Zn,+Mg,Se mixed crystals were grown by the high-pressure Bridgman method in the x range 0.06 to 0.285. X-ray investigations show that with increasing Mg content the transition from a sphalerite structure to wurtzite occurs at x = 0.185 4 0.03. After annealing in liquid zinc or zinc vapour, investigated crystals exhibit n-type conductivity as well as blue-violet and orange photoluminescence in the temperature range from 40 K to room temperature.
COOAg (2) have been used as precursors for the CVD of silver layers in the temperature range 493±623 K. The thin films obtained were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), scanning tunneling electrochemical microscopy (STEM), X-ray photoelectron spectroscopy (XPS), and temperature variable infrared (IR) measurements. The SEM images of Ag films grown from 2 exhibited a surface with a grain size in the range 0.4±1.5 lm, whereas from 1 the size was~0.1 lm. This was confirmed by the STEM studies. The better stability of 1 in the vapor phase was proved by temperature variable IR spectra (373±523 K). Mass spectrometry (MS) images confirmed the presence of the monomeric and dimeric species, and the recombination ions transported in vapors. The XPS image analysis of the silver layers revealed the presence of some carbon impurities. The films demonstrated good adhesion to silicon substrates.
The structural and optical investigation of thin films containing aluminum and gallium phthalocyanine chlorides is presented. The films were fabricated by Physical Vapor Deposition technique onto quartz substrates and annealed after fabrication in an ambient atmosphere for 24 h at the temperature equal to 150 °C or 250 °C. The experimental results and theoretical calculation of the Third Harmonic Generation process are reported. The third order nonlinear optical properties are expected and can be more or less accurately predicted due to the assembly of the molecules and theoretical calculations of the frequency-dependent dipole polarizabilities, third hyperpolarizabilities, third order susceptibilities, frontier and second frontier molecular orbitals. These parameters were used to understand the relationship of optical properties with the molecular structures. We found that the annealing process causes formation of nanostructures and the value of the third order optical susceptibility makes these materials interesting for future nonlinear optical applications.
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