Patent ID: 7242097
Filing Date: 2007-07-10
Classification: H01L,H05K,Y02P

Abstract:
1. An apparatus comprising: a microelectronic device having a surface; a bump containing copper coupled with the surface of the microelectronic device; a substrate having a surface; a pad including a stack including copper coupled with the surface of the substrate; a solder joint containing tin disposed between the bump and the pad; and a first barrier material including a material that is selected from the group consisting of cobalt, iron, titanium, and combinations thereof, which is disposed between the solder joint and the bump, wherein the first barrier material directly contacts the solder joint; a second barrier material including a material that is selected from the group consisting of cobalt, iron, titanium, and combinations thereof, which is disposed between the solder joint and the stack of the pad, wherein the second barrier material contacts the solder joint; wherein the first and the second barrier materials each include a thickness that is in a range between 0.01 to 20 μm.