干式蚀刻法
    25.
    发明授权

    公开(公告)号:CN102484066B

    公开(公告)日:2014-11-19

    申请号:CN201180003426.7

    申请日:2011-01-25

    Abstract: 公开了一种干式蚀刻方法,包括第一步骤和第二步骤。第一步骤包括从混合气体生成第一种等离子体,并用所述第一种等离子体在硅层(Ls)进行各向异性蚀刻在其上形成凹槽,所述混合气体包括氧化气体和含氟气体;第二步骤包括交替地重复使用第二种等离子体在凹槽内侧表面形成有机膜的有机膜形成过程以及使用第一种等离子体在覆盖了有机膜的凹槽中进行各向异性蚀刻的蚀刻过程。当蚀刻阻挡层(Lo)从第一步骤形成的凹槽底部表面的部分露出来时,将第一步骤切换至第二步骤。

    干式蚀刻法
    27.
    发明公开

    公开(公告)号:CN102484066A

    公开(公告)日:2012-05-30

    申请号:CN201180003426.7

    申请日:2011-01-25

    Abstract: 公开了一种干式蚀刻方法,包括第一步骤和第二步骤。第一步骤包括从混合气体生成第一种等离子体,并用所述第一种等离子体在硅层(Ls)进行各向异性蚀刻在其上形成凹槽,所述混合气体包括氧化气体和含氟气体;第二步骤包括交替地重复使用第二种等离子体在凹槽内侧表面形成有机膜的有机膜形成过程以及使用第一种等离子体在覆盖了有机膜的凹槽中进行各向异性蚀刻的蚀刻过程。当蚀刻阻挡层(Lo)从第一步骤形成的凹槽底部表面的部分露出来时,将第一步骤切换至第二步骤。

    METHOD FOR RECESS ETCHING IN MICROMECHANICAL DEVICES

    公开(公告)号:EP3409639A1

    公开(公告)日:2018-12-05

    申请号:EP18174480.6

    申请日:2018-05-28

    Inventor: FUJII, Hidetoshi

    Abstract: The disclosure relates to a method for manufacturing recessed micromechanical structures in a MEMS device wafer. First vertical trenches in the device wafer define the horizontal dimensions of both level and recessed structures. The horizontal face of the device wafer and the vertical sidewalls of the first vertical trenches are then covered with a self-supporting etching mask which is made of a self-supporting mask material, which is sufficiently rigid to remain standing vertically in the location where it was deposited even as the sidewall upon which it was deposited is etched away. Recess trenches are then etched under the protection of the self-supporting mask. The method allows a spike-preventing aggressive etch to be used for forming the recess trenches, without harming the sidewalls in the first vertical trenches.

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