Patent ID: 7735206

Claim:
A method for forming a capacitor dielectric, the method comprising: depositing a zirconium oxide layer over a substrate; performing a post-treatment on the zirconium oxide layer such that the zirconium oxide layer has a tetragonal phase; and depositing a tantalum oxide layer over the zirconium oxide layer such that the tantalum oxide layer has a tetragonal phase, wherein depositing the zirconium oxide layer and depositing the tantalum oxide layer are performed using an atomic layer deposition process, wherein the atomic layer deposition process of the zirconium oxide layer is performed by repeating a first unit deposition cycle until the zirconium oxide layer has a thickness ranging from approximately 40 Å to approximately 100 Å, the first unit deposition cycle comprising introducing a zirconium source, introducing a first purge gas, introducing a first reactant, and introducing a second purge gas.