Patent ID: 8258626

Claim:
A copper interconnection structure comprising: an insulating layer; an interconnection body including copper; and a barrier layer surrounding the interconnection body, wherein the barrier layer comprises: a first barrier layer formed between a first portion of said interconnection body and the insulating layer, wherein the first portion of said interconnection body is part of the interconnection body that faces the insulating layer, and a second barrier layer formed on a second portion of said interconnection body, wherein the second portion of said interconnection body is part of the interconnection body not facing the insulating layer, and wherein: each of said first and said second barrier layers is formed of an oxide layer including manganese, and each of said first and said second barrier layers has a position where the atomic concentration of manganese is maximized in their thickness direction of said first and said second barrier layers, wherein the maximum atomic concentration of manganese in the second barrier layer is greater than the atomic concentration of manganese in the first barrier layer.