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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Growth of nanoscale BaTiO3/SMO3 superlattices by molecular-beam epitaxy

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Title
Growth of nanoscale BaTiO3/SMO3 superlattices by molecular-beam epitaxy
Author
Soukiassian, A.Tian, W.Vaithyanathan, V.Haeni, J. H.Chen, L. Q.Xi, X. X.Schlom, D. G.Tenne, D. ASun, H. P.Pan, X. Q.Choi, Kyoung JinEom, C. B.Li, Y. L.Jia, Q. X.Constantin, C.Feenstra, R. M.Bernhagen, M.Reiche, P.Uecker, R.
Keywords
THIN-FILMS; SRTIO3; FERROELECTRICITY; ENHANCEMENT; FABRICATION; DIELECTRICS; SURFACE
Issue Date
2008-05
Publisher
CAMBRIDGE UNIV PRESS
Citation
JOURNAL OF MATERIALS RESEARCH, v.23, no.5, pp.1417 - 1432
Abstract
Commensurate BaTiO3/SrTiO3 superlattices were grown by reactive molecular-beam epitaxy on four different substrates: TiO2-terminated (001) SrTiO3, (101) DyScO3, (101) GdScO3, and (101) SmScO3. With the aid of reflection high-energy electron diffraction (RHEED), precise single-monolayer doses of BaO, SrO, and TiO2 were deposited sequentially to create commensurate BaTiO3/ SrTiO3 superlattices with a variety of periodicities. X-ray diffraction (XRD) measurements exhibit clear superlattice peaks at the expected positions. The rocking curve full width half-maximum of the soperlattices was as narrow as 7 arc s (0.002°). High-resolution transmission electron microscopy reveals nearly atomically abrupt interfaces. Temperature-dependent ultraviolet Raman and XRD were used to reveal the paraelectric-to-ferroeleotric transition temperature (TC). Our results demonstrate the importance of finite size and strain effects on the TC of BaTiO3/ SrTiO3 superlattices. In addition to probing finite size and strain effects, these heterostructures may be relevant: for novel phooon devices, including mirrors, filters, and cavities for coherent phonon generation and control.
URI
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DOI
10.1557/jmr.2008.0181
ISSN
0884-2914
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MSE_Journal Papers
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