We report on the effect of the substrate temperature on the growth dynamics and dielectric properties of BaTiO3 epitaxial films on Nb:SrTiO3 (001) substrates. By real-time reflection high energy electron diffraction analysis, we quantitatively estimated the adatoms surface diffusivity as a function of temperature. The increase of the substrate temperature promotes surface diffusion, which reflects in the improvement of BaTiO3 ferroelectric properties up to 680 C. Above this temperature, Ba re-evaporation occurs, leading to a rapid deterioration of the dielectric and ferroelectric properties. This work shed light on thermally activated physical mechanisms which determine the ferroelectric properties of BaTiO3 films.
Correlation between growth dynamics and dielectric properties of epitaxial BaTiO3 films
RADAELLI, GRETA;BRIVIO, STEFANO;BERTACCO, RICCARDO
2012-01-01
Abstract
We report on the effect of the substrate temperature on the growth dynamics and dielectric properties of BaTiO3 epitaxial films on Nb:SrTiO3 (001) substrates. By real-time reflection high energy electron diffraction analysis, we quantitatively estimated the adatoms surface diffusivity as a function of temperature. The increase of the substrate temperature promotes surface diffusion, which reflects in the improvement of BaTiO3 ferroelectric properties up to 680 C. Above this temperature, Ba re-evaporation occurs, leading to a rapid deterioration of the dielectric and ferroelectric properties. This work shed light on thermally activated physical mechanisms which determine the ferroelectric properties of BaTiO3 films.| File | Dimensione | Formato | |
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APL Radaelli 2012.pdf
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