Patent ID: 9064820
Filing Date: 2015-06-23
Classification: H01L

Abstract:
1. A method of forming an assembly of a substrate and a flip-chip having solder balls thereon, the method comprising steps of: placing the flip chip with the solder balls in contact with the substrate to form a first interim assembly at a first predetermined temperature, wherein the first predetermined temperature is lower than a melting temperature of the solder balls; providing an encapsulant material to the first interim assembly and exposing the provided encapsulant material to a second predetermined temperature at which the encapsulant material flows to surround the solder balls and fill gaps between the solder balls without undergoing curing to thereby form a second interim assembly, wherein the second temperature is lower than a melting temperature of the solder balls and at least as high as the first predetermined temperature, and wherein the solder balls have not been melted prior to the provision of the encapsulant material to the first interim assembly; and subjecting the second interim assembly to an environment of a third predetermined temperature that is sufficient to melt the solder balls, wherein the third predetermined temperature is greater than the second predetermined temperature.