Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.10: Poster

Tuesday, March 18, 2025, 18:00–20:00, P1

Tuning of excitonic emission of 2D-TMDs by hybridization with phase change materials — •Jakob Cornelius Wurschi, Martin Hafermann, Edwin Eobaldt, and Carsten Ronning — Institut für Festkörperphysik FSU Jena

Transition metal dichalcogenides (TMDs) are a subject of growing interest, given their wide range of potential applications, such as transistors or biosensors. Especially in the context of optoelectronic devices a precise tuning of the emission behaviour can be a powerful tool for the realisation of advanced technologies. To gain insight into potential tuning mechanisms of the excitonic emission of TMD monolayers, we investigate the hybridization of 2D MoS₂ and WS₂ flakes with germanium-antimony-telluride (GST). This compound system is capable of undergoing a phase transition between an amorphous and two crystalline states accompanied with drastic changes in the electrical and optical properties. Thermal heating triggers the phase transitions of GST, which we monitor by measuring the reflectivity of the GST thin films on silicon. After 2D-TMD flake exfoliation, in-situ measurements of the TMD photoluminescence spectra were obtained during or after the phase transitions of the GST substrate. With our approach, we observe a significant spectral shift of the excitonic emission of MoS₂ on GST/Si by precisely tuning the phase of the underlying GST. Further, for WS₂ flakes on gold substrates we observed a GST layer thickness dependent spectral shift for the excitonic emission of WS₂.

Keywords: Transition metal dichalcogenides; phase change material; excitons; tuning