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    • 3. 发明授权
    • Pillar via process
    • 支柱通过过程
    • US4614021A
    • 1986-09-30
    • US717343
    • 1985-03-29
    • Terry S. Hulseweh
    • Terry S. Hulseweh
    • H01L21/3205H01L21/768H01L21/312
    • H01L21/76885H01L21/76819
    • An improved means and method is described for providing a conductive pillar in a via between multiple layers of conductors on planar electronic structures such as integrated circuits. A lower first conductor layer is formed on the device substrate and covered with an electrically conducting etch-stop layer and a second conductor layer. The second conductor layer is masked to define the conductive via and etched selectively and anisotropically until the etch-stop layer is reached. The exposed portions of the etch-stop layer are then removed. The remaining portions of the etch-stop layer and second conductor layer together form the conductive pillar. The lower first metal layer is patterned and then covered with a planarizing layer, such as a polyimide, having a thickness at least equal to the height of the pillar. The planarizing layer is uniformly etched to expose the top of the pillar and then an upper metal layer deposited over the remaining polyimide and in contact with the top of the pillar. The remaining polyimide acts as the interlayer dielectric.
    • 描述了一种改进的装置和方法,用于在诸如集成电路的平面电子结构上的多层导体之间的通孔中提供导电柱。 下部第一导体层形成在器件衬底上并覆盖有导电蚀刻停止层和第二导体层。 第二导体层被掩蔽以限定导电通孔并且被选择性地和各向异性地蚀刻,直到达到蚀刻停止层。 然后去除蚀刻停止层的暴露部分。 蚀刻停止层和第二导体层的其余部分一起形成导电柱。 下部第一金属层被图案化,然后被平坦化层(例如聚酰亚胺)覆盖,其厚度至少等于柱的高度。 均匀蚀刻平坦化层以暴露柱的顶部,然后沉积在剩余聚酰亚胺上并与柱的顶部接触的上金属层。 剩余的聚酰亚胺作为层间电介质。