Patent ID: 6387793
Filing Date: 2002-05-14
Classification: H01L,H05K

Abstract:
A method for fabricating a solder bump structure for use on a substrate, comprising the steps of:(a) applying a discontinuous multilayer underbump metallization onto said substrate; (b) applying a thin layer of a metal selected from a group consisting of titanium, chrome, a titanium-nickel-titanium composite, a titanium-nickel-chrome composite, a titanium-platinum-titanium composite, and a titanium-nickel-oxidized silicon composite over or under said multilayer underbump metallization; (c) applying a solder bump onto said underbump metallization; (d) removing said thin layer of said metal in region spaced from said underbump metallization; and (e) heating said substrate to melt said solder bump and to wet it back from said thin layer of said metal.