Patent ID: 9475145
Filing Date: 2016-10-25
CPC Classification: B23K,C22C,H01L

Claim Text:
1. A device having a solder bump joint between a substrate having pads and a top die, comprising: solder bumps, the solder bumps positioned between the pads on the substrate having pads and the top die, the solder bumps forming the solder bump joint and joining together the substrate having pads and the top die, the solder bumps comprising lamellar structures and having a contact angle of less than 90°, wherein at least one of the lamellar structures comprises a Sn-rich phase greater than 90% Sn, and the solder bumps are predominantly a eutectic Sn—Bi compound, and the eutectic Sn—Bi compound is free of Ag.