Yazar "Mouffak, Z." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    The low resistive and transparent Al-doped SnO2 films: p-type conductivity, nanostructures and photoluminescence
    (ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND, 2014) Benouis, CE; Benhaliliba, M; Mouffak, Z.; Avila-Garcia, A.; Tiburcio-Silver, A.; Lopez, M. Ortega; Trujillo, R. Romano; Ocak, Y. S.
    In this work, we study the crystalline structure, surface morphology, transmittance, optical bandgap and n/p type inversion of tin oxide (SnO2). The Nanostructured films of Al-doped SnO2 were successfully produced onto ITO-coated glass substrates via the spray pyrolysis method at a deposition temperature of 300 degrees C. A (101) and (211)-oriented tetragonal crystal structure was confirmed by X-ray patterns; and grain sizes varied within the range 8 42 nm. The films were polycrystalline, showing a high transparency in the visible (VIS) and infrared (IR) spectra. The optical bandgap was estimated to be around 3.4 eV. The atomic force microscopy (AFM) analysis showed the nanostructures consisting of nanotips, nanopatches, nanopits and nanobubbles. The samples exhibited high conductivity that ranged from 0.55 to 10(4) (S/cm) at ambient and showed an inversion from n to p-type as well as a degenerate semiconductor characters with a bulk concentration reaching 1.7 x 10(19) cm (3). The photoluminescence measurements reveal the detection of violet, green and yellow emissions. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Preparation and characterization of nanostructures of in-doped ZnO films deposited by chemically spray pyrolysis: Effect of substrate temperatures
    (Academic Press Ltd- Elsevier Science Ltd, 2013) Benhaliliba, M.; Benouis, C. E.; Mouffak, Z.; Ocak, Y. S.; Tiburcio-Silver, A.; Aida, M. S.; Garcia, A. A.
    We deposited undoped (ZnO) and indium-doped ZnO (IZO) films onto glass substrate via ultrasonic spray pyrolysis technique. The variation in structural, surface morphology, electrical, optical and photoluminescent properties as a function of substrate temperature is investigated. X-rays pattern confirms that as-synthesized IZO phase is grown along a (002) preferential plane. Nanosized grains (<50 nm) are determined by X-ray analysis. Morphology of as-grown films shows broadened nanostructures which have grown along c-axis and nanostructures are found to be smooth (RMS similar to 60 nm). Study by spectrophotometer reveals that the asgrown films are highly transparent in the visible and IR spectra (T similar to 88%), and that the bandgap is slightly narrowed (3.17 eV). Electrical measurements confirm the enhancement of conductivity, rho<1 Omega cm, due to indium incorporation into the starting solution. An electron concentration of 10(17) cm(-3) and a mobility of 3 cm(2)/Vs are found for IZO films grown at 400 degrees C. The photoluminescence analysis demonstrates strong yellow (2.1 eV) and blue (2.8 eV) light and weak green (2.3 eV) emissions. (C) 2013 Elsevier Ltd. All rights reserved.