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    • 3. 发明申请
    • A METHOD OF ETCHING FERROELECTRIC DEVICES
    • 一种蚀刻电介质器件的方法
    • WO2004077541A2
    • 2004-09-10
    • PCT/SG2004000034
    • 2004-02-09
    • INFINEON TECHNOLOGIES AGEGGER ULRICHZHUANG HAORENBRUCHHAUS RAINER
    • EGGER ULRICHZHUANG HAORENBRUCHHAUS RAINER
    • H01L21/02H01L21/311H01L21/3213
    • H01L21/32139H01L21/31122H01L21/32136H01L28/55H01L28/60
    • A method of etching a ferroelectric device (100) having a ferroelectric layer (112) between a top and a bottom electrode (114, 108) is disclosed herein. Hardmasks (116, 118) are deposited on the top electrode (114), two or more hardmasks being spaced apart by narrow first regions (115) and spaced apart from other hardmasks by wider second regions (117). The top electrode (114) and ferroelectric layer (112) are then etched to pattern the top electrode (114) thus forming capacitors (102, 104), and the bottom electrode (108) is etched by a process in which the second regions are etched more slowly than the second regions. Those capacitors having a first region between them have a common bottom electrode (108), but in the second regions the bottom electrode is severed. To pattern the bottom electrode (108), a fluorine-based chemistry followed thereafter by a CO-based chemistry are used in a two step etching process.
    • 本文公开了一种在顶部电极和底部电极(114,108)之间蚀刻具有铁电体层(112)的铁电体元件(100)的方法。 硬掩模(116,118)沉积在顶部电极(114)上,两个或更多个硬掩模由窄的第一区域(115)间隔开,并且由较宽的第二区域(117)与其它硬掩模隔开。 然后蚀刻顶部电极(114)和铁电体层(112)以对顶部电极(114)进行图案,从而形成电容器(102,104),并且通过其中第二区域 蚀刻比第二区域更缓慢。 那些在它们之间具有第一区域的电容器具有共同的底部电极(108),但是在第二区域中,底部电极被切断。 为了对底部电极(108)进行图案化,其后采用基于CO的化学物质的氟基化学物质用于两步蚀刻工艺。