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    • 8. 发明授权
    • Method to control dual damascene trench etch profile and trench depth uniformity
    • 控制双镶嵌沟槽蚀刻轮廓和沟槽深度均匀性的方法
    • US07247555B2
    • 2007-07-24
    • US10767292
    • 2004-01-29
    • Hai CongYong Kong SiewLiang Choo Hsia
    • Hai CongYong Kong SiewLiang Choo Hsia
    • H01L21/4763H01L21/44
    • H01L21/76808
    • A method of forming trench openings in a dual damascene trench and via etch process by using a two component hard mask layer, termed a bi-layer, over different intermetal dielectrics, IMD, to solve dual damascene patterning problems, such as, fencing and sub-trench formation. Via first patterning in dual damascene processing is one of the major integration schemes for copper backend of line (BEOL) integration. Via first dual damascene scheme usually uses a hard mask layer deposited on top of an inter-metal dielectric (IMD) film stack. The dual damascene trench etch requires uniform trench depth across wafer after etch. In addition, via top corner profiles need to be well maintained without any fencing or faceting. The present method solves these problems by using a two component hard mask layer, termed a bi-layer, deposited directly on top of an inter-metal dielectric (IMD) film stack.
    • 一种在双镶嵌沟槽和通孔蚀刻工艺中形成沟槽开口的方法,其通过使用称为双层的双组分硬掩模层在不同的金属间电介质IMD之间,以解决双镶嵌图案化问题,例如栅栏和子层 螺旋形成。 通过在双镶嵌处理​​中的首次图案化是铜后端(BEOL)集成的主要集成方案之一。 通过第一双镶嵌方案通常使用沉积在金属间电介质(IMD)膜堆叠顶部上的硬掩模层。 双镶嵌沟槽蚀刻需要在蚀刻后跨晶片的均匀沟槽深度。 此外,通过顶角型材需要维护良好,没有任何围栏或小面。 本方法通过使用直接沉积在金属间电介质(IMD)膜堆叠的顶部上的双组分硬掩模层来解决这些问题。
    • 9. 发明授权
    • Modified buried contact process for IC device fabrication
    • 用于IC器件制造的改进的埋入接触工艺
    • US6121135A
    • 2000-09-19
    • US314591
    • 1999-05-19
    • Yong Kong SiewLap Chan
    • Yong Kong SiewLap Chan
    • H01L21/768H01L21/44
    • H01L21/76895
    • A new method of forming a butted contact and a buried contact having low contact resistance in the fabrication of integrated circuits is described. A first layer of polysilicon is deposited over a gate silicon oxide layer over the surface of a semiconductor substrate. The first polysilicon and gate oxide layers are etched away to provide an opening to the substrate. A second polysilicon layer is deposited over the first polysilicon layer and the substrate within the opening and doped whereby the buried contact junction is formed in the substrate underlying the doped second polysilicon layer. The second polysilicon layer is planarized. The first and second polysilicon layers are etched away to provide an opening overlying a portion of the buried contact junction wherein a trench is etched into the substrate where the substrate is not covered by the gate oxide layer. An oxide layer is deposited over the second polysilicon layer and within the trench. The oxide layer is etched away wherein the trench and a portion of the second polysilicon layer overlying the buried contact junction and adjacent to the trench are exposed and whereby the oxide is removed from the trench. A third polysilicon layer is deposited over the oxide layer and the second polysilicon layer and the trench exposed within the opening. The third polysilicon layer is patterned to form a butted contact with the second polysilicon layer exposed within the opening.
    • 描述了在集成电路的制造中形成具有低接触电阻的对接触点和埋入触点的新方法。 第一层多晶硅沉积在半导体衬底的表面上的栅极氧化硅层上。 蚀刻掉第一多晶硅和栅极氧化物层以提供对衬底的开口。 第二多晶硅层沉积在开口内的第一多晶硅层和衬底上,并且被掺杂,由此在掺杂的第二多晶硅层下面的衬底中形成掩埋接触结。 第二多晶硅层被平坦化。 蚀刻掉第一和第二多晶硅层以提供覆盖掩埋接触结的一部分的开口,其中将沟槽蚀刻到衬底中,其中衬底未被栅极氧化物层覆盖。 氧化物层沉积在第二多晶硅层上并在沟槽内。 蚀刻掉氧化物层,其中将沟槽和覆盖在掩埋接触结上并与沟槽相邻的第二多晶硅层的一部分被暴露,从而从沟槽去除氧化物。 第三多晶硅层沉积在氧化物层上,第二多晶硅层和暴露在开口内的沟槽。 图案化第三多晶硅层以与在开口内暴露的第二多晶硅层形成对接接触。