SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Thin Film Properties (joint session DS/KFM)
KFM 5.4: Vortrag
Dienstag, 28. März 2023, 10:45–11:00, SCH A 315
Exploring transition-metal substitution in FeSe2 thin films formed by seleniation at various temperatures — •Luqman Mustafa1, Andreas Kreyssig1, Jill Fortmann2, Aurelija Mockute2, Alan Savan2, Alfred Ludwig2, and Anna E. Böhmer1 — 1Institute for Experimental Physics IV, Ruhr-Universität Bochum, Germany — 2Materials Discovery and Interfaces, Institute for Materials, Ruhr University Bochum, Germany
Transition-metal dichalcogenides with orthorhombic marcasite structure have been extensively studied for their applications in light energy conversion and photoelectrochemical devices. Lately this structure type has also gained interest for its magnetic properties as a candidate for the newly-predicted altermagnetic order.
Using combinatorial deposition and ex-situ selenization at 250∘C, 350∘C and 430∘C, we have studied the substitution of iron with different TMs in (Fe,X)Se2 thin films, (X= Co, Ni, Cr). This technique allowed to efficiently and quickly explore the possible ranges of substitution of TMs in this compound. We find that the marcasite structure of (Fe,Co)Se2 forms with higher Co content when the selenization temperature is lower.
Our results represent an example for the agility of combinatorial deposition of thin films in exploring the phase diagrams of transition-metal dichalcogenides. It may be adapted for other systems, such as FeSb2, and is therefore a unique tool to study a broad material family and its possible substitution ranges.