Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.6: Poster

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

Raman and photoluminescence spectroscopy on differently synthesised MoSe₂ — •Lara Blinov¹, Hendrik Lambers¹, Zdeněk Sofer², and Ursula Wurstbauer¹ — ¹Institute of Physics, University of Münster, Münster, Germany — ²Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Prague, Czech Republic

There are various synthesis methods for the widely researched transition metal dichalcogenides (TMDCs). We examine optical responses of MoSe₂ synthesised by chemical vapor transport (CVT) with different halogen contributions in the transport gas. Therefore, mono- and bilayers of those differently grown parental crystals are mechanically exfoliated and investigated by Raman and photoluminescence (PL) spectroscopy at room temperature as well as in temperature-dependent PL measurements.

We analyse and compare the energies and intensities corresponding to the neutral A and B excitons as well as a prominent A⁻ trion in the PL spectra and the frequency of the first order Raman modes. We conclude that the CVT synthesised crystals seem to have an inhomogeneous distribution of charge carrier densities or defects and that the defect density seems to be larger than in conventionally synthesised MoSe₂.

Keywords: MoSe2; CVT growth; Raman spectroscopy; Photoluminescence spectroscopy