Skip to Main content Skip to Navigation
Journal articles

The effect of Ge content on structural evolution of Ge-rich GeSbTe alloys at increasing temperature

Abstract : The material engineering of GeSbTe alloys has led to the significant improvements of thermal stability, necessary to ensure the data retention of the Phase-Change Memory device (PCM) over extended temperature range. However, despite the proven benefits of Ge enrichment of GeSbTe alloys, the effect of Ge content on the structure and its evolution as a function of annealing temperature remains unclear. In this paper, we present the structural analyses of as-deposited and annealed Ge-rich GeSbTe, considering the Ge enrichment (15-55 at. %) of Ge2Sb2Te5 reference alloy. Based on the combination of Raman spectroscopy and X-ray diffraction techniques, we describe the progressive reorganization of the main structural features common to all investigated compositions. Therefore, we present a model describing the overall crystallization dynamics in Ge-rich GeSbTe. We highlight several competing phenomena in the system at increasing temperature, such as Ge diffusion and segregation as well as nucleation and growth of GeSbTe and Ge phases, which depends on Ge content. Our results contribute to the understanding of the crystallization mechanisms in Ge-rich GeSbTe alloys, unveiling the primary structural reorganization and crystallization of the GeSbTe phase followed by the crystallization of the Ge phase.
Document type :
Journal articles
Complete list of metadata

https://hal-cea.archives-ouvertes.fr/cea-03707308
Contributor : Gabriele Navarro Connect in order to contact the contributor
Submitted on : Tuesday, June 28, 2022 - 2:51:17 PM
Last modification on : Tuesday, June 28, 2022 - 4:32:56 PM

File

GexGST paper1.8.pdf
Files produced by the author(s)

Identifiers

Collections

CEA

Citation

L Prazakova, E Nolot, E Martinez, D Rouchon, F Fillot, et al.. The effect of Ge content on structural evolution of Ge-rich GeSbTe alloys at increasing temperature. Materialia, Elsevier, 2022, 21, ⟨10.1016/j.mtla.2022.101345⟩. ⟨cea-03707308⟩

Share

Metrics

Record views

7

Files downloads

31