Patent ID: 8836147
Filing Date: 2014-09-16
Classification: B23K,H01B,H01L,Y02P

Abstract:
1. A bonding structure of a ball-bonded portion obtained by bonding to a bonding-target portion a ball portion formed on a front end of a multilayer copper bonding wire, wherein said multilayer copper bonding wire comprises: wherein said bonding structure comprises a first concentrated portion having a high total noble metal level and being formed in a ball-root region, said ball-root region being in such a surface region of said ball-bonded portion as is located at a boundary with said multilayer copper bonding wire, wherein said high total noble metal level accounts for all of said noble metals selected, and wherein a total concentration of said at least one noble metal selected in said first concentrated portion is not lower than 0.05 mol % and not higher than 6 mol %.