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    • 29. 发明授权
    • Process of making unlanded vias
    • 制作无人化过孔的过程
    • US5976984A
    • 1999-11-02
    • US1416
    • 1997-12-30
    • Coming ChenChih-Chien LiuKun-Chih WangTri-Rung Yew
    • Coming ChenChih-Chien LiuKun-Chih WangTri-Rung Yew
    • H01L21/768H01L23/522H01L21/02
    • H01L23/5226H01L21/76802H01L21/76829H01L2924/0002
    • A method of making vias in a semiconductor IC device having adequate contact to the surface of the interconnects and without inadequate landing is disclosed. The method has interconnects formed in a metal layer on the substrate of the IC device, and a first dielectric layer is formed covering the surface of the interconnects. An etch-stopping layer is then formed on top of the first dielectric layer, followed by the formation of a second dielectric layer on top of the etch-stopping layer. A photoresist layer then covers the second dielectric layer and reveals the surface regions of the second dielectric layer designated for the formation of the vias. A main etching procedure is then performed to etch into the second dielectric layer down to the surface of the etch-stopping layer, thereby forming the first section of the vias. An over-etching procedure is then implemented to strip off the etch-stopping layer and further etches into the first dielectric layer and the etching is then stopped when the surface of the interconnects are revealed to conclude the formation of the vias.
    • 公开了一种在半导体IC器件中形成通孔的方法,该半导体IC器件具有与互连表面的充分接触并且没有不足够的着陆。 该方法具有形成在IC器件的衬底上的金属层中的互连,并且覆盖互连表面的第一介电层被形成。 然后在第一介电层的顶部上形成蚀刻停止层,随后在蚀刻停止层的顶部形成第二电介质层。 光致抗蚀剂层然后覆盖第二电介质层并且显露指定用于形成通孔的第二电介质层的表面区域。 然后执行主蚀刻程序以蚀刻到第二介电层中,直到蚀刻停止层的表面,从而形成通孔的第一部分。 然后实施过蚀刻程序以剥离蚀刻停止层并进一步蚀刻到第一介电层中,然后当显露互连表面以终止形成通孔时,停止蚀刻。