Patent ID: 6174804
Filing Date: 2001-01-16
Classification: H01L

Abstract:
A dual damascene process, comprising:providing a substrate structure;forming a first metallic layer and a first insulation layer on the substrate structure in sequence;patterning the first insulation layer and the first metallic layer, so that a metallic line covered by a conformal first insulation layer is formed;removing a part of the conformal first insulation layer to form a first metal line and a second metal line of the first metallic line, the first metal line being exposed by removing the part of the conformal first insulation layer and the second metal line being covered by the remaining first insulation layer;forming a second insulation layer to cover the substrate structure, the first metal line, and the remaining first insulation layer;patterning the second insulation layer to form a trench aligned over the second metal line and to expose the remaining first insulation layer;removing the remaining first insulation layer to form a via hole under the trench to expose the second metal line;forming a second metallic layer over the insulation layer and filling the trench and the via; andplanarizing the second metallic layer until the second insulation layer is exposed.