Patent ID: 7784669

Claim:
A process of manufacture of microelectronic packaging, comprising: creating a solder composition comprising at least one nucleating modifier to induce nucleation sites therein which facilitate a reduction in the undercooling temperature of solder joints comprised of said solder composition; joining together a first substrate and a second substrate with an array of solder joints having substantially similar melting points, at least one solder joint in the array comprising said solder composition having a reduced undercooling temperature relative to one or more joints in the array; undercooling the array to freeze the at least one solder joint with the reduced undercooling temperature thereby pinning the first substrate and the second substrate together with the at least one frozen joint while other joints in the array are still melted; further undercooling the array to freeze other joints in the array; and repeating the process of further undercooling the array until the remaining joints in the array have frozen.