Morphology and microstructure of BaTiO3/SrTiO3 superlattices grown on SrTiO3 by laser molecular-beam epitaxy

作者: N. Wang , H. B. Lu , W. Z. Chen , T. Zhao , F. Chen

DOI: 10.1063/1.125297

关键词: High-resolution transmission electron microscopySuperlatticeCrystallographyEpitaxyPulsed laser depositionOptoelectronicsTransmission electron microscopyMaterials scienceMolecular beam epitaxyElectron diffractionThin film

摘要: The morphology and microstructure of BaTiO3/SrTiO3 (BTO/STO) superlattices grown epitaxially on STO (001) substrates by a computer-controlled laser molecular-beam epitaxy deposition system have been characterized means atomic force microscopy high-resolution transmission electron (HRTEM). It is found that the HRTEM images taken along [120] direction BTO show maximal contrast difference. is, therefore, observed consist highly oriented single-crystalline multilayered structure. As identified HRTEM, number unit cells in each or layer matches very well with obtained from reflection high-energy diffraction oscillations. surfaces interfaces are atomically smooth. In superlattices, ratio between c axis about 4% larger than measured bulk crystals.

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