Phase transition and thermal stability of epitaxial PtSe nanolayer on Pt(111).

This work relates to direct synthesis of the two-dimensional (2D) transition metal dichalchogenide (TMD) PtSe using an original method based on chemical deposition during immersion of a Pt(111) surface into aqueous NaSe solution. Annealing of the sample induces significant modifications in the structural and electronic properties of the resulting PtSe film. We report systematic investigations of temperature dependent phase transitions by combining synchrotron based high-resolution X-ray photoemission (XPS), low temperature scanning tunnelling microscopy (LT-STM) and low energy electron diffraction (LEED).