http://dspace.nbuv.gov.ua:80/handle/123456789/114577 2026-04-12T17:24:03Z 2026-04-12T17:24:03Z Barchuk, О.I. Braginets, Y.V. Klimov, O.S. Oberemok, Y.A. Savenkov, S.N. http://dspace.nbuv.gov.ua:80/handle/123456789/118614 2017-05-31T00:08:19Z 2009-01-01T00:00:00Z

Testing the optical methods by using the multi-level holographic grating Barchuk, О.I.; Braginets, Y.V.; Klimov, O.S.; Oberemok, Y.A.; Savenkov, S.N. In this work the interaction peculiarities of electro-magnetic optical range radiation with gratings’ surfaces are investigated. The multilevel diffractive holographic grating is proposed to be used for the polarization optical methods testing. This object allowed to obtain simultaneous visualization of different spatial frequencies and to estimate both structure and surface peculiarities when working with 3D-objects. Using this additional information one can remove uncertainty in solution of the inverse problem of ellipsometry related with ellipsometric angles periodicity. Thereby, multiangle ellipsometry allowing investigation of the specular reflection component could be used to study submicron peculiarities of the object. We have also presented the basic aspects of ellipsometric method optimization. It was shown that anisotropy parameters, such as linear amplitude anisotropy and linear phase anisotropy, obtained from ellipsometric measurements are the most effective to ascertain the submicron characteristic dimension of material.

2009-01-01T00:00:00Z Syromyatnikov, V. Pomaz, I. Verbitsky, A. Vertsimakha, Ya. Nešpůrek, S. Pochekaylov, S. http://dspace.nbuv.gov.ua:80/handle/123456789/118613 2017-05-31T00:02:51Z 2009-01-01T00:00:00Z

Photosensitive in wide spectral region composites based on polyphenylenevinylene Syromyatnikov, V.; Pomaz, I.; Verbitsky, A.; Vertsimakha, Ya.; Nešpůrek, S.; Pochekaylov, S. Optical and photovoltaic properties of polyphenylenevinylene derivative – poly(2-methoxy-5-(3-,7-dimethyl-octyloxy)-1,4-phenylenevinylene (MDMO-PPV) and its composites with high (40 %) concentration polymethine dyes (PD) – meso-Cl and hexaindoletricarbocyanine (HITC) films have been studied. Two H-aggregates of dyes with different energies that weakly depend on the molecular structure of dyes, is formed in MDMO-PPV with PD in composites films. The efficiency of photogeneration of charge carrier by these aggregates is greater than the efficiency of photogeneration of charge carriers by the quasi-isolated molecules of dye. It results in substantial expansion of the absorption region (in comparison with the absorption region of molecules in solution) and photosensitivity in the side of higher energies. The presence of PD aggregates in the films MDMO-PPV influences on their photosensitivity that depends on PD molecular structure. This dependence can be caused by interaction between the molecules of MDMO-PPV and dye. In composites MDMO-PPV/HITC, the value of interaction is low and practically does not influence the efficiency of photogeneration of charge carriers by MDMO-PPV molecules, which give a considerable contribution to formation of the photovoltage in 2-3 eV regions. The interaction of meso-Cl and MDMO-PPV molecules is stronger, and this, probably, results in considerable decrease of photovoltage in the region of the excitation of MDMO-PPV.

2009-01-01T00:00:00Z Nazarov, A.N. Osiyuk, I.N. Tiagulskyi, S.I. Lysenko, V.S. Tyagulskyy, I.P. Torbin, V.N. Omelchuk, V.V. Nazarova, T.M. Rebohle, L. Skorupa, W. http://dspace.nbuv.gov.ua:80/handle/123456789/118612 2017-05-31T00:10:06Z 2009-01-01T00:00:00Z

Erratum: Electrical and light-emitting properties of silicon dioxide co-implanted by carbon and silicon ions Nazarov, A.N.; Osiyuk, I.N.; Tiagulskyi, S.I.; Lysenko, V.S.; Tyagulskyy, I.P.; Torbin, V.N.; Omelchuk, V.V.; Nazarova, T.M.; Rebohle, L.; Skorupa, W. In this paper, we explore the electrophysical and electroluminescence (EL) properties of thermally grown 350 nm thick SiO₂ layers co-implanted with Si⁺ and C⁺ ions. The implanting fluencies were chosen in such a way that the peak concentration of excess Si and C of 5-10 at.% were achieved. Effect of hydrogen plasma treatment on electroluminescence and durability of SiO2 (Si,C) - Si-system is studied. Combined measurements of charge trapping and EL intensity as a function of the injected charge and current have been carried out with the aim of clarifying the mechanisms of electroluminescence. EL was demonstrated to have defect-related nature. Cross-sections of both electron traps and hole traps were determined. EL quenching at great levels of injected charge is associated with strong negative charge capture, following capture of positive charge leading to electrical breakdown of SiO₂ structures.

2009-01-01T00:00:00Z Bratus, O. Evtukh, A. Kaganovich, E. Kizjak, A. Kizjak, I. Manoilov, E. http://dspace.nbuv.gov.ua:80/handle/123456789/118611 2017-05-31T00:04:08Z 2009-01-01T00:00:00Z

Charge storage characteristics of gold nanoparticles embedded in alumina matrix Bratus, O.; Evtukh, A.; Kaganovich, E.; Kizjak, A.; Kizjak, I.; Manoilov, E. The processes of charge accumulation in the nonvolatile memory metal-oxidesilicon capacitors with gold nanoparticles floating gate formed by the pulsed laser deposition method are investigated. The regularities of formation of alumina films with gold nanoparticles are the result of their deposition from the back flow of low-energy particles from the erosion torch. With removing from the torch axis, sizes of gold particles and the film thickness decreased. When recording the capacitance-voltage curves, the capture of a negative charge was observed. It was shown that the concentration of gold nanoparticles in alumina matrix and the thickness of nanocomposite films remarkably influenced on the stored charge. The observed flat band voltage shift was in the range 1 to 14 V. To explain the peculiarities of charge storage in the composite films, the electron transport through them was investigated.

2009-01-01T00:00:00Z