Patent ID: 8394713
Filing Date: 2013-03-12
Classification: H01L

Abstract:
1. A method for forming over pad metallization (OPM) on a semiconductor die having a bond pad in which the bond pad has an inner portion surrounded by a passivation layer, comprising: depositing a nickel layer on the bond pad, wherein a lack of adhesion between the nickel layer and the passivation layer results in a space between the nickel layer and the passivation layer down to the bond pad; applying an isotropic etchant selective for nickel to the nickel layer to widen the space between the nickel layer and the passivation layer down to the bond pad; and depositing a palladium layer on the nickel layer and in the space so as to be in contact, in the space, with the bond pad, the passivation layer, and the nickel layer.