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Provided is a semiconductor package stack structure. The semiconductor package stack structure includes a lower semiconductor package, an interposer substrate disposed on the lower semiconductor package and having a horizontal width greater than a horizontal width of the lower semiconductor package,

Provided is a semiconductor package stack structure. The semiconductor package stack structure includes a lower semiconductor package, an interposer substrate disposed on the lower semiconductor package and having a horizontal width greater than a horizontal width of the lower semiconductor package, an upper semiconductor package disposed on the interposer substrate, and underfill portions filling a space between the lower semiconductor package and the interposer substrate and surround side surfaces of the lower semiconductor package.

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1. A semiconductor package stack structure, comprising: a lower semiconductor package;an interposer substrate disposed on the lower semiconductor package, the interposer substrate having a horizontal width greater than a horizontal width of the lower semiconductor package;an upper semiconductor pack

1. A semiconductor package stack structure, comprising: a lower semiconductor package;an interposer substrate disposed on the lower semiconductor package, the interposer substrate having a horizontal width greater than a horizontal width of the lower semiconductor package;an upper semiconductor package disposed on the interposer substrate; andan underfill portion filling a space between the lower semiconductor package and the interposer substrate, and surround side surfaces of the lower semiconductor package. 2. The semiconductor package stack structure of claim 1, wherein side surfaces of the underfill portion include a first side surface vertically aligned with side surfaces of the interposer substrate, and a second side surface extending from the first side surface and having a slope, respectively. 3. The semiconductor package stack structure of claim 2, wherein the second side surface has a concave shape. 4. The semiconductor package stack structure of claim 2, wherein the second side surface has a linear shape. 5. The semiconductor package stack structure of claim 1, wherein the underfill portion comprises: side surfaces vertically aligned with side surfaces of the interposer substrate; anda lower surface coplanar with a lower surface of a lower package substrate of the lower semiconductor package. 6. The semiconductor package stack structure of claim 1, wherein the interposer substrate comprises: a lower insulating layer;an upper insulating layer disposed on the lower insulating layer; andthermal vias passing through the lower insulating layer and the upper insulating layer. 7. The semiconductor package stack structure of claim 6, further comprising: a heat transfer layer formed between the lower semiconductor package and the thermal vias of the interposer substrate. 8. The semiconductor package stack structure of claim 6, wherein the interposer substrate further includes a core layer disposed between the lower insulating layer and the upper insulating layer, and the thermal vias pass through the core layer. 9. The semiconductor package stack structure of claim 1, further comprising: lower connection bumps connecting the lower semiconductor package to the interposer substrate. 10. The semiconductor package stack structure of claim 1, wherein the lower semiconductor package comprises: a lower semiconductor chip mounted on an upper surface of a lower package substrate;a lower molding member formed on the upper surface of the lower package substrate, and surrounding side surfaces of the lower semiconductor chip;chip bumps formed between the lower package substrate and the lower semiconductor chip; andexternal connection terminals formed on a lower surface of the lower package substrate. 11. The semiconductor package stack structure of claim 10, wherein the lower semiconductor chip further includes through silicon vias (TSVs) vertically passing through a body. 12. A semiconductor package stack structure, comprising: a lower semiconductor package having a lower package substrate, a lower semiconductor chip mounted on the lower package substrate, and a lower molding member surrounding side surfaces of the lower semiconductor chip on the lower package substrate;an upper semiconductor package having an upper package substrate, an upper semiconductor chip mounted on the upper package substrate, and an upper molding member covering side surfaces and upper surfaces of the upper semiconductor chip on the upper package substrate;an interposer substrate disposed between the lower semiconductor package and the upper semiconductor package, and having a horizontal width greater than a horizontal width of the lower semiconductor package; andan underfill portion filling a space between the lower semiconductor package and the interposer substrate and surrounding side surfaces of the lower semiconductor package. 13. The semiconductor package stack structure of claim 12, further comprising: lower connection bumps disposed in the lower molding member, and physically and/or electrically connecting the lower semiconductor package to the interposer substrate. 14. The semiconductor package stack structure of claim 13, wherein a vertical length of each of the lower connection bumps is greater than a vertical length of the lower molding member, and an upper end of each of the lower connection bumps is protruded from an upper surface of the lower molding member. 15. The semiconductor package stack structure of claim 14, wherein the underfill portion surrounds protruded side surfaces of the upper end of each of the lower connection bumps. 16. A semiconductor package stack structure, comprising: a lower semiconductor package;an upper semiconductor package disposed on the lower semiconductor package;an interposer substrate disposed between the lower semiconductor package and the upper semiconductor package; andan underfill portion filling a space between the interposer substrate and the lower semiconductor package, the underfill portion surrounding side surfaces of the lower semiconductor package,wherein an area of the interposer substrate is greater than an area of the lower semiconductor package in a top view. 17. The semiconductor package stack structure according to claim 16, wherein side surfaces of the underfill portion include a portion vertically aligned with side surfaces of the interposer substrate and a sloped portion, respectively. 18. The semiconductor package stack structure of claim 16, wherein the area of the interposer substrate is the same as an area of the upper semiconductor package in a top view. 19. The semiconductor package stack structure of claim 16, further comprising: lower connection bumps connecting the lower semiconductor package to the interposer substrate; andupper connection bumps connecting the upper semiconductor package to the interposer substrate. 20. The semiconductor package stack structure of claim 19, wherein upper surface of each of the lower connection bumps is at a higher level than an upper surface of the lower semiconductor package.