Patent ID: 7423345

Claim:
A semiconductor construction, comprising: a semiconductor substrate having an upper surface comprising one or more of silicon, silicon nitride and borophosphosilicate glass; a first metal-containing layer over and in direct physical contact with the upper surface of the semiconductor substrate, the first metal-containing layer comprising one or both of tantalum and tungsten; and a second metal-containing layer over and in direct physical contact with the first metal-containing layer; the second metal-containing layer consisting essentially of a first metal and a second metal; the first metal being selected from the group consisting of copper, cobalt, nickel and mixtures thereof; and the second metal being selected from the group consisting of palladium, iridium, rhodium, ruthenium and mixtures thereof; the second metal-containing layer comprising at least 95 atom percent of the first metal and comprising from greater than 0 atom percent to less than 5 atom percent of the second metal.