Patent ID: 6413859
Filing Date: 2002-07-02
Classification: H01L

Abstract:
A method of fabricating a substantially non-agglomerated metal alloy silicide contact comprising the steps of:(a) forming a metal alloy layer over a portion of a silicon-containing substrate, wherein said metal alloy layer comprises Co or Ti and an alloying additive, said silicon-containing layer not containing activated source/drain regions embedded therein and said alloying additive is C, Al, Si, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Sn, La, Hf, W, Re, Ir, Ce, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb, Lu or mixtures thereof; (b) annealing said metal alloy layer at a temperature which is effective in converting a portion of said metal alloy layer into a metal alloy silicide layer, said metal alloy silicide layer being difficult to etch compared to said metal alloy layer and being substantially resistant to agglomerization during a subsequent high temperature annealing step; and (c) removing any remaining metal alloy layer not converted in step (b).