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Browsing Articole din publicaţii internaţionale by Author "URSAKI, V. V."

Browsing Articole din publicaţii internaţionale by Author "URSAKI, V. V."

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  • Electronic structure of HgGa2S4 
    ATUCHIN, V. V.; KESLER, V. G.; URSAKI, V. V.; TEZLEVAN, V. E. (ELSEVIER, 2006)
    Transport method are investigated with X-ray photoemission spectroscopy. The valence band of HgGa2S4 is found to be formed by splitted S 3p and Hg 6s states at binding energies BE=3–7eV and the components at BE=7–11eV ...
  • Energy band structure and Frenkel excitons in PbGa2S4 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; PARVAN, V. I.; ZALAMAI, V. V. (ELSEVIER, 2012)
    Optical reflection spectra are measured and calculated in PbGa2S4 crystals in the region of resonances related to excitons with large oscillator strength and binding energy (Frenkel excitons). The splitting of the upper ...
  • Energy band structure and optical constants of ZnAs2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; DOROGAN, A. V. (ELSEVIER, 2012)
    The fine structure of the Fabry–Perot interference as well as the interference of ordinary and extraordinary waves is investigated in ZnAs2 crystals. ε1, ε2, n and k optical constants are calculated in a wide spectral range ...
  • Enhanced radiation hardness of ZnO nanorods versus bulk layers 
    BURLACU, A.; URSAKI, V. V.; LINCOT, D.; SKURATOV, V. A.; PAUPORTE, T.; RUSU, E.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2008)
    It is shown that ZnO nanorods grown by MOCVD exhibit enhanced radiation hardness against high energy heavy ion irradiation as compared to bulk layers. The decrease of the luminescence intensity induced by 130 MeV Xe+23 ...
  • Environmentally friendly approach for nonlithographic nanostructuring of materials 
    TIGINYANU, I. M.; MONAICO, E.; ALBU, S.; URSAKI, V. V. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2007)
    Self-organized quasi-ordered two-dimensional hexagonal arrays of pores with diameters as low as 70 nm in n-InP substrates subjected to anodic etching in aqueous solution of NaCl are reported. We show that proper periodic ...
  • Epitaxial Electrodeposition of ZnO Nanowire Arrays on p-GaN for Efficient UV-Light-Emitting Diode Fabrication 
    LUPAN, O.; PAUPORTÉ, T.; VIANA, B.; TIGINYANU, I. M.; URSAKI, V. V.; CORTÈS, R. (American Chemical Society, 2010)
    The electrochemical growth of ZnO nanowire arrays on p-type GaN (0001) single crystalline thin films supported on sapphire is demonstrated for the first time. The deposited ZnO-NWs exhibited a very low density of intrinsic ...
  • Er- and Eu-doped GaP-oxide porous composites for optoelectronic applications 
    SIRBU, L.; URSAKI, V. V.; TIGINYANU, I. M.; DOLGALEVA, Ksenia; BOYD, Robert W. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2007)
    We demonstrate the controlled preparation of Er- and Eu-doped GaP-oxide porous composites. The fabrication procedure entails the use of porous semiconductor templates and the impregnation of rare earth ions from a rare ...
  • Evolution of Pore Growth in GaAs in Transitory Anodization Regime from One Applied Voltage to Another 
    MONAICO, E. I.; MONAICO, E. V.; URSAKI, V. V.; TIGINYANU, I. M. (Springer Nature Switzerland, 2021)
    The paper reports the results of investigation of the pore growth during anodic etching of (111)-oriented wafers of Si-doped n-GaAs in an environmentally friendly NaCl based electrolyte, with switching the applied voltage ...
  • Excitation and temperature tuned photoluminescence in HgGa2S4 single crystals 
    URSAKI, V. V.; RICCI, P. C.; TIGINYANU, I. M.; ANEDDA, A.; SYRBU, N. N.; TEZLEVAN, V. E. (ELSEVIER, 2002)
    Mercury thiogallate single crystals are shown to exhibit bright photoluminescence (PL) tunable in a wide spectral range from green to red when changing the excitation power density, wavelength and sample temperature. Taking ...
  • Exciton polariton spectra and carrier effective masses in ZnO single crystals 
    SYRBU, N. N.; TIGINYANU, I. M.; ZALAMAI, V. V.; URSAKI, V. V.; RUSU, E. V. (ELSEVIER, 2004)
    Photoreflectivity and photoluminescence spectra in the region of exciton resonance were measured in ZnO single crystals. A, B, and C exciton binding energies were determined from the energy position of the ground and excited ...
  • Exciton spectra, valence band splitting, and energy band structure of CuGaxIn1−xS2 and CuGaxIn1−xSe2 crystals 
    SYRBU, N. N.; TIGINYANU, I. M.; NEMERENCO, L. L.; URSAKI, V. V.; TEZLEVAN, V. E.; ZALAMAI, V. V. (ELSEVIER, 2005)
    Exciton spectra are studied in CuGaXIn1−XS2 solid solutions by means of photoreflectivity and wavelength modulation spectroscopy at liquid nitrogen temperature. The exciton parameters, dielectric constants, and free carrier ...
  • Exciton–phonon luminescence and Raman scattering in CuGaS2 crystals 
    SYRBU, N. N.; TEZLEVAN, V. E.; GALBICH, I.; NEMERENCO, L. L.; URSAKI, V. V. (ELSEVIER, 2009)
    Photoluminescence and resonance Raman scattering spectra of CuGaS2 crystals are investigated at low temperature (10K) under the excitation with the radiation from a spectral interval obtained by passing the radiation of ...
  • Fabrication and characterization of an individual ZnO microwire-based UV photodetector 
    CHAI, G. Y.; CHOW, L.; LUPAN, O.; RUSU, E.; STRATAN, G. I.; HEINRICH, H.; URSAKI, V. V.; TIGINYANU, I. M. (ELSEVIER, 2011)
    In this paper, a single ZnO microwire-based photodetector for the monitoring of ultraviolet (UV) radiation is described. Single crystal ZnO microwires were synthesized using a chemical vapor deposition (CVD) on the Si or ...
  • Fabrication and photoluminescence properties of porous CdSe 
    TIGINYANU, I. M.; MONAICO, E.; URSAKI, V. V.; TEZLEVAN, V. E.; BOYD, Robert W. (Springer Nature Switzerland, 2005)
    We report the results of a study of the growth of pores in n-CdSen-CdSe single crystals using anodic etching techniques. Upon anodization in dark, a nonuniform distribution of pores was produced. However, anodic dissolution ...
  • Filiform Nanostructure Technologies Based on Microwire Stretching 
    IOISHER, A. M.; BADINTER, E. Ya.; POSTOLACHE, V.; MONAICO, E. V.; URSAKI, V. V.; SERGENTU, V. V.; TIGINYANU, I. M. (American Scientific Publishers, 2012)
    A technological route allowing one to integrate huge amounts of electrically isolated metal, semiconductor, or semimetal nanowires in glass fibers with the diameter of up to a few hundreds of micrometers is presented, and ...
  • Focusing slabs made of negative index materials based on inhomogeneous dielectric rods 
    SERGENTU, V. V.; URSAKI, V. V.; TIGINYANU, I. M.; FOCA, E.; FÖLL, H.; BOYD, Robert W. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2006)
    We show the advantages of using inhomogeneous dielectric rods to design photonic crystals that behave as materials with negative refractive index. We found that the analysis of light scattering properties of inhomogeneous ...
  • Free excitons in strained MOCVD-grown GaN layers 
    SYRBU, N. N.; TIGINYANU, I. M.; URSAKI, V. V.; ZALAMAI, V. V.; POPA, Veaceslav; HUBBARD, S. M.; PAVLIDIS, Dimitris (Cambridge University Press, 2003)
    GaN layers grown on sapphire substrates were characterized using high resolution optical reflectivity and absorption spectroscopy in the region of ground and excited exciton states. The main exciton parameters are deduced ...
  • Frenkel excitons and the energy bands structure in crystals PbGa2S4 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; PARVAN, V. I.; ZALAMAI, V. V. (Institutul de Fizică Aplicată al AŞM, 2012)
    On the basis of lead tiogalat (PbGa2S4) was created the active elements for lasers which allow to control the generation spectroscopic properties of lasers and parameters of the laser radiation. In these crystals were found ...
  • Fröhlich vibrational modes in porous ZnSe studied by Raman scattering and Fourier transform infrared reflectance 
    IRMER, G.; MONAICO, E.; TIGINYANU, I. M.; GÄRTNER, G.; URSAKI, V. V.; KOLIBABA, G. V.; NEDEOGLO, D. D. (IOP Publishing, 2009)
    Arrays of parallel pores with a diameter of around 60 nm have been introduced by anodic etching in ZnSe single crystals with a free electron concentration of 4 × 1017 cm−3. Porosity-induced Fröhlich vibrational modes were ...
  • Functionalized individual ZnO microwire for natural gas detection 
    CHAI, G. Y.; LUPAN, O.; RUSU, E. V.; STRATAN, G. I.; URSAKI, V. V.; SONTEA, V.; KHALLAF, H.; CHOW, L. (ELSEVIER, 2012)
    A single ZnO microwire detector for the monitoring of natural gas species is described. Single-crystal ZnO microwires were synthesized using a carbothermal reduction vapor phase transport method. It was characterized by ...

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