Patent ID: 8987130
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A method of bonding substrates comprising: providing a first substrate bonded to an array of solder balls; providing a second substrate having an array of bonding pads thereupon, wherein each of said bonding pads comprises at least one unit of a reactive-material-including stack that includes a layer of a first non-magnetic material, a layer of a second non-magnetic material and a magnetic material-including layer comprising a magnetic material and one of said first non-magnetic material and said second non-magnetic material, wherein upon ignition, said first non-magnetic material and said second non-magnetic material react spontaneously to form an alloy or a composite of said first non-magnetic material and said second non-magnetic material; bringing said array of solder balls into contact with said array of bonding pads; and igniting said at least one unit of said reactive-material-including stack by heating said magnetic material through a time-dependent magnetic field, wherein said array of solder balls is bonded to said array of bonding pads through heat generated by a spontaneous reaction of said first non-magnetic material and said second non-magnetic material.