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    • 19. 发明授权
    • Capacitor fabrication method
    • 电容器制造方法
    • US06784068B2
    • 2004-08-31
    • US10634550
    • 2003-08-05
    • Kee Jeung LeeHai Won Kim
    • Kee Jeung LeeHai Won Kim
    • H01L2120
    • H01L27/10852H01L21/31116H01L27/10817H01L28/84H01L28/90
    • A capacitor is fabricated over a first layer having a first conductive plug formed on a substrate in a semiconductor memory. On the first layer, a silicon nitride film, a first capacitor oxide film, and a second oxide film are sequentially formed. The first and the second oxide films have different wet etch rates. Dry and wet etchings are sequentially performed to the first and second oxide films to form a second contact hole. The second contact hole is then etched. Thereafter, a silicon film and a filler film are sequentially formed on the resultant surface of the structure. A cylindrical storage node electrode is then formed by etching a predetermined portion of the filler film and the silicon film. After removing the remaining filler film and the oxide films, a Ta2O5 dielectric film covering the storage node electrode and a TiN film for an upper electrode are then sequentially formed.
    • 在半导体存储器中的在衬底上形成的第一导电插塞的第一层上制造电容器。 在第一层上,依次形成氮化硅膜,第一电容器氧化膜和第二氧化物膜。 第一和第二氧化膜具有不同的湿蚀刻速率。 依次对第一和第二氧化物膜进行干蚀刻和湿蚀刻以形成第二接触孔。 然后蚀刻第二接触孔。 此后,在结构的所得表面上依次形成硅膜和填充膜。 然后通过蚀刻填充膜和硅膜的预定部分来形成圆柱形存储节点电极。 在除去剩余的填充膜和氧化物膜之后,依次形成覆盖存储节点电极的Ta 2 O 5电介质膜和用于上部电极的TiN膜。