Wafer frontside-backside through silicon via
A wafer frontside-backside through silicon via and methods of manufacture are disclosed. The method includes forming a plurality of frontside metalized vias into a partial depth of a substrate. The method further includes forming a backside via in the substrate which exposes, from the backside, the plurality of frontside metalized vias. The method further includes forming a metal in the via in contact with the plurality of metalized frontside vias.
1. A method, comprising:
forming a plurality of frontside metalized vias into a partial depth of a substrate;
mounting a frontside of the substrate to a glass handle wafer;
forming a backside via in the substrate which exposes, from the backside, the plurality of frontside metalized vias;
forming a metal in the backside via in contact with the plurality of metalized frontside vias;
removing the glass handle wafer from the frontside of the substrate; and
forming solder bumps on the frontside and backside of the substrate, wherein the solder bumps on the backside of the substrate are in direct contact with the metal.
2. The method of claim 1 , wherein the plurality of frontside metalized vias are one or more vias.
3. The method of claim 1 , wherein the plurality of frontside metalized vias are formed about 1% to 25% into the depth of the substrate.
4. The method of claim 1 , further comprising forming a wiring layer in contact with the plurality of frontside metalized vias.
5. The method of claim 1 , wherein the plurality of frontside metalized vias have a minimum spacing between the plurality of frontside metalized vias.
6. The method of claim 1 , further comprising mounting a handler to a frontside of the substrate and grinding a backside of the substrate, prior to the forming the backside via.
7. The method of claim 6 , wherein the forming the metal in the via comprises depositing a conductor on the backside via, which extends to an underside of the substrate.
8. The method of claim 7 , wherein the conductor is a titanium or chrome followed by copper and/or gold film stack.
9. The method of claim 6 , wherein the forming the metal in the backside via comprises filling the backside via with a metal or metal alloy, which extends to an underside of the substrate.
10. A method, comprising:
forming a plurality of vias partially into a substrate, from a frontside;
filling the plurality of vias with a metal;
mounting the substrate, from the frontside, on a glass handler wafer;
grinding a backside of the substrate;
forming a via into the substrate, from the backside of the substrate, to expose the plurality of vias;
metalizing the via to be in direct electrical contact with the plurality of vias;
removing the glass handler wafer from the substrate; and
forming solder bumps on the frontside and backside of the substrate, wherein the solder bumps on the backside of the substrate are in direct contact with the metalizing.
11. The method of claim 10 , wherein the metalizing of the via comprises depositing a conductor in the via in direct electrical contact with the plurality of vias.
12. The method of claim, 11 wherein the depositing includes forming metal on an underside of the substrate.
13. The method of claim 12 , wherein the metal is a chrome or titanium followed by copper and/or gold film stack.
14. The method of claim 10 , wherein the metalizing of the via comprises filling the via with a metal or metal alloy, which extends to an underside of the substrate.
15. The method of claim 10 , wherein the plurality of vias are two or more vias, with a minimal spacing between the plurality of vias.
16. The method of claim 10 , wherein the plurality of vias extend partially into the substrate to a depth of about 1% to 25%.
17. The method of claim 16 , wherein the plurality of vias extend through an insulator material on a top of the substrate.
18. A structure, comprising:
a substrate;
a plurality of frontside metalized vias partially in a depth of the substrate and extending completely through an insulator layer provided on a frontside surface of the substrate;
a plurality of frontside wirings formed in direct electrical contact with the frontside metalized vias and which is embedded with a dielectric layer;
a backside via partially in a depth of a backside of the substrate and which exposes the plurality of frontside metalized vias from the backside of the substrate;
a metalized layer on the backside via in the substrate and extending onto a bottom surface of the substrate, in direct electrical contact with the plurality of vias; and
solder bumps on the frontside surface and backside surface of the structure, wherein the solder bumps on the backside surface of the substrate are in direct contact with the metalized layer.
19. The structure of claim 18 , wherein the metalized layer on the backside comprises chrome followed by gold film stack.
20. The structure of claim 18 , wherein the plurality of frontside metalized vias extend through an insulator material on a top of the substrate.