Patent ID: 7550377
Filing Date: 2009-06-23
Classification: H01L

Abstract:
1. A fabrication method of a single-damascene opening, the method comprising: providing a substrate, wherein a conductive line is already formed in the substrate; forming sequentially a barrier layer, a dielectric layer, a metal hard mask layer, a silicon oxynitride layer, a bottom antireflection layer and a patterned photoresist layer on the substrate, wherein after forming the silicon oxynitride layer and before forming the bottom antireflection layer, a surface property alteration process is performed on the silicon oxynitride layer to form an oxide layer on the silicon oxynitride layer; removing the bottom antireflection layer, the silicon oxynitride layer and the metal hard mask layer that are not covered by the patterned photoresist layer in a single process step until a part of a surface of the dielectric layer is exposed; removing the patterned photoresist layer and the bottom antireflection layer; and removing a portion of the dielectric layer and a portion of the barrier layer to form a damascene opening that exposes a surface of the conductive line using the silicon oxynitride layer and the metal hard mask layer as a mask.