SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 16: Thermoelectric and Phase Change Materials; Layer Deposition
DS 16.5: Vortrag
Donnerstag, 30. März 2023, 12:30–12:45, SCH A 315
Interplay of Glass Dynamics and Crystallization Kinetics of Photonic Phase Change Materials Sb2S3 & Sb2Se3 — •Felix Hoff1, Julian Pries1, Maximilian J. Müller1, Eric N. Lensker1, and Matthias Wuttig1,2,3 — 1I. Institute of Physics (IA), RWTH Aachen University — 2Jülich-Aachen Research Alliance (JARA FIT and JARA HPC) — 3PGI 10 (Green IT), Forschungszentrum Jülich GmbH
Due to their large bandgaps, the chalcogenide phase-change materials (PCM) antimony sulfide Sb2S3 and antimony selenide Sb2Se3 are interesting for photonic applications in the visible and telecommunication wavelength range. They are promising for photonic integrated circuits or tunable metasurfaces. While recent literature focuses on the optical properties and the resulting applications, a systematic quantification of the amorphous glass phase, as well as its influence on the process of crystallization under different conditions, is missing. In this work, both the standard glass transition and fragility of antimony sulfide are presented and discussed. Sb2S3 is found to crystallize from the undercooled liquid phase for all technologically relevant heating rates spanning over six orders of magnitude. In contrast, Sb2Se3 appears to show a glass transition only for higher heating rates. This can be used to explain the unusual temperature dependence of its crystallization mechanism in thin films.