Decoupling capacitor inside gate cut trench

1. A semiconductor structure comprising:

a first power rail;

one or more vertically stacked contact vias connecting the first power rail to a top surface of a trench contact, wherein the trench contact connecting to a metal and a ferroelectric layer in a portion of a first de-coupling capacitor; and

the first de-coupling capacitor directly contacting at least one gate and in a first portion of a semiconductor substrate, wherein the first de-coupling capacitor includes the layer of a ferroelectric material over a first dielectric layer and contacting a portion of an isolation trench, and wherein the metal is in contact with the ferroelectric material.

2. The semiconductor structure of claim 1 , wherein the first de-coupling capacitor is under and parallel to the first power rail.

3. The semiconductor structure of claim 1 , wherein a portion of the metal is under a dielectric cap.

4. The semiconductor structure of claim 3 , wherein a top surface of the metal is above a top surface of the semiconductor substrate and below a top surface of an isolation trench that is on the semiconductor substrate.

5. The semiconductor structure of claim 1 , wherein the first dielectric layer is a layer of silicon dioxide.

6. The semiconductor structure of claim 1 , wherein the ferroelectric material is inside the portion of the isolation trench and the first dielectric layer.

7. The semiconductor structure of claim 1 , wherein the ferroelectric material has a top surface below a bottom surface of the at least one gate.

8. The semiconductor structure of claim 1 , wherein the ferroelectric material has the top surface above the top surface of the first dielectric layer.

9. The semiconductor structure of claim 3 , wherein the metal is composed of more than one metal material.

10. The semiconductor structure of claim 1 , wherein a portion of the first de-coupling capacitor is under a dielectric cap that is under a source/drain contact.

11. The semiconductor structure of claim 1 , wherein the ferroelectric material is composed of a material selected from the group consisting of hafnium zirconium oxide, lead zirconium titanate, silicon-doped hafnium oxide, and barium titanite.

12. A semiconductor structure comprising:

a first power rail;

one or more vertically stacked contact vias connecting the first power rail to a portion of a first de-coupling capacitor;

the first de-coupling capacitor in a first portion of a semiconductor substrate and a portion of an isolation trench, wherein the first de-coupling capacitor is parallel the first power rail;

a second power rail;

one or more vertically stacked contact vias connecting the second power rail to a portion of a second de-coupling capacitor in a second portion of the semiconductor substrate and the isolation trench; and

one or more active device regions on a third portion of the semiconductor substrate adjacent to the first portion of the semiconductor substrate and on a fourth portion of the semiconductor substrate adjacent to the second portion of the semiconductor substrate, wherein the second portion of the semiconductor substrate and the fourth portion of the semiconductor substrate are doped.

13. The semiconductor structure of claim 12 , wherein the second portion of the semiconductor substrate and the fourth portion of the semiconductor substrate are doped with a doping material selected from the group of an n-type dopant material and a p-type dopant material.

14. The semiconductor structure of claim 12 , wherein the first de-coupling capacitor includes a first dielectric layer on the first portion of the semiconductor substrate.

15. The semiconductor structure of claim 14 , wherein the first de-coupling capacitor includes a layer of a ferroelectric material over the first dielectric layer and contacting a portion of the isolation trench directly above the semiconductor substrate.

16. The semiconductor structure of claim 15 , wherein a metal is in contact with the ferroelectric material, and wherein a first portion of the metal is under a first dielectric cap.

17. The semiconductor structure of claim 16 , wherein the one or more vertically stacked contact vias connecting the first power rail connect to a top surface of a second portion of the metal and the ferroelectric layer.

18. The semiconductor structure of claim 12 , wherein the ferroelectric material is inside the portion of the isolation trench and the first dielectric layer.

19. The semiconductor structure of claim 12 , wherein the ferroelectric material has the top surface above the top surface of the first dielectric layer.

20. The semiconductor structure of claim 15 , wherein the metal is composed of more than one metal material.

21. The semiconductor structure of claim 12 , wherein a portion of the first de-coupling capacitor is under a second dielectric cap that is under a source/drain contact.