Applied Physics Letters · 2005 · 41 citations · 19 references
EngineeringMaterials EngineeringMaterials ScienceElectronic MaterialsMaterials ChemistrySemiconductor DevicesMos CapacitorsSemiconductor InterfacesSemiconductor SurfacesSilicon MaterialsThin Film AnnealingX-ray Photoelectron SpectroscopyAnnealingAnnealing EffectsIsotopic Substitution EffectsIsotopic Substitution StudiesOxygen VacanciesPost-deposition AnnealingThermal AnnealingThermal Annealing Effects
LaAlO 3 films were deposited on p-type Si(100) by sputtering from a LaAlO3 target. C×V characteristics were determined in nonannealed and O2-annealed capacitors having LaAlO3 films as dielectric and RuO2 as top electrode. Thermal annealing in O2 atmosphere reduced flat band voltage to acceptable values for advanced Si-based devices. O16–O18 isotopic substitution was characterized by Rutherford backscattering spectrometry and nuclear resonant reaction profiling. Chemical analysis of the films was accomplished by x-ray photoelectron spectroscopy. The electrical improvements observed after thermal annealing in O2 were attributed to the incorporation of oxygen from the gas phase, possibly healing oxygen vacancies in the films and providing mobile oxygen to the interface.
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