Patent ID: 7838391

Claim:
A method of forming a semiconductor device, comprising: providing a wafer having a plurality of bumps formed on a surface of the wafer; forming an under-film layer over the bumps formed on the surface of the wafer to completely cover all portions of the bumps with the under-film layer; forming an adhesive layer over the under-film layer after forming the under-film layer over the bumps on the surface of the wafer; attaching a support layer containing glass or acryl board over the adhesive layer after forming the adhesive layer over the under-film layer; grinding a back surface of the wafer, wherein the support layer provides structural support to the wafer during the grinding process; laminating a dicing saw tape to the back surface of the wafer following the grinding process; removing the support layer to expose the adhesive layer which remains disposed over the under-film layer; removing the adhesive layer after removing the support layer to expose the under-film layer while all portions of the bumps remain completely covered by the under-film layer after removing the adhesive layer; singulating the wafer into a plurality of semiconductor die; and mounting the semiconductor die to a substrate by applying force to a back surface of the semiconductor die to press the bumps through under-film layer to contact the substrate while the under-film layer provides an underfill between the semiconductor die and substrate.