Method for manufacturing non volatile memory cells
    1.
    发明公开
    Method for manufacturing non volatile memory cells 审中-公开
    Verfahren zur Herstellung von Festwertspeicherzellen

    公开(公告)号:EP1804294A1

    公开(公告)日:2007-07-04

    申请号:EP05425943.7

    申请日:2005-12-30

    CPC classification number: H01L27/11521 H01L21/28273 H01L27/115

    Abstract: Method for manufacturing non volatile memory cells integrated on a semiconductor substrate (100), each one comprising a floating gate electrode (110), the method comprising the steps of:
    - depositing at least one protective layer (30) on the semiconductor substrate (100),
    - forming a first plurality of openings (40) in the protective layer (30),
    - etching the semiconductor substrate (100) through the first plurality of openings (40) so as to form a plurality of trenches (60),
    - filling in the plurality of trenches (60) and the first plurality of openings (40) by means of an insulation layer (70),
    - etching surface portions of the protective layer (30) to form:
    - surface portions (71) of the insulation layer (70) projecting from the semiconductor substrate (100) divided from each other by a second plurality of openings (72), and
    - lower portions (31) of the protection layer (30) confined below the second plurality of openings (72),

    - etching the insulation layer (70) to reduce the cross dimensions of the surface portions (71) of the insulation layer (70),
    - removing the lower portions (31) of said protection layer (30) until the semiconductor substrate (100) is exposed.

    Abstract translation: 一种用于制造集成在半导体衬底(100)上的非易失性存储单元的方法,每个包括浮置栅电极(110),所述方法包括以下步骤: - 在半导体衬底(100)上沉积至少一个保护层(30) ), - 在所述保护层(30)中形成第一多个开口(40), - 通过所述第一多个开口(40)蚀刻所述半导体衬底(100),以形成多个沟槽(60), - 通过绝缘层(70)填充所述多个沟槽(60)和所述第一多个开口(40), - 蚀刻所述保护层(30)的表面部分以形成: - 所述保护层(30)的表面部分(71) 通过第二多个开口(72)从半导体衬底(100)突出的绝缘层(70),以及限定在第二多个开口(72)下方的保护层(30)的下部(31) ), - 蚀刻绝缘层(70)以减少交叉 绝缘层(70)的表面部分(71)的尺寸, - 去除所述保护层(30)的下部(31)直到半导体衬底(100)暴露。

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