Patent ID: 7372156
Filing Date: 2008-05-13
Classification: H01L

Abstract:
1. An aligned dual damascene opening structure, comprising: a structure having a metal structure formed thereover; the metal structure comprised of copper; a patterned layer stack over the metal structure; the layer stack comprising, in ascending order: a patterned bottom etch stop layer comprised of a combination of SiC(O) and SiC(N); a patterned lower dielectric material layer; a patterned middle etch stop layer comprised of SiN; and a patterned middle dielectric material layer; the lower and middle dielectric layers being comprised of the same material; the patterned lower and middle dielectric material layers are each comprised of FTEOS or a low-k dielectric material; a lower via opening in the patterned bottom etch stop layer and the patterned lower dielectric material layer; and an upper trench opening in the patterned middle etch stop layer and the patterned middle dielectric material layer; the upper trench opening being in communication with the lower via opening; wherein the lower via opening and the upper trench opening comprise an aligned dual damascene opening.