Persons

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Depending on the choice of technology for manufacturing the CuIn GaSe films the scattering of electrical-and photoelectrical of the photo converters parameters is observed, which in the first turn is related to the microstructure formed in the films and their phase composition. The study on the phase division processes and the formation of the one-phase film CuIn GaSe is the key moment in manufacturing high quality absorbing layers. Thin films of CuInGaSe have been prepared by the two-step selenization of the preliminary synthesized Cu-In-Ga- layers of different thickness in a temperature interval 350 ≤ T ≤ 550 °C. The surface morphology, the chemical composition and the structure of the synthesized CuInGaSe films have been studied using the electron microscopy, the X-ray powder diffraction and the X-ray fluorescence methods. It has been determined that the synthesized films are polycrystalline, have developed surface and the crystalline medium size of 50-140 nm. The minimum initial selenization temperature and the minimum thickness of the metal layer, required to prepare CuInGaSe thin film, have been defined from the statistical analysis of the electron microscopy data.

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The control of the nanomaterials surface’s hydrophilic properties is of interest for various applications, including optics, photocatalysis, and spintronics. In this work, techniques for designing the defective structure of the surface layers of faceted zinc oxide nanorods during sacrificial doping with iodine by hydrothermal synthesis were considered. The features of the chemical composition of the surface of the obtained layers were studied using X-ray photoelectron spectroscopy (XPS). It was found that peaks corresponding to the binding energy of iodine were not observed in the X-ray photoelectron spectra. An additional peak with a binding energy of 531.8 eV, corresponding to the oxygen of OH groups, was observed in the O 1 s level spectrum for zinc oxide nanorods doped with iodine. During the heat treatment of the synthesized layers, iodine evaporates, which leads to a change in the surface composition and an increase in the oxygen content of the surface hydroxyl groups. A model has been proposed to explain the experimental results. It has been established that XPS techniques are effective for analyzing the defective surface structure of functional layers based on faceted zinc oxide nanorods.

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