Patent ID: 7341949
Filing Date: 2008-03-11
Classification: H01L

Abstract:
1. A process for forming a conductive bump on an electronic component, the process comprising the steps of: providing the electronic component with a passivation layer and at least one bond pad formed on a surface of the electronic component, the bond pad being exposed from the passivation layer; forming an under bump metallurgy (UBM) structure on the passivation layer and the bond pad; applying a photoresist on the UBM structure, the photoresist having at least one opening corresponding to the bond pad; depositing a thick copper layer in the opening of the photoresist; after removing the photoresist and a part of the UBM structure free of covering the bond pad, applying on the passivation layer another photoresist which has at least one opening for receiving the copper layer therein; applying a solder material on the copper layer and in the opening of the photoresist; and performing a reflowing procedure for mixing the copper layer and the solder material to form the conductive bump, wherein copper ions diffuse from the copper layer into the solder material.