Patent ID: 8003536
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method of forming a metal interconnect structure comprising: forming an elemental metal liner layer directly on a top surface of a dielectric material layer; forming a metal nitride liner layer directly on a top surface of said elemental metal liner layer; forming a titanium (Ti) liner layer directly on a top surface of said metal nitride liner layer; forming an aluminum (Al) layer directly on a top surface of said Ti liner layer; forming a metal nitride cap layer directly on a top surface of said aluminum portion; patterning said aluminum layer to form an aluminum portion and patterning said Ti liner layer to form a Ti liner portion; and annealing said Ti liner portion and said aluminum portion, wherein said Ti liner portion reacts with a sub-portion of said aluminum layer portion to form a TiAl