Patent ID: 9123537
Filing Date: 2015-09-01
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, said method comprising: forming a hard mask film comprising at least three layers over a low dielectric constant film having a dielectric constant less than a dielectric constant of a silicon oxide; forming a trench pattern in a first mask film comprising an uppermost layer of the hard mask film, and forming a via pattern located on an inside of the trench pattern, when seen in a plan view, in a second mask film comprising the hard mask film located below the first mask film, by repeating an etching of the hard mask film using a photoresist as a mask, and an ashing process of removing the photoresist; etching a third mask film comprising a lowermost layer of the hard mask film and the low dielectric constant film, using the second mask film as a mask, and forming a recess which passes through the third mask film and leads to the low dielectric constant film; etching a portion of the third mask film located below the trench pattern and etching the low dielectric constant film, to form a via hole overlapping the recess and a trench, located over the via hole, which overlaps the trench pattern, in the low dielectric constant film; and burying a conductive film within the via hole and the trench, wherein in said forming the hard mask film having at least three layers, a layer including an insulating material and a layer including a metal material, an amorphous silicon or a polycrystalline silicon, are alternately laminated.