162 research outputs found
Visible Photoluminescence of Zinc Oxide Films Electrochemically Deposited on Silicon Substrates
No full textContinuous crystalline films of zinc oxide (ZnO) with thicknesses of 6-10 mu m were obtained by electrochemical deposition from aqueous zinc nitrate solutions on silicon substrates with a buffer nickel layer. X-ray diffraction measurements showed that the polycrystalline films possess a hexagonal crystal lattice with predominant (0002) orientation. The obtained ZnO films exhibit strong photoluminescence in the visible spectral range at room temperature
Electrochemical and hydrothermal deposition of ZnO on silicon: from continuous films to nanocrystals
No full textThis article presents the study of the electrochemical deposition of zinc oxide from the non-aqueous solution based on dimethyl sulfoxide and zinc chloride into the porous silicon matrix. The features of the deposition process depending on the thickness of the porous silicon layer are presented. It is shown that after deposition process the porous silicon matrix is filled with zinc oxide nanocrystals with a diameter of 10-50 nm. The electrochemically deposited zinc oxide layers on top of porous silicon are shown to have a crystalline structure. It is also shown that zinc oxide crystals formed by hydrothermal method on the surface of electrochemically deposited zinc oxide film demonstrate ultra-violet luminescence. The effect of the porous silicon layer thickness on the morphology of the zinc oxide is shown. The structures obtained demonstrated two luminescence bands peaking at the 375 and 600 nm wavelengths. Possible applications of ZnO nanostructures, porous and continuous polycrystalline ZnO films such as gas sensors, light-emitting diodes, photovoltaic devices, and nanopiezo energy generators are considered. Aspects of integration with conventional silicon technology are also discussed
Electrochemical deposition of zinc oxide on a thin nickel buffer layer on silicon substrates
No full textElectrochemical deposition of ZnO from aqueous nitrate solutions on nickel and platinum electrodes was investigated using the voltammetry technique to determine the optimal regimes in both potentiostatic and galvanostatic modes for acquiring polycrystalline ZnO films. Scanning electron microscopy, X-ray diffractometry, and X-ray microanalysis of the formed ZnO films are presented, showing a polycrystalline structure of the ZnO films with a preferable orientation in the (0 0 0 2) direction and an exact stoichiometric composition. The deposited ZnO films demonstrate a strong visible yellow-greenish photoluminescence at room temperature with a maximum at 600 um that can be referred to crystal lattice oxygen defects. The maximum of the photoluminescence excitation spectrum at 370 nm corresponds to the band gap of ZnO (3.3-3.35 eV) confirming that band-to-band excitation mechanism takes place. (C) 2011 Elsevier Ltd. All rights reserved
Determining the Project Model for Implementation ERP Class Information System for the Resurses and Activities Management in Territorial Communities
No full textO. P. Kopishynska, Y. V. Utkin, O.V. Kalashnik, S. E. Moroz, V. M. Chubenko. Determining the Project Model for Implementation ERP Class Information System for the Resurses and Activities Management in Territorial Communities. Інформаційні технології в енергетиці та агропромисловому комплексі: Матеріали ХІІ Міжнар. Наук. Конференції (Львів, 04-06 жовтня 2023 р.) / ЛНУП: за заг. ред. В. В. Снітинського. Львів: ЛНУП, 2023. C. 86-87.The paper presents a case study on the preparation of a pilot project for the implementation of ERP system modules for managing the resources and activities of the territorial community. Based on the study of the structure and activity of territorial communities, the uniqueness of such a solution for non- industrial organizations is revealed. Results of the survey of specialists and the content of the work at the project initiation stage are summarized
Determining the Project Model for Implementation ERP Class Information System for the Resurses and Activities Management in Territorial Communities
No full textO. P. Kopishynska, Y. V. Utkin, O.V. Kalashnik, S. E. Moroz, V. M. Chubenko. Determining the Project Model for Implementation ERP Class Information System for the Resurses and Activities Management in Territorial Communities. Інформаційні технології в енергетиці та агропромисловому комплексі: Матеріали ХІІ Міжнар. Наук. Конференції (Львів, 04-06 жовтня 2023 р.) / ЛНУП: за заг. ред. В. В. Снітинського. Львів: ЛНУП, 2023. C. 86-87.The paper presents a case study on the preparation of a pilot project for the implementation of ERP system modules for managing the resources and activities of the territorial community. Based on the study of the structure and activity of territorial communities, the uniqueness of such a solution for non- industrial organizations is revealed. Results of the survey of specialists and the content of the work at the project initiation stage are summarized
ZnO films and crystals on bulk silicon and SOI wafers: Formation, properties and applications
No full textIn present work the investigation of the electrochemical and chemical hydrothermal deposition processes of ZnO on silicon is presented. The influence of the electrochemical process parameters on the characteristics and morphology of the ZnO deposits is analyzed. Electrochemical deposition from non aqueous DMSO solutions on porous silicon buffer layer is also discussed. The details of the chemical hydrothermal deposition from the nitrate bath of high-quality ZnO crystals on silicon substrate are presented. It was shown that morphology and size of synthesized ZnO crystals depends on the temperature of the deposition bath. Differences between photoluminescence of electrochemically deposited ZnO thin films and hydrothermally synthesized crystals are shown. Electrochemically deposited ZnO films demonstrate defect-caused luminescence and hydrothermally grown ZnO crystals shows intensive exciton luminescence band in UV region. Hydrothermal deposition of high-quality ZnO crystals on the surface of electrochemically deposited ZnO seed layer with porous silicon buffer improves photoluminescence properties of the structure which is useful for optoelectronics applications. Possible applications of ZnO as gas sensors and photovoltaic devices are considered. Aspects of ZnO electrochemical deposition on bulk silicon and silicon-on-isolator wafers for integration purposes are discussed
HYDROTHERMAL DEPOSITION OF ZINC OXIDE NANOSTRUCTURES ON SILICON SUBSTRATES UNDER DIFFERENT CONDITIONS
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Hydrothermal deposition of zinc oxide nanostructures on silicon substrates under different conditions
No full textIn this paper we investigated hydrothermal deposition of ZnO nanostructures on silicon substrates under different conditions. Correlations between the structural properties of ZnO nanostructures and parameters of hydrothermal deposition process ( temperature, process duration ) were studied. Photoluminescence spectra of ZnO nanostructures were investigated as well. Optimal conditions of zinc oxide nanostructures arrays deposition for random lasers applications have been determined
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