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    • 7. 发明授权
    • Structures and methods for low-k or ultra low-k interlayer dielectric pattern transfer
    • 低k或超低k层间电介质图案转移的结构和方法
    • US07695897B2
    • 2010-04-13
    • US11429709
    • 2006-05-08
    • James J. BucchignanoGerald W. GibsonMary B. RothwellRoy R. Yu
    • James J. BucchignanoGerald W. GibsonMary B. RothwellRoy R. Yu
    • G03F7/00G03F7/26
    • H01L21/31144H01L21/76802H01L21/76813
    • The present invention relates to improved methods and structures for forming interconnect patterns in low-k or ultra low-k (i.e., having a dielectric constant ranging from about 1.5 to about 3.5) interlevel dielectric (ILD) materials. Specifically, reduced lithographic critical dimensions (CDs) (i.e., in comparison with target CDs) are initially used for forming a patterned resist layer with an increased thickness, which in turn allows use of a simple hard mask stack comprising a lower nitride mask layer and an upper oxide mask layer for subsequent pattern transfer. The hard mask stack is next patterned by a first reactive ion etching (RIE) process using an oxygen-containing chemistry to form hard mask openings with restored CDs that are substantially the same as the target CDs. The ILD materials are then patterned by a second RIE process using a nitrogen-containing chemistry to form the interconnect pattern with the target CDs.
    • 本发明涉及用于形成低k或超低k(即介电常数范围为约1.5至约3.5)层间电介质(ILD)材料的互连图案的改进方法和结构。 具体地说,减小的光刻关键尺寸(CD)(即与目标CD相比)最初用于形成具有增加的厚度的图案化抗蚀剂层,其又允许使用包括下部氮化物掩模层的简单硬掩模层, 用于随后的图案转印的上氧化物掩模层。 接下来通过使用含氧化学物质的第一反应离子蚀刻(RIE)工艺来形成硬掩模叠层,以形成具有与目标CD基本相同的恢复的CD的硬掩模开口。 然后通过使用含氮化学物质的第二RIE方法将ILD材料图案化,以形成与目标CD的互连图案。