Наукові роботи студентів, магістрів, аспірантів (ЕлІТ)
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Item Substructural Properties and Anisotropic Peak Broadening in Zn(1-x)MnxTe Films Determined by a Combined Methodology Based on SEM, HRTEM, XRD, and HRXRD(Springer, 2016) Martinez-Tomas, С.; Климов, Олексій Володимирович; Климов, Алексей Владимирович; Klymov, Oleksii Volodymyrovych; Agouram, S.; Курбатов, Денис Ігорович; Курбатов, Денис Игоревич; Kurbatov, Denys Ihorovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Muñoz-Sanjosé, V.Lattice deformation and extended defects such as grain boundaries and dislocations affect the crystalline quality of films and can dramatically change material’s properties. In particular, magnetic and optoelectronic properties depend strongly on these structural and substructural characteristics. In this paper, a combined methodology based on SEM, HRTEM, XRD, and HRXRD measurements is used to determine and assess the structural and substructural characteristics of films. This combined methodology has been applied to Zn1-xMnxTe films grown on glass substrates by close-spaced vacuum sublimation. Nevertheless the methodology can be applied to a wide variety of materials and could become a useful characterization method which would be particularly valuable in semiconductor growth field. The knowledge of the structural and substructural characteristics can allow not only the optimization of growth parameters, but also the selection of specific samples having the desired characteristics (crystallite size, minimum dislocation content, etc.) for high-quality technological devices.Item Surface Morphology, Structural and Optical Properties of MgO Films Obtained by Spray Pyrolysis Technique(Acta Physica Polonica A, 2016) Д`яченко, Олексій Вікторович; Дьяченко, Алексей Викторович; Diachenko, Oleksii Viktorovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Курбатов, Денис Ігорович; Курбатов, Денис Игоревич; Kurbatov, Denys Ihorovych; Опанасюк, Надія Миколаївна; Опанасюк, Надежда Николаевна; Opanasiuk, Nadiia Mykolaivna; Kononov, O.K.; Cheong, H.; Nam, D.X-ray diffraction, atomic force microscopy, field emission scanning electron microscopy, UV-visible photometry, and photoluminescence measurements were used to investigate the surface morphology and structural and optical properties of MgO films. Magnesium oxide films deposited by the spray pyrolysis technique were studied. The substrate temperature was varied from Ts = 643 K to 693 K. Magnesium chloride hexahydrate (MgCl2 .6H2O), dissolved in deionized water, was used as the precursor solution. It was established that the single phase films crystallize into a cubic structure with very fine crystallite size (about 2 nm). The optical band gaps of the samples were varied from 3.64 eV to 3.70 eV. Also, the films have a high level of transmittance of 90%. Photoluminescence spectra show the emission peaks at approximately 412 nm (3.00 eV) and 524 nm (2.38 eV). The peak with the energy of 3.00 eV is ascribed to holes trapped in magnesium ion vacancies acting as acceptors (F+ center). The broad emission peak at 524 nm is related to the presence of defects (F- centers) associated with oxygen ion vacancies.Item Luminescent and optical characteristics of Zinc Sulfide thin films produced by close-spaced vacuum sublimation(Romanian Academy published by Editura Academiei Romane, 2010) Курбатов, Денис Ігорович; Курбатов, Денис Игоревич; Kurbatov, Denys Ihorovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Кшнякіна, Світлана Іванівна; Кшнякина, Светлана Ивановна; Kshniakina, Svitlana Ivanivna; Мельник, В.; Мельник, В.; Mеlnik, V.; Несправа, В.; Несправа, В.; Nesprava, V.The luminescent and optical characteristics of ZnS thin films produced by close-spaced vacuum sublimation technique (CSVS) were investigated in this work. Luminescent and optical investigations allowed determining the fluorescence centers of native defects and uncontrolled impurities.Item Study of the structural and photoluminescence properties of CdTe polycrystalline films deposited by closed space vacuum sublimation(Elsevier, 2010) Косяк, Володимир Володимирович; Косяк, Владимир Владимирович; Kosiak, Volodymyr Volodymyrovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Bukivskyi, P.M.; Hnatenko, Y.P.The polycrystalline CdTe films were deposited by the close-spaced vacuum evaporation at the different substrate temperatures (150–550 °C). The X-ray diffraction measurements of structural and substructural properties of these films were carried out to study their phase composition and texture. The films’ parameters such as the coherent scattering domain size, microdeformation level and mean density of dislocations were determined based on the broadening of diffraction peaks. In this case the Hall and three-fold convolution approximations were used. Surface morphology, grain size and growth mechanism of the films were determined by the scanning electron microscopy. The low temperature photoluminescence measurements allowed us to establish the correlation between the point and extended defect structure on the one hand and the growth conditions on the other. As a result, the growth conditions of CdTe polycrystalline films with fairly good crystal and optical quality were determined.Item Characterization Cupper Oxide thin films(Львівський національний університет ім. Івана Франка, 2015) Д`яченко, Олексій Вікторович; Дьяченко, Алексей Викторович; Diachenko, Oleksii Viktorovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Nam, D.; Cheong, H.For obtaining of the CuO thin films have used spray pyrolysis method. Glass plates were cleaned in ultrasonic bath and washed with ethanol, used as a substrates. We used an aqueous solution of copper chloride (CuCl22H2O) with a concentration of 0.05 M as a precursor. The substrate temperature range from 570 to 720 K, with step Т=50 K. For atomization of precursor the air flow with a pressure of 0.25 MPa was used.Item Investigation of Optical Properties of Magnesium Oxide Films Obtained by Spray Pyrolysis Technique(Odessa I. I. Mechnikov National University, 2016) Д`яченко, Олексій Вікторович; Дьяченко, Алексей Викторович; Diachenko, Oleksii Viktorovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Курбатов, Денис Ігорович; Курбатов, Денис Игоревич; Kurbatov, Denys Ihorovych; Cheong, H.Today more and more areas of optoelectronics used oxide materials, as a result, their study, is very important . Therefore, in this paper, we study optical properties of magnesium oxide films. band gap, spray-pyrolysis, optoelectronics, optical properties.Item Raman spectroscopy of nanocrystalline Cu2ZnSnS4 thin films obtained by pulsed spray pyrolysis(Львівський національний університет ім. Івана Франка, 2015) Доброжан, Олександр Анатолійович; Доброжан, Александр Анатольевич; Dobrozhan, Oleksandr Anatoliiovych; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Cheong, H.; Nam, D.The sprayed CZTS thin films were deposited using an aqueous solution containing CuCl2·2H2O (0.02 M), ZnCl2 (0.01 M), SnCl2·2H2O (0.015 M) and SC(NH2)2 (0.1 M) at the temperature substrate of 400 0C with the different values of starting solution volume per sample (2 ml, 3 ml, 4 ml, 5 ml).Item Post-growth treatment of SnxSy thin films(E-MRS (European Materials Research Society), 2016) Косяк, Володимир Володимирович; Косяк, Владимир Владимирович; Kosiak, Volodymyr Volodymyrovych; Возний, Андрій Петрович; Возный, Андрей Петрович; Voznyi, Andrii Petrovych; Onufrijevs, P.; Grase, L.; Vecstaudža, J.; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Medvids, A.; Mezinskis, G.In this study, the effect of post-growth thermal annealing and laser irradiation on phase composition, structural, optical and electrical properties of SnS2 obtained by the close-spaced sublimation on ITO substrates was studied. It was found, by using EDS, XRD and Raman methods that as-grown samples have single phase SnS2 structure and their chemical composition is close to stoichiometric.