In one example, a semiconductor device comprises a base assembly comprising a first substrate, a first device on a top surface of the first substrate, and a first encapsulant on the top surface of the first substrate and bounding a side surface of the first device. The semiconductor device further comprises a conductive pillar on the first substrate and in the first molding compound, wherein the conductive pillar comprises a non-conductive pillar core and a conductive pillar shell on the pillar core.