Methods and procedures for engineering of composite conductive films by atomic layer deposition
View Patent ↗A composite film comprised of three layers is formed by ALD on a substrate with a substrate interface surface. A first layer is coupled to the substrate interface surface. The first layer provides adhesion to the substrate interface surface and initiation of layer by layer ALD growth. A second layer is positioned between the first and third layers and provides a conducting diffusion barrier between the substrate and subsequent overlaying film. A third layer has a surface that is configured to provide adhesion and a texture template in preparation for a subsequent overlaying film. The composite engineered barrier structures are applied to interconnect, capacitor and transistor applications.
1. A composite film formed on a substrate with a substrate interface surface, comprising:
a first layer coupled to the substrate interface surface, the first layer providing adhesion to the substrate interface surface and initiation of layer by layer ALD growth;
a second layer, positioned between and coupled to the first layer and a third layer to provide a conducting diffusion barrier between the substrate and a subsequent overlaying film; and
the third layer with a surface configured to provide adhesion and with a texture template in preparation for the subsequent overlaying film;
wherein at least one of the first, second and third layers have an interface that acts to capture migrating impurities including O, C, Cl, F, N, K, B and Na and the first, second and third layers each have a composition M1xM2yNz, wherein N is nitrogen and x is 0 to 0.9 y is 0 to 0.5 z is 0 to 0.5.
2. The composite film of claim 1 , wherein the composite film is a diffusion barrier for at least one of Cu, Al, W, F, or Cl.
3. The composite film of claim 1 , wherein the first layer seals a topography of at least one porous dielectric substrate.
4. The composite film of claim 3 , wherein the porous dielectric substrate has a pore size in the range of 4 to 40 Å.
5. The composite film of claim 1 , wherein the composite film is deposited on a damascene topography.
6. The composite film of claim 1 , wherein M1 is Ti and M2 is Ta and the first second and third layers each have different compositions.
7. The composite film of claim 1 , wherein M1 is Ti and M2 is W and the first second and third layers each have different compositions.
8. The composite film of claim 1 , wherein M1 is Ti and M2 is Mo and the first second and third layers each have different compositions.
9. The composite film of claim 1 , wherein M1 is Ti and M2 is Si and the first second and third layers each have different compositions.
10. The composite film of claim 1 , wherein M1 is Ta and M2 is W and the first second and third layers each have different compositions.
11. The composite film of claim 1 , wherein M1 is Ta and M2 is Mo and the first second and third layers each have different compositions.
12. The composite film of claim 1 , wherein M1 is Ta and M2 is Si and the first second and third layers each have different compositions.
13. A composite film formed on a substrate with a substrate interface surface, comprising:
a first layer coupled to the substrate interface surface, the first layer providing adhesion to the substrate interface surface and initiation of layer by layer ALD growth;
a second layer, positioned between and coupled to the first layer and a third layer to provide a conducting diffusion barrier between the substrate and a subsequent overlaying film; and
the third layer with a surface configured to provide adhesion and with a texture template in preparation for the subsequent overlaying film;
wherein the first, second and third layers each have a composition M1xM2yNz, wherein N is nitrogen and x is 0 to 0.9, y is 0 to 0.5, z is 0 to 0.5.
14. The composite film of claim 13 , wherein M1 is Ti and M2 is Ta and the first second and third layers each have different compositions.
15. The composite film of claim 13 , wherein M1 is Ti and M2 is W and the first second and third layers each have different compositions.
16. The composite film of claim 13 , wherein M1 is Ti and M2 is Mo and the first second and third layers each have different compositions.
17. The composite film of claim 13 , wherein M1 is Ti and M2 is Si and the first second and third layers each have different compositions.
18. The composite film of claim 13 , wherein M1 is Ta and M2 is W and the first second and third layers each have different compositions.
19. The composite film of claim 13 , wherein M1 is Ta and M2 is Mo and the first second and third layers each have different compositions.
20. The composite film of claim 13 , wherein M1 is Ta and M2 is Si and the first second and third layers each have different compositions.