Patent ID: 9379007
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A method of forming an interconnect structure comprising: providing a semiconductor substrate having a metal layer; forming a copper pedestal having a first end coupled to the metal layer, at least one side, and a second end; forming an electromigration barrier layer on the copper pedestal, wherein the electromigration barrier layer is on the second end of the copper pedestal but not on the at least one side of the copper pedestal; forming a barrier protection layer located directly on the electromigration barrier layer; forming a solder layer on the barrier protection layer, wherein the formed barrier protection layer preserves the electromigration barrier layer by preventing the formation of intermetallic compounds comprising material from the underlying electromigration barrier layer during reflow of the formed solder layer; and pressing a mold over the solder layer so that the solder layer directly contacts the barrier protection layer, wherein the method is performed so that a formed interconnect structure for receiving a structure having a second semiconductor substrate to define a microelectronic package is characterized by the solder layer contacting the at least one side of the copper pedestal.