Bump Resistance Change Behavior due to Cu-Sn IMCs Formation with Various Solder Diameters

Abstract

Theoretical calculation and simulation of FEM were proposed to explain the decline of change in resistance in Cu-Sn microbumps during the electromigration test. The IMC transformation from Cu6Sn5 to Cu3Sn was supposed to be the reason. Being aware that the dimension keeps shrinking, the behavior for various solder diameters was also investigated.