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Browsing Articole din publicaţii internaţionale by Author "TIGINYANU, I. M."

Browsing Articole din publicaţii internaţionale by Author "TIGINYANU, I. M."

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  • The Impact of High Energy Ion Irradiation Upon CO Gas Sensitivity of Nanostructured GaN Epilayers 
    VOLCIUC, O. S.; POPA, V.; TIGINYANU, I. M.; SKURATOV, V. A.; CHO, M.; PAVLIDIS, D. (Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Republic of Moldova, 2010)
    Photoelectrochemically nanostructured GaN epilayers were found to exhibit good sensitivity towards CO in the temperature range from 180 to 280°C. We show that subjection of nanostructured GaN samples to 166 MeV Xe+23 ion ...
  • The impact of morphology upon the radiation hardness of ZnO layers 
    BURLACU, A.; URSAKI, V. V.; SKURATOV, V. A.; LINCOT, D.; PAUPORTE, T.; ELBELGHITI, H.; RUSU, E. V.; TIGINYANU, I. M. (IOP Publishing, 2008)
    It is shown that ZnO nanorods and nanodots 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 ...
  • The Impact of Porosity upon the Cathodoluminescence from III-V Compounds 
    STEVENS-KALCEFF, M. A.; TIGINYANU, I. M.; LANGA, S.; FÖLL, H. (Cambridge University Press, 2002)
    The development of applications involving porous materials requires understanding of their special properties. Most published investigations have used photoluminescence (PL) techniques to determine the average emission ...
  • Impact of size upon lasing in ZnO microtetrapods 
    ZALAMAI, V. V.; URSAKI, V. V.; TIGINYANU, I. M.; BURLACU, A.; RUSU, E. V.; KLINGSHIRN, C.; FALLERT, J.; SARTOR, J.; KALT, H. (Springer Nature Switzerland, 2010)
    High optical quality, well end leg faceted ZnO microtetrapods with leg length between 1 and 12 μm have been grown by carbothermal chemical vapor deposition. Lasing with mode quality factors of 2500–3000 is demonstrated. ...
  • Impedance Spectroscopy as a Powerful Tool for Better Understanding and Controlling the Pore Growth Mechanism in Semiconductors 
    COJOCARU, A.; FOCA, E.; CARSTENSEN, J.; LEISNER, M.; TIGINYANU, I. M.; FÖLL, H. (Springer, Berlin, Heidelberg, 2009)
    This work shows new results towards a better understanding of macropore growth in semiconductor phenomenology by using in-situ FFT impedance spectroscopy. A new interpretation of the voltage impedance is proposed. In ...
  • Improvement of InP crystalline perfection by He+-implantation and subsequent annealing 
    TIGINYANU, I. M.; TERLETSKY, A. I.; URSAKI, V. V. (ELSEVIER, 1995)
    The influence has been studied of 100-keV He+-ion implantation and subsequent thermal annealing on Raman scattering spectra of LEC-grown InP single crystals with (100)- and (111)-crystallographic orientations of the surface. ...
  • The influence of isochronous annealing upon the near-band-edge photoluminescence spectra of the electron-irradiated n-InP 
    RADAUTSAN, S. I.; TIGINYANU, I. M.; URSAKI, V. V.; KORSHUNOV, F. P.; SOBOLEV, N. A.; KUDRYAVTSEVA, E. A. (ELSEVIER, 1993)
    The near-band-edge photoluminescence (PL) bands observed at 1.305 and 1.392 eV (T = 4.2 K) in electron-irradiated InP single crystals and epilayers have different behaviour with increasing temperature of isochronous ...
  • Injection photodiode based on an Al–p-Si–n-Zn85Mg15O–n-Zn65Mg35O–Ag structure 
    MORARI, V.; RUSU, E. V.; POSTOLACHE, V.; URSAKI, V. V.; TIGINYANU, I. M.; ROGACHEV, A. V.; SEMCHENKO, A. V. (Publishing House of the Romanian Academy, 2021)
    A series of Zn1−xMgxO thin films with the composition range x = 0.00–0.60 has been prepared by aerosol spray pyrolysis deposition on Si or quartz substrates. The morphology, composition, crystals structure, and optical ...
  • Intense luminescence from porous ZnSe layers 
    MONAICO, Eduard; UBRIETA, A.; FERNANDEZ, P.; PIQUERAS, J.; TIGINYANU, I. M.; URSAKI, V. V.; BOYD, Robert W. (Institutul de Fizică Aplicată, AŞM, 2006)
    The porous form of III-V semiconductors was extensively studied during the last decade. Porosity enhanced phenomena such as optical second harmonic generation and Terahertz emission have been reported. Porosity induced ...
  • Interaction of intrinsic defects with impurities in Al doped ZnSe single crystals 
    IVANOVA, G. N.; NEDEOGLO, D. D.; NEGEOGLO, N. D.; SIRKELI, V. P.; TIGINYANU, I. M.; URSAKI, V. V. (American Institute of Physics, 2007)
    We report on the results of a complex study of electrical (77−300K) and luminescence (10−300K) properties of n-ZnSen-ZnSe single crystals annealed in a Zn melt containing Al impurity at concentrations ranging from 0.1 to ...
  • The interference of additional waves of forbidden polaritons excited by allowed polaritons in CuGaS2 
    SYRBU, N. N.; URSAKI, V. V.; TIGINYANU, I. M.; TEZLEVAN, V. E.; BLAJE, M. A. (ELSEVIER, 2003)
    Additional waves of exciton polaritons are studied in thin (1.5–1.8 μm) CuGaS2 crystals at 9 K. The reflectivity spectra show a fine structure related to the interference of Fabry–Perot and additional waves which is a ...
  • Interference of birefractive waves in CdGa2S4 crystals 
    SYRBU, N. N.; TIRON, A. V.; PARVAN, V. I.; ZALAMAI, V. V.; TIGINYANU, I. M. (Elservier, 2015)
    In СdGа2S4 crystals the Fabry–Perot and birefringence interference spectra were investigated. Spectral dependences of refraction indexes for ordinary (no) and extraordinary (ne) light waves are defined. The spectral ...
  • The interference of birefractive waves in ZnAl2Se4:Co2+ crystal 
    SYRBU, N. N.; ZALAMAI, V. V.; TIRON, A.; TIGINYANU, I. M. (Elsevier, 2016)
    The anisotropy of reflection, transmission and wavelength modulated reflection and transmission optical spectra of ZnAl2Se4 crystals doped by cobalt were investigated at 10 and 300 K. Intersections of refractive indices ...
  • Lattice dynamics study of HgGa2Se4 at high pressures 
    VILAPLANA, R.; GOMIS, O.; MANJÓN, F. J.; ORTIZ, H.; PÉREZ-GONZÁLEZ, E.; LÓPEZ-SOLANO, J.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; ERRANDONEA, D.; URSAKI, V. V.; TIGINYANU, I. M. (American Chemical Society, 2013)
    We report on Raman scattering measurements in mercury digallium selenide (HgGa2Se4) up to 25 GPa. We also performed, for the low-pressure defect-chalcopyrite structure, lattice-dynamics ab initio calculations at high ...
  • Luminescence and Photoconductivity Caused by Antisite Defects in CdIn2S4 Single Crystals 
    GEORGOBIANI, A. N.; GRUZINTSEV, A. N.; RATSEEV, S. A.; TEZLEVAN, V. E.; TIGINYANU, I. M.; URSAKI, V. V. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 1986)
    Results of a study of the influence of nonstoichiometry as well as of annealing and argon ion implantation on photoluminescence and photoconductivity spectra of cadmium thioindate single crystals are presented. The energy ...
  • Luminescence of GaN nanocolumns obtained by photon-assisted anodic etching 
    TIGINYANU, I. M.; URSAKI, V. V.; ZALAMAI, V. V.; LANGA, S.; HUBBARD, S.; PAVLIDIS, D.; FÖLL, H. (American Institute of Physics, 2003)
    GaN nanocolumns with transverse dimensions of about 50 nm were obtained by illumination-assisted anodic etching of epilayers grown by metalorganic chemical vapor deposition on sapphire substrates. The photoluminescence ...
  • Luminescence properties of a ZnO–In2O3 composite 
    URSAKI, V. V.; TIGINYANU, I. M.; BURLACU, A.; ZALAMAI, V.; JITARI, V. F. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2006)
    ZnO–In2O3 composite was prepared by thermal annealing of ZnIn2S4 crystals. Energy dispersive X-ray analysis demonstrated that annealing results in the formation of a composite consisting of ZnO and In2O3 phases with the ...
  • Luminescent and Photoconductive Properties of AgGa2.5In2.5S8 and CuGa2.5In2.5S8 New Semiconductors 
    ANEDDA, A.; SERPI, A.; MOLDOVYAN, N. A.; TIGINYANU, I. M.; URSAKI, V. V. (IOP Publishing, 1993)
    Results of a complex study of photoluminescence (PL), photoconductivity (PC) and photo-voltaic (PV) spectra in AgGa2.5In2.5S8 and CuGa2.5In2.5S8 single crystals are presented. The values of indirect (Egi=2.25 eV) and direct ...
  • Luminescent materials based on semiconductor compound templates for random laser applications 
    URSAKI, V. V.; TIGINYANU, I. M.; SIRBU, L.; ENACHI, M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    A survey of methods for the preparation of luminescent nanocomposite materials with the focus on random laser media on the basis of porous semiconductor and dielectric templates is presented. Media with controlled light ...
  • Metal nanostructured ferromagnetic as a possible source of optical magnetism 
    SERGENTU, V. V.; TIGINYANU, I. M.; URSAKI, V. V. (IOP Publishing, 2012)
    It is shown analytically that plasmon-mediated magnetic response can be realized at optical frequencies in nanostructured magnetized metallic ferromagnetics under certain restrictions on their electronic subsystem. According ...

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