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Anizotropy of Photoconductivity in BiOCl (X=Cl, Br, I) Single Crystals

100%
Komanicky V., Bunda S., Botko M., Bunda V.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
274-275
EN
Oxyhalides of bismuth BiOX (X = Cl, Br, I) are very interesting materials which find various applications as X-ray luminescent screens, as anti-Stokes converters, photocatalyst, usual luminophors and as photoconductive analyzer of linear polarized radiation in the 0.24 - 1.2 μm spectral region. The great interest for these materials is strongly related to the influence of dimensionality on the behaviour of physical properties (they are 2D structured materials). Bismuth oxyhalides are one of the V-VI-VII group compound semiconductors belonging to the tetragonal system. The structure of BiOX is known to have a layered structure, which is constructed by the combination of the halide ion layer and the bismuth oxygen layer. We present results of the study of photoconductivity spectra anisotropy of the BiOX single crystals.
2
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Thermopower and Surface Magnetic Characterization of Ni Thin Layers

76%
Szabo A., Varga R., Ujhelyi F., Komanicky V., Zorkovska A., Lovas A.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
204-205
EN
Thermoelectric power and surface magnetic characterization of Ni evaporated layers will be presented, with the comparison with the bulk Ni material. The bulk electrical and magnetic properties are developed gradually, approaching the bulk properties, as the layer thickness increases. Below the thickness of 180 nm, the evaporated layers are amorphous. The epitaxial stresses can appear in both, the anomaly observed in the thermopower and the surface coercivity measurements.
3
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Application of Superconductor/Photosemiconductor Contact Structures in Electronics

76%
Bunda V., Bunda S., Komanicky V., Botko M., Čižmár E., Feher A.
Acta Physica Polonica A
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2014
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vol. 126
|
issue 1
362-363
EN
In recent years, two-dimensional (2D) nanostructured materials, such as nanoplates and nanosheets, have attracted much attention because of their unique electronic, magnetic, optical, and catalytic properties, which mainly arise from their large surface areas, nearly perfect crystallinity, structural anisotropy, and quantum confinement effects in the thickness. The 2D nanostructured materials can be used as building blocks for advanced materials and devices with designed functions in areas as diverse, as lasers, transistors, catalysis, solar cells, light emission diodes, chemical and biological sensors. We report physical properties of YBCO/BiOI contact structures and electrophysical properties of BiOI single crystal.
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