Patrick Ponath, Andrew O'Hara, et al.
Physical Review B
Atomic layer deposition (ALD) of epitaxial c-axis oriented BaTiO 3 (BTO) on Si(001) using a thin (1.6 nm) buffer layer of SrTiO 3 (STO) grown by molecular beam epitaxy is reported. The ALD growth of crystalline BTO films at 225 C used barium bis(triisopropylcyclopentadienyl), titanium tetraisopropoxide, and water as co-reactants. X-ray diffraction (XRD) reveals a high degree of crystallinity and c-axis orientation of as-deposited BTO films. Crystallinity is improved after vacuum annealing at 600 C. Two-dimensional XRD confirms the tetragonal structure and orientation of 7-20-nm thick films. The effect of the annealing process on the BTO structure is discussed. A clean STO/Si interface is found using in-situ X-ray photoelectron spectroscopy and confirmed by cross-sectional scanning transmission electron microscopy. The capacitance-voltage characteristics of 7-20 nm-thick BTO films are examined and show an effective dielectric constant of ∼660 for the heterostructure. © 2014 AIP Publishing LLC.
Patrick Ponath, Andrew O'Hara, et al.
Physical Review B
Thong Q. Ngo, Nicholas J. Goble, et al.
Journal of Applied Physics
Thong Q. Ngo, Agham Posadas, et al.
Journal of Crystal Growth
Miri Choi, Agham B. Posadas, et al.
Journal of Applied Physics