SELF-ALIGNED TOP CONTACT FOR MRAM FABRICATION
    24.
    发明申请
    SELF-ALIGNED TOP CONTACT FOR MRAM FABRICATION 有权
    自动对齐的MRAM制造的顶级联系人

    公开(公告)号:US20150249209A1

    公开(公告)日:2015-09-03

    申请号:US14195566

    申请日:2014-03-03

    Abstract: Systems and methods for forming precise and self-aligned top metal contact for a Magnetoresistive random-access memory (MRAM) device include forming a magnetic tunnel junction (MTJ) in a common interlayer metal dielectric (IMD) layer with a logic element. A low dielectric constant (K) etch stop layer is selectively retained over an exposed top surface of the MTJ. Etching is selectively performed through a top IMD layer formed over the low K etch stop layer and the common IMD layer, based on a first chemistry which prevents etching through the low K etch stop layer. By switching chemistry to a second chemistry which precisely etches through the low K etch stop layer, an opening is created for forming a self-aligned top contact to the exposed top surface of the MTJ.

    Abstract translation: 用于形成用于磁阻随机存取存储器(MRAM)器件的精确和自对准的顶部金属接触的系统和方法包括在具有逻辑元件的公共层间金属电介质(IMD)层中形成磁性隧道结(MTJ)。 低介电常数(K)蚀刻停止层选择性地保留在MTJ的暴露的顶表面上。 基于防止蚀刻通过低K蚀刻停止层的第一化学反应,通过形成在低K蚀刻停止层和公共IMD层上的顶部IMD层选择性地进行蚀刻。 通过将化学转换成精确地蚀刻通过低K蚀刻停止层的第二化学物质,形成一个开口以形成与MTJ暴露的顶表面的自对准顶部接触。

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