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    • 4. 发明授权
    • Integrated circuits having reduced stress in metallization
    • 集成电路在金属化中具有降低的应力
    • US06208008B1
    • 2001-03-27
    • US09260702
    • 1999-03-02
    • Kenneth C. ArndtRichard A. ContiDavid M. DobuzinskyLaertis EconomikosJeffrey P. GambinoPeter D. HohChandrasekhar Narayan
    • Kenneth C. ArndtRichard A. ContiDavid M. DobuzinskyLaertis EconomikosJeffrey P. GambinoPeter D. HohChandrasekhar Narayan
    • H01L2941
    • H01L21/76804H01L21/32136H01L21/76835H01L21/76885
    • The stresses commonly induced in the dielectrics of integrated circuits manufactured using metal patterning methods, such as reactive ion etching (RIE) and damascene techniques, can be reduced by rounding the lower corners associated with the features which are formed as part of the integrated circuit (e.g., the interconnects) before applying the outer (i.e., passivation) layer. In connection with the formation of metal lines patterned by a metal RIE process, such corner rounding can be achieved using a two-step metal etching process including a first step which produces a vertical sidewall and a second step which tapers lower portions of the vertical sidewall or which produces a tapered spacer along the lower portions of the vertical sidewall. This results in a rounded bottom corner which improves the step coverage of the overlying dielectric, in turn eliminating the potential for cracks. For metal lines patterned by damascene, such corner rounding can be achieved using a two-step trench etching process including a first step which produces a vertical sidewall, and a second step which produces a tapered sidewall along lower portions of the vertical sidewall.
    • 通过使与金属图案化方法(例如反应离子蚀刻(RIE)和镶嵌技术)一起制造的集成电路的电介质中通常引起的应力可以通过将与形成为集成电路的一部分的特征相关联的下角 在施加外部(即钝化)层之前,例如,互连)。 关于通过金属RIE工艺形成的金属线的形成,可以使用包括产生垂直侧壁的第一步骤和使垂直侧壁的下部逐渐变细的第二步骤的两步金属蚀刻工艺来实现这种角圆化 或者沿着垂直侧壁的下部产生锥形间隔物。 这导致圆角的底角,其改善了上覆电介质的台阶覆盖,从而消除了裂纹的可能性。 对于由大马士革图案化的金属线,可以使用包括产生垂直侧壁的第一步骤的两步沟槽蚀刻工艺,以及沿着垂直侧壁的下部产生锥形侧壁的第二步骤来实现这种角落圆化。