Patent ID: 7994043

Claim:
A method comprising: forming a patterned resist layer on a substrate comprising a bond pad, the patterned resist layer comprising a resist layer opening overlying the bond pad; completely filling the resist layer opening with a first solder component layer, the first solder component layer comprising a first planar surface substantially coplanar with a principal surface of the patterned resist layer; forming a second solder component layer on the first planar surface of the first solder component layer that is substantially coplanar with the principal surface of the patterned resist layer and on the entire principal surface of the patterned resist layer; removing the patterned resist layer and any portion of the second solder component layer on the principal surface of the patterned resist layer; and reflowing the first solder component layer and the second solder component layer to form a binary metal alloy solder bump electrically connected to the bond pad.