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采用同步辐射源X射线衍射技术原位观测VLSI铝互连线的应力

Keywords: 同步辐射源X射线衍射,Al互连线,热应力,电迁徙

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Abstract:

为研究VLSI金属互连线的应力导致IC器件失效的问题,采用同步辐射源X射线衍射技术,原位测试了VLSI中Al互连线在电迁徙及加热条件下的应力变化.沉积态的Al互连线在室温下为拉应力.退火过程使拉应力逐渐减小,在300~350℃过程中由拉应力转为压应力.在电流密度为(3×105~4×106)A/cm2,275min的电徙动实验过程中,Al互连线阳极端由拉应力转变为压应力,并随后随着电流密度的增加而增加.此外,采用扫描电镜(SEM)观察了Al互连线的电迁徙失效特征及应力释放过程.

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