Patent ID: 6849534
Filing Date: 2005-02-01
Classification: H01L

Abstract:
1. A bond column fabrication process for forming at least one bonding column over a wafer, wherein the wafer has an active surface, a passivation layer and at least one metal pad, the passivation layer and the metal pad are on the active surface of the wafer with the passivation layer exposing the metal pad, the process at least comprising the steps of: sequentially forming a first thin film and a second thin film over the active surface of the wafer, wherein the first thin film and the second thin film form a mask layer, and wherein the mask layer has at least one opening that exposes the metal pad; forming at least one metallic material layer over the mask layer filling the opening in a high-velocity physical metal deposition process to serve as the bonding column, wherein the second film of the mask layer prevents penetration of metallic particles into the first thin film during the high-velocity physical metal deposition process; and sequentially removing the second thin film and the first thin film, wherein the second thin film is removed by performing a planarization process.