Patent ID: 8101468

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) providing a substrate having a first upper surface and a first lower surface opposed to the first upper surface, a first semiconductor component having a first main surface and a first back surface opposed to the first main surface, and a second semiconductor component having a second main surface and a second back surface opposed to the second main surface; (b) mounting the first and second semiconductor components over the first upper surface of the substrate via a plurality of first and second bumps such that the first and second main surfaces oppose to the first upper surface of the substrate, respectively; (c) injecting first and second under-fillings into between the first and second main surfaces and the first upper surface, respectively; and (d) after the step (c), hardening the first and second under fillings by heat; wherein a coefficient of the thermal expansion of the second semiconductor component is greater than that of the first semiconductor component; and wherein a coefficient of the thermal expansion of the second under-filling is greater than that of the first under-filling; wherein the first semiconductor component includes a first semiconductor chip having a first front surface and a first rear surface opposed to the first front surface; wherein the first semiconductor chip is comprised of silicon; wherein the plurality of first bumps are formed over the first front surface of the semiconductor chip; wherein the second semiconductor component includes a wiring substrate having a second upper surface and a second lower surface opposed to the second upper surface, and a second semiconductor chip mounted on the second upper surface of the wiring substrate; wherein the second semiconductor chip is comprised of silicon; and wherein the plurality of second bumps are formed on the second lower surface of the substrate.