Patent ID: 7038318
Filing Date: 2006-05-02
Classification: H01L

Abstract:
1. A compound structure for reduced contact resistance to a silicon-containing material, comprising: a first refractory metal material overlying and adjoining the silicon-containing material, wherein the first refractory metal material is a conductive material containing a first refractory metal and a first impurity capable of forming a chemical bond with the first refractory metal; and a second refractory metal material overlying the first refractory metal material, wherein the second refractory metal material is a conductive material containing a second refractory metal and a second impurity capable of forming a chemical bond with the second refractory metal; wherein the first refractory metal material contains the first impurity at a level less than a stoichiometric level; and wherein the second refractory metal material has a lower affinity for the first and second impurities than does the first refractory metal material.