Embedded component package and fabrication method
View Patent ↗An array includes a substrate having a frontside surface and a backside surface. A backside cavity is formed in the backside surface. Backside through vias extend through the substrate from the frontside surface to the backside surface. Embedded component through vias extend through the substrate from the frontside surface to the backside cavity. An embedded component is mounted within the backside cavity and coupled to the embedded component through vias. In this manner, the embedded component is embedded within the substrate. By embedding the embedded component within the substrate, the overall thickness of the array is minimized. Further, by electrically connecting the embedded component to the embedded component through vias, which are relatively short, the impedance between active surface ends of the embedded component through vias and the bond pads of the embedded component is minimized thus providing superior power management. Further, routing space on the frontside surface and/or the backside surface is preserved.
1. An electronic device structure comprising:
a substrate comprising:
an integrated circuit (IC) chip;
an active frontside surface;
an inactive backside surface, wherein the IC chip comprises a bond pad on the frontside surface;
a backside cavity in the backside surface, the backside cavity comprising a backside cavity base and backside cavity sidewalls; and
an embedded component through via extending through the substrate from the frontside surface to the backside cavity;
a backside through via extending through the substrate from the frontside surface to the backside surface;
a backside through via nub, where the backside through via nub comprises an end portion of a first continuous metal column filling the backside through via;
a first passivation lining isolating the first continuous metal column from the IC chip, wherein the first passivation lining does not extend from the IC chip;
an embedded component through via nub protruding from the backside cavity base, where the embedded component through via nub comprises an end portion of a second continuous metal column filling the embedded component through via; and
a second passivation lining isolating the second continuous metal column from the IC chip, wherein the second passivation lining does not extend from the backside cavity base;
an encapsulant that fills at least a portion of the backside cavity, wherein the encapsulant does not extend laterally beyond the cavity sidewalls;
a backside passivation layer that covers the backside surface of the substrate but not at least a portion of the backside cavity sidewalls, wherein the backside through via nub protrudes from the backside passivation layer.
2. The structure of claim 1 , wherein the encapsulant fills the entire backside cavity and extends from the backside cavity.
3. The structure of claim 1 , wherein the backside passivation layer is separated from the encapsulant.
4. The structure of claim 3 , wherein the encapsulant directly contacts the backside cavity sidewalls around an entire periphery of the backside cavity.
5. The structure of claim 1 , comprising an interconnection metal on a backside surface of the embedded component through via nub, wherein a lateral side of the embedded component through via nub that extends completely around the embedded component through via nub is not covered by the interconnection metal.
6. The structure of claim 1 , comprising:
an embedded electronic component in the backside cavity, the embedded electronic component comprising: a first component surface facing the backside cavity base, a second component surface opposite the first component surface, and a plurality of side component surfaces connecting the first component surface and the second component surface,
wherein the encapsulant completely fills the backside cavity, and at least a portion of one of the plurality of side component surfaces is exposed from the encapsulant.
7. The structure of claim 1 , wherein the encapsulant overfills the backside cavity and comprises a convex curved backside surface.