What is real mechanism (at atomic level) behind Phase change Switching in Ge-Sb-Te based chalcogenide alloys ?

19 August 2022 1 5K Report

Ge-Sb-Te-based chalcogenide materials change their phase from crystalline to amorphous when exposed to ultrashort heat pulse. What happens to the atomic state level that these materials show such properties? In other words, how can I explain this mechanism simple and lucid way to a person from a different field of research?

Why is this switching not happening in other covalent bonded materials like Silicon?

If we consider its resonant bonding as an explanation, many carbon compounds are covalently bonded and have resonant bonding, then why are they not showing such properties?

If we consider the delocalization of charge carriers in the crystalline state, which ultimately enhances the optical properties, then how does this theory explain the significant contrast in electrical resistance

The no of charge carriers (order) in the amorphous and crystalline states are quite similar, and the bandgap is very close to each other. What is the real origin of such a considerable change in resistance upon structural change?

Mohammad Pourmand

In my little understanding, the optical properties have been affected by atomic orders. In phase change mediums such as water and GST, the permittivity is modified slightly by atoms' arrangement. The following reference has discussed this matter.

M. Delaney, I. Zeimpekis, D. Lawson, D. W. Hewak, and O. L. Muskens, “A New Family of Ultralow Loss Reversible Phase-Change Materials for Photonic Integrated Circuits: Sb2S3 and Sb2Se3,” Advanced Functional Materials, vol. 30, no. 36, p. 2002447, 2020, doi: https://doi.org/10.1002/adfm.202002447.

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