Methods for depositing high-K dielectrics
Methods for depositing high-K dielectrics are described, including depositing a first electrode on a substrate, wherein the first electrode is chosen from the group consisting of platinum and ruthenium, applying an oxygen plasma treatment to the exposed metal to reduce the contact angle of a surface of the metal, and depositing a titanium oxide layer on the exposed metal using at least one of a chemical vapor deposition process and an atomic layer deposition process, wherein the titanium oxide layer comprises at least a portion rutile titanium oxide.
1. A method for forming a stack comprising:
depositing a platinum electrode on a substrate;
applying an oxygen plasma treatment to the platinum electrode; and
depositing a titanium oxide layer on the platinum electrode using at least one of a chemical vapor deposition process and an atomic layer deposition process, wherein the titanium oxide layer comprises at least a portion rutile titanium oxide; and
annealing the stack using a rapid thermal oxidation (RTO) process of at least approximately 600° C.
2. The method for forming a stack according to claim 1 , wherein applying the oxygen plasma comprises using one of a high density plasma and an atmospheric plasma.
3. The method for forming a stack according to claim 1 , wherein the titanium oxide layer has an X-Ray Diffraction peak associated with rutile titanium oxide.
4. The method for forming a stack according to claim 1 , wherein depositing the platinum electrode comprises depositing platinum using physical vapor deposition (PVD) with a pedestal temperature greater than 250° Celsius.
5. The method for forming a stack according to claim 4 , further comprising depositing the platinum electrode using PVD with a working gas having an oxygen partial pressure of greater than 10 percent.
6. The method for forming a stack according to claim 1 , wherein depositing the platinum electrode comprises depositing a platinum electrode having a [111] crystal orientation.
7. The method for forming a stack according to claim 1 , further comprising depositing a second electrode over the titanium oxide layer to form a capacitor.
8. The method for forming a stack according to claim 7 , wherein the capacitor is part of a dynamic random access memory (DRAM) cell.
9. A method for forming a capacitor comprising:
depositing a platinum electrode on a substrate using physical vapor deposition (PVD) with a pedestal temperature of greater than 250° C. and a working gas having an oxygen partial pressure of greater than 10 percent;
treating the electrode using an oxygen plasma; and
depositing a titanium oxide layer on the electrode, wherein the titanium oxide layer is at least a portion rutile titanium oxide;
doping the titanium oxide layer with at least one of yttrium and aluminum.
10. The method for forming a capacitor according to claim 9 , further comprising annealing the capacitor using a rapid thermal oxidation (RTO) process of at least approximately 600° C.
11. The method for forming a capacitor according to claim 9 , further comprising:
depositing a second electrode over the metal oxide layer, wherein the second electrode is one of platinum and ruthenium, to form a capacitor structure.
12. The method for forming a capacitor according to claim 11 , wherein the capacitor structure comprises a dynamic random access memory (DRAM) cell.
13. The method for forming a capacitor according to claim 9 , wherein treating comprises using one of a high density plasma and an atmospheric plasma.
14. The method for forming a capacitor according to claim 9 , wherein the titanium oxide layer includes an X-ray diffraction peak associated with rutile titanium oxide.
15. The method for forming a capacitor according to claim 10 , wherein the pedestal temperature is between 250° and 300° C.
16. The method for forming a capacitor according to claim 10 , wherein the pedestal temperature is approximately 300° C.
17. The method for forming a capacitor according to claim 10 , wherein the oxygen partial pressure is greater than 20 percent.