Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 23: Optical Analysis of Thin Films (Reflection, Ellipsometry, Raman, IR-DUV Spectroscopy, ...)
DS 23.5: Vortrag
Donnerstag, 8. September 2022, 11:45–12:00, H14
Chalcogenides for Photonic Applications in the Visible — •Felix Hoff1, Carl-Friedrich Schoen1, Maximilian Mueller1, Yiming Zhou1, Peter Kerres1, Häser Maria1, and Matthias Wuttig1,2,3 — 1I. Institute of Physics (IA), RWTH Aachen University — 2Juelich-Aachen Research Alliance (JARA FIT and JARA HPC) — 3PGI 10 (Green IT), Forschungszentrum Juelich GmbH
Due to its large bandgap, the chalcogenide phase-change material (PCM) Sb2S3 is interesting for photonic applications, such as photonic switches in the visible range. Recent publications report contradictory findings concerning the switching speed. Since this property is decisive for many applications, it is important to better understand the crystallization process. To understand glass dynamics and crystallization kinetics, calorimetric measurements were performed. In addition, the optical properties were measured by optical spectroscopy and Ellipsometry. Supporting density functional theory (DFT) calculations are used and a comparison with typical PCMs is made. Sb2S3 has significant optical contrast in the visible spectral range, but lower maximum contrast than typical PCMs. It has been shown that crystallization takes significantly longer and has a broader stochastic distribution than for typical PCMs. Furthermore, crystallization occurs from the undercooled liquid phase for a range of heating rates which span over six orders of magnitude, so the glass transition could be studied. Our observations can be explained by the covalent bonding of Sb2S3. They can be understood in the context of a quantum mechanical map, which can be utilized to design materials for photonic applications.