Patent ID: 6063703
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A method for forming a metal interconnection structure for use in a semiconductor device, comprising:forming an insulating film having at least one connection hole over a semiconductor substrate, the connection hole having an aspect ratio of at least one;forming a first layer of an underlying metal film composed mainly of a refractory metal which has a cubic or hexagonal crystal structure on the insulating film and on a side wall of the connection hole, the first layer formed on the insulating film has a (111) preferential orientation when the refractory metal has the cubic crystal structure, or a (002) preferential orientation when the refractory metal has the hexagonal crystal structure;forming a second layer of the underlying metal film composed mainly of a refractor metal compound which has a cubic crystal structure on the first layer, the second layer formed over the insulating film has a (111) preferential orientation, a thickness of the second layer formed over the side wall of the connection hole is at least about 0.5 times of the thickness of the second layer formed over the insulating film, or the connection hole is filled up with the underlying metal film; andforming an interconnecting metal film containing predominantly a component selected from the group consisting of Al, Cu, Au and Ag on the underlying metal film, the interconnecting metal film formed over the insulating film has a (111) preferential orientation.