Patent ID: 7037829
Filing Date: 2006-05-02
Classification: H01L

Abstract:
1. A method of reducing contact resistance to a silicon-containing material, comprising: forming a first refractory metal material on the silicon-containing material, wherein the first refractory metal material is a conductive material containing a first refractory metal and a first impurity forming a chemical bond with the first refractory metal, and wherein the first refractory metal material contains the first impurity at a level less than a stoichiometric level; forming a second refractory metal material on the first refractory metal material, wherein the second refractory metal material is a conductive material containing a second refractory metal and a second impurity forming a chemical bond with the second refractory metal, and wherein the second refractory metal material has a lower affinity for the first and second impurities than does the first refractory metal material; and annealing to form a refractory metal silicide interface between the first refractory metal material and the silicon-containing material.