Method for reducing argon diffusion from high density plasma films
    1.
    发明申请
    Method for reducing argon diffusion from high density plasma films 有权
    降低高密度等离子体膜的氩扩散的方法

    公开(公告)号:US20060154491A1

    公开(公告)日:2006-07-13

    申请号:US11034952

    申请日:2005-01-13

    IPC分类号: H01L21/44 H01L21/31

    摘要: A two-step high density plasma-CVD process is described wherein the argon content in the film is controlled by using two different argon concentrations in the argon/silane/oxygen gas mixture used for generating the high density plasma. The first step deposition uses high argon concentration and low sputter etch-to-deposition (E/D) ratio. High E/D ratio maintains the gap openings without necking. In the second step, a lower argon concentration and lower E/D ratio are used. Since observed metal defects are caused by argon diffusion in the top 200-300 nm of the HDP-CVD film, by controlling argon concentration in the top part of the film (i.e. second step deposition) to a low value, a reduced number of metal defects are achieved.

    摘要翻译: 描述了两步高密度等离子体CVD工艺,其中通过在用于产生高密度等离子体的氩/硅烷/氧气混合物中使用两种不同的氩浓度来控制膜中的氩含量。 第一步沉积使用高氩浓度和低溅射蚀刻至沉积(E / D)比。 高E / D比保持间隙开口没有颈缩。 在第二步中,使用较低的氩浓度和较低的E / D比。 由于观察到的金属缺陷是通过在HDP-CVD膜的顶部200-300nm的氩扩散引起的,通过将膜顶部的氩浓度(即第二步沉积)控制到低值,减少数量的金属 实现了缺陷。