Local structure of [(GeTe)(2)/(Sb2Te3)(m)](n)super-lattices by x-ray absorption spectroscopy
| Autor: | Philippe Kowalczyk, Francesco d'Acapito, C. Sabbione, Jean-Yves Raty, Pierre Noé, Françoise Hippert |
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| Přispěvatelé: | Laboratoire des matériaux et du génie physique (LMGP ), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA) |
| Jazyk: | Creoles and pidgins, English based |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Absorption spectroscopy Chalcogenide Superlattice Ab initio 02 engineering and technology x-ray absorption spectroscopy 01 natural sciences Molecular physics Spectral line lisa chemistry.chemical_compound chalcogenide 0103 physical sciences super-lattice Thin film ComputingMilieux_MISCELLANEOUS 010302 applied physics X-ray absorption spectroscopy interfacial phase-change memory Extended X-ray absorption fine structure [CHIM.MATE]Chemical Sciences/Material chemistry GeTe 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry extended x-ray absorption fine structure 0210 nano-technology Sb2Te3 |
| Zdroj: | Journal of physics. D, Applied physics 53 (2020). doi:10.1088/1361-6463/ab98c1 info:cnr-pdr/source/autori:D'Acapito, F.; Kowalczyk, P.; Raty, J-Y; Sabbione, C.; Hippert, F.; Noe, P./titolo:Local structure of [(GeTe)(2)%2F(Sb2Te3)(m)](n)super-lattices by x-ray absorption spectroscopy/doi:10.1088%2F1361-6463%2Fab98c1/rivista:Journal of physics. D, Applied physics (Print)/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume:53 Journal of Physics D: Applied Physics Journal of Physics D: Applied Physics, IOP Publishing, 2020, 53 (40), pp.404002. ⟨10.1088/1361-6463/ab98c1⟩ |
| ISSN: | 0022-3727 1361-6463 |
| Popis: | Herein, the local structure of [(GeTe)(2)/(Sb2Te3)(m)](n)chalcogenide super-lattices (SLs), which are at the basis of emerging interfacial Phase-Change Memory (iPCM), is studied by x-ray absoprtion spectroscopy at the Ge-K edge. The quantitative analysis of the first coordination shells reveals that the SLs possess a structure very similar to that of thin film of the canonical Ge2Sb2Te5(GST225) phase-change alloy. By comparing experimental data withab initiomolecular dynamics simulations of the extended x-ray absorption fine structure spectra, we show that chemical disorder is mandatory in order to reproduce the experimental data in the full spectral range. As a result, we can unambiguously conclude that Ge/Sb intermixing resulting from inter-diffusion of the GeTe and Sb(2)Te(3)layers within SLs is inherent to SLs and is not induced by sample preparation method nor by interaction with the electron beam of electron microscopes used in all the previous studies that were suggesting such a phenomenon. We further evidence that the short Ge-Te distance is the same in GeTe and GST225 films, as well as in SLs. The main difference is the impact of disorder in GST225 and SLs. Intermixing being definitively present in [(GeTe)(2)/(Sb2Te3)(m)](n)SLs, this parameter must be considered in future models aiming at going further in the understanding and the development of iPCM technology. This seems mandatory in order to allow such technology to emerge in the near future on the non-volatile memory market. |
| Databáze: | OpenAIRE |
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