Patent ID: 6204167
Filing Date: 2001-03-20
Classification: H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:forming a first wiring on a substrate having a first insulating layer on a surface thereof, said first wiring containing 90% or more refractory;forming a second insulating layer on said first wiring;forming a via hole in said second insulating layer so as to expose a surface of said first wiring;forming a barrier layer at least on the exposed surface of said first wiring at a bottom of said via hole, forming said barrier layer including heating surfaces of said second insulating layer and said first wiring, starting deposition of a TiN layer when a temperature of said surfaces is 50 to 200.degree. C., and continuing deposition of said TiN layer at least on the surface of said first wiring exposed at a bottom of said via hole, while controlling a temperature of a surface of said TiN layer so as to set the temperature to 400 to 600.degree. C. at termination of said deposition of said TiN layer, said barrier layer being made of a material different from, and not substantially reacting with, both Al and, the refractory metal;slightly oxidizing a surface of said barrier layer to form an oxidized surface layer;degassing by heating at least said barrier layer to a temperature of 250 to 500.degree. C. for degassing gas molecules absorbed on a surface of said barrier layer; andforming a second wiring layer on said insulating layer and said oxidized surface layer, said second wiring layer containing 90% or more Al.