Stacked semiconductor device including a cooling structure
View Patent ↗A stacked semiconductor device includes a cooling structure to increase the cooling efficiency of the stacked semiconductor device. The cooling structure includes various types of cooling components integrated into the stacked semiconductor device that are configured to remove and/or dissipate heat from dies of the stacked semiconductor device. In this way, the cooling structure reduces device failures and permits the stacked semiconductor device to operate at greater voltages, greater speeds, and/or other increased performance parameters by removing and/or dissipating heat from the stacked semiconductor device.
1. A method, comprising:
forming a first die;
forming a second die;
forming a first bonding layer on a carrier substrate;
forming a plurality of first horizontal heat removal structures in the first bonding layer;
bonding, after forming the plurality of first horizontal heat removal structures in the first bonding layer, the first die to the carrier substrate using the first bonding layer;
forming a second bonding layer over the first die;
forming a plurality of second horizontal heat removal structures in the second bonding layer;
bonding, after forming the plurality of second horizontal heat removal structures in the second bonding layer, the first die and the second die using the second bonding layer to form a stacked semiconductor device; and
forming, after bonding the first die and the second die using the second bonding layer, a portion of a cooling structure to dissipate heat that is generated by the first die and the second die, wherein forming the portion of the cooling structure comprises:
forming a dielectric layer around side surfaces of the second die;
forming a plurality of vertical heat dissipation structures in the dielectric layer around the side surfaces of the second die; and
forming an inter-die cooling structure through the first die and through the second die,
wherein the inter-die cooling structure connects to a horizontal heat removal structure of the plurality of first horizontal heat removal structures.
2. The method of claim 1 , wherein forming the inter-die cooling structure through the first die and through the second die comprises:
etching through the first die and through the second die after bonding the first die and the second die; and
forming the inter-die cooling structure through the first die and through the second die after etching through the first die and through the second die.
3. The method of claim 1 , wherein forming the dielectric layer around the side surfaces of the second die comprises:
forming a first portion of the dielectric layer around the side surfaces of the second die;
wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein the method further comprises:
forming a second portion of the dielectric layer around side surfaces of the first die; and
forming a second plurality of vertical heat dissipation structures in the second portion of the dielectric layer to connect to the plurality of second horizontal heat removal structures.
4. The method of claim 1 , wherein forming the dielectric layer around the side surfaces of the second die comprises:
forming a first portion of the dielectric layer around the side surfaces of the second die;
wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein the method further comprises:
forming a second portion of the dielectric layer around side surfaces of the first die; and
forming a second plurality of vertical heat dissipation structures in the second portion of the dielectric layer.
5. The method of claim 1 , wherein forming the portion of the cooling structure further comprises:
forming another plurality of vertical heat dissipation structures above the second die.
6. The method of claim 1 , wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein forming the portion of the cooling structure further comprises:
forming a third horizontal heat removal structure above the second die and connected to the first plurality of vertical heat dissipation structures; and
forming a second plurality of vertical heat dissipation structures in the dielectric layer and around the first plurality of vertical heat dissipation structures.
7. The method of claim 1 , wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein forming the portion of the cooling structure further comprises:
forming a third horizontal heat removal structure above the second die and connected to the first plurality of vertical heat dissipation structures; and
forming a second plurality of vertical heat dissipation structures above the second die to connect to the third horizontal heat removal structure above the second die.
8. The method of claim 7 , wherein forming the portion of the cooling structure further comprises:
forming a fourth horizontal heat remove structure above and connected to the second plurality of vertical heat dissipation structures.
9. A method, comprising:
forming a first die;
forming a second die;
forming a first bonding layer on a carrier substrate;
forming a plurality of first horizontal heat removal structures in the first bonding layer;
bonding, after forming the plurality of first horizontal heat removal structures in the first bonding layer, the first die to the carrier substrate using the first bonding layer;
forming a second bonding layer over the first die;
forming a plurality of second horizontal heat removal structures in the second bonding layer;
bonding, after forming the plurality of second horizontal heat removal structures in the second bonding layer, the first die and the second die using the second bonding layer to form a stacked semiconductor device;
forming, after bonding the first die and the second die using the second bonding layer, a dielectric layer around side surfaces of the second die;
forming a plurality of vertical heat dissipation structures in the dielectric layer around the side surfaces of the second die; and
forming an inter-die cooling structure through the first die and through the second die,
wherein the inter-die cooling structure connects to a horizontal heat removal structure of the plurality of first horizontal heat removal structures.
10. The method of claim 9 , wherein forming the dielectric layer around the side surfaces of the second die comprises:
forming a first portion of the dielectric layer around the side surfaces of the second die;
wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein the method further comprises:
forming a second portion of the dielectric layer around side surfaces of the first die; and
forming a second plurality of vertical heat dissipation structures in the second portion of the dielectric layer to connect to the plurality of second horizontal heat removal structures.
11. The method of claim 9 , further comprising:
forming another plurality of vertical heat dissipation structures above the second die.
12. The method of claim 9 , wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein the method further comprises:
forming a third horizontal heat removal structure above the second die and connected to the first plurality of vertical heat dissipation structures; and
forming a second plurality of vertical heat dissipation structures in the dielectric layer and around the first plurality of vertical heat dissipation structures.
13. The method of claim 9 , further comprising:
forming a third horizontal heat removal structure above the second die and connected to the inter-die cooling structure.
14. The method of claim 13 , further comprising:
forming a portion of the dielectric layer above the third horizontal heat removal structure.
15. The method of claim 14 , wherein the plurality of vertical heat dissipation structures is a first plurality of vertical heat dissipation structures; and
wherein the method further comprises:
forming a second plurality of vertical heat dissipation structures connected to the third horizontal heat removal structure.
16. The method of claim 15 , further comprising:
forming a third plurality of vertical heat dissipation structures around the first plurality of vertical heat dissipation structures.
17. The method of claim 16 , further comprising:
forming a fourth horizontal heat removal structure that connects to the third plurality of vertical heat dissipation structures.
18. The method of claim 17 , wherein the fourth horizontal heat removal structure is formed to connect to the second plurality of vertical heat dissipation structures.
19. The method of claim 17 , further comprising:
forming a third bonding layer on the fourth horizontal heat removal structure.
20. The method of claim 13 , wherein the third horizontal heat removal structure is formed to connect to the plurality of vertical heat dissipation structures.