절연막의 에칭 방법
    11.
    发明授权
    절연막의 에칭 방법 有权
    绝缘膜的蚀刻方法

    公开(公告)号:KR100782632B1

    公开(公告)日:2007-12-06

    申请号:KR1020037008446

    申请日:2001-12-13

    CPC classification number: H01L21/31116 H01L21/31056

    Abstract: A mixed gas containing at least a first fluorocarbon gas having C>=4 and a C/F ratio of 0.625 or higher, a second fluorocarbon gas having F>=4 and a C/F ratio of 0.5 or lower, an Ar gas, and an O2 gas is used as an etching gas to etch an insulating film formed of a silicon oxide film or the like. This can improve an etching rate and a resist mask selection ratio, and in addition, prevent the formation of a contact hole in a bowing shape even when a high-aspect-ratio contact hole is formed.

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