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Low temperature bonding of Sn/In-Cu interconnects for three-dimensional integration applications

A low temperature bonding technology of Sn/In composite solder bonded to Cu interconnect is proposed and investigated. The intermetallic compounds formed in the bonded interconnects can survive well in the following process. The Sn/In-Cu interconnects bonded at low temperature all exhibit excellent electrical performance and high resistance to multiple current stressing, showing a great potential in 3D applications.