Advanced interconnects containing an IMT liner
An interconnect structure is provided that includes a liner located between an electrically conductive structure and an interconnect dielectric material layer. The liner is composed of a phase change material that is insulating at a first temperature, and becomes conductive at a second temperature that is higher than the first temperature. The liner that is composed of such a phase change material is referred to as an “insulator-to/from metal transition (IMT)” liner. In the present application, an entirety of, or a portion of, the IMT liner may be changed from an insulating phase to a conductive phase by increasing the temperature (i.e., heating) of the liner so as to provide a redundancy path in which electrons can flow.
1. An interconnect structure comprising:
an interconnect dielectric material layer having at least one opening located therein;
an insulator-to/from metal transition (IMT) liner lining the sidewall and bottom wall of the at least one opening, wherein the IMT liner is composed of a phase change material that is insulating at a first temperature, and becomes conductive at a second temperature that is higher than the first temperature; and,
an electrically conductive structure located directly on the IMT liner, wherein the electrically conductive structure and the IMT liner fill in an entirety of the at least one opening.
2. The interconnect structure of claim 1 , wherein the IMT liner has a topmost surface that is coplanar with a topmost surface of the electrically conductive structure and the interconnect dielectric material layer.
3. The interconnect structure of claim 1 , wherein the IMT liner has a first surface in direct physical contact with the electrically conductive structure, and a second surface opposite the first surface that is in direct physical contact with the interconnect dielectric material layer.
4. The interconnect structure of claim 1 , wherein IMT liner is U-shaped.
5. The interconnect structure of claim 1 , wherein the IMT liner is composed of a vanadium oxide, a titanium oxide, NiTi, ZnAuCu, or alloys thereof.
6. The interconnect structure of claim 1 , wherein the electrically conductive structure extends partially into the interconnect dielectric material layer.
7. The interconnect structure of claim 1 , wherein the electrically conductive structure is a via structure, a line structure or a combined via/line structure.
8. The interconnect structure of claim 1 , wherein the IMT liner provides a shunting path when the electrically conductive structure fails.
9. The interconnect structure of claim 1 , wherein the IMT liner becomes a conductive shunt for current in an area in which a void is formed during an electromigration event.
10. The interconnect structure of claim 9 , wherein the IMT liner in areas in which the void is absent remains an insulator material.
11. An interconnect structure comprising:
an electrically conductive structure embedded in an interconnect dielectric material layer;
an insulator-to/from metal transition (IMT) liner located between the electrically conductive structure and the interconnect dielectric material layer, wherein the IMT liner is composed of a phase change material that is insulating at a first temperature, and becomes conductive at a second temperature that is higher than the first temperature; and
a diffusion barrier liner located between the IMT liner and the electrically conductive structure, wherein the diffusion barrier has a first surface in directly physically contact with the IMT liner and a second surface, opposite the first surface that is in direct physically contact with the electrically conductive structure.
12. The interconnect structure of claim 11 , wherein the IMT liner provides a shunting path when the electrically conductive structure fails.
13. The interconnect structure of claim 11 , wherein the IMT liner becomes a conductive shunt for current in an area in which a void is formed during an electromigration event.
14. The interconnect structure of claim 13 , wherein the IMT liner in areas in which the void is absent remains an insulator material.
15. An interconnect structure comprising:
an electrically conductive structure embedded in an interconnect dielectric material layer;
an insulator-to/from metal transition (IMT) liner located between the electrically conductive structure and the interconnect dielectric material layer, wherein the IMT liner is composed of a chase change material that is insulating at a first temperature, and becomes conductive at a second temperature that is higher than the first temperature; and
a diffusion barrier liner located between the IMT liner and the interconnect dielectric material layer, wherein the diffusion barrier has a first surface directly contacting the interconnect dielectric material and a second surface, opposite the first surface that directly contacts the IMT liner.
16. The interconnect structure of claim 15 , wherein the IMT liner provides a shunting path when the electrically conductive structure fails.
17. The interconnect structure of claim 15 , wherein the IMT liner becomes a conductive shunt for current in an area in which a void is formed during an electromigration event.
18. The interconnect structure of claim 17 , wherein the IMT liner in areas in which the void is absent remains an insulator material.