Видання зареєстровані авторами шляхом самоархівування
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Item Effect of Different Selenium Precursors on Structural Characteristics and Chemical Composition of Cu2ZnSnSe4 Nanocrystals(Institute of Physics Polish Academy of Sciences, 2022) Кахерський, Станіслав Ігорович; Кахерський, Станислав Игоревич; Kakherskyi, Stanislav Ihorovych; Pshenychnyi, R.; Доброжан, Олександр Анатолійович; Доброжан, Александр Анатольевич; Dobrozhan, Oleksandr Anatoliiovych; Vaziev, J.; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii Serhiiovych; Gnatenko, Y.In this work, Cu2ZnSnSe4 nanocrystals were synthesized by the polyol method. The chemical composition and morphological, structural, and microstructural properties of Cu2ZnSnSe4 nanocrystals, depending on the synthesis temperature and time, as well as the composition of the precursor, have been thoroughly investigated using scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, FTIR spectroscopy, Raman spectrometry, and low-temperature photoluminescence. We compared the properties of nanocrystals synthesized from different precursors containing selenourea or amorphous selenium as a source of selenium and then determined the optimal conditions for the synthesis of nanocrystals. It was found that the optimal synthesis time for nanocrystals obtained in the first approach is τ = 30–45 min, and in the second approach — τ = 120 min. It was also found that the optimal composition for the synthesis of single-phase Cu2ZnSnSe4 nanocrystals in the second approach is the molar ratio of precursors 2:1.5:1:4, and the synthesis temperature T = 280◦C. Thus, Cu2ZnSnSe4 nanocrystals synthesized under optimal conditions are used to develop nanoinks for printing solar cell absorbers by two- and three-dimensional printers.Item Structural and Optical Properties of CuO Thin Films Synthesized Using Spray Pyrolysis Method(MDPI, 2021) Д'яченко, Олексій Вікторович; Дьяченко, Алексей Викторович; Diachenko, Oleksii Viktorovych; Kováˇc, Jr.; Доброжан, Олександр Анатолійович; Доброжан, Александр Анатольевич; Dobrozhan, Oleksandr Anatoliiovych; Novák, P.; Kováˇc, J.; Skriniarova, J.; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii SerhiiovychCopper oxide thin films were obtained using pulsating spray pyrolysis method. The morphological, structural, and optical properties of fabricated films were studied. X-ray analysis revealed that the CuO thin films are single-phase. The study of films morphology by SEM and AFM methods showed that the obtained films have a fairly high surface roughness and contain grains of different shapes and sizes. It was found that the obtained films of copper oxide have high values of the absorption coefficient, which confirms the possibility of their use as absorbing layers for solar cells. The obtained values of the optical band gap of the material are in the range from 1.45 eV to 1.60 eV. Raman spectroscopy revealed three modes A1g, B1g, and B2g, of the crystal structure of monoclinic CuO. The devices based on p-type copper oxide are promising for solar cells fabrication because they can reduce production costs, due to their low cost and inexpensive production methods compared to silicon solar cells fabrication.Item Infuence of the thermal annealing on the morphological and structural propertie(Springer Nature, 2020) Доброжан, Олександр Анатолійович; Доброжан, Александр Анатольевич; Dobrozhan, Oleksandr Anatoliiovych; Пшеничний, Роман Миколайович; Пшеничный, Роман Николаевич; Pshenychnyi, Roman Mykolaiovych; Vorobiov, S.; Курбатов, Денис Ігорович; Курбатов, Денис Игоревич; Kurbatov, Denys Ihorovych; Komanicky, V.; Опанасюк, Анатолій Сергійович; Опанасюк, Анатолий Сергеевич; Opanasiuk, Anatolii SerhiiovychIn this work, ZnO flms were deposited onto fexible polyimide substrates by ink-jet printing nanoinks containing polyolsynthesized nanocrystals. ZnO flms were annealed at 200–400 °C for 10 min and 60 min under the ambient atmosphere. The morphological (shape, size, size distribution, surface roughness), structural (phase composition, crystal structure), optical (band gap, transmission coefcients) properties and the chemical composition of the synthesized nanocrystals and the obtained flms were studied. X-ray difraction analysis, transmission and scanning electron microscopies, atomic force microscopy, Fourier-transform infrared (FTIR) and optical spectroscopies, and energy-dispersive X-ray spectroscopy (EDS) were used to study the properties of obtained ZnO materials. The flms, annealed at Ta=400 °C for ta=60 min, and nanocrystals, synthesized for tg=120 min, have the good fundamental characteristics for application in the microelectronic devices, especially in solar cells and thermoelectric generators.