Patent ID: 6759324
Filing Date: 2004-07-06
Classification: H01L

Abstract:
A process for forming low resistance contacts between conducting lines in an integrated circuit, comprising:forming a first metallic layer over a semiconductor substrate, said metallic layer having a first surface, wherein said first metallic layer comprises an aluminum layer and said first surface includes an aluminum oxide; forming an insulating layer over the first surface; forming a patterned mask over said insulating layer, the patterned mask defining an opening having a width of less than about 0.75 &mgr;m; forming a contact via in said insulating layer through the opening in said patterned mask to expose a contact region of the first surface; removing said patterned mask; depositing a titanium layer over said insulating layer and into said contact via, said titanium layer having a thickness over the insulating layer between about 300 Ã¥ and 400 Ã¥; and reacting said titanium layer with said aluminum layer to form a titanium-aluminum complex, wherein the titanium-aluminum complex has a thickness between about 200 Ã¥ and 600 Ã¥.