Patent ID: 7838415
Filing Date: 2010-11-23
Classification: H01L

Abstract:
1. A method of fabricating a dual damascene structure, comprising: providing a substrate having a conductive layer and a liner layer thereon; forming a dielectric layer on the liner layer; forming a cap layer and a metal hard mask layer on the dielectric layer, wherein the metal hard mask layer is formed directly on the cap layer; forming an antireflection layer directly on the metal hard mask layer; patterning the antireflection layer, the metal hard mask layer, the cap layer and the dielectric layer consecutively to form, in the dielectric layer, a via hole that exposes a portion of the liner layer; filling a gap-filling layer in the via hole and forming the gap-filling layer on a top surface of the antireflection layer; removing a portion of the gap-filling layer in the via hole and completely removing the gap-filling layer on the top surface of the antireflection layer; forming, in the dielectric layer, a trench connected with the via hole after the step of removing a portion of the gap-filling layer in the via hole and completely removing the gap-filling layer on the top surface of the antireflection layer; removing the remaining gap-filling layer in the via hole; removing the liner layer in the via hole with the metal hard mask layer as a mask; forming a metal layer filling in the trench and the via hole; and removing the metal hard mask layer.