Multistep method of depositing metal seed layers
    4.
    发明授权
    Multistep method of depositing metal seed layers 有权
    多步法沉积金属种子层

    公开(公告)号:US07682966B1

    公开(公告)日:2010-03-23

    申请号:US11701984

    申请日:2007-02-01

    IPC分类号: H01L23/535

    摘要: Metal seed layers are deposited on a semiconductor substrate having recessed features by a method that involves at least three operations. In this method, a first layer of metal is deposited onto the substrate to cover at least the bottom portions of the recessed features. The first layer of metal is subsequently redistributed to improve sidewall coverage of the recessed features. Next, a second layer of metal is deposited on at least the field region of the substrate and on the bottom portions of the recessed features. The method can be implemented using a PVD apparatus that allows deposition and resputtering operations. This sequence of operations can afford seed layers with improved step coverage. It also leads to decreased formation of voids in interconnects, and to improved resistance characteristics of formed IC devices.

    摘要翻译: 通过涉及至少三个操作的方法将金属种子层沉积在具有凹陷特征的半导体衬底上。 在该方法中,第一金属层沉积在基底上以至少覆盖凹陷特征的底部。 随后重新分布第一金属层以改善凹陷特征的侧壁覆盖。 接下来,在衬底的至少场区域和凹陷特征的底部上沉积第二层金属。 该方法可以使用允许沉积和重新溅射操作的PVD装置来实现。 这种操作顺序可以提供具有改进的台阶覆盖率的种子层。 它还导致互连中空隙的形成减少,并改善形成的IC器件的电阻特性。