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    • 4. 发明申请
    • Method of forming metal lower electrode of a capacitor and method of selectively etching a metal layer for the same
    • 形成电容器的金属下电极的方法及其选择性蚀刻金属层的方法
    • US20050272218A1
    • 2005-12-08
    • US11145308
    • 2005-06-03
    • Young-Rae ParkYoung-Ho KohChang-Ki Hong
    • Young-Rae ParkYoung-Ho KohChang-Ki Hong
    • H01L21/3205H01L21/02H01L21/20H01L21/8242H01L23/52H01L27/108
    • H01L27/10894H01L27/10852H01L28/91
    • A method of forming a cylindrical lower electrode of a capacitor in which metal is used as a lower electrode of a capacitor. A metal capping layer is used in order to protect the inner walls of the cylindrical metal lower electrode. A sacrificial insulating layer is patterned to form an aperture for forming the lower electrode. A metal lower electrode layer and the metal capping layer are sequentially formed. In order to electrically separate adjacent metal lower electrodes from each other, the metal capping layer and the metal lower electrode layer are simultaneously planarized until the sacrificial insulating layer is exposed. The sacrificial insulating layer and the metal capping layer that resides in the aperture are removed such that the cylindrical metal lower electrode having inner and outer walls is completed. Therefore, it is possible to simultaneously palanarize the metal capping layer and the metal lower electrode layer with respect to the sacrificial insulating layer such that it is possible to simplify processes for forming the lower electrodes.
    • 一种形成电容器的圆柱形下电极的方法,其中金属用作电容器的下电极。 为了保护圆柱形金属下电极的内壁,使用金属覆盖层。 图案化牺牲绝缘层以形成用于形成下电极的孔。 依次形成金属下电极层和金属覆盖层。 为了将相邻的金属下电极彼此电分离,金属覆盖层和金属下电极层同时被平坦化,直到牺牲绝缘层暴露。 除去驻留在孔中的牺牲绝缘层和金属覆盖层,使得具有内壁和外壁的圆柱形金属下电极完成。 因此,可以相对于牺牲绝缘层同时进行金属覆盖层和金属下电极层的平坦化,使得可以简化用于形成下电极的工艺。