A unified mid-gap defect model for amorphous GeTe phase change material

A zero density change phase change memory material: GeTe-O structural characteristics upon crystallisation

Oxygen-doped germanium telluride phase change materials are proposed for high temperature applications. Up to 8 at.% oxygen is readily incorporated into GeTe, causing an increased crystallisation temperature and activation energy. The rhombohedral structure of the GeTe crystal is preserved in the oxygen doped films. For higher oxygen concentrations the material is found to phase separate into G...

Crystallization study of “melt quenched” amorphous GeTe by transmission electron microscopy for phase change memory applications

Universite Paris - Sud 11 École

Phase change materials combine a pronounced contrast in resistivity and reflectivity between their disordered amorphous and ordered crystalline state with very fast crystallization kinetics. Typical phase-change alloys are composed out of the elements germanium, antimony and tellurium. Due to the exceptional combination of properties phase-change materials find already broad application in non-...

Ultrafast characterization of phase-change material crystallization properties in the melt-quenched amorphous phase.

Phase change materials are widely considered for application in nonvolatile memories because of their ability to achieve phase transformation in the nanosecond time scale. However, the knowledge of fast crystallization dynamics in these materials is limited because of the lack of fast and accurate temperature control methods. In this work, we have developed an experimental methodology that enab...

A Model of Material with Phase Change and Applications

The macroscopic model of solid-solid phase change presented makes use of internal variables to represent the phase fractions and the local strains. As such, it can be cast in the framework of standard materials with internal constraints. These constraints are accounted for by Lagrange's multipliers. Reversible or irreversible phase changes are considered in a general way. Material stability is ...