@Article{FornariRappMoreAbra:2016:StPrBi,
author = "Fornari, Celso Israel and Rappl, Paulo Henrique de Oliveira and
Morelh{\~a}o, S{\'e}rgio L. and Abramof, Eduardo",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade de
S{\~a}o Paulo (USP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Structural properties of Bi2Te3 topological insulator thin films
grown by molecular beam epitaxy on (111) BaF2 substrates",
journal = "Journal of Applied Physics",
year = "2016",
volume = "119",
number = "16",
pages = "165303",
month = "Apr.",
abstract = "Structural properties of topological insulator bismuth telluride
films grown epitaxially on (111) BaF2 with a fixed Bi2Te3 beam
flux were systematically investigated as a function of substrate
temperature and additional Te flux. A layer-by-layer growth mode
is observed since the early stages of epitaxy and remains
throughout the whole deposition. Composition of the epitaxial
films produced here stays between Bi2Te3 and Bi4Te5, as determined
from the comparison of the measured x-ray diffraction curves with
calculations. The substrate temperature region, where the growth
rate remains constant, is found to be the most appropriate to
obtain ordered Bi2Te3 films. Line width of the L = 18 Bi2Te3
diffraction peaks as low as 140 arcsec was obtained, indicating
high crystalline quality. Twinning domains density rises with
increasing growth temperature and reducing Te extra flux. X-ray
reflectivity curves of pure Bi2Te3 films with thickness from 165
to 8 nm exhibited well defined interference fringes, evidencing
homogeneous layers with smooth surface. Our results demonstrate
that Bi2Te3 films with very well controlled structural parameters
can be obtained. High structural quality Bi2Te3 films as thin as
only eight quintuple layers grown here are promising candidates
for intrinsic topological insulator.",
doi = "10.1063/1.4947266",
url = "http://dx.doi.org/10.1063/1.4947266",
issn = "0021-8979",
language = "en",
targetfile = "fornari_structural.pdf",
urlaccessdate = "27 abr. 2024"
}