Patent ID: 7893535
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A semiconductor device including an insulating film formed on a substrate, a buried metal interconnect formed in the insulating film, and a barrier metal film formed between the insulating film and the metal interconnect, wherein the barrier metal film includes a first film, a second film and a third film stacked in this order from a side in which the insulating film exists to a side in which the metal interconnect exists, the first film contains one metal selected from a group consisting of ruthenium, iridium, molybdernun, osmium, rhodium, platinum, vanadium and palladium, and oxygen, the second film contains one metal selected from a group consisting of titanium, tantalum, zirconium, niobium, hafnium, tungsten, ruthenium, iridium, molybdenum, osmium, rhodium, platinum and vanadium, and one element selected from a group consisting of nitrogen, carbon and silicon, the third film contains one metal selected from a group consisting of ruthenium, iridium, molybdenum, osmium, rhodium, platinum, vanadium and palladium, and the barrier metal film has a thickness of 15 nm or less.