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Article Dans Une Revue physica status solidi (RRL) - Rapid Research Letters Année : 2024

Atomic Structure and Dynamics of Unusual and Wide‐Gap Phase‐Change Chalcogenides: A GeTe 2 Case

Résumé

Brain‐inspired computing, reconfigurable optical metamaterials, photonic tensor cores, and many other advanced applications require next‐generation phase‐change materials (PCMs) with better energy efficiency and a wider thermal and spectral range for reliable operations. Germanium ditelluride (GeTe 2 ), with higher thermal stability and a larger bandgap compared to current benchmark PCMs, appears promising for THz metasurfaces and the controlled crystallization of atomically thin 2D materials. Using high‐energy X‐Ray diffraction supported by first‐principles simulation, the atomic structure in semiconducting pulsed laser deposition films and metallic high‐temperature liquids is investigated. The results suggest that the structural and chemical metastability of GeTe 2 , leading to disproportionation into GeTe and Te, is related to high internal pressure during a semiconductor–metal transition, presumably occurring in the supercooled melt. Similar phenomena are expected for canonical GeS 2 and GeSe 2 under high temperatures and pressures.
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Origine : Publication financée par une institution
Licence : CC BY - Paternité

Dates et versions

hal-04443961 , version 1 (07-02-2024)

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Citer

Takeshi Usuki, Chris Benmore, Andrey Tverjanovich, Sergei Bereznev, Maxim Khomenko, et al.. Atomic Structure and Dynamics of Unusual and Wide‐Gap Phase‐Change Chalcogenides: A GeTe 2 Case. physica status solidi (RRL) - Rapid Research Letters, 2024, pp.2300482. ⟨10.1002/pssr.202300482⟩. ⟨hal-04443961⟩
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