Patent ID: 6189209
Filing Date: 2001-02-20
Classification: H01L,Y10S,Y10T

Abstract:
A method of forming an electrical interconnect through a via to electrically couple two electrically conductive layers which comprises the steps of:(a) providing a pair of electrically conductive layers;(b) providing an electrically insulating layer between said pair of electrically conductive layers having a via having walls, said walls extending between said pair of electrically conductive layers;(c) forming a layer of titanium covering the walls of said via and extending onto one of said pair of electrically conductive layers;(d) forming a layer of a material taken from the group consisting of titanium nitride, tantalum nitride and titanium tungsten substantially completely covering said titanium on said walls but not completely covering said titanium on said one of said pair of electrically conductive layers;(e) filling the remainder of said via with aluminum such that said aluminum contacts said titanium on said one of said pair of electrically conductive layers to form an interface with said titanium; and(f) forming an alloy of said aluminum with said titanium on said one of said pair of electrically conductive layers at said interface.