Patent ID: 9331049
Filing Date: 2016-05-03
CPC Classification: H01L,Y10T

Claim Text:
1. A bonding structure of a bonding wire for wedge-bonding the bonding wire onto a ball bump formed on an electrode of a semiconductor device by bonding a ball part formed at an end of the bonding wire, the bonding wire including a core material containing copper as a major component thereof and an outer skin layer which contains a metal R other than copper as a major component thereof and covers the core material, the bonding structure comprising: a concentrated layer A provided in an initial boundary region at a bonding part between the ball bump and the bonding wire, wherein the concentration of the metal R in the concentrated layer A is not less than ten times the average concentration of the metal R in the ball bump; and a concentrated layer B provided in an initial boundary region at a bonding part between the ball bump and the electrode, wherein the concentration of the metal R in the concentrated layer B is not less than ten times the average concentration of the metal R in the ball bump, wherein the metal R is palladium, or includes two metals consisting of either palladium and silver or palladium and gold, in the concentrated layer A, there is a range in which the concentration of the metal R is 10mol% or more in a thickness range from 0.01to 5um, and in the concentrated layer B, there is a range in which the concentration of the metal R is 3mol% or more in a thickness range from 0.01to 5um.