Method to control flatband/threshold voltage in high-k metal gated stacks and structures thereof
    2.
    发明申请
    Method to control flatband/threshold voltage in high-k metal gated stacks and structures thereof 审中-公开
    控制高k金属栅组合中的平带/阈值电压的方法及其结构

    公开(公告)号:US20060289948A1

    公开(公告)日:2006-12-28

    申请号:US11158372

    申请日:2005-06-22

    IPC分类号: H01L29/94

    摘要: The present invention provides a metal stack (or gate stack) structure that stabilizes the flatband voltage and threshold voltages of material stacks that include a gate conductor and a dielectric material having a dielectric constant of greater than about 4.0, especially a Hf-based dielectric. This present invention stabilizes the flatband voltages and the threshold voltages by introducing an alkaline earth metal-containing layer into the material stack that introduces, via electronegativity differences, a shift in the threshold voltage to the desired voltage. Specifically, the present invention provides a metal stack comprising a high k dielectric, preferably a hafnium-based dielectric; an alkaline earth metal-containing layer located atop of, or within, said high k dielectric; an electrically conductive capping layer located above said high k dielectric; and a gate conductor.

    摘要翻译: 本发明提供一种金属堆叠(或栅极堆叠)结构,其稳定包括栅极导体和介电常数大于约4.0的介电材料的材料堆叠的平带电压和阈值电压,特别是基于Hf的电介质。 本发明通过将含碱土金属的层引入材料堆中来稳定平带电压和阈值电压,其通过电负性差异将阈值电压的偏移引入所需电压。 具体地,本发明提供一种包括高k电介质,优选铪基电介质的金属叠层; 位于所述高k电介质的顶部或内部的含碱土金属的层; 位于所述高k电介质上方的导电覆盖层; 和栅极导体。