Molecular beam epitaxy growth of Transition Metal Dichalcogenide (Mo,Mn)Se2 on 2D, 3D and polycrystalline substrates

Article abstract:

Magnetic doping of 2D materials such as Transition Metal Dichalcogenides is promising for enhancement of magneto-optical properties, as it was previously observed for 3D diluted magnetic semiconductors. To maximize the effect of magnetic ions, they should be incorporated into the crystal lattice of 2D material rather than form separated precipitates. This work shows study on incorporating magnetic manganese ions into the MoSe2 monolayers using molecular beam epitaxy. We test growth on various substrates with very different properties: polycrystalline SiO2 on Si, exfoliated 2D hexagonal Boron Nitride flakes (placed on SiO2/Si), monocrystalline sapphire, and exfoliated graphite (on tantalum foil). Although atomic force microscopy images indicate presence of MnSe precipitates, but at the same time, various techniques reveal effects related to alloying MoSe2 with Mn: Raman scattering and photoluminescence measurements shows energy shift related to presence of Mn, scanning transmission microscopy shows Mn induced partial transformation of 1H to 1T’ phase. Above effects evidence partial incorporation of Mn into MoSe2 layer.

Archive structure:

The .zip file has 8 folders named "Figure X" X=1-8. Each folder contains data from the corresponding figure subsequently, from 1 to 8. In every folder, one can find additionally a text file with measurement details and the necessary software to open data files (if needed). 

Files:

The majority of files are text files, that can be easily opened in any text editor. For opening special files there is a note with adequate software placed in the .zip file (next to the data).

Measurements:

1. PL / Raman spectroscopy - measurements were taken using flow cryostat, excitation wavelength 532 nm, and temperatures 10 K and room temperature (ap. 300 K) respectively for PL and RS.
2. Transmittance - was taken at room temperature employing a white light source.
3. AFM - apparatus by Bruker (model dimension icon) with ScanAsyst mode was used (with dedicated probe).