Memory cell materials and semiconductor device structures

1. A memory cell material, comprising:

a first portion of a heterogeneous dielectric material over a structure;

discrete, substantially uniformly spaced conductive particles over the first portion of the heterogeneous dielectric material, at least a portion of the discrete, substantially uniformly spaced conductive particles adsorbed to a surface of the first portion of the heterogeneous dielectric material;

a second portion of the heterogeneous dielectric material on and between the at least a portion of the discrete, substantially uniformly spaced conductive particles, the second portion of the heterogeneous dielectric material having substantially the same thickness and a different material composition than the first portion of the heterogeneous dielectric material;

additional discrete, substantially uniformly spaced conductive particles over the second portion of the heterogeneous dielectric material, at least some of the additional discrete, substantially uniformly spaced conductive particles exhibiting substantially the same size as at least some of the discrete, substantially uniformly spaced conductive particles most proximate thereto but completely laterally offset from the at least some of the discrete, substantially uniformly spaced conductive particles;

a third portion of the heterogeneous dielectric material on and between the additional discrete, substantially uniformly spaced conductive particles and having substantially the same thickness as each of the first portion of the heterogeneous dielectric material and the second portion of the heterogeneous dielectric material; and

further discrete, substantially uniformly spaced conductive particles over the third portion of the heterogeneous dielectric material, at least some of the further discrete, substantially uniformly spaced conductive particles exhibiting substantially the same size as and laterally overlapping at least some of the discrete, substantially uniformly spaced conductive particles most proximate thereto.

2. The memory cell material of claim 1 , wherein the discrete, substantially uniformly spaced conductive particles are heterogeneously distributed over the first portion of the heterogeneous dielectric material.

3. The memory cell material of claim 1 , wherein the discrete, substantially uniformly spaced conductive particles exhibit a different distribution density than the additional discrete, substantially uniformly spaced conductive particles.

4. The memory cell material of claim 1 , wherein the additional discrete, substantially uniformly spaced conductive particles are selected from the group consisting of Pt particles, Ta particles, Ru particles, Rh particles, Cu particles, Al particles, and Co particles.

5. A semiconductor device structure, comprising:

a memory cell material on a structure and comprising:

at least four vertically adjacent portions of a heterogeneous dielectric material; and

discrete, substantially uniformly sized rhodium-containing particles interposed between each of the at least four vertically adjacent portions of the heterogeneous dielectric material,

a first portion of the discrete, substantially uniformly sized rhodium-containing particles adsorbed to a first of the at least four vertically adjacent portions of the heterogeneous dielectric material,

a second portion of the discrete, substantially uniformly sized rhodium-containing particles adsorbed to a second of the at least four vertically adjacent portions of the heterogeneous dielectric material, none of the discrete, substantially uniformly sized rhodium-containing particles of the second portion substantially laterally overlapping any of the discrete, substantially uniformly sized rhodium-containing particles of the first portion, and

a third portion of the discrete, substantially uniformly sized rhodium-containing particles adsorbed to a third of the at least four vertically adjacent portions of the heterogeneous dielectric material, at least some of the discrete, substantially uniformly sized rhodium-containing particles of the third portion completely laterally offset from at least some of the discrete, substantially uniformly sized rhodium-containing particles of the second portion and substantially laterally overlapping at least some of the discrete, substantially uniformly sized rhodium-containing particles of the first portion.

6. The semiconductor device structure of claim 5 , wherein the first portion of the discrete, substantially uniformly sized rhodium-containing particles comprises a different material composition than the second portion of the discrete, substantially uniformly sized rhodium-containing particles.

7. The semiconductor device structure of claim 5 , wherein at least one portion of the discrete, substantially uniformly sized rhodium-containing particles comprises substantially the same material composition as at least one other portion of the discrete, substantially uniformly sized rhodium-containing particles.

8. The semiconductor device structure of claim 5 , wherein the heterogeneous dielectric material comprises two or more of an oxide dielectric, a nitride dielectric, an oxynitride dielectric, and amorphous carbon.

9. The semiconductor device structure of claim 6 , wherein:

adjacent rhodium-containing particles of the first portion of the discrete, substantially uniformly sized rhodium-containing particles are substantially uniformly spaced apart from one another; and

additional adjacent rhodium-containing particles of the second portion of the discrete, substantially uniformly sized rhodium-containing particles are substantially uniformly spaced apart from one another.

10. The semiconductor device structure of claim 9 , wherein the adjacent rhodium-containing particles of the first portion of the discrete, substantially uniformly sized rhodium-containing particles are spaced apart from one another by a different distance than the additional adjacent rhodium-containing particles of the second portion of the discrete, substantially uniformly sized rhodium-containing particles.

11. The semiconductor device structure of claim 9 , wherein the adjacent rhodium-containing particles of the first portion of the discrete, substantially uniformly sized rhodium-containing particles are spaced apart from one another by substantially the same distance as the additional adjacent rhodium-containing particles of the second portion of the discrete, substantially uniformly sized rhodium-containing particles.

12. The semiconductor device structure of claim 5 , wherein each of the discrete, substantially uniformly sized rhodium-containing particles individually comprises a conductive metal material.

13. A semiconductor device structure, comprising:

a first dielectric film over a structure and having a first thickness within a range of from about 3 monolayers to about 5 monolayers;

first conductive nanoparticles adsorbed to an upper surface of the first dielectric film, adjacent conductive nanoparticles of the first conductive nanoparticles spaced apart from one another by substantially the same distance;

a second dielectric film on and between the first conductive nanoparticles and on portions of the first dielectric film not covered by the first conductive nanoparticles, the second dielectric film having a different material composition than the first dielectric film and having a second thickness within a range of from about 3 monolayers to about 5 monolayers;

second conductive nanoparticles adsorbed to an upper surface of the second dielectric film and laterally offset from the first conductive nanoparticles, adjacent conductive nanoparticles of the second conductive nanoparticles spaced apart from one another by substantially the same distance;

a third dielectric film on and between the second conductive nanoparticles and on portions of the second dielectric film not covered by the first conductive nanoparticles, the third dielectric film having a different material composition than at least one of the first dielectric film and the second dielectric film; and

third conductive nanoparticles adsorbed to an upper surface of the third dielectric film and laterally offset from the second conductive nanoparticles, adjacent conductive nanoparticles of the third conductive nanoparticles spaced apart from one another by substantially the same distance.

14. The semiconductor device structure of claim 13 , wherein one or more of the first conductive nanoparticles, the second conductive nanoparticles, and the third conductive nanoparticles comprise one or more of Al nanoparticles and Cu nanoparticles.

15. The semiconductor device structure of claim 13 , wherein the first thickness of the first dielectric film is different than the second thickness of the second dielectric film.

16. The memory cell material of claim 1 , wherein a material composition of the third portion of the heterogeneous dielectric material is different than that of at least one of the first portion of the heterogeneous dielectric material and the second portion of the heterogeneous dielectric material.

17. The memory cell material of claim 1 , wherein:

an overall thickness of the heterogeneous dielectric material is less than or equal to about 100 Å; and

each of the first portion of the heterogeneous dielectric material, the second portion of the heterogeneous dielectric material, and the third portion of the heterogeneous dielectric material individually has a thickness less than or equal to about 10 monolayers.

18. The memory cell material of claim 1 , wherein at least one of the first portion of the heterogeneous dielectric material, the second portion of the heterogeneous dielectric material, and the third portion of the heterogeneous dielectric material comprises amorphous carbon.

19. The semiconductor device structure of claim 13 , wherein each of the at least four vertically adjacent portions of the heterogeneous dielectric material has substantially the same thickness as each other of the at least four vertically adjacent portions of the heterogeneous dielectric material.