Composite interposer structure and method of providing same

1. An interposer comprising:

a substrate comprising an inorganic material;

a first insulator structure and first interconnects therein; and

a second insulator structure and second interconnects therein, wherein respective inorganic dielectrics of the first insulator structure and the second insulator structure adjoin each other at a material interface, which extends to each of the substrate and a first side of the interposer;

wherein a first hardware interface, to couple the interposer to a first IC chip, spans the material interface at the first side;

wherein a second hardware interface, to couple the interposer to a second IC chip, includes contacts, at a first surface of the first insulator structure, which are coupled to the first hardware interface via the first interconnects; and

wherein a third hardware interface, at a second side of the interposer opposite the first side, is coupled to the first hardware interface via the second interconnects.

2. The interposer of claim 1 , wherein the first hardware interface comprises:

first contacts at the first surface; and

second contacts at a second surface of the second insulator;

wherein a first metallization feature pitch of the first contacts is smaller than a corresponding second metallization feature pitch of the second contacts.

3. The interposer of claim 2 , wherein the second hardware interface comprises:

third contacts at the first surface; and

fourth contacts at the second surface;

wherein the third hardware interface further comprises fifth contacts and sixth contacts, wherein the second interconnects are electrically coupled each between a respective one of the second contacts and a respective one of the fifth contacts, and wherein the interposer further comprises third interconnects in the second insulator structure, the third interconnects are electrically coupled each between a respective one of the fourth contacts and a respective one of the sixth contacts.

4. The interposer of claim 1 , wherein the material interface comprises an artifact of one of a cut process, an etch process, a grind process, or a polish process.

5. The interposer of claim 1 , wherein, at the first side, the first insulator comprises an artifact of one of a cut process, an etch process, a grind process, or a polish process.

6. The interposer of claim 1 , wherein the first interconnects comprise a first metallization layer, wherein the second interconnects comprises a second metallization layer which, of any metallization layers of the second interconnects, is most aligned vertically with the first metallization layer, wherein a side of the first metallization layer is offset vertically from a corresponding side of the second metallization layer.

7. The interposer of claim 1 , wherein a first dielectric material of the first insulator structure and a second dielectric material of the second insulator structure, the first dielectric material other than the second dielectric material, each extend to the material interface.

8. The interposer of claim 7 , wherein the first dielectric material comprises a low-k dielectric.

9. The interposer of claim 1 , further comprising active circuit components between the substrate and the first insulator structure, the active circuit components coupled, via the first interconnects, between the first hardware interface and the second hardware interface.

10. The interposer of claim 1 , further comprising a semiconductor substrate between the first insulator structure and the substrate, wherein one of the first interconnects further extends through the semiconductor substrate.

11. A method comprising:

forming a first insulator structure and first interconnects therein, including bonding a chiplet to a substrate which comprises an inorganic material; and

forming on the substrate a second insulator structure and second interconnects therein, wherein respective inorganic dielectrics of the first insulator structure and the second insulator structure adjoin each other at a material interface which extends to each of the substrate and a first side of an interposer which comprises the substrate, the first insulator structure, the insulator structure, the first interconnects, and the second interconnects;

wherein a first hardware interface of the interposer, to couple the interposer to a first IC chip, spans the material interface at the first side;

wherein a second hardware interface of the interposer, to couple the interposer to a second IC chip, includes contacts, at a first surface of the first insulator structure, which are coupled to the first hardware interface via the first interconnects; and

wherein a third hardware interface of the interposer, at a second side of the interposer opposite the first side, is coupled to the first hardware interface via the second interconnects.

12. The method of claim 11 , wherein the first hardware interface comprises:

first contacts at the first surface; and

second contacts at a second surface of the second insulator;

wherein a first metallization feature pitch of the first contacts is smaller than a corresponding second metallization feature pitch of the second contacts.

13. The method of claim 11 , wherein the material interface comprises an artifact of one of a cut process, an etch process, a grind process, or a polish process.

14. The method of claim 11 , wherein the first interconnects comprise a first metallization layer, wherein the second interconnects comprises a second metallization layer which, of any metallization layers of the second interconnects, is most aligned vertically with the first metallization layer, wherein a side of the first metallization layer is offset vertically from a corresponding side of the second metallization layer.

15. The method of claim 11 , wherein a first dielectric material of the first insulator structure and a second dielectric material of the second insulator structure, the first dielectric material other than the second dielectric material, each extend to the material interface.

16. A system comprising:

an interposer comprising:

a substrate comprising an inorganic material;

a first insulator structure and first interconnects therein; and

a second insulator structure and second interconnects therein, wherein respective inorganic dielectrics of the first insulator structure and the second insulator structure adjoin each other at a material interface, which extends to each of the substrate and a first side of the interposer;

a first IC chip coupled to the interposer via a first hardware interface which spans the material interface at the first side;

a second IC chip coupled to the interposer via a a second hardware interface comprising contacts, at a first surface of the first insulator structure, which are coupled to the first hardware interface via the first interconnects; and

a circuit board coupled to the interposer via a third hardware interface, at a second side of the interposer opposite the first side, which is coupled to the first hardware interface via the second interconnects.

17. The system of claim 16 , wherein the first hardware interface comprises:

first contacts at the first surface; and

second contacts at a second surface of the second insulator;

wherein a first metallization feature pitch of the first contacts is smaller than a corresponding second metallization feature pitch of the second contacts.

18. The system of claim 16 , wherein the first interconnects comprise a first metallization layer, wherein the second interconnects comprises a second metallization layer which, of any metallization layers of the second interconnects, is most aligned vertically with the first metallization layer, wherein a side of the first metallization layer is offset vertically from a corresponding side of the second metallization layer.

19. The system of claim 16 , wherein a first dielectric material of the first insulator structure and a second dielectric material of the second insulator structure, the first dielectric material other than the second dielectric material, each extend to the material interface.

20. The system of claim 16 , further comprising active circuit components between the substrate and the first insulator structure, the active circuit components coupled, via the first interconnects, between the first hardware interface and the second hardware interface.