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公开(公告)号:US08613863B2
公开(公告)日:2013-12-24
申请号:US13305949
申请日:2011-11-29
申请人: Jinhong Tong , Frederick Fulgenico , ShouQian Shao
发明人: Jinhong Tong , Frederick Fulgenico , ShouQian Shao
CPC分类号: H01L21/3065 , H01L21/31116 , H01L21/32134 , H01L27/2409 , H01L27/2463 , H01L45/08 , H01L45/1233 , H01L45/1253 , H01L45/146 , H01L45/16 , H01L45/1675
摘要: A method is disclosed for the selective etching of a multi-layer metal oxide stack comprising a platinum or tungsten layer on a TiN layer on an HfO2 or ZrO2 layer on a silicon substrate. In some embodiments, the method comprises a physical sputter process to selectively etch the platinum layer, followed by a first wet etch using a mixture of NH4OH and H2O2 to selectively etch the TiN layer, and a second wet etch using a dilute mixture of HF and HCl to selectively etch the HfO2 or ZrO2 layer.
摘要翻译: 公开了一种用于在硅衬底上的HfO 2或ZrO 2层上的TiN层上选择性蚀刻包括铂或钨层的多层金属氧化物堆叠的方法。 在一些实施例中,该方法包括用于选择性蚀刻铂层的物理溅射工艺,接着使用NH 4 OH和H 2 O 2的混合物进行第一次湿式蚀刻以选择性地蚀刻TiN层,以及使用HF和 HCl以选择性地蚀刻HfO 2或ZrO 2层。