http://dspace.nbuv.gov.ua:80/handle/123456789/114588 2026-04-18T23:56:12Z http://dspace.nbuv.gov.ua:80/handle/123456789/117920 Organic iso-type pentacene – lead phthalocyanine heterostructures Vertsimakha, Ya.I.; Lutsyk, P.M. The photovoltaic properties of organic iso-type heterostructures based on pentacene (Pn) and lead phthalocyanine (PbPc) prepared by thermal deposition at different substrate temperatures (Ts) are investigated. It is shown that, at modulated illumination for Pn/PbPc heterostructures prepared at Тs = 300 K, the reversal of a sign is observed in photovoltage spectra. The properties of the structures are well described by the Van Opdorp model that indicates the presence of the high surface recombination rate of charge carriers at the interface of heterostructure components. At this, the contribution of heterostructure components to the photovoltage formation can be changed with unmodulated monochromatic additional illumination. In Pn/PbPc heterostructures prepared at Ts = 370 K, there is no reversal of the photovoltage sign, and the photovoltage is significantly (up to twice) higher in comparison with both heterostructures obtained at Ts = 300 K and separate layers of components (Pn and PbPc). This is the evidence for the low recombination rate of charge carriers at the interface of Pn/PbPc heterostructures prepared at Ts = 370 K 2007-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/117919 Influence of ion implantation on the near-surface structure of thin Ni and Pd films on lithium niobate and lithium tantalate Lysiuk, V.O.; Staschuk, V.S.; Kluy, M.I.; Vakulenko, O.V.; Poperenko, L.V. The systems “thin Ni film – lithium niobate” and “thin Pd film – lithium tantalate” are implanted by Ar⁺ ions with an energy of 100 keV and a dose of 10¹⁶ cm⁻². Analyses of the systems by AFM and SEM have shown that the ion implantation essentially modifies the near-surface structure resulting in a change of its optical, electrical, and mechanical properties. Strong difference in the near-surface structures between implanted systems with Ni or Pd thin films is observed. Such a difference is explained by the heterogeneity of an ion beam and different properties of the materials. The application to the development of high-sensitive pyroelectric detectors with high damage threshold is proposed. 2007-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/117918 Investigation of light polarization in CdS in the presence of two-photon absorption Kulish, M.R.; Lisitsa, M.P.; Malysh, N.I. It is shown that, under the two-photon absorption in CdS, the increase in the azimuth of polarization causes a smooth change of the large semi-axis angle rotation, ellipticity, focal parameter, and eccentricity of the polarization ellipse. When the angle of phase lag δ = 40⁰, the minimum value of ellipticity and the maximal values of focal parameter and eccentricity will be realized. 2007-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/117917 Characterization of nanoscaled films on flat and grating substrates as some elements of plasmonics Dmitruk, N.L.; Mayeva, O.I.; Korovin, A.V.; Mamykin, S.V.; Sosnova, M.V.; Yastrubchak, O.B. The optical properties of multilayer structures consisting of dielectric, conductivity-oxide and nanoscaled metal layers, deposited on the planar substrates (witness samples) and surface relief ones (diffraction gratings) with micro- and nanoscale sizes, are investigated by AFM, spectral ellipsometry (SE), and photometric techniques. The SE-measured parameters are related to actual characteristics of the layers when specified the model of their near-surface regions. Using a parametrization of the layer dielectric function versus the wavelength and a fitting procedure, the dielectric parameters are determined. It is shown that the optical constants are affected by both the substrate morphology and the adjacent medium. Preliminary data about the influence of isolated particle plasmon excitations in 2D-substrates with the top nanoscaled Au layer on its optical properties are presented. 2007-01-01T00:00:00Z