Patent ID: 6274486
Filing Date: 2001-08-14
Classification: H01L

Abstract:
A method of forming an integrated circuit including a low resistivity intermetal contact through an insulating layer, comprising:forming a first conductive layer comprising aluminum over a semiconductor substrate, said first conductive layer having an upper surface;forming an insulating layer on the upper surface;etching a contact via with a selected size and shape in the insulating layer, thereby exposing a contact region of the upper surface, said first conductive layer including an aluminum oxide layer at least within the contact region of the upper surface;determining an amount of titanium to deposit over the insulating layer to form between 60 .ANG. and 300 .ANG. of titanium over the contact region of the contact via with the selected size and shape;depositing the determined amount of titanium over the insulating layer and into the contact via;reacting said titanium with the aluminum of said first conductive layer to form a composite material within said contact region; anddepositing a second conductive layer into the contact opening.