Patent ID: 8273604

Claim:
A method of fabricating a semiconductor device, comprising: affixing a semiconductor wafer to a carrier substrate, the semiconductor wafer including first semiconductor die and a saw street disposed between the first semiconductor die; cutting through the saw street to separate the first semiconductor die until a surface of the carrier substrate is exposed; forming first vias that partially penetrate the carrier substrate; conformally depositing a seed layer on surfaces of the carrier substrate exposed by the first vias; depositing an encapsulant over the first semiconductor die and the carrier substrate to fill the first vias; forming second vias through the encapsulant to expose the seed layer and forming third vias through the encapsulant to expose first contact pads on upper surfaces of the first semiconductor die; filling the second vias and third vias with a first conductive material to form first portions of conductive pillars in contact with the seed layer and to form first conductive metal vias (CMVs) in contact with the first contact pads; forming a sacrificial layer over the encapsulant, the first CMVs, and the first portions of the conductive pillars; forming fourth vias through the sacrificial layer to expose the first portions of the conductive pillars; and filling the fourth vias with a second conductive material to form second portions of the conductive pillars in contact with the first portions of the conductive pillars.