Patent ID: 8133762

Claim:
A method of making a semiconductor device, comprising: providing a sacrificial substrate; depositing an interface layer over the sacrificial substrate; forming a first conductive layer over the interface layer; forming a first polymer pillar over the first conductive layer; forming a second conductive layer over the first polymer pillar to create a first conductive pillar with inner polymer core; mounting a semiconductor die or component over the sacrificial substrate; depositing an encapsulant over the semiconductor die or component and around the first conductive pillar; forming a first interconnect structure over a first side of the encapsulant, the first interconnect structure being electrically connected to the first conductive pillar; removing the sacrificial substrate and interface layer; and forming a second interconnect structure over a second side of the encapsulant opposite the first interconnect structure, the second interconnect structure being electrically connected to the first conductive pillar.