Defect and etch rate control in trench etch for dual damascene patterning of low-k dielectrics
    2.
    发明授权
    Defect and etch rate control in trench etch for dual damascene patterning of low-k dielectrics 有权
    对于低k电介质的双镶嵌图案,沟槽蚀刻中的缺陷和蚀刻速率控制

    公开(公告)号:US06455411B1

    公开(公告)日:2002-09-24

    申请号:US09947966

    申请日:2001-09-06

    IPC分类号: H01L21308

    摘要: A dual damascene process for low-k or ultra low-k dielectric such as organo-silicate glass (OSG). After the via (112) etch, a trench (121) is etched in the OSG layer (108) using a less-polymerizing fluorocarbon added to an etch chemistry comprising a fluorocarbon and low N2/Ar ratio. The low N2/Ar ratio controls ridge formation during the trench etch. The combination of a less-polymerizing fluorocarbon with a higher-polymerizing fluorocarbon achieves a high etch rate and defect-free conditions.

    摘要翻译: 用于低k或超低k电介质的双镶嵌工艺,如有机硅酸盐玻璃(OSG)。 在通孔(112)蚀刻之后,使用添加到包含碳氟化合物和低N 2 / Ar比的蚀刻化学品中的较少聚合的碳氟化合物在OSG层(108)中蚀刻沟槽(121)。 低N 2 / Ar比控制沟槽蚀刻期间的脊形成。 低聚碳氟化合物与较高聚合碳氟化合物的组合实现了高蚀刻速率和无缺陷条件。

    Method of forming dual-damascene structure

    公开(公告)号:US06774031B2

    公开(公告)日:2004-08-10

    申请号:US10732665

    申请日:2003-12-08

    IPC分类号: H01L214763

    CPC分类号: H01L21/76808

    摘要: A first dielectric layer (30) and a second dielectric layer (40) are formed over an etch stop layer (20). A hardmask layer (50) is formed over the second dielectric layer and a via (62) is formed in the first dielectric layer (30) and the second dielectric layer (40). A trench (85) is formed mostly in the second dielectric layer (40) by fully or partially removing BARC from the via (62) are partially etching the trench (85) and prior to completion of the trench etch process.