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- W2547211268 abstract "Preparation of epitaxial Ge-Sb-Te (GST) thin films with heterogeneous vacancy structures is of special interest for data storage applications such as non-volatile random access memory. In this work, epitaxial Ge2Sb2Te5 (GST225) thin films grown on Si(111) using pulsed laser deposition technique are reported. Structure analysis utilizing X-ray diffraction and high-resolution aberration-corrected scanning transmission electron microscopy revealed that the as-deposited GST225 films consist of both the cubic (c-GST225) and trigonal (t-GST225) phase. As-grown c-GST225 films exhibit crystalline grains with randomly distributed vacancies (cubic phase I) and with highly-ordered vacancy layers (cubic phase II). The formation of pure epitaxial t-GST225 films with micrometer grain size was achieved by post-annealing of as-grown GST225 films. The GST225 growth is initialized by the formation of a surface passivation Sb/Te layer on the Si(111) substrate surface. The layer is van-der-Waals bonded to the adjacent Te layer of a GST building block. The results of this work shed new insight into the crystal structure of the cubic modifications of the GST225 phase and may promote a better understanding of the switching mechanism of phase change materials as well as they might be beneficial for the future application in multi-level data storage." @default.
- W2547211268 created "2016-11-11" @default.
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- W2547211268 date "2017-02-01" @default.
- W2547211268 modified "2023-10-03" @default.
- W2547211268 title "Epitaxial formation of cubic and trigonal Ge-Sb-Te thin films with heterogeneous vacancy structures" @default.
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- W2547211268 doi "https://doi.org/10.1016/j.matdes.2016.11.003" @default.
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