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    • 7. 发明授权
    • Damascene interconnect with bi-layer capping film
    • 大马士革与双层封盖膜相互连接
    • US06873057B2
    • 2005-03-29
    • US10248750
    • 2003-02-14
    • Jei-Ming ChenYi-Fang ChiangChih-Chien Liu
    • Jei-Ming ChenYi-Fang ChiangChih-Chien Liu
    • H01L21/311H01L21/44H01L21/4763H01L21/768H01L23/48H01L23/52
    • H01L21/76883H01L21/76832H01L21/76834H01L21/76835
    • A damascene interconnect structure with a bi-layer capping film is provided. The damascene interconnect structure comprises a semiconductor layer and a dielectric layer disposed on the semiconductor layer. The dielectric layer has a main surface and at least one damascened recess provided on the main surface. A copper wire is embedded in the damascened recess. The copper wire has a chemical mechanical polished upper surface, which is substantially co-planar with the main surface of the dielectric layer. After polishing the upper surface of the copper wire, the upper surface is pre-treated and reduced in a conductive plasma environment at a temperature of below 300° C. A bi-layer capping film is thereafter disposed on the upper surface of the copper wire. The bi-layer capping film consists of a lower HDPCVD silicon nitride layer and an upper doped silicon carbide layer.
    • 提供具有双层封盖膜的镶嵌互连结构。 镶嵌互连结构包括设置在半导体层上的半导体层和介电层。 电介质层具有主表面和设置在主表面上的至少一个镶嵌凹部。 铜丝嵌入镶嵌的凹槽中。 铜线具有化学机械抛光的上表面,其与电介质层的主表面基本上共面。 在抛光铜线的上表面之后,在低于300℃的温度下,在导电等离子体环境中对上表面进行预处理和还原。然后在铜线的上表面上设置双层封盖膜 。 双层封盖膜由较低的HDPCVD氮化硅层和上掺杂碳化硅层组成。