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    • 10. 发明授权
    • Method for forming lower electrode of cylinder-shaped capacitor preventing twin bit failure
    • 用于形成圆柱形电容器的下电极的方法,其防止双位故障
    • US06458653B1
    • 2002-10-01
    • US10040866
    • 2001-12-27
    • Se-Myeong Jang
    • Se-Myeong Jang
    • H01L218242
    • H01L28/91H01L21/76804
    • A method for forming a lower electrode of a cylinder-shaped capacitor is provided to prevent etch skew and twin bit failure. The method includes sequentially forming a buffer layer and an etch stopper on a semiconductor substrate including a conductive region, forming a sacrificial dielectric layer on the etch stopper, forming a first opening within the sacrificial dielectric layer by etching a portion of the sacrificial dielectric layer using the etch stopper, depositing a slope-improving layer for improving sidewall slope of the first opening, forming a second opening by etching a portion of the slope-improving layer, the etch stopper and the buffer layer under the first opening and exposing the conductive region to which the cylinder-shaped capacitor is electrically connected, depositing a conductive layer for forming cylinder-shaped lower electrodes on a surface of the second opening, and forming the cylinder-shaped lower electrodes separated from each other.
    • 提供一种用于形成圆柱形电容器的下电极的方法,以防止蚀刻偏斜和双位故障。 该方法包括在包括导电区域的半导体衬底上顺序地形成缓冲层和蚀刻停止层,在蚀刻停止层上形成牺牲介电层,通过用牺牲介电层中的一部分蚀刻牺牲介电层的一部分, 蚀刻停止器,沉积用于改善第一开口的侧壁倾斜度的斜坡改进层,通过蚀刻斜面改善层的一部分,蚀刻停止层和第一开口下方的缓冲层形成第二开口,并使导电区域 所述圆筒形电容器电连接到所述第一开口,在所述第二开口的表面上沉积用于形成圆柱形下电极的导电层,并且形成彼此分离的所述圆筒形下电极。