Patent ID: 8169079

Claim:
A copper interconnection structure comprising: an insulating layer; an interconnection body including copper in an opening provided on the insulating layer; and a barrier layer, comprising a metal element and copper, formed between the insulating layer and the interconnection body, and wherein: an atomic concentration of the metal element in the barrier layer is accumulated toward an outer surface of the barrier layer facing the insulating layer, and an atomic concentration of copper in the barrier layer is accumulated toward an inner surface of the barrier layer facing the interconnection body, and the inner surface of the barrier layer comprises copper surface orientation of {111} and {200}, and an intensity of X-ray diffraction peak from the inner surface of the barrier layer is stronger for the {111} peak than for the {200} peak; wherein the barrier layer comprises a first barrier layer and a second barrier layer, wherein the first barrier layer has a multilayer structure which comprises: a first layer comprising tantalum nitride formed on the insulating layer, and a second layer comprising tantalum formed over the first layer.