Reliable packaging and interconnect structures
View Patent ↗Methods and apparatus for forming a semiconductor device are provided which may include any number of features. One feature is a method of forming an interconnect structure that results in the interconnect structure having a top surface and portions of the side walls of the interconnect structure covered in a dissimilar material. In some embodiments, the dissimilar material can be a conductive material or a nano-alloy. The interconnect structure can be formed by removing a portion of the interconnect structure, and covering the interconnect structure with the dissimilar material. The interconnect structure can comprise a damascene structure, such as a single or dual damascene structure, or alternatively, can comprise a silicon-through via (TSV) structure.
1. A method of manufacturing a structure comprising a semiconductor device, the method comprising:
forming a first opening in a substrate, the first opening extending down into the substrate;
forming a first feature for an interconnect structure, the first feature being electrically conductive and having a sidewall in the first opening; and
forming a second feature overlying the first feature and extending down into the first opening along the sidewall of the first feature, the second feature comprising a first material different from any material in the sidewall and top of the first feature.
2. The method of claim 1 further comprising:
forming a layer over the substrate and the first and second features; and
etching the layer to form a second opening exposing the second feature, the second feature serving as an etch stop during the etching.
3. The method of claim 2 further comprising forming an interconnect structure in the second opening.
4. The method of claim 1 wherein forming the first feature comprises:
forming a conductive layer in the first opening, the conductive layer comprising the first feature; and
removing a portion of the conductive layer to form the sidewall of the first feature.
5. The method of claim 4 wherein removing a portion of the conductive layer comprises:
oxidizing the portion of the conductive layer; and
removing the oxidized portion of the conductive layer to form the sidewall of the conductive layer.
6. The method of claim 1 wherein the second feature is conductive and physically contacts the first feature.
7. The method of claim 6 wherein the second feature comprises one or more of a group consisting of cobalt, nickel, tungsten, and phosphorus.
8. The method of claim 1 wherein the first opening passes through the substrate.
9. The method of claim 1 wherein the second feature has a thickness of 5 to 200 nm.
10. The method of claim 1 wherein the second feature covers at least 10% of the first feature's sidewall.
11. The method of claim 1 wherein the second feature covers at least 33% of the first feature's sidewall.
12. The method of claim 1 wherein the second feature is non-conductive.
13. A device comprising:
a substrate comprising a first opening extending down into the substrate;
a first feature which is electrically conductive and comprises at least a portion of an interconnect structure, the first feature having a sidewall in the first opening; and
a second feature overlying the first feature and extending down into the first opening along the sidewall of the first feature, the second feature comprising a first material different from any material in the sidewall and top of the first feature.
14. The device of claim 13 further comprising a third feature overlying the substrate and the first and second features;
wherein the third feature comprises a second opening extending down to the second feature, the second feature covering the first feature at a bottom of the second opening.
15. The device of claim 14 wherein the third feature is dielectric, and the device further comprises an interconnect structure in the second opening, the interconnect structure electrically contacting the first feature through the second feature.
16. The device of claim 13 wherein the second feature is conductive and physically contacts the first feature.
17. The device of claim 16 wherein the second feature comprises one or more of a group consisting of cobalt, nickel, tungsten, and phosphorus.
18. The device of claim 13 wherein the second feature is non-conductive and physically contacts the first feature.
19. The device of claim 13 wherein the first opening passes through the substrate.
20. The device of claim 13 wherein the second feature has a thickness of 5 to 200 nm.
21. The device of claim 13 wherein the second feature covers at least 10% of the first feature's sidewall.
22. The device of claim 13 wherein the second feature covers at least 33% of the first feature's sidewall.