Patent ID: 9190317
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A method for fabricating an interconnection structure, comprising: providing a substrate having certain semiconductor devices, a metal layer electrically connecting with the semiconductor devices, and a barrier layer on the metal layer; forming a dielectric layer on the substrate; forming a black diamond hard mask on the dielectric layer; forming an antireflective coating made of silicon oxynitride (SiON) on the black diamond hard mask that is on the dielectric layer; forming a second mask having a first pattern corresponding to a through hole, wherein the antireflective coating significantly reduces lithographic light reflection to avoid photoresist residue in the first pattern; forming a through hole by etching the dielectric layer and the antireflective coating covering the dielectric layer using the second mask as an etching mask; and forming a via by filling the through hole with a conductive material.