Patent ID: 8927334
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method of making a flip chip package, comprising: forming a chip carrier including a plurality of flip chip (FC) attaches located on a top surface of said chip carrier, a solder layer being formed on each FC attach; forming a first tensile film on a front side of an integrated circuit (IC) chip and a second tensile film on a backside of said IC chip; forming a plurality of openings in said first tensile film that expose said front side of said IC chip; forming a plurality of solder bumps on a corresponding plurality of underbumps, which are formed on said first side of said IC chip within each of said openings; removing said second tensile film from said backside of said IC chip; flipping said IC chip over said chip carrier, said front side of said IC chip facing said top surface of said chip carrier, each of said solder bumps opposing a solder layer formed on one of said FC attaches of said chip carrier; heating said IC chip, said underbumps, said solder bumps, said solder layers formed on said FC attaches, and said chip carrier to an elevated temperature, producing one of a flat IC chip and a positively warped IC chip; and forming a plurality of continuous solder columns at room temperature from said underbumps to each of said opposing FC attaches, to form said flip chip package.