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    • 10. 发明授权
    • Self-aligning silicon oxynitride stack for improved isolation structure
    • 自对准硅氮氧化物叠层,用于改善隔离结构
    • US06265283B1
    • 2001-07-24
    • US09373217
    • 1999-08-12
    • Homi E. NarimanSey-Ping SunH. Jim Fulford
    • Homi E. NarimanSey-Ping SunH. Jim Fulford
    • H01L2176
    • H01L21/76224
    • Methods of fabricating an isolation structure on a substrate are provided. In one aspect, a method of fabricating an isolation structure on a substrate is provided that includes forming a first insulating layer on the substrate wherein the first insulating layer has a first sidewall. A trench is formed in the substrate that has a second sidewall. A second insulating layer is formed in the trench. The second insulating layer displaces the second sidewall laterally. The first insulating layer is densified by heating to liberate gas therefrom and thereby move the first sidewall into substantial vertical alignment with the second sidewall. The risk of substrate attack due to trench isolation structure pullback is reduced. Trench edges are covered by thick isolation material.
    • 提供了在基板上制造隔离结构的方法。 一方面,提供一种在衬底上制造隔离结构的方法,包括在衬底上形成第一绝缘层,其中第一绝缘层具有第一侧壁。 在具有第二侧壁的基板中形成沟槽。 在沟槽中形成第二绝缘层。 第二绝缘层横向移动第二侧壁。 通过加热使第一绝缘层致密化,从而释放出气体,从而使第一侧壁与第二侧壁大致垂直对准。 由于沟槽隔离结构回缩引起的基底侵蚀的风险降低。 沟槽边缘被厚的隔离材料覆盖。