Serednytski A. Structure and optical properties of nitride thin films and zinc oxide nanopowder, obtained by means laser ablation.

The dissertation is devoted to investigation of the structure and optical properties of thin nitride layers and ZnO nanopowders, obtained by means of pulsed laser ablation in chemically active environment.Using pulsed laser and laser-magnetron reactive technologies synthesized thin nitride layers GaN, AlN. Established the regularities the relationship between the thermodynamic parameters of the chemically active environment (nitrogen pressure, the substrate temperature), the energy-time regime and the geometry of laser deposition, on the one hand, and the structure and characteristics of the obtained luminescent thin nitride layers on the other side. Detected high reactivity laser plasma in quasiclosed volume and found that the processes that take place on the target surface (Ga, Al) lead to formation on the surface layer wurtzite phase. All epitaxial layers are thin GaN, AlN exhibit bright luminescence in regions: the 440-460 nm (AlN, GaN: Cr), 520 nm (GaN: Zn), 720 nm (GaN: Cr). Found that by laser annealing GaN: Cr can make changes in the emission spectra by acting on the activation centers of chromium.