Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.9: Poster

Dienstag, 18. März 2025, 18:00–20:00, P1

Vibrational fingerprint of 2D transition-metal dichalcogenide WSe₂ — •Kanivar Türk, Bastian Thomßen, Gerhard Berth, and Klaus Jöns — PhoQS Institute, CeOPP and Department of Physics, Paderborn University, Paderborn, Germany

Thin-layered transition-metal dichalcogenides (TMDC) are on high demand in the material science community [1]. The advantages of monolayer configurations of these TMDCs include the transition from indirect to direct band gap, which leads to way superior properties when compared to bulk, like optical, electrical, magnetic, thermal and mechanical improvements [2].
In this work, exfoliated 2D flakes of WSe₂ have been produced and analysed in terms of their vibrational properties via Raman spectroscopy. Beside a comprehensive phonon mode assignment, a layer number specific analysis has been performed and compared to results from photoluminescence measurements.
[1] Saju Joseph et al.; Materials Chemistry and Physics 297: A review of the synthesis, properties, and applications of 2D transition metal dichalcogenides and their heterostructures (2023)
[2] Mingxiao Ye et al.; Photonics, 2: Recent Advancement on the Optical Properties of Two-Dimensional Molybdenum Disulfide (MoS₂) Thin Films (2015)

Keywords: 2D materials; WSe2; Transition metal dichalcogenides; optoelectronics and photonics; Raman