Articole din publicaţii internaţionale: Recent submissions

  • Micrometer-size GaN Schottky-diodes for mm-wave frequency multipliers 
    COJOCARI, O.; POPA, V.; URSAKI, V. V.; TIGINYANU, I. M.; MUTAMBA, K.; SAGLAM, M.; HARTNAGEL, H. L. (IEEE, 2004)
    Small-size Pt/n-GaN Schottky diodes are fabricated using electrochemical technique for anode metallisation. Effects of surface passivation and thermal annealing on the interface quality are studied using PL-measurements ...
  • 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 ...
  • Surface plasmon resonance in Ag nanoparticles deposited inside porous GaP templates 
    SIRBU, L.; SERGENTU, V.; URSAKI, V.; TIGINYANU, I.; PIREDDA, G.; BOYD, R. W. (IEEE, 2008)
    Surface plasmon resonance is studied for Ag nanoparticles electrochemically deposited on bulk GaP substrates and inside porous GaP templates. The size and density of Ag nanoparticles are controlled by the conditions of ...
  • Nanoimprint lithography (NIL) and related techniques for electronics applications 
    TIGINYANU, I.; URSAKI, V.; POPA, V. (Woodhead Publishing, 2011)
    This chapter provides a review of nanoimprint lithography techniques, highlighting their potential to surpass photolithography in resolution, and, at the same time, to allow mass fabrication at a lower cost. The current ...
  • Processing-Induced Modification of Photo- and Cathodoluminescence Spectra of TiO2 Nanotubes 
    ENACHI, M.; STEVENS-KALCEFF, M.; BURLACU, A.; TIGINYANU, I.; URSAKI, V. (The Electrochemical Society, 2012)
    Cathodoluminescence and photoluminecsence are investigated in titanium dioxide nanotubes (TiO2 NTs) produced in an ethylene glycol based electrolyte with the variation of the temperature of the electrolyte which allows the ...
  • Effect of heavy noble gas ion irradiation on terahertz emission efficiency of InP (100) and (111) crystal planes 
    RADHANPURA, K.; LEWIS, R. A.; SIRBU, L.; ENACHI, M.; TIGINYANU, I. M.; SKURATOV, V. A. (IOP Publishing, 2014)
    Emission of terahertz (THz) electromagnetic radiation from heavily-doped (5 × 1018 cm−3) (100) and (111) InP bulk materials and nanoporous honeycomb membranes, irradiated with heavy noble gas (Kr and Xe) ions, is presented. ...
  • Possible coherent backscattering of lightwaves from a strongly absorbing nanoporous medium 
    GAPONENKO, Sergey V.; MONAICO, Eduard; SERGENTU, Vladimir V.; PRISLOPSKI, Sergey Ya.; TIGINYANU, Ion M. (IOP Publishing, 2018)
    We report on anomalous light retroreflection from strongly absorbing nanoporous semiconductor materials, GaAs and InP, with strongly polarized retroreflected light with linear polarization coinciding with that of incident ...
  • Perovskite solar cells with ZnS as electron transport layer 
    POPA, Mihail; ZAKHIDOV, Anvar; TIGINYANU, Ion (Romanian Academy Publishing House, 2018)
    This work demonstrates the application of ZnS thin layers and the doped layers with ZnS in the perovskite solar cells. Electron transport layer has been used in three different forms. For solar cells with a single layer ...
  • 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 ...
  • Terahertz shielding properties of aero-GaN 
    BRANISTE, Tudor; ZHUKOV, Sergey; DRAGOMAN, Mircea; ALYABYEVA, Liudmila; CIOBANU, Vladimir; ALDRIGO, Martino; DRAGOMAN, Daniela; IORDANESCU, Sergiu; SHREE, Sindu; RAEVSCHI, Simion; ADELUNG, Rainer; GORSHUNOV, Boris; TIGINYANU, Ion (IOP Publishing, 2019)
    The electrodynamic properties of the first aero-material based on compound semiconductor, namely of Aero-GaN, in the terahertz frequency region are experimentally investigated. Spectra of complex dielectric permittivity, ...
  • Properties of 2D and 3D Dielectric Structures Fabricated by Electrochemical Dissolution of III-V Compounds 
    TIGINYANU, I. M.; LANGA, S.; CHRISTOPHERSEN, M.; CARSTENSEN, J.; SERGENTU, V.; FOCA, E.; RIOS, O.; FÖLL, H. (Cambridge University Press, 2001)
    Porous layers and membranes representing 2D and 3D dielectric structures were fabricated on different III-V compounds (GaAs, InP, GaP) by electrochemical etching techniques. Nonlithographically fabricated ordered nanopore ...
  • 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 ...
  • Micro-Raman study of columnar GaAs nanostructures 
    PRUNICI, Pavel; IRMER, Gert; MONECKE, Jochen; SIRBU, Lilian; TIGINYANU, Ion (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005)
    Micro-Raman scattering spectra of bulk and porous GaAs and of individual nanocolumns were studied. The GaAs nanocolumns have radii of 50–100 nm and lengths between 5 and 25 µm. The experimental data are compared with the ...
  • Shallow donor states induced in ZnSe:Au single crystals by lattice deformation 
    NEDEOGLO, N. D.; NEDEOGLO, D. D.; SIRKELI, V. P.; TIGINYANU, I. M.; LAIHO, R.; LÄHDERANTA, E. (American Institute of Physics, 2008)
    Photoluminescence (PL) spectra are investigated in n-ZnSe single crystals at different temperatures from 4.4 to 300 K immediately after doping with Au from melt of Se+Au or Zn+Au and after storage of the doped samples for ...
  • Design and Characterization of Novel Focusing Elements Based on Photonic Metamaterials 
    TIGINYANU, I. M.; FOCA, E.; SERGENTU, V. V.; URSAKI, V. V.; DASCHNER, F.; KNÖCHEL, R.; FÖLL, H. (American Scientific Publishers, 2009)
    New results in the development of photonic metamaterials based on two dimensional periodic dielectric structures are reported. We show that concave and flat lenses consisting of homogeneous or inhomogeneous dielectric rods ...
  • 11 - Ultra-thin membranes for sensor applications 
    TIGINYANU, I.; URSAKI, V.; POPA, V. (Woodhead Publishing, 2011)
    Technological approaches for the fabrication of ultra-thin membranes for sensor applications are reviewed, with the main focus on graphene and two-dimensional (2D) sheets of layered compounds such as BN, MoS2, Bi2Te3, ...
  • Nanostructured Polymer/CdS Photoluminescent Thin Films 
    IOVU, M.; TIGINYANU, I.; CULEAC, I.; ROBU, S.; NISTOR, Iu.; DRAGALINA, G.; ENACHI, M.; PETRENKO, P. (American Scientific Publishers, 2012)
    We present here experimental results on polymer-based nanocomposite material made of styrene with butyl methacrylate (SBMA) (1:1), isothiocyanato-chalcone (ITCC) and inorganic semiconductor CdS. The concentration of CdS ...
  • GaN nanostructuring for the fabrication of thin membranes and emerging applications 
    TIGINYANU, Ion; URSAKI, Veaceslav (TUBITAK, 2014)
    We present a review of technological methods developed in recent years for the purpose of gallium nitride nanostructuring, with the main focus on fabrication of thin GaN membranes. In particular, we report on traditional ...
  • Renormalization of the Coulomb Law in an Amorphous System of Metallic Nanospheres and Its Impact on the Electronic Subsystem 
    SERGENTU, V. V.; URSAKI, V. V.; TIGINYANU, I. M. (American Scientific Publishers, 2014)
    We demonstrate relations between the renormalization of the Coulomb interaction in a disordered system of metallic nanospheres and the changes induced by this renormalization in the spectrum of the electronic subsystem of ...
  • Mott type electrical conductivity in ZnSXSe1-x thin films 
    POPA, Mihail; TIGINYANU, Ion; URSAKI, Veacheslav (Romanian Academy Publishing House, 2017)
    Thin ZnSxSe1-x films on glass substrates have been obtained by thermal evaporation. Electrodes from In or other materials have been deposited on thin films, and the temperature dependence of electrical conductivity was ...

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