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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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  • Time resolved blue and ultraviolet photoluminescence in porous GaP 
    ANEDDA, A.; SERPI, A.; KARAVANSKII, V. A.; TIGINYANU, I. M.; ICHIZLI, V. M. (American Institute of Physics, 1995)
    Porous GaP layers prepared by electrochemical anodization of (100)-oriented bulk material was found to exhibit blue and ultraviolet photoluminescence when excited by a KrF excimer laser. The energy position of the UV ...
  • Towards Uniform Electrochemical Porosification of Bulk HVPE-Grown GaN 
    MONAICO, Ed.; MOISE, C.; MIHAI, G.; URSAKI, V. V.; LEISTNER, K.; TIGINYANU, I. M.; ENACHESCU, M.; NIELSCH, K. (The Electrochemical Society, 2019)
    In this paper, we report on results of a systematic study of porous morphologies obtained using anodization of HVPE-grown crystalline GaN wafers in HNO3, HCl, and NaCl solutions. The anodization-induced nanostructuring is ...
  • Ultrashort Electromagnetic Modes in the Low Frequency Region of the Spectrum in a Nanocylinder Array 
    SIRBU, L.; SERGENTU, V.; MULLER, R.; URSAKI, V.; TIGINYANU, I. M. (Springer Nature Switzerland, 2014)
    In this work we present the theoretical model of existence of ultrashort modes in low frequency region of the electromagnetic spectrum in a system of nanocilinders array. These modes have no analogue in a spectrum with ...
  • Ultraviolet photoconductive sensor based on single ZnO nanowire 
    LUPAN, O.; CHAI, G.; CHOW, L.; EMELCHENKO, G. A.; HEINRICH, H.; URSAKI, V. V.; GRUZINTSEV, A. N.; TIGINYANU, I. M.; REDKIN, A. N. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2010)
    ZnO nanowires were synthesized by the CVD procedure and have been investigated by SEM, TEM, SAED, Raman, and cw PL spectroscopy. The fabrication of an ultraviolet (UV) photoconductive detector based on single ZnO nanowire ...
  • Uniform and Nonuniform Nucleation of Pores during the Anodization of Si, Ge, and III-V Semiconductors 
    LANGA, S.; CARSTENSEN, J.; CHRISTOPHERSEN, M.; STEEN, K.; FREY, S.; TIGINYANU, I. M.; FÖLL, H. (The Electrochemical Society, Inc., 2005)
    Morphology is one of the basic characteristics of porous layers. For electrochemically grown pores, morphology is strongly dependent on the starting phase of pore growth, the so-called nucleation phase. This paper addresses ...
  • UV-Blue and Green Electroluminescence from Cu-Doped ZnO Nanorod Emitters Hydrothermally Synthesized on p-GaN 
    LUPAN, O.; PAUPORTE, T.; VIANA, B.; URSAKI, V. V.; TIGINYANU, I. M.; SONTEA, V.; CHOW, L. (American Scientific Publishers, 2012)
    Aqueous solution synthesis of ZnO nanorods on p-GaN(0001) is a low-temperature (< 100 C) and cost-efficient growth technique of high quality emitters for LED applications. We present morphological, optical and structural ...
  • Vibrational properties of CdGa2S4 at high pressure 
    GALLEGO-PARRA, S.; GOMIS, O.; VILAPLANA, R.; ORTIZ, H. M.; PÉREZ-GONZÁLEZ, E.; LUNA, R.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; URSAKI, V. V.; TIGINYANU, I. M.; MANJÓN, F. J. (AIP Publishing LLC, 2019)
    Raman scattering measurements have been performed in cadmium digallium sulphide (CdGa2S4) with defect chalcopyrite structure up to 25 GPa in order to study its pressure-induced phase transitions. These measurements have ...
  • Vibrational study of HgGa2S4 under high pressure 
    VILAPLANA, R.; ROBLEDILLO, M.; GOMIS, O.; SANS, J. A.; MANJÓN, F. J.; PÉREZ-GONZÁLEZ, E.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; TIGINYANU, I. M.; URSAKI, V. V. (American Institute of Physics, 2013)
    In this work, we report on high-pressure Raman scattering measurements in mercury digallium sulfide (HgGa2S4) with defect chalcopyrite structure that have been complemented with lattice dynamics ab initio calculations. Our ...
  • Voltage oscillations – an emergent property at high density pore growth 
    LANGA, S.; CARSTENSEN, J.; CHRISTOPHERSEN, M.; TIGINYANU, I. M.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2003)
    The paper addresses macroscopic voltage oscillations observed during anodic etching of pores in n-InP and GaP. These oscillations always occur concurrently with the modulation of pore diameters which are synchronized on ...
  • Waveguide Structures Based on Porous Indium Phosphide 
    LANGA, S.; FREY, S.; CARSTENSEN, J.; FÖLL, H.; TIGINYANU, I. M.; HERMANN, M.; BÖTTGER, G. (The Electrochemical Society, 2005)
    We researched the possibilities for engineering the morphology of porous structures in n-InP. Lithographic patterning of the sample surface before anodic etching was shown to modify considerably the electric field distribution ...
  • The Way to Uniformity in Porous III–V Compounds via Self-Organization and Lithography Patterning 
    LANGA, S.; CARSTENSEN, J.; CHRISTOPHERSEN, M.; FÖLL, H.; TIGINYANU, I. M. (Springer Nature Switzerland, 2005)
    The factors determining the morphology of electrochemically etched III–V compounds have been reviewed by Gomes and Goossens as well as by Notten et al. [1,2]. Under anodic conditions the p- and n-type materials were found ...
  • Well-aligned arrays of vertically oriented ZnO nanowires electrodeposited on ITO-coated glass and their integration in dye sensitized solar cells 
    LUPAN, O.; GUÉRIN, V. M.; TIGINYANU, I. M.; URSAKI, V. V.; CHOW, L.; HEINRICH, H.; PAUPORTÉ, T. (ELSEVIER, 2010)
    We report on the effects of post-growth hydrothermal treatment and thermal annealing on properties of vertically aligned ZnO nanowires arrays (NWs). The samples were electrochemically deposited (ECD) on indium–tin oxide ...
  • Whispering gallery modes and random lasing in ZnO microstructures 
    URSAKI, V. V.; BURLACU, A.; RUSU, E. V.; POSTOLAKE, V.; TIGINYANU, I. M. (IOP Publishing, 2009)
    Hexagonal ZnO microdiscs and hemispherical ZnO microstructure built from hierarchical nanostructures have been grown by metal–organic chemical vapour deposition and carbothermal evaporation technologies, respectively. The ...
  • X-ray diffraction study on pressure-induced phase transformations and the equation of state of ZnGa2Te4 
    ERRANDONEA, D.; KUMAR, R. S.; GOMIS, O.; MANJÓN, F. J.; URSAKI, V. V.; TIGINYANU, I. M. (AIP Publishing LLC, 2013)
    We report on high-pressure x-ray diffraction measurements up to 19.8 GPa in zinc digallium telluride (ZnGa2Te4) at room temperature. An irreversible structural phase transition takes place at pressures above 12.1 GPa and ...
  • Yellow Luminescence and Optical Quenching of Photoconductivity in Ultrathin Suspended GaN Membranes Produced by Surface Charge Lithography 
    POPA, V.; BRANISTE, T.; STEVENS-KALCEFF, M. A.; GERTHSEN, D.; BRENNER, P.; POSTOLACHE, V.; URSAKI, V.; TIGINYANU, I. M. (American Scientific Publishers, 2013)
    Spatial and spectral distribution of cathodoluminescence as well as photoelectrical properties under excitation with two beams of monochromatic radiation of various wavelengths are investigated in ultrathin suspended GaN ...
  • Zn/sup +/, Zn/sup +//P/sup +/ and Zn/sup +//As/sup +/ implanted InP: study of electrical and symmetry properties 
    TIGINYANU, I. M.; KRAVETSKY, I. V.; URSAKI, V. V.; MAROWSKY, G.; HARTNAGEL, H. L. (IEEE, 1997)
    InP is known to be characterized by a low activation efficiency of p-type dopants. Some attempts have been previously undertaken to use the coimplantation of P/sup +/ ions in order to improve the activation efficiency of ...
  • Zn/sup +//P/sup +/ and Zn/sup +//As/sup +/ co-implantation in InP single crystals 
    URSAKI, V. V.; TIGINYANU, I. M.; ICHIZLI, V. M.; TERLETSKY, A. I.; PYSHNAYA, N. B.; RADAUTSAN, S. I. (IEEE, 1996)
    The activation efficiency of zinc impurity co-implanted with P/sup +/ and As/sup +/ ions in InP was studied by Hall-effect measurements. Both P/sup +/ and As/sup +/ co-implantations followed by post-implantation annealing ...
  • ZnO lasing in complex systems with tetrapods 
    MARKUSHEV, V. M.; URSAKI, V. V.; RYZHKOV, M. V.; BRISKINA, C. M.; TIGINYANU, I. M.; RUSU, E. V.; ZAKHIDOV, A. A. (Springer Nature Switzerland, 2008)
    ZnO structure in the form of a core–shell wire was grown with a modified vapour transport and condensation method. The wire consists of a dense core which may play the role of a waveguide and a shell formed mainly from ...

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