Patent ID: 9673184
Date: 2017-06-06
CPC Classifications: H01L

Claim:
1. A method comprising: placing a mold chase over a package substrate, wherein the mold chase comprises a recess extending from a bottom surface of the mold chase into the mold chase; pressing the package substrate against a release film placed to the bottom surface of the mold chase and extending into the recess, wherein a solder region of the package substrate is outside the recess, and an upper portion of the solder region at a top surface of the package substrate is pressed into the release film, and a lower portion of the solder region is left outside of the release film; injecting a molding material into a space between the release film and the package substrate, wherein the lower portion of the solder region is in the molding material, and the molding material contacts a top surface of a metal feature underlying the solder region, and the top surface of the metal feature is further in contact with the solder region; curing the molding material; and removing the mold chase.