Patent ID: 9530856
Filing Date: 2016-12-27
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a substrate; a first insulating film over the substrate, the first insulating film comprising a first opening; a second insulating film covering part of the first insulating film, the second insulating film comprising a second opening including the first opening; a first conductive film in the first opening, the first conductive film comprising a Cu—X alloy, where X is Mn, Ni, Cr, Fe, Co, Mo, Ta, Ti, Zr, Mg, Ca, or a mixture of two or more of these elements; and a second conductive film over the first conductive film and in the first opening, the second conductive film comprising Cu, wherein the first insulating film is interposed between the second insulating film and a side surface of the first conductive film, wherein the first conductive film is interposed between the second conductive film and a side surface of the first insulating film, and wherein each of the first insulating film, the second insulating film, the first conductive film, and the second conductive film comprises a horizontal top surface, all of the horizontal top surfaces being on a same level.