Patent ID: 7816252
Filing Date: 2010-10-19
Classification: H01L

Abstract:
1. A method for forming a bump, comprising the steps of: providing a wafer having an active surface and at least one bonding pad formed on the active surface; forming a passivation layer on the active surface of the wafer and exposing the bonding pad; forming an under bump metallurgy on the bonding pad; forming a layer of film on the passivation layer to overlay the under bump metallurgy; performing an exposure process on the film, subjecting a portion of the film directly above the under bump metallurgy to a first exposure; removing the exposed portion of the film, exposing the under bump metallurgy and retaining an unexposed portion of the film; applying a layer of solder paste to the under bump metallurgy; removing the retained portion of the film from the wafer by a de-taping machine; and performing a second reflow process to have the solder paste formed into a bump.