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    • 6. 发明授权
    • Method for achieving increased control over interconnect line thickness across a wafer and between wafers
    • 用于实现跨晶片和晶片之间的互连线厚度的增加的控制的方法
    • US07122465B1
    • 2006-10-17
    • US11003208
    • 2004-12-02
    • Boon-Yong AngCinti Xiaohua ChenSimon S. ChanInkuk Kang
    • Boon-Yong AngCinti Xiaohua ChenSimon S. ChanInkuk Kang
    • H01L21/4763
    • H01L21/76816H01L21/3212H01L21/7684
    • According to one exemplary embodiment, a method comprises a step of etching a trench in an ILD layer, said trench having sidewalls and a bottom surface. The method further comprises determining a height of the sidewalls of the trench. The method further comprises filling the trench with interconnect metal such the interconnect metal extends above the trench. According to this exemplary embodiment, the method further comprises performing a CMP process to remove a portion of the interconnect metal. In the present invention, the height of the sidewalls of the trench is utilized to control an amount of polishing performed in the CMP process. The remaining portion of interconnect metal in the trench forms an interconnect line, where the thickness of the interconnect line is controlled by utilizing the height of the sidewalls of the trench to control the amount of polishing in the CMP process.
    • 根据一个示例性实施例,一种方法包括蚀刻ILD层中的沟槽的步骤,所述沟槽具有侧壁和底表面。 该方法还包括确定沟槽的侧壁的高度。 该方法还包括用互连金属填充沟槽,使得互连金属在沟槽之上延伸。 根据该示例性实施例,该方法还包括执行CMP处理以去除互连金属的一部分。 在本发明中,利用沟槽侧壁的高度来控制在CMP工艺中执行的抛光量。 沟槽中的互连金属的剩余部分形成互连线,其中通过利用沟槽的侧壁的高度来控制互连线的厚度以控制CMP工艺中的抛光量。