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Details for Patent: 6,188,097

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Details for Patent: 6,188,097

Title: Rough electrode (high surface area) from Ti and TiN
Abstract:A technique for forming high surface area electrode or storage nodes for a capacitor and devices formed thereby, including depositing a first layer of conductive material on a substrate, such that a discontinuous layer is formed. A second conductive material layer is deposited over the discontinuous first conductive material layer, such that the second conductive material layer grows or accumulates on the discontinuous first conductive material layer at a faster rate than on the exposed areas of the substrate in the discontinuous first conductive material layer to form a rough conductive material layer.
Inventor(s): Derderian; Garo J. (Boise, ID), Sandhu; Gurtej S. (Boise, ID)
Assignee: Micron Technology, Inc. (Boise, ID)
Filing Date:Jul 02, 1997
Application Number:08/887,915
Claims:1. A storage node structure for a semiconductor capacitor having a discontinuous first conductive material layer including at least one exposed area exposing a portion of a substrate and a second conductive material layer over said discontinuous first conductive material layer and said at least one exposed area, a thickness of said second conductive material layer over said discontinuous first conductive material layer being greater than a thickness of said second conductive material layer over said portion of said substrate within said at least one exposed area, formed by a method comprising:

providing said substrate;

depositing said discontinuous first conductive material layer on said substrate, wherein said discontinuous first conductive material layer defines at least one exposed area exposing said portion of said substrate within said discontinuous first conductive material layer; and

depositing said second conductive material layer over said discontinuous first conductive material layer and said at least one exposed area, said second conductive material layer forming on said discontinuous first conductive material layer at a faster rate than on said portion of said substrate within said at least one exposed area.

2. The storage node of claim 1, wherein said substrate includes a via and wherein said discontinuous first conductive material layer forms on walls of said via.

3. The storage node of claim 1, wherein said substrate includes a capacitor structure and wherein said discontinuous first conductive material layer forms on walls of said capacitor structure.

4. The storage node of claim 1, wherein said substrate includes borophosphosilicate glass.

5. The storage node of claim 1, wherein depositing said discontinuous first conductive material layer includes a deposition technique selected from the group comprising sputter deposition and chemical vapor deposition.

6. The storage node of claim 1, wherein depositing said second conductive material layer includes a deposition technique selected from the group comprising sputter deposition and chemical vapor deposition.

7. The storage node of claim 1, wherein said discontinuous first conductive material layer comprises titanium and said second conductive material layer comprises titanium nitride.

8. The storage node of claim 7, wherein said titanium layer is deposited by a collimated sputtering technique.

9. The storage node of claim 7, wherein said titanium layer deposition includes a temperature of between about 20 and 600.degree. C.

10. The storage node of claim 7, wherein said titanium layer deposition includes a temperature of between about 300 and 400.degree. C.

11. The storage node of claim 7, wherein said titanium layer deposition includes a pressure of between about 0.4 mTorr and 1.0 Torr.

12. The storage node of claim 7, wherein said titanium layer deposition includes a pressure of about 0.6 mTorr.

13. The storage node of claim 7, wherein said titanium nitride layer deposition includes a temperature of between about 300 and 500.degree. C.

14. The storage node of claim 7, wherein said titanium nitride layer deposition includes a temperature of about 420.degree. C.

15. The storage node of claim 7, wherein said titanium nitride layer deposition includes a pressure of between about 40 mTorr and 10 Torr.

16. The storage node of claim 7, wherein said titanium nitride layer deposition includes a pressure of about 600 mTorr.

17. The storage node of claim 1, wherein said depositing said second conductive material layer over said discontinuous first conductive material layer forms nodules of titanium nitride.

18. The storage node of claim 17, wherein said titanium nitride nodules includes diameters of about 500 angstroms.

19. A semiconductor device having a capacitor including a discontinuous first conductive material layer including at least one exposed area exposing a portion of a substrate and a second conductive material layer over said discontinuous first conductive material layer and said at least one exposed area, a thickness of said second conductive material layer over said discontinuous first conductive material layer being greater than a thickness of said second conductive material layer over said portion of said substrate within said at least one exposed area, formed by a method comprising:

providing said substrate;

depositing said discontinuous first conductive material layer on said substrate, wherein said discontinuous first conductive material layer defines at least one exposed area exposing said portion of said substrate within said discontinuous first conductive material layer; and

depositing said second conductive material layer over said discontinuous first conductive material layer and said at least one exposed area, said second conductive material layer growing or accumulating on said discontinuous first conductive material layer at a faster rate than on said portion of said substrate within said at least one exposed area.

20. The semiconductor device of claim 19, wherein said substrate includes a via and wherein said discontinuous first conductive material layer forms on walls of said via.

21. The semiconductor device of claim 19, wherein said substrate includes a capacitor structure and wherein said discontinuous first conductive material layer forms on walls of said capacitor structure.

22. Tie semiconductor device of claim 19, wherein said substrate includes borophosphosilieate glass.

23. The semiconductor device of claim 19, wherein depositing said discontinuous first conductive material layer includes a deposition technique selected from the group comprising sputter deposition and chemical vapor deposition.

24. The semiconductor device of claim 19, wherein depositing said second conductive material layer includes a deposition technique selected from the group comprising sputter deposition and chemical vapor deposition.

25. The semiconductor device of claim 19, wherein said discontinuous first conductive material layer comprises titanium and said second conductive material layer comprises titanium nitride.

26. The semiconductor device of claim 25, wherein said titanium layer is deposited by a collimated sputtering technique.

27. The semiconductor device of claim 25, wherein said titanium layer deposition includes a temperature of between about 20 and 600.degree. C.

28. The semiconductor device of claim 25, wherein said titanium layer deposition includes a temperature of between about 300 and 400.degree. C.

29. The semiconductor device of claim 25, wherein said titanium layer deposition includes a pressure of between about 0.4 mTorr and 1.0 Torr.

30. The semiconductor device of claim 25, wherein said titanium layer deposition includes a pressure of about 0.6 mTorr.

31. The semiconductor device of claim 25, wherein said titanium nitride layer deposition includes a temperature of between about 300 and 500.degree. C.

32. The semiconductor device of claim 25, wherein said titanium nitride layer deposition includes a temperature of about 420.degree. C.

33. The semiconductor device of claim 25, wherein said titanium nitride layer deposition includes a pressure of between about 40 mTorr and 10 Torr.

34. The semiconductor device of claim 25, wherein said titanium nitride layer deposition includes a pressure of about 600 mTorr.

35. The semiconductor device of claim 19, wherein said depositing said second conductive material layer over said discontinuous first conductive material layer forms nodules of titanium nitride.

36. The semiconductor device of claim 35, wherein said titanium nitride nodules include diameters of about 500 angstroms.

37. A capacitor storage node, comprising:

a discontinuous first conductive material layer on a substrate, wherein said discontinuous first conductive material layer defines at least one exposed area exposing said substrate within said discontinuous first conductive material layer; and

a second conductive material layer over said discontinuous first conductive material layer and said at least one exposed area, wherein said second conductive material layer has a thickness over said discontinuous first conductive material layer greater than a thickness over said at least one exposed area defined within said discontinuous first conductive material layer.

38. A memory cell having at least one capacitor storage node, comprising:

a discontinuous first conductive material layer on a substrate, wherein said discontinuous first conductive material layer defines at least one open area exposing said substrate within said discontinuous first conductive material layer; and

a second conductive material layer over said discontinuous first conductive material layer and said at least one open area, wherein said second conductive material layer has a thickness over said discontinuous first conductive material layer greater than a thickness over said at least one open area defined within said discontinuous first conductive material layer.

39. A random access memory chip having at least one memory cell having at least one capacitor storage node, comprising:

a discontinuous first conductive material layer on a substrate, wherein said discontinuous first conductive material layer defines at least one open area exposing said substrate within said discontinuous first conductive material layer; and

a second conductive material layer over said discontinuous first conductive material layer and said at least one open area, wherein said second conductive material layer has a thickness over said discontinuous first conductive material layer greater than a thickness over said at least one open area defined within said discontinuous first conductive material layer.
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