Patent ID: 6770977
Filing Date: 2004-08-03
Classification: H01L

Abstract:
A semiconductor device comprising:an insulating film formed on a semiconductor substrate; a lower interconnect formed in the insulating film; a via hole formed on the lower interconnect and in the insulating film; an interconnect groove formed in an upper region of the via hole and in the insulating film; a plug composed of a conducting film buried in the via hole; an upper interconnect buried in the interconnect groove; and a barrier layer formed between the insulating film and the plug, the insulating film and the upper interconnect, and the plug and the lower interconnect, wherein the conducting film comprises copper, aluminum or silver, wherein the barrier layer is composed of a laminated film including a lower first barrier layer and an upper second barrier layer, and wherein the first barrier layer is made from a tantalum nitride film, and the second barrier layer is made from a tantalum film having a &bgr;-crystal structure, wherein a value of (a number of nitrogen atoms)/(a number of tantalum atoms) of the tantalum nitride film is 0.4 or less.