Metal-insulator-metal capacitor in copper
    1.
    发明授权
    Metal-insulator-metal capacitor in copper 有权
    铜中的金属 - 绝缘体 - 金属电容器

    公开(公告)号:US06750113B2

    公开(公告)日:2004-06-15

    申请号:US09764832

    申请日:2001-01-17

    IPC分类号: H01L2120

    摘要: A parallel plate capacitor in copper technology is formed in an area that has no copper below it (within 0.3 &mgr;m) with a bottom etch stop layer, a composite bottom plate having an aluminum layer below a TiN layer, an oxide capacitor dielectric, and a top plate of TiN; in a process that involves etching the top plate to leave a capacitor area, etching the bottom plate to a larger bottom area having a margin on all sides; depositing an interlayer dielectric having a higher material quality below the top surface of the capacitor top plate; opening contact apertures to the top and bottom plates and to lower interconnect to a two step process that partially opens a nitride cap layer on the lower interconnect and the top plate while penetrating the nitride cap layer above the bottom plate, then cutting through the capacitor dielectric and finishing the penetration of the nitride cap layer.

    摘要翻译: 在铜技术中的平行平板电容器形成在其下方没有铜(0.3μm以下)的区域中,底部蚀刻停止层,在TiN层下方具有铝层的复合底板,氧化物电容器电介质和 TiN顶板; 在包括蚀刻顶板以留下电容器区域的过程中,将底板蚀刻到具有在所有侧面上的边缘的较大底部区域; 在电容器顶板的顶表面下沉积具有较高材料质量的层间电介质; 打开接触孔到顶板和底板,并且将互连件下降到两步工艺,其在穿过底板上方的氮化物盖层之后部分地打开下互连和顶板上的氮化物盖层,然后切穿电容器电介质 并完成氮化物盖层的穿透。