Dram peripheral circuit contact aspect ratio improvement process
    34.
    发明授权
    Dram peripheral circuit contact aspect ratio improvement process 失效
    戏剧外围电路接触宽高比改善过程

    公开(公告)号:US5270243A

    公开(公告)日:1993-12-14

    申请号:US35232

    申请日:1993-03-22

    CPC classification number: H01L27/10852

    Abstract: A method and resulting structure for defining a dielectric layer thickness and etching openings having a desired aspect ratio through said dielectric layer covering regions in the peripheral circuits of a DRAM integrated circuit to be electrically contacted in a semiconductor wafer is described. The DRAM integrated circuit including the peripheral circuits to be electrically contacted is provide in the semiconductor wafer. A first conductive polysilicon layer is formed over said DRAM integrated circuit and the layer is patterned to leave the layer over the peripheral circuits. A first interlevel dielectric layer is formed over the polysilicon layer which has been patterned. A second conductive polysilicon layer is formed over the first interlevel dielectric layer and patterned to leave the layer over areas other than the peripheral circuits. The first interlevel dielectric layer and first polysilicon layer thereunder are masked and etched to remove the first interlevel dielectric layer and first polysilicon layer from all the peripheral circuits. A second interlevel dielectric layer is formed over the exposed second conductive polysilicon layer, first interlevel dielectric and semiconductor wafer. The openings having a desired aspect ratio are etched through said second interlevel dielectric layer.

    Abstract translation: 描述了一种用于限定介电层厚度的方法和结果,并且通过在半导体晶片中电接触的DRAM集成电路的外围电路中的所述介电层覆盖区域蚀刻具有期望的纵横比的开口。 在半导体晶片中提供包括要电接触的外围电路的DRAM集成电路。 在所述DRAM集成电路上形成第一导电多晶硅层,并且对该层进行图案化以将层留在外围电路上。 在图案化的多晶硅层上形成第一层间电介质层。 第二导电多晶硅层形成在第一层间电介质层之上,并被图案化以将层留在外围电路以外的区域上。 对其之下的第一层间介质层和第一多晶硅层进行掩模蚀刻以从所有外围电路去除第一层间介质层和第一多晶硅层。 在暴露的第二导电多晶硅层,第一层间介质和半导体晶片之上形成第二层间电介质层。 通过所述第二层间介质层蚀刻具有期望的纵横比的开口。

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