Crystal growth of Ge2Sb2Te5 at high temperatures

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Abstract

Phase-change materials (PCMs) have important applications in optical and electronic storage devices. Ge2Sb2Te5 (GST) is a prototypical phase-change material (PCM) employed in state-of-the-art storage-class memories. In this work, we investigate crystallization of GST at temperatures 600-800 K by ab initio molecular dynamics. We consider large models containing 900 atoms, which enable us to investigate finite-size effects by comparison with smaller models. We use the metadynamics method to accelerate the formation of a large nucleus and then study the growth of the nucleus by unbiased simulations. The calculated crystal growth speed and its temperature-dependent behavior are in line with recent experimental work.

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Ronneberger, I., Zhang, W., & Mazzarello, R. (2018). Crystal growth of Ge2Sb2Te5 at high temperatures. MRS Communications, 8(3), 1018–1023. https://doi.org/10.1557/mrc.2018.131

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