Patent ID: 8728930
Filing Date: 2014-05-20
Classification: H01L

Abstract:
1. A method of forming metal silicide-comprising material, comprising: forming a substrate comprising a first stack comprising second metal over first metal over silicon and a second stack comprising second metal over silicon, the first and second metals being of different compositions; subjecting the substrate to conditions which react the second metal with the silicon in the second stack to form metal silicide-comprising material from the second stack, the first metal between the second metal and the silicon in the first stack precluding formation of a silicide comprising the second metal and silicon from the first stack; and after forming the metal silicide-comprising material, subjecting the first metal, the second metal and the metal silicide-comprising material to an etching chemistry that etches at least some remaining of the first and second metals from the substrate selectively relative to the metal silicide-comprising material.