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    • 2. 发明授权
    • Method for forming a dielectric tantalum nitride layer as an
anti-reflective coating (ARC)
    • 形成作为抗反射涂层(ARC)的电介质氮化钽层的方法
    • US5741626A
    • 1998-04-21
    • US632209
    • 1996-04-15
    • Ajay JainKevin Lucas
    • Ajay JainKevin Lucas
    • G03F7/09H01L21/027H01L21/768G03F7/00H01L21/314
    • H01L21/76829G03F7/091H01L21/0276H01L21/76807H01L21/7681H01L21/76813
    • The present invention provides an anti-reflective Ta.sub.3 N.sub.5 coating which can be used in a dual damascene structure and for I line or G line lithographies. In addition, the Ta.sub.3 N.sub.5 coating may also be used as an etch stop and a barrier layer. A dual damascene structure is formed by depositing a first dielectric layer (16). A dielectric tantalum nitride layer (18) is deposited on top of the first dielectric layer. A second dielectric layer (20) is deposited on the tantalum nitride layer. A dual damascene opening (34) is etched into the dielectric layers by patterning a first opening portion (26) and a second opening portion (32) using photolithography operations. Dielectric tantalum nitride layer (18) serves as an ARC layer during these operations to reduce the amount of reflectance from conductive region (14) to reduce distortion of the photoresist pattern. The use of a dielectric tantalum nitride layer as an ARC is particularly suitable for I line and G line lithography.
    • 本发明提供了可用于双镶嵌结构和I线或G线平版印刷的抗反射Ta3N5涂层。 此外,Ta3N5涂层也可以用作蚀刻停止层和阻挡层。 通过沉积第一介电层(16)形成双镶嵌结构。 电介质氮化钽层(18)沉积在第一介电层的顶部。 第二介电层(20)沉积在氮化钽层上。 通过使用光刻操作图案化第一开口部分(26)和第二开口部分(32),将双镶嵌开口(34)蚀刻到电介质层中。 在这些操作期间,介电氮化钽层(18)用作ARC层,以减少来自导电区域(14)的反射率,以减少光致抗蚀剂图案的变形。 使用电介质氮化钽层作为ARC特别适用于I线和G线光刻。