Method for planarizing DRAM cells
    1.
    发明授权
    Method for planarizing DRAM cells 失效
    平面化DRAM单元的方法

    公开(公告)号:US06174815B1

    公开(公告)日:2001-01-16

    申请号:US08957813

    申请日:1997-10-27

    CPC classification number: H01L21/31055 H01L21/316 H01L21/31625 H01L27/10852

    Abstract: A method for planarizing DRAM cells comprising the steps of providing a silicon substrate having a field oxide layer, an oxide layer and a capacitor formed thereon, then forming a first dielectric layer over the substrate. Next, portions of the first dielectric layer is etched back to form a spacer layer, and then a second dielectric layer is formed over the spacer layer. Thereafter, an insulating layer is formed over the second dielectric layer. Finally, the insulating layer is fully etched back to form a third dielectric layer.

    Abstract translation: 一种用于平坦化DRAM单元的方法,包括以下步骤:提供具有场氧化物层,氧化物层和形成在其上的电容器的硅衬底,然后在衬底上形成第一介电层。 接下来,将第一电介质层的部分进行回蚀以形成间隔层,然后在隔离层上形成第二电介质层。 此后,在第二电介质层上形成绝缘层。 最后,绝缘层被完全回蚀以形成第三电介质层。

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