Patent ID: 8383508
Filing Date: 2013-02-26
Classification: H01L

Abstract:
1. A fabrication method of a dual damascene opening, the method comprising: providing a substrate having a conductive region therein; forming a single dielectric layer over the substrate; forming a patterned metal hard mask layer, a patterned silicon oxynitride layer and a patterned silicon oxide layer on the single dielectric layer, wherein the patterned metal hard mask layer, the patterned silicon oxynitride layer and the patterned silicon oxide layer, each having the same pattern on the single dielectric layer to form a stacked layer; forming a first opening extending into but not penetrating through the single dielectric layer; and removing a first portion of the single dielectric layer beneath and adjacent to the first opening to form the dual damascene opening comprising a second opening that exposes a surface of the conductive region by using the stacked layer as a first mask.