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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.11: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster E

Optical characterization of non-magnetic 2D semiconductor MgPS3 and magnetic 2D semiconductor MnPS3 — •Thomas Kliewer¹, Pierre-Maurice Piel¹, Zdenek Sofer², and Ursula Wurstbauer¹ — ¹Institute of Physics, Muenster University, Germany — ²Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Prague, Czech Republic

The van-der-Waals (vdW) materials MnPS3 and MgPS3 are members of the metal phosphorus trichalgonides family (MPX3) which has recently gained interest due to its wide range of physical and chemical properties. MgPS3 is a possible photocatalyst for water-splitting reactions [1]. MnPS3 exhibits a ferromagnetic configuration between adjacent layers and an antiferromagnetic order in the layers [2] making it interesting for fundamental studies on magnetism in the 2D-limit.

Here we report on photoluminescence (PL)- and non-resonant Raman-spectroscopy investigations to characterize the optical and vibrational properties of both materials. To probe the impact of magnetic ordering, MnPS3 has been studied as function of temperature across the Néel-temperature.

For below-band gag excitation we find emission signatures in MnPS3 suggesting the existence of optically active in-gap states most likely due to defects. The Raman spectra of MnPS3 show the expected Raman active phonon modes. For MgPS3 the Raman-spectra show large intensity variations between different samples with different thickness.

[1] Jan Paštika et al. Small 18.18 (2022), p. 2200355 [2] Ko Kurosawa et al. J. Phys. Soc. Jpn. 52 (1983), pp. 3919-3926

Keywords: MnPS3; FePS3; Raman spectroscopy; Photoluminiscecne spectroscopy