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SYNTHÈSE ET MAÎTRISE DE LA CROISSANCE DE NANOCRISTAUX : APPLICATIONS AUX COMPOSANTS A BASE DE SEMI-CONDUCTEURS A GRANDE BANDE INTERDITE

Abstract : The objective of this work was to grow, study & control the properties of ZnO thin films & nanostructures. Three growth processes were studied: Metal-Organic Chemical Vapour Deposition (MOCVD), Pulsed Laser Deposition (PLD) & Physical Vapour Transport (PVT). The substrates used were: c-Al2O3; Si, ZnO, steel, mylar & paper. The ZnO was characterized using scanning electron microscopy, photoluminescence , cathodoluminescence , X-ray diffraction & optical reflectivity. A very wide range of ZnO nanostructures was observed, including nanorods, nanoneedles, nanocombs & some novel structures. Self-forming arrays of vertically aligned nanostructures (moth-eye nanocones & nanocolumns (vertical & broadening)) could be obtained by PLD without the use of a catalyst. The various characterisation techniques indicated that these arrays were significantly better crystallized & more highly oriented than those grown by PVT/MOCVD. The feasibility of devices was also demonstrated. A nanoLED (n-nanoZnO/p-Si) had a rectifying I/V characteristic & gave blue/white electroluminescence. Moth-eye coatings on Si, resembling black-silicon, were used as templates for the growth of GaN by MOCVD. Angular-dependent specular reflection indicated that the GaN/ZnO nanostructures were broadband antireflection coatings with < 1% reflection over the visible spectrum for incidence angles < 60°. A back-gate geometry ZnO/Si3N4/SiO2/Si transparent thin film transistor was fabricated. It demonstrated a rectifying transfer characteristic, hard saturation & enhancement mode operation. Id was in the mA range & the VON was ~ 0V. Finally, conductive Amorphous Oxide Semiconductor ZnO was grown at RT on paper & mylar.
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Contributor : Eric Vinod Sandana <>
Submitted on : Monday, November 14, 2011 - 3:19:46 PM
Last modification on : Friday, October 23, 2020 - 4:50:59 PM
Long-term archiving on: : Friday, November 16, 2012 - 10:50:10 AM

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Eric Vinod Sandana. SYNTHÈSE ET MAÎTRISE DE LA CROISSANCE DE NANOCRISTAUX : APPLICATIONS AUX COMPOSANTS A BASE DE SEMI-CONDUCTEURS A GRANDE BANDE INTERDITE. Science des matériaux [cond-mat.mtrl-sci]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00640652⟩

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