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公开(公告)号:US20110171833A1
公开(公告)日:2011-07-14
申请号:US13072904
申请日:2011-03-28
IPC分类号: H01L21/302
CPC分类号: H01L21/31122
摘要: An object of the invention is to provide a dry etching method of a metal oxide High-k film having etching characteristics which achieve a small etching rate difference and a small profile difference between open area and dense area while keeping a high selectivity to a polysilicon underlying film. In the method of dry-etching a High-k film by using a plasma, a small amount of fluorocarbon gas having a high carbon ratio is added to a BCl3 gas mixed with a rare gas.
摘要翻译: 本发明的目的是提供一种具有蚀刻特性的金属氧化物High-k膜的干蚀刻方法,其具有小的蚀刻速率差异以及开放区域和致密区域之间的微小差异,同时保持对多晶硅的高选择性 电影。 在使用等离子体干法蚀刻High-k膜的方法中,将少量碳含量高的碳氟化合物气体加入到与稀有气体混合的BCl 3气体中。