Patent ID: 8580688
Filing Date: 2013-11-12
Classification: H01L

Abstract:
1. A method for forming a copper interconnection structure, the method comprising the steps of: forming an insulating layer over a main body; forming a copper layer including manganese on the insulating layer; annealing the copper layer including manganese so as to form a diffusion barrier layer, wherein the annealing step is applied: depositing copper over the diffusion barrier layer so as to form an interconnection body, wherein the diffusion barrier layer comprises an oxide layer including manganese having a compositional ratio of oxygen to manganese (y/x) less than 2; further comprising a step of annealing an upper surface of the interconnection body after the depositing step so as to form a second oxide layer on the upper surface of the interconnection body; wherein a compositional ratio of oxygen to manganese in the second oxide layer (y