Manufacture of 3 dimensional MIM capacitors in the last metal level of an integrated circuit
View Patent ↗A method is for fabricating an integrated circuit formed from a substrate and including several metallic interconnection levels in which, in a same plane parallel to the main plane of the substrate, is a plurality of thick horizontal metallic interconnection lines, as well as one or several MIM capacitors fitted with metallic electrodes that are orthogonal to the main plane of the substrate.
1. A micro-electronic device comprising:
a substrate and a plurality of metallic interconnection levels thereon, each comprising an insulating layer and at least one horizontal strip therein;
the insulating layer of a given metallic interconnection level having at least one trench passing therethrough;
a stack within the at least one trench and comprising a first metallic layer defining a first capacitor electrode, a dielectric layer on the first metallic layer, and a second metallic layer on the dielectric layer defining a second capacitor electrode; and
at least one vertical connection element coupling the at least one horizontal strip of the given metallic interconnection level with the at least one horizontal strip of a lower metallic interconnection level.
2. A micro-electronic device according to claim 1 , wherein a height of said at least one vertical connection element is less than a thickness of said insulating layer of the given metallic interconnection level.
3. A micro-electronic device according to claim 1 , further comprising at least one metallic material filling the at least one trench and in contact with said second metallic layer.
4. A micro-electronic device according to claim 3 , wherein said given metallic interconnection level is an uppermost metallic interconnection level and further comprising a plurality of metallic contact pads coupled thereto.
5. A micro-electronic device according to claim 1 , wherein the at least one trench has a bottom; wherein said first metallic layer is adjacent the bottom of the at least one trench and coupled to the at least one horizontal metallic strip of the lower metallic interconnection level; and wherein the respective at least one horizontal metallic strips of the given and lower metallic interconnection levels are parallel to a main plane defined by said substrate.
6. A micro-electronic device according to claim 5 , wherein said first metallic layer is in contact with said at least one vertical connection element.
7. A micro-electronic device according to claim 6 , wherein said at least one vertical connection element comprises a metallic block.
8. A micro-electronic device according to claim 5 , wherein said first thin metallic layer is in contact with said at least one horizontal metallic strip of the lower metallic interconnection level.
9. An integrated circuit comprising:
a substrate and a plurality of metallic interconnection levels thereon, each comprising an insulating layer and at least one horizontal strip therein;
the insulating layer of a given metallic interconnection level having at least one trench passing therethrough;
a stack within the at least one trench and comprising a first metallic layer defining a first capacitor electrode, a dielectric layer on the first metallic layer, and a second metallic layer on the dielectric layer defining a second capacitor electrode;
at least one vertical connection element coupling the at least one horizontal strip of the given metallic interconnection level with the at least one horizontal strip of a lower metallic interconnection level; and
at least one circuit module on said substrate and coupled to said first and second capacitor electrodes.
10. An integrated circuit according to claim 9 , wherein said at least one circuit module comprises at least one of a RF module and an analog module.
11. An integrated circuit according to claim 9 , wherein a height of said at least one vertical connection element is less than a thickness of said insulating layer of the given metallic interconnection level.
12. An integrated circuit according to claim 9 , further comprising at least one metallic material filling the at least one trench and in contact with said second metallic layer.
13. An integrated circuit according to claim 12 , wherein said given metallic interconnection level is an uppermost metallic interconnection level and further comprising a plurality of metallic contact pads coupled thereto.
14. An integrated circuit according to claim 9 , wherein the at least one trench has a bottom; wherein said first metallic layer is adjacent the bottom of the at least one trench and coupled to the at least one horizontal metallic strip of the lower metallic interconnection level; and wherein the respective at least one horizontal metallic strips of the given and lower metallic interconnection levels are parallel to a main plane defined by said substrate.
15. A method of making a micro-electronic device comprising:
forming a plurality of metallic interconnection levels on a substrate, each comprising an insulating layer and at least one horizontal strip therein, the insulating layer of a given metallic interconnection level having at least one trench passing therethrough;
forming a stack within the at least one trench and comprising a first metallic layer defining a first capacitor electrode, a dielectric layer on the first metallic layer, and a second metallic layer on the dielectric layer defining a second capacitor electrode; and
coupling the at least one horizontal strip of the given metallic interconnection level to the at least one horizontal strip of a lower metallic interconnection level with at least one vertical connection element.
16. A method according to claim 15 , wherein a height of the at least one vertical connection element is less than a thickness of the insulating layer.
17. A method according to claim 15 , further comprising filling the at least one trench with at least one metallic material.
18. A method according to claim 15 , wherein wherein the given metallic interconnection level is an uppermost metallic interconnection level and further comprising a plurality of metallic contact pads coupled thereto.
19. A method according to claim 15 , wherein the at least one trench is formed to reveal a first metallic element adjacent the at least one horizontal metallic strip of the lower metallic interconnection level; and further comprising forming at least one other trench to reveal a second metallic element adjacent the at least one horizontal metallic strip of the lower metallic interconnection level.
20. A method according to claim 15 , wherein the at least one trench is formed to reveal a first metallic element adjacent the at least one horizontal metallic strip of the lower metallic interconnection level; and further comprising forming at least one other trench to reveal the same metallic element.
21. A method according to claim 15 , wherein the at least one trench reveals the at least one horizontal metallic strip of the lower metallic interconnection layer.