| Title |
Characteristics of the Sn-Pb Eutectic Solder Bump Formed via Fluxless Laser Reflow Soldering |
| Authors |
이종현(Jong Hyun Lee),박대진(Dae Jin Park),이용호(Yong Ho Lee),신동혁(Dong Hyuk Shin),김용석(Yong Suk Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
In an attempt to develop a fluxless reflow solder bumping process, the effects of processing variables, which include energy input rate and time, and the shape of solder disk on the microstructure of the solder/Cu pad interface and the shear strength of the joints were investigated. It was demonstrated that a proper combination of the variables could lead to the formation of a spherical solder bump with shear strength comparable to that formed via the conventional reflow soldering process. In addition, the kinetics of Cu pad dissolution into the solder during laser heating was modeled numerically to elucidate intermetallic formation mechanism at the solder/Cu pad interface. |