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    • 17. 发明授权
    • Damascene arrangement for metal interconnection using low k dielectric constant materials for etch stop layer
    • 用于蚀刻停止层的低k介电常数材料的金属互连的镶嵌装置
    • US06417090B1
    • 2002-07-09
    • US09225008
    • 1999-01-04
    • Fei WangLu You
    • Fei WangLu You
    • H01L214763
    • H01L21/76802H01L21/31116H01L21/31138H01L21/76829
    • A method of forming a damascene structure in a semiconductor device arrangement uses a low k dielectric material in an etch stop layer that overlays a metal interconnect layer. The etch stop layer protects the metal interconnect layer, made of copper, for example, during the etching of a dielectric layer that overlays the etch stop layer. Following the etching of the dielectric layer, which stops on the etch stop layer, the etch stop layer is then etched with a chemistry that does not damage the underlying copper in the metal interconnect layer. The lower dielectric constant material employed in the etch stop layer reduces the overall dielectric constant of the film, thereby improving the operating performance of the chip.
    • 在半导体器件布置中形成镶嵌结构的方法使用覆盖金属互连层的蚀刻停止层中的低k电介质材料。 蚀刻停止层例如在蚀刻覆盖在蚀刻停止层的介电层的蚀刻期间保护由铜制成的金属互连层。 在蚀刻停止层上停止的介电层的蚀刻之后,用不会损坏金属互连层中的下面的铜的化学物质蚀刻蚀刻停止层。 在蚀刻停止层中使用的较低介电常数材料降低了膜的总介电常数,从而提高了芯片的操作性能。
    • 18. 发明授权
    • Method for reduced gate aspect ratio to improve gap-fill after spacer etch
    • 减小栅极纵横比以改善间隔物刻蚀之后的间隙填充的方法
    • US06376309B2
    • 2002-04-23
    • US09811288
    • 2001-03-16
    • John JianShi WangKent Kuohua ChangHao FangLu You
    • John JianShi WangKent Kuohua ChangHao FangLu You
    • H01L29788
    • H01L27/11521H01L21/76837H01L27/115
    • The present invention provides a method for reducing the gate aspect ratio of a flash memory device. The method includes forming a tunnel oxide layer on a substrate; forming a polysilicon layer on the tunnel oxide layer; forming an insulating layer on the polysilicon layer; forming a control gate layer on the polysilicon layer; etching at least the tunnel oxide layer, the insulating layer, and the control gate layer to form at least two stack structures; forming a plurality of spacers at sides of the at least two stack structures; and filling at least one gap between the at least two stack structures with an oxide, where the control gate layer provides a gate aspect ratio which allows for a maximum step coverage by the oxide. In a preferred embodiment, the method uses nickel silicide instead of the conventional tungsten silicide in the control gate layers of the cells of the device. Nickel silicide has higher conductivity than conventional silicides, thus a thinner layer of nickel silicide may be used without sacrificing performance. Nickel silicide also has a lower barrier height for holes, thus maintaining a low contact resistance. With a thinner nickel silicide layer, the gate aspect ratio of the cells are lowered, allowing for a maximum step coverage by the gap-filling oxide. The reliability of the device is thus improved.
    • 本发明提供一种降低闪速存储器件的栅极纵横比的方法。 该方法包括在衬底上形成隧道氧化物层; 在隧道氧化层上形成多晶硅层; 在所述多晶硅层上形成绝缘层; 在所述多晶硅层上形成控制栅极层; 至少蚀刻隧道氧化物层,绝缘层和控制栅极层以形成至少两个堆叠结构; 在所述至少两个堆叠结构的侧面处形成多个间隔物; 以及用所述氧化物填充所述至少两个堆叠结构之间的至少一个间隙,其中所述控制栅极层提供允许所述氧化物的最大阶跃覆盖的栅极纵横比。 在优选实施例中,该方法在装置的电池的控制栅极层中使用硅化镍代替常规的硅化钨。 硅化镍具有比常规硅化物更高的导电性,因此可以使用更薄的硅化镍层而不牺牲性能。 硅化镍也具有较低的孔的阻挡高度,因此保持低的接触电阻。 利用更薄的硅化镍层,电池的栅极纵横比降低,允许通过间隙填充氧化物的最大阶梯覆盖。 因此提高了装置的可靠性。