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Disorder plays an essential role in shaping the transport properties of GeSbTe phase-change materials (PCMs) to enable nonvolatile memory technology. Recently, increasing efforts have been undertaken to investigate disorder in the stable hexagonal phase of GeSbTe compounds, focusing on a special type of swapping bilayer defects. This configuration has been claimed to be the key element for a new mechanism for phase-change memory. Here, we report a direct atomic-scale chemical identification of these swapping bilayer defects in hexagonal GeSb2Te4 together with nanoscale atomic modeling and simulations. We identify the intermixing of Sb and Te in the bilayer to be the essential ingredient for the stability of the defects, and elucidate their abundance as due to the small energy cost. The bilayer defects are demonstrated to be ineffective in altering the electron localization nature that is relevant to …
American Chemical Society
Publication date: 
2 Jul 2018

Jiang-Jing Wang, Jun Wang, Hongchu Du, Lu Lu, Peter C Schmitz, Johannes Reindl, Antonio M Mio, Chun-Lin Jia, Evan Ma, Riccardo Mazzarello, Matthias Wuttig, Wei Zhang

Biblio References: 
Volume: 30 Issue: 14 Pages: 4770-4777
Chemistry of Materials