Interposer and packaging substrate having the interposer
An interposer is provided, including a composite body and a plurality of conductive through vias penetrating the composite body. The composite body includes at least a main layer and at least a combining layer stacked on one another. The combining layer prevents the main layer from being cracked. The combining layer is more flexible than the main layer. The combining layer prevents the main layer from being cracked. Therefore, the main layer can be thinned on demands, and the interposer can be thinned accordingly.
1. An interposer, comprising: a composite body comprising: a first main layer of a material selected from the group consisting of glass, silicon and ceramic, a second main layer of a material selected from the group consisting of glass, silicon and ceramic, and an adhesive layer disposed between the first main layer and the second main layer, wherein the adhesive layer is in direct surface contact with the first and second main layers and combines the first main layer to the second main layer; and a plurality of conductive through vias passing through the composite body, wherein a thickness of the adhesive layer is smaller than a thickness of each of the first and second main layers: the composite body has a first outermost layer that is a first dielectric layer, the first dielectric layer is disposed on the first main layer, and each of the conductive through vias has a straight sidewall that extends continuously, without interruption, through the first dielectric layer, the first main layer, the adhesive layer, and the second main layer; wherein a conductive material of each of the conductive through vias extends continuously, without interruption, through the first dielectric layer, the first main layer, the adhesive layer, and the second main layer; and wherein the first dielectric layer is in direct surface contact with the first main layer, is more flexible than the first and second main layers, and has a thickness greater than the thickness of the adhesive layer.
2. The interposer of claim 1 , wherein the adhesive layer comprises polyimide (PI) or benzocyclobutene (BCB).
3. The interposer of claim 1 , wherein the composite body has a second outermost layer that is a second dielectric layer, the second dielectric layer is disposed on the second main layer, and the conductive material and the sidewall of each of the conductive through vias extend continuously, without interruption, through the first dielectric layer, the first main layer, the adhesive layer, the second main layer, and the second dielectric layer.
4. The interposer of claim 1 , further comprising: a redistribution layer disposed on the first dielectric layer and electrically connected to the conductive through vias, wherein the redistribution layer has a plurality of conductive pads.
5. The interposer of claim 1 , wherein the adhesive layer is more flexible than the first and second main layers.
6. The interposer of claim 3 , wherein the second dielectric layer is in direct surface contact with the second main layer, is more flexible than the first and second main layers, and has a thickness greater than the thickness of the adhesive layer.
7. The interposer of claim 3 , further comprising:
a first redistribution layer disposed on top of the first dielectric layer and electrically connected to the conductive through vias; and
a second redistribution layer disposed on bottom of the second dielectric layer and electrically connected to the conductive through vias,
wherein a number of conductive layers in the second redistribution layer is greater than a number of conductive layers in the first redistribution layer.
8. The interposer of claim 6 , wherein the thickness of each of the first and second dielectric layers is less than 10 μm.
9. The interposer of claim 7 , further comprising:
a chip on top of and electrically coupled to the first redistribution layer.
10. The interposer of claim 7 , further comprising:
a packaging material wrapping four sides of both the composite body and the first redistribution layer,
wherein the second redistribution layer extends over and covers a bottom of the packaging material.
11. A packaging substrate, comprising:
a carrying structure; and
an interposer embedded in the carrying structure and comprising:
a composite body comprising:
a first main layer of a material selected from the group consisting of glass, silicon and ceramic,
a second main layer of a material selected from the group consisting of glass, silicon and ceramic,
a third main layer of a material selected from the group consisting of glass, silicon and ceramic,
a first adhesive layer disposed between the first main layer and the second main layer, wherein the first adhesive layer is in direct surface contact with the first and second main layers and combines the first main layer to the second main layer,
a second adhesive layer disposed between the second main layer and the third main layer, wherein the second adhesive layer is in direct surface contact with the second and third main layers and combines the second main layer to the third main layer,
a first outermost layer that is a first dielectric layer, the first dielectric layer disposed on the first main layer,
a second outermost layer that is a second dielectric layer, the second dielectric layer disposed on the third main layer;
a plurality of conductive through vias passing through the composite body;
a first redistribution layer disposed on top of the first dielectric layer and electrically connected to the conductive through vias; and
a second redistribution layer disposed on bottom of the second dielectric layer and electrically connected to the conductive through vias,
wherein a number of conductive layers in the second redistribution layer is greater than a number of conductive layers in the first redistribution layer.
12. The packaging substrate of claim 11 , wherein the carrying structure comprises a core layer, and the interposer is embedded in the core layer.
13. The packaging substrate of claim 11 , wherein a thickness of the second redistribution layer is greater than a thickness of the first redistribution layer.
14. The packaging substrate of claim 11 , wherein each of the first and second adhesive layers comprises polyimide (PI) or benzocyclobutene (BCB).
15. The packaging substrate of claim 11 , wherein
the first and third main layers are made of the same material, and
the second main layer is made of a material different from the material of the first and third main layers.
16. The packaging substrate of claim 11 , wherein
a thickness of each of the first and second adhesive layers is smaller than a thickness of each of the first, second and third main layers.
17. The packaging substrate of claim 12 , wherein
the core layer has an opening,
the interposer is received in the opening, and
the carrying structure further comprises:
a filling material filled in the opening to fix the interposer, wherein the filling material inside the opening covers upper, lower and side surfaces of the interposer, and
an upper covering layer covering an upper surface of the core layer and an upper surface of the filling material in the opening, and
a lower covering layer covering a lower surface of the core layer and a lower surface of the filling material in the opening.
18. The packaging substrate of claim 16 , wherein
the first dielectric layer is in direct surface contact with the first main layer, is more flexible than the first, second and third main layers, and has a thickness greater than the thickness of each of the first and second adhesive layers, and
a conductive material and a sidewall of each of the conductive through vias extend continuously, without interruption, through the first dielectric layer, the first main layer, the first adhesive layer, the second main layer, the second adhesive layer, and the third main layer.
19. The packaging substrate of claim 18 , wherein
the second dielectric layer is in direct surface contact with the third main layer, is more flexible than the first, second and third main layers, and has a thickness greater than the thickness of each of the first and second adhesive layers, and
the conductive material and the sidewall of each of the conductive through vias extend continuously, without interruption, through the first dielectric layer, the first main layer, the first adhesive layer, the second main layer, the second adhesive layer, the third main layer and the second dielectric layer.
20. A packaging substrate, comprising:
a carrying structure; and
an interposer embedded in the carrying structure and comprising:
a composite body comprising:
a first main layer of a material selected from the group consisting of glass, silicon and ceramic,
a second main layer of a material selected from the group consisting of glass, silicon and ceramic,
a third main layer of a material selected from the group consisting of glass, silicon and ceramic,
a first adhesive layer disposed between the first main layer and the second main layer, wherein the first adhesive layer is in direct surface contact with the first and second main layers and combines the first main layer to the second main layer, and
a second adhesive layer disposed between the second main layer and the third main layer, wherein the second adhesive layer is in direct surface contact with the second and third main layers and combines the second main layer to the third main layer; and
a plurality of conductive through vias passing through the composite body,
wherein
a thickness of each of the first and second adhesive layers is smaller than a thickness of each of the first, second and third main layers,
the composite body has a first outermost layer that is a first dielectric layer,
the first dielectric layer is in direct surface contact with the first main layer, is more flexible than the first, second and third main layers, and has a thickness greater than the thickness of each of the first and second adhesive layers,
a conductive material of each of the conductive through vias extends continuously, without interruption, through the first dielectric layer, the first main layer, the first adhesive layer, the second main layer, the second adhesive layer, and the third main layer,
the composite body has a second outermost layer that is a second dielectric layer,
the second dielectric layer is in direct surface contact with the third main layer, is more flexible than the first, second and third main layers, and has a thickness greater than the thickness of each of the first and second adhesive layers,
the conductive material of each of the conductive through vias extends continuously, without interruption, through the first dielectric layer, the first main layer, the first adhesive layer, the second main layer, the second adhesive layer, the third main layer and the second dielectric layer, and
the thickness of each of the first and second dielectric layers is less than 10 μm.