[hal-01965013] Damage creation in porous silicon irradiated by swift heavy ions
24 décembre 2018
[...]
[hal-01307100] Multicharacterization approach for studying InAl(Ga)N/Al(Ga)N/GaN heterostructures for high electron mobility transistors
5 juin 2018
We report on our multi–pronged approach to understand the structural and electrical properties of an InAl(Ga)N(33nm barrier)/Al(Ga)N(1nm interlayer)/GaN(3μm)/ AlN(100nm)/Al2O3 high electron mobility transistor (HEMT) heterostructure grown by metal organic vapor phase epitaxy (MOVPE). In (...)
[hal-01774283] Influence of ionic organization on current blockade induced by translocation of small macromolecule through a single nanopore
23 avril 2018
Single macromolecule detection through a single nanopore is based on resistive pulse technique. Typically, the ionic current is recorded. However at the nanometer scale it cannot be considered bulk like. Our main goal will be to emphasis the importance of the ion structuration (i) around the (...)
[hal-01633480] Direct imaging of rare-earth ion clusters in Yb : CaF 2
13 novembre 2017
The existence and the identification of only one or several coparticipating luminescent Yb 3+ centers in the heavily doped Yb:CaF 2 laser crystals which are considered in the development of several high intensity laser chains have been examined first by using two complementary and original (...)
[hal-01612395] Mode-locked Nd-doped fiber laser at 930 nm
6 octobre 2017
We report on a passively mode-locked neodymium-doped oscillator featuring a W-type fiber operating at 930 nm. Two different laser configurations with and without dispersion management are investigated to generate high-energy similaritons. Chirped pulses with 2.2 nJ energy that can be compressed (...)
[hal-01612388] Experimental characterization of the excitation state of picosecond laser-induced Tungsten plasmas
6 octobre 2017
In order to quantitatively determine the retention of light atoms by plasma facing components (mainly tungsten) used in fusion reactors, the Laser-Induced Breakdown Spectroscopy (LIBS) technique can be used. The nanosecond laser regimes classically used for LIBS present major limitations mainly (...)
[hal-01490322] Damage creation in porous silicon irradiated by swift heavy ions
15 mars 2017
no abstract
[hal-01490306] Silicon CMOS Compatible Transition Metal Dioxide Technology for Boosting Highly Integrated Photonic Devices with Disruptive Performance
15 mars 2017
In this work we will present the objectives and last results of the FP7-ICT-2013-11-619456 SITOGA project. The SITOGA project will address the integration of transition metal dioxides (TMO) materials in silicon photonics and CMOS electronics. TMOs have unique electro-optical properties that (...)
[hal-01489817] Slot waveguide electro-optic modulator based on ferroelectric oxides BaTiO3
14 mars 2017
no abstract
[hal-00956213] Analysis of carrier injection in Si nanoparticle-SiOx film based MOS devices
6 janvier 2017
The electrical properties of silicon rich oxide (SRO) layers integrated in metal-oxide-semiconductor device are analysed. The layers are deposited using the magnetron co-sputtering of a pure SiO2 and Si targets under a pure argon plasma. Each SRO layer embedding silicon nanoparticles (...)
[hal-01011940] Magnetic nanoconstrictions made from nickel electrodeposition in polymeric bi-conical tracks : Magneto-transport behavior
7 octobre 2016
Single nanoconstriction per magnetic wire is obtained by bi-conical track etching and electrodeposition. Magnetoresistance measurements at various angles result in irreversible jumps. Resulting jumps of magnetization have been attributed to the pinning and depinning of a constrained magnetic (...)
[hal-01375893] Yb:CaF2 : thermal effects in diode pumped high power multipass amplifiers (poster)
3 octobre 2016
Thermal and spectroscopic parameters suggest Yb-doped materials and in particular Yb:CaF 2 to be a good choice for diode pumped high power lasers [1-4]. In the frame of the Cilex-Apollon 10PW project we are developing new OPCPA pump sources based on those crystals [5]. We are presenting the (...)
[hal-01371592] Pumping Yb-doped bulk materials with 976 nm fiber lasers (orale)
26 septembre 2016
Advanced Solid State Lasers (ASSL) © OSA 2014 Fig. 1: Rayleigh range for Optical pumping with low brightness (left) and High brightness (right) Abstract: The exceptional brightness of an Yb fiber pump laser allows to measure unexpectedly high gain in Yb amplifiers, achieve pure Kerr-lens (...)
[hal-01101849] Growth of Ca2MnO4 Ruddlesden-Popper structured thin films using Combinatorial Substrate Epitaxy
27 juillet 2016
The local epitaxial growth of pulsed laser deposited Ca$_2$MnO$_4$ films on polycrystalline spark plasma sintered Sr$_2$TiO$_4$ substrates was investigated to determine phase formation and preferred epitaxial orientation relationships ($ORs$) for isostructural Ruddlesden-Popper (RP) (...)
[hal-01307100] Multicharacterization approach for studying InAl(Ga)N/Al(Ga)N/GaN heterostructures for high electron mobility transistors
26 avril 2016
We report on our multi–pronged approach to understand the structural and electrical properties of an InAl(Ga)N(33nm barrier)/Al(Ga)N(1nm interlayer)/GaN(3μm)/ AlN(100nm)/Al2O3 high electron mobility transistor (HEMT) heterostructure grown by metal organic vapor phase epitaxy (MOVPE). In (...)
[cea-01296637] First observation of HO˙ reactivity in water under high energy ions at elevated temperature
2 avril 2016
This communication reports the first observation of the formation of HO˙ produced under two different High energy ion beams, 18O8+ and 36Ar18+ having Linear Energy Transfers (LET) of 65 and 350 eV nm−1 respectively, at temperatures up to 411 K. Both scavenging with various concentrations of SCN− (...)
[cea-01271006] Comparison of UV and high-energy ion irradiation of methanol:ammonia ice
14 mars 2016
Aims. The main goal of this work is to compare the effects induced in ices of astrophysical relevance by high-energy ions, simulating cosmic rays, and by vacuum ultraviolet (UV) photons.Methods. This comparison relies on in situ infrared spectroscopy of irradiated CH3OH:NH3 ice. Swift heavy (...)
[hal-01011940] Magnetic nanoconstrictions made from nickel electrodeposition in polymeric bi-conical tracks : Magneto-transport behavior
7 décembre 2015
In a cylindrical magnetic nanowire, a magnetic domain wall (DW) can move along the wire when an applied magnetic field or a spin-polarized current is applied. We show that in a magnetic device composed of two conical nanowires connected by a nanosized constriction, a DW can be trapped and (...)
[hal-01084019] Glancing incidence diffraction as a non-destructive tool to improve functional and structural systems for future nuclear applications.
2 décembre 2015
There is a steadily growing interest in nanostructured coatings, layers and thin films consisting of increasingly complex compounds for their unique structural and functional properties that can be applied to future nuclear technologies. If composition and strain engineering at the nanometer (...)
[in2p3-01235746] Swift heavy ion modifications of astrophysical water ice
30 novembre 2015
In the relatively shielded environments provided by interstellar dense clouds in our Galaxy, infrared astronomical observations have early revealed the presence of low temperature (10–100 K) ice mantles covering tiny grain ‘‘cores” composed of more refractory material. These ices are of specific (...)
[hal-01149661] Characterization and modeling of Schottky diodes based on bulk GaN unintentionally doped
17 novembre 2015
In this paper, we have studied Au/n-GaN Schottky diodes. The substrates are realized on bulk GaN.The current-voltage (I-V) and capacitance–voltage (C–V) of Au/n-GaN structures were investigated at roomtemperature. The electrical parameters such as saturation current I0 (1.98 ×10−7 A), ideality (...)
[hal-01225789] Quantum and classical non-adiabatic dynamics of Li2+-Ne photodissociation
6 novembre 2015
The 3D photodissociation dynamics of Li$_2^+$Ne system is investigated by quantum calculations using the multi-configuration time-dependent Hartree (MCTDH) method and by classical simulations with the trajectory surface hopping (TSH) approach. Six electronic states of A' symmetry and two states (...)
[hal-01222067] Diode-pumped Yb:CaF 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation
30 octobre 2015
The dynamic thermal issues of the Yb:CaF 2 crystals within a multi-tens-mJ-energy multipass amplifier operating in the 20–100 Hz repetition rate range and pumped in quasi-cw regime have been studied at different timescales. Thermal response times of the system have been precisely investigated (...)
[hal-01222057] High repetition rate Yb:CaF2 multipass amplifiers operating in the 100 mJ range
29 octobre 2015
— We present the research advances on the development of 50-200 mJ energy range diode-pumped Yb:CaF 2-based multipass amplifiers operating at relatively high repetition rates. These laser amplifiers are based on diverse innovative geometries. All these innovations aim to design compact, stable (...)
[hal-01218026] The Revised Pole Model and New Observations of Triton
20 octobre 2015
We used 3108 Earth-based astrometric observations from the Natural Satellite Data Center (NSDC) over more than 30 years time span from 1975 to 2006 for determining the epoch state vectors of the Neptunes largest satellite Triton. In integrating the perturbation equation, the barycentric frame (...)
[hal-01215252] Interaction of slow highly charged ions with hard dental tissue : studies of fluoride uptake and reminalization efficacy
13 octobre 2015
TOF-SIMS mass spectroscopy data are presented on ion irradiation of hard dental tissue using a beam of Xe-129(20+) (15 kV) ions delivered in the ARIBE facility by an ECR source. The investigation was focused on the mass distribution of the fragment ions. A comparison is made between the mass (...)
[hal-01215250] Nonstatistical fragmentation of large molecules
13 octobre 2015
We present experimental evidence for the dominance of prompt single-atom knockout in fragmenting collisions between large polycyclic aromatic hydrocarbon cations and He atoms at center-of-mass energies close to 100 eV. Such nonstatistical processes are shown to give highly reactive fragments. (...)
[hal-01215244] Formation dynamics of fullerene dimers C-118(+), C-119(+), and C-120(+)
13 octobre 2015
Dumbbell-shaped fullerene dimers C-118(+) and C-119(+) have recently been observed in mass spectra resulting from collisions between clusters of C-60 molecules and keV He2+ or Ar2+ ions [H. Zettergren et al., Phys. Rev. Lett. 110, 185501 (2013) and F. Seitz et al., J. Chem. Phys. 139, 034309 (...)
[hal-01215242] Absolute fragmentation cross sections in atom-molecule collisions : Scaling laws for non-statistical fragmentation of polycyclic aromatic hydrocarbon molecules
13 octobre 2015
We present scaling laws for absolute cross sections for non-statistical fragmentation in collisions between Polycyclic Aromatic Hydrocarbons (PAH/PAH(+)) and hydrogen or helium atoms with kinetic energies ranging from 50 eV to 10 keV. Further, we calculate the total fragmentation cross sections (...)
[hal-01215239] Stability of the glycine cation in the gas phase after interaction with multiply charged ions
13 octobre 2015
This study presents a coupled experimental and theoretical work on the stability of singly charged glycine molecules (NH2CH2COOH+, the simplest amino acid) produced in the collision of neutral glycine with low-energy multiply charged ions in the gas phase. The main fragments observed (...)
[hal-01215234] Multiple electron capture, excitation, and fragmentation in C6+−C60 collisions
13 octobre 2015
We present experimental and theoretical results on single- and multiple-electron capture, and fragmentation, in C6+ + C-60 collisions at velocities in the v(col) = 0.05 - 0.4 a.u. range. We use time-of-flight mass spectrometry and coincidence detection of charged fragments to separate pure (...)
[hal-01215195] Fragmentation of anthracene C14H10, acridine C13H9N and phenazine C12H8N2 ions in collisions with atoms
13 octobre 2015
We report experimental total, absolute, fragmentation cross sections for anthracene C14H10, acridine C13H9N, and phenazine C12H8N2 ions colliding with He at center-of-mass energies close to 100 eV. In addition, we report results for the same ions colliding with Ne, Ar, and Xe at higher (...)
[hal-01084494] A collision process responsible for widespread formation of H anions
11 septembre 2015
[...]
[hal-01056252] PR3+-Doped ZBLA Channel Waveguides for Visible Laser Emission
11 septembre 2015
[...]
[hal-01059835] InAs/AlGaSb Esaki tunnel diodes grown by selective area epitaxy on GaSb (001) substrate
11 septembre 2015
We report on the realization of AlGaSb/InAs Esaki tunnel diodes on GaSb (001) substrate. Selective area molecular beam epitaxy of InAs is used to define the area of the diodes down to submicron dimensions. A peak current density up to 1.3 MA/cm2 is (...)
[in2p3-01026451] Friction and wear properties modification of Ti-6Al-4V alloy surfaces by implantation of multi-charged carbon ions
30 juillet 2015
Carbon implantation into titanium is known to enhance some of its surface properties like wear behavior, mechanical hardness or the friction coefficient. Therefore the method is a candidate to be applied as a powerful surface engineering tool for titanium alloys. Recently, a new implantation (...)
[in2p3-01179076] Precision measurements with LPCTrap at GANIL
23 juillet 2015
The experimental achievements and the results obtained so far with the LPCTrap device installed at GANIL are presented. The apparatus is dedicated to the study of the weak interaction at low energy by means of precise measurements of the – angular correlation parameter in nuclear decays. So (...)
[tel-01074592] Stabilité de systèmes complexes d’intérêt biologique sous rayonnements ionisants.
10 juillet 2015
Ce travail de thèse présente l’étude de la stabilité de systèmes moléculaires d’intérêt biologique en phase gazeuse suite à l’interaction avec des rayonnements ionisants. L’utilisation des rayonnements ionisants permet de sonder la physico-chimie des systèmes complexes à l’échelle moléculaire et ainsi (...)
[hal-01170843] Non-statistical fragmentation of PAHs and fullerenes in collisions with atoms
2 juillet 2015
Non-statistical fragmentation processes may be important when Polycyclic Aromatic Hydrocarbon molecules (PAHs), fullerenes, or other large complex molecules collide with atoms and atomic ions. For collisions with hydrogen or helium this occurs for center-of-mass energies between a few tens to a (...)
[hal-01170833] Ions colliding with mixed clusters of C60 and coronene : Fragmentation and bond formation
2 juillet 2015
We have studied collisions between 22.5 keV He2+ ions and mixed clusters [(C60)m(C24H12)n] of m C60 and n coronene molecules where m and n range up to about ten. Surprisingly, the cluster fragmentation behavior in distant collisions is dramatically different for pure coronene clusters (m=0) and (...)
[in2p3-01104281] Using GPU parallelization to perform realistic simulations of the LPCTrap experiments
30 juin 2015
The LPCTrap setup is a sensitive tool to measure the β − ν angular correlation coefficient, a β ν , which can yield the mixing ratio ρ of a β decay transition. The latter enables the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element V u d . In such a measurement, the most relevant (...)
[in2p3-00989772] Atomic site sensitive processes in low energy ion-dimer collisions
30 juin 2015
Electron capture processes for low energy Ar9+ ions colliding on Ar2 dimer targets are investigated, focusing attention on charge sharing as a function of molecule orientation and impact parameter. A preference in charge-asymmetric dissociation channels is observed, with a strong correlation (...)
[hal-01161303] Charge Trapping in Hafnium Silicate Films with Modulated Composition and Enhanced Permittivity
25 juin 2015
Hafnium silicate dielectric films were fabricated by radio frequency magnetron sputtering. Their microstructure and electrical properties were studied versus annealing treatment. The evolution of microstructure and the formation of alternated HfO2-rich and SiO2-rich layers were observed and (...)
[hal-01163403] Composition of Wide Bandgap Semiconductor Materials and Nanostructures Measured by Atom Probe Tomography and Its Dependence on the Surface Electric Field
25 juin 2015
Atom probe tomography allows for three-dimensional reconstruction of the elemental distribution in materials at the nanoscale. However, the measurement of the chemical composition of compound semiconductors may exhibit strong biases depending on the experimental parameters used. This article (...)
[hal-00977777] Structural characterisation of BaTiO3 thin films deposited on SrRuO3/YSZ buffered silicon substrates and silicon microcantilevers
23 juin 2015
We report on the progress towards an all epitaxial oxide layer technology on silicon substrates for epitaxial piezoelectric microelectromechanical systems. (101)-oriented epitaxial tetragonal BaTiO3 (BTO) thin films were deposited at two different oxygen pressures, 5.10 2 mbar and 5.10 3 mbar, (...)
[insu-01163387] Petrological mapping of a Low Velocity Zone (LVZ) induced by CO2-H2O-bearing incipient melts
18 juin 2015
The link between volatiles and mantle melting has so far been illuminated by experiments, revealing that ppm concentration levels of carbon and other volatiles in the Earth’s mantle induce partial melting. Pressure-temperature conditions of incipient melting for CO2-H2O-peridotite [1] match (...)
[insu-01163386] Electrical Conductivity of H2O-CO2 rich-Melt at mantle conditions : interpretation of the LAB using petrology-based 1D conductivity profiles
17 juin 2015
Electromagnetic data images mantle regions more conductive than that of dry olivine. There is no doubt that melt is thermodynamically stable and present in the LAB, but how they can impact on mantle electrical conductivity remains debated. In addition, gravitational segregation and fast melt (...)
[insu-01163371] Melt Connectivity and Its Effect on Grain Growth in Natural Olivine Aggregates : An Experimental Study
17 juin 2015
To better constrain the rheology of the mantle, experimental studies on olivine grain growth have been conducted (Faul and Scott, 2006; Karato, 1989; Nichols and Mackwell, 1991) since the grain size is an important parameter under dynamic regimes (e.g. diffusion creep and grain boundary (...)
[hal-01149674] Synthesis and characterization of thermally evaporated Cu2SnSe3 ternary semiconductor
16 juin 2015
Copper Tin Selenide (CuSnSe) powder was mechanically alloyed by high energy planetary ball milling, starting from elemental powders. Synthesis time and velocity have been optimized to produce Cu2SnSe3 materials. Thin films were prepared by thermal evaporation on Corning glass substrate at Ts = (...)
[hal-01149623] Energy transfer mechanism between terbium and europium ions in zinc oxide and zinc silicates thin films
16 juin 2015
The aim of this study is to enhance europium ions emission by energy transfer mechanism from terbium to europiumions in codoped ZnO thin films. The samples were annealedwith classical and rapid thermal anneal treatments for different temperatures (973 K, 1173 K and 1373 K). Codoped ZnO thin (...)
[hal-01149627] Concentration determination and activation of rare earth dopants in zinc oxide thin films
16 juin 2015
In this paper, we will present the development of rareearth (RE) doped zinc oxide (ZnO) films for white light emitting diodes (LED). We will present the structural changes of these films as well as their optical properties and associated photoluminescence before and after rapid thermal (...)
[hal-01149661] Characterization and modeling of Schottky diodes based on bulk GaN unintentionally doped
16 juin 2015
In this paper, we have studied Au/n-GaN Schottky diodes. The substrates are realized on bulk GaN. The current-voltage (I-V) and capacitance–voltage (C–V) of Au/n-GaN structures were investigated at room temperature. The electrical parameters such as saturation current I0 (1.98 ×10−7 A), ideality (...)
[hal-00956213] Analysis of carrier injection in Si nanoparticle-SiOx film based MOS devices
15 juin 2015
The electrical properties of silicon rich oxide (SRO) layers integrated in metal-oxide-semiconductor device are analysed. The layers are deposited using the magnetron co-sputtering of a pure SiO2 and Si targets under a pure argon plasma. Each SRO layer embedding silicon nanoparticles (...)
[hal-01150456] Zn incorporation in CuInSe2 : Particle size and strain effects on microstructural and electrical properties
9 juin 2015
Incorporation of the doping element Zn in the temperature range (550–700 °C) and the impact on structural and electrical properties of CuInSe2 material are investigated. X-ray diffraction patterns showed the chalcopyrite nature of the pure and doped CuInSe2 and revealed that diffusion temperature (...)
[hal-01150454] Formation and Study of the Nanostructured CuAl0.5Ga0.5Te2 Synthesized by Mechanical Alloying Processing
9 juin 2015
Nanostructured chalcopyrite CuAl0.5Ga0.5Te2 has been prepared by milling a mixture of reactants, copper, aluminum, gallium, and tellurium. The crystal structure, morphology, and composition of the prepared samples have been characterized by means of x-ray diffraction (XRD), scanning electron (...)
[hal-01078616] Influence of fabrication steps on optical and electrical properties of InN thin films
28 mai 2015
This paper reports on a case study of the impact of fabrication steps on InN material properties. We discuss the influence of annealing time and sequence of device processing steps. Photoluminescence (PL), surface morphology and electrical transport (electrical resistivity and low frequency (...)
[hal-01141715] Screening sensitivity analysis of a radionuclides atmospheric dispersion model applied to the Fukushima disaster
27 mai 2015
Numerical models used to forecast the atmospheric dispersion of radionuclides following nuclear accidents are subject to substantial uncertainties. Input data, such as meteorological forecasts or source term estimations, as well as poorly known model parameters contribute for a large part to (...)
[hal-01144554] Nouvelles agroressources pour panneaux de particules 100% biosourcés
20 mai 2015
L'agriculture française propose des ressources remarquables pas ou peu exploitées et pouvant être valorisées en agromatériaux. Cette étude propose une comparaison des propriétés de panneaux de particules agglomérées réalisés à partir de différentes agroressources : le bois, la chènevotte, les anas de lin, (...)
[hal-01144555] Etude en rupture d’un composite à fibres végétales d’Alfa
20 mai 2015
Le comportement sous chargement monotone des composites renforcés par des fibres naturelles commence à être assez bien connu aujourd'hui. Cependant, le comportement à la rupture est encore mal maîtrisé. Le présent travail décrit une approche numérique développée pour simuler le mécanisme de propagation (...)
[hal-00998416] Chalcogenide optical fibers for mid-infrared sensing
20 mai 2015
Chalcogenide glasses are a matchless material as far as mid-infrared (IR) applications are concerned. They transmit light typically from 2 to 12 μm and even as far as 20 μm depending on their composition, and numerous glass compositions can be designed for optical fibers. One of the most (...)
[hal-00993306] Theoretical investigation of the more suitable rare earth to achieve high gain in waveguide based on silica containing silicon nanograins doped with either Nd3+ or Er3+ ions
20 mai 2015
We present a comparative study of the gain achievement in a waveguide whose active layer is constituted by a silica matrix containing silicon nanograins acting as sensitizer of either neodymium ions (Nd3+) or erbium ions (Er3+). By means of an auxiliary differential equation and finite (...)
[hal-01139287] Role of silicon excess in Er-doped silicon-rich nitride light emitting devices at 1.54 μm
19 mai 2015
Erbium-doped silicon-rich nitride electroluminescent thin-films emitting at 1.54 μm have been fabricated and integrated within a metal-oxide-semiconductor structure. By gradually varying the stoichiometry of the silicon nitride, we uncover the role of silicon excess on the optoelectronic (...)
[hal-01011940] Magnetic nanoconstrictions made from nickel electrodeposition in polymeric bi-conical tracks : Magneto-transport behavior
19 mai 2015
In a cylindrical magnetic nanowire, a magnetic domain wall (DW) can move along the wire when an applied magnetic field or a spin-polarized current is applied. We show that in a magnetic device composed of two conical nanowires connected by a nanosized constriction, a DW can be trapped and (...)
[insu-00987388] The electrical conductivity during incipient melting in the oceanic low-velocity zone
19 mai 2015
The low-viscosity layer in the upper mantle, the asthenosphere, is a requirement for plate tectonics1. The seismic low velocities and the high electrical conductivities of the asthenosphere are attributed either to subsolidus, water-related defects in olivine minerals2, 3, 4 or to a few volume (...)
[tel-01098780] Effets de l’irradiation par des ions lourds multichargés sur des cristaux et des glaces d’intérêt astrophysique
24 avril 2015
Le système solaire et le milieu interstellaire sont soumis en permanence à différents rayonnements tels que le vent solaire et les rayons cosmiques. L’interaction entre les particules énergétiques et les matériaux présents dans ces différents milieux (glaces, silicates et matériaux carbonés), joue un (...)
[hal-01128984] Magnetic nanoconstrictions made from nickel electrodeposition in polymeric bi-conical tracks : Magneto-transport behavior
23 avril 2015
Single nanoconstriction per magnetic wire is obtained by bi-conical track etching and electrodeposition. Magnetoresistance measurements at various angles result in irreversible jumps. Resulting jumps of magnetization have been attributed to the pinning and depinning of a constrained magnetic (...)
[tel-01142121] Elaboration et caractérisation de films de ZnO dopé pour des applications optoélectroniques
23 avril 2015
Cette thèse s’inscrit dans le cadre du développement de nouvelles DEL monolithiques à émission blanche. Des films de ZnO dopé terre(s) rare(s) et métal de transition ont été élaborés par pulvérisation magnétron radiofréquence. Un choix judicieux des paramètres de dépôt nous ont permis de mieux comprendre (...)
[hal-01138059] Annealing effects on the photoluminescence of terbium doped zinc oxide films
23 avril 2015
Zinc oxide (ZnO) is a transparent conductive oxide (TCO) material. It is integrated in many optoelectronic applications usually in thin films structures. ZnO is a well known, cheap and non-toxic material. Electrically or optically excited, it emits in the UV-blue spectral region. By Stark (...)
[hal-01078069] Spectroscopic and structural investigation of undoped and Er3+ doped hafnium silicate layers.
23 avril 2015
This paper demonstrates the functionality of radio-frequency magnetron sputtering for the fabrication of undoped and Er-doped Si-rich-HfO 2 films with specific structural and spectroscopic properties. The effect of post-deposition treatment on film properties was investigated by means of (...)
[hal-01138057] Photochemical preparation of silver nanoparticles supported on zeolite crystals
23 avril 2015
A facile and rapid photochemical method to prepare supported silver nanoparticles (Ag-NPs) in a suspension of faujasite-type (FAU) zeolite nanocrystals is described. Silver cations are introduced by ion exchange in the zeolite and subsequently irradiated with a Xe-Hg lamp (200 W) in the (...)
[insu-01097239] Toward a unified hydrous olivine electrical conductivity law
23 avril 2015
It has long been proposed that water incorporation in olivine has dramatic effects on the upper mantle properties, affecting large scale geodynamics and triggering high electrical conductivity. But the laboratory-based laws of olivine electrical conductivity predict contrasting effects of (...)
[hal-01081606] On the relevance of large scale pulsed-laser deposition : Evidence of structural heterogeneities in ZnO thin films
23 avril 2015
Pulsed-laser deposition is known as a well-suited method for growing thin films of oxide compounds presenting a wide range of functional properties. A limitation of this method for industrial process is the very anisotropic expansion dynamics of the plasma plume, which induces difficulties to (...)
[tel-01097835] Modélisation numérique de l’interaction onde-matière dans des matériaux nanostructurés à base de terres rares ou de nanoparticules métalliques pour la photonique ou la plasmonique
23 avril 2015
Ce travail de thèse est basé sur la modélisation de l'interaction onde-matière dans des matériaux nanostructurés par la méthode des différences finies dans le domaine temporel (FDTD) associée à des équations différentielles auxiliaires (ADE). Le code de calcul développé a été appliqué à deux domaines: la (...)
[hal-01101849] Growth of Ca2MnO4 Ruddlesden-Popper structured thin films using Combinatorial Substrate Epitaxy
23 avril 2015
The local epitaxial growth of pulsed laser deposited Ca$_2$MnO$_4$ films on polycrystalline spark plasma sintered Sr$_2$TiO$_4$ substrates was investigated to determine phase formation and preferred epitaxial orientation relationships ($ORs$) for isostructural Ruddlesden-Popper (RP) (...)
[hal-00992670] Influence of an interfacial AlxIn1-xSb layer on the strain relaxation and surface morphology of thin GaSb layers epitaxially grown on GaAs(001)
23 avril 2015
This work focuses on the strain relaxation and surface morphology of 10 ML thick GaSb layers on GaAs. It is shown that full relaxation is never reached for this thickness. The use of an AlSb interfacial layer only slightly improves strain relaxation but greatly reduces surface roughness. (...)