Thermochemical synthesis of tribotechnical coatings based on molybdenum diselenide MoSe2 on structural steels

The study results of the influence of parameters of the process of chemical-thermal treatment in selenium vapor during the preparation of solid lubricating coatings from molybdenum diselenide on specimens of structural steels with a plasma Mo-coating are presented. An empirical mathematical model of the temperature-time parameters of the Mo selenization process is proposed, which makes possible to control the quality of the obtained coatings depending on requirements for their tribotechnical properties. An assessment of their tribotechnical characteristics in air and in vacuum in the temperature range 20—600 °С has been carried out.

The synthesis of competing phase GeSe and GeSe2 2D layered materials

We report the synthesis of layered anisotropic semiconductor GeSe and GeSe2 nanomaterials through low temperature and atmospheric pressure chemical vapor deposition using halide based precursors. The crystal phase is controlled by simply changing selenium vapor pressure.

Повышение степени циркулярной поляризации спиновых светоизлучающих диодов путем обработки в парах селена

Spin light-emitting diodes based on InGaAs/GaAs heterostructures with a CoPt ferromagnetic injector were fabricated. It was demonstrated that the processing of these structures in selenium vapor prior to the deposition of a CoPt contact provides an opportunity to enhance the circular polarization degree of diode emission. The observed increase in the polarization degree is attributed to the suppression of spin relaxation at the metal/semiconductor interface due to surface passivation and a reduction in the density of surface electron states as a result of processing in selenium vapor.