Tung & Associates
Process to make a tall solder ball by placing a eutectic solder ball on top of a high lead solder ball
 Within a method for forming a solder interconnection structure for use within a microelectronic fabrication, there is first provided a substrate having formed thereover a bond pad. There is then formed upon the bond pad a first solder interconnection layer. There is then formed over the first solder interconnection layer an annular solder non-wettable copper oxide layer which does not cover an upper dome portion of the first solder interconnection layer. There is then formed over the upper dome portion of the first solder interconnection layer and not upon the annular solder non-wettable copper oxide layer a second solder interconnection layer. 
Aptos Corporation
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additional additional additional additional additional inventional additional additional additional inventional additional inventional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional inventional additional additional inventional additional inventional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional additional inventional
Tsing-Chow Chung W
Wang Ho