Наукові роботи студентів, магістрів, аспірантів (ЕлІТ)
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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 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 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).