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Your search keyword '"V. Caubet-Hilloutou"' showing total 7 results
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7 results on '"V. Caubet-Hilloutou"'

1. On the charge transport mechanisms in Ge-rich GeSbTe alloys

Author

Jeremie Grisolia, Daniel Benoit, V. Caubet-Hilloutou, Y. Le Friec, Alain Claverie, Maxime Vallet, Adrien Bourgine, Laboratoire de physique et chimie des nano-objets (LPCNO), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), STMicroelectronics [Crolles] (ST-CROLLES), Matériaux et dispositifs pour l'Electronique et le Magnétisme (CEMES-MEM), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
Materials science, 02 engineering and technology, GeSbTe, 01 natural sciences, chemistry.chemical_compound, 0103 physical sciences, Materials Chemistry, characterization, electron transport, Electrical and Electronic Engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Ohmic contact, Electrical conductor, 010302 applied physics, Resistive touchscreen, impedance spectroscopy, Condensed matter physics, business.industry, Doping, modeling, 021001 nanoscience & nanotechnology, Condensed Matter Physics, GeSbTe alloys, Electronic, Optical and Magnetic Materials, Amorphous solid, Phase-change memory, phase change memory, Semiconductor, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, business
Abstract

International audience; Ge-rich GeSbTe (GST) alloys are attracting Phase Change Materials for future memories as their higher crystallization temperature offers an extended range of applications. We have studied the electrical characteristics of PCM cells using such alloys as active layers. We show by impedance spectroscopy that the cells in the RESET (amorphous) state are not only resistive but also exhibit a capacitive component. Although trap-assisted conduction models are apparently able to describe the I(V) and I(T) characteristics of the devices in this state, their physical background is thus questionable. Alternatively, we show that granular models, describing electrical transport through conductive grains separated by insulating interfaces, are also able to simulate these characteristics, while fed by physically sound fitting parameters. Moreover, we show that the SET (crystalline) state is not simply ohmic but that its characteristics, as conductive as a metal but reacting as an insulator to temperature, resemble to those found in a semiconductor doped with a very low ionization energy defect. Finally, all these characteristics can be understood by considering that the electrical properties of cells made of Ge-rich GST layers are not those characteristic of some defective and homogeneous material but instead result from strong chemical heterogeneities found both in the amorphous and crystalline states of these Ge-rich alloys.

Published
2020
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2. Fabry–Pérot lineshape analysis in an optically thick expanding plasma

Author

Ewa Pawelec, V Caubet-Hilloutou, and Stéphane Mazouffre

Subjects
Jet (fluid), Chemistry, Plasma parameters, Physics::Space Physics, Plasma parameter, Plasma diagnostics, Radius, Plasma, Atomic physics, Condensed Matter Physics, Absorption (electromagnetic radiation), Spectral line
Abstract

In this work the authors present Fabry–Perot measurements of Ar atom spectral line profiles originating from the expansion of an Ar–N2 thermal plasma into a low pressure environment. The plasma is characterized by strong density, temperature and velocity gradients and it offers a high degree of light absorption for some gas mixtures. First, it is demonstrated that the Abel inversion method cannot be applied under such conditions even if absorption is absent. Second, two approaches are examined to obtain plasma parameters in the case of an optically thick expanding plasma. It is shown that velocity and temperature development along the jet radius can be inferred from experimental lineshapes when radiation production and absorption are taken into account in the core and in the surroundings of the jet.

Published
2007
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3. Electric discharge plasmas influence attachment of cultured CHO k1 cells

Author

Dick W. Slaaf, V. Caubet-Hilloutou, Eva Stoffels, Frans C. S. Ramaekers, I.E. Kieft, Jos L. V. Broers, Elementary Processes in Gas Discharges, Orthopaedic Biomechanics, and Soft Tissue Biomech. & Tissue Eng.

Subjects
Physiology, Cell Survival, Radio Waves, Confocal, Biophysics, Atmospheric-pressure plasma, CHO Cells, Cell Communication, chemistry.chemical_compound, Optics, Cricetulus, Coated Materials, Biocompatible, Electricity, Cricetinae, Microscopy, Cell Adhesion, Animals, Radiology, Nuclear Medicine and imaging, Viability assay, Propidium iodide, Microscopy, Confocal, Equipment Safety, Chemistry, business.industry, Chinese hamster ovary cell, General Medicine, Plasma, Equipment Design, Needles, Electric discharge, Gases, business
Abstract

Non-thermal plasmas can be generated by electric discharges in gases. These plasmas are reactive media, capable of superficial treatment of various materials. A novel non-thermal atmospheric plasma source (plasma needle) has been developed and tested. Plasma appears at the end of a metal pin as a submillimetre glow. We investigate the possibility of applying the plasma needle directly to living tissues; the final goal is controlled cell treatment in microsurgery. To resolve plasma effects on cells, we study cultured Chinese hamster ovarian cells (CHO-K1) as a model system. When these are exposed to the plasma, instantaneous detachment of cells from the surface and loss of cell-cell interaction is observed. This occurs in the power range 0.1-0.2 W. Cell viability is assessed using propidium iodide (PI) and cell tracker green (CTG) fluorescent staining utilizing confocal laser scanning microscopy (CLSM). Detached cells remain alive. Use of higher doses (plasma power >0.2 W) results in cell necrosis. In all cases, plasma-influenced cells are strictly localized in submillimetre areas, while no reaction in surrounding cells is observed. Due to its extreme precision, plasma treatment may be applicable in refined tissue modification. Bioelectromagnetics 25:362-368, 2004. © 2004 Wiley-Liss, Inc.

Published
2004
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4. Characterization and impact of reduced copper plating overburden on 45 nm interconnect performances

Author

P. Vannier, Ph. Normandon, E. Petitprez, V. Caubet-Hilloutou, J. Guillan, K. Haxaire, D. Bellet, M. Mellier, P. Caubet, O. Dubreuil, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), STMicroelectronics [Crolles] (ST-CROLLES), Laboratoire Interdisciplinaire Solidarités, Sociétés, Territoires (LISST), École des hautes études en sciences sociales (EHESS)-Université Toulouse - Jean Jaurès (UT2J)-École Nationale Supérieure de Formation de l'Enseignement Agricole de Toulouse-Auzeville (ENSFEA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des matériaux et du génie physique (LMGP ), Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), École des hautes études en sciences sociales (EHESS)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-École Nationale Supérieure de Formation de l'Enseignement Agricole de Toulouse-Auzeville (ENSFEA)-Centre National de la Recherche Scientifique (CNRS), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Annealing (metallurgy), Copper interconnect, Polishing, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, Chemical-mechanical planarization, 0103 physical sciences, Copper plating, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Metallurgy, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Copper, Atomic and Molecular Physics, and Optics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Grain growth, Overburden, chemistry, 13. Climate action, 0210 nano-technology
Abstract

During first metal level interconnects fabrication, a controlled modification of the electro-deposited copper over-deposition (overburden) is performed using a partial chemical-mechanical polishing (CMP) step. Next, copper microstructure is stabilized with a short duration hot-plate anneal. Overburden is then removed during CMP end-of-step. Ionic microscopy and EBSD observations of overburden thickness reduction reveal that copper grain growth occurs differently, according to patterned geometries and with a strong texture, as observed in modified films. Reduction of overburden thickness also reveals the capacity of anneal temperature to impact electrical performances. Reliability is impacted for thinnest wires.

Published
2010
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5. Examination of the shock wave regular reflexion phenomenon in a rarefied supersonic plasma flow

Author

V. Caubet-Hilloutou, Stéphane Mazouffre, Ewa Pawelec, and J. C. Lengrand

Subjects
Shock wave, Physics, Jet (fluid), business.industry, Nozzle, Mechanics, Condensed Matter Physics, Physics::Fluid Dynamics, Optics, Flow velocity, Shock diamond, Oblique shock, Supersonic speed, business, Choked flow
Abstract

The flow properties of a low-pressure weakly ionized supersonic argon plasma jet are examined using Fabry–Perot interferometry and laser induced fluorescence spectroscopy. The flow velocity and equilibrium temperature measured at the torch nozzle exit are in close agreement with computational fluid dynamics calculations. The model also predicts the plasma flow to be in a rarefied regime. Departure from thermal equilibrium is indeed observed behind the nozzle where the parallel temperature differs significantly from the perpendicular temperature. The development of the axial velocity component along the jet center stream line reveals the occurrence of the shock wave regular reflexion phenomenon: No Mach disk is formed and the flow experiences successive supersonic-to-supersonic transitions before reaching a subsonic regime. Shock wave regular reflexion is in fact favored under our experimental conditions since the speed ratio is high and the rarefaction degree is pronounced at the nozzle exit.

Published
2005
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7. Electric discharge plasmas influence attachment of cultured CHO K1 cells.

Author

Kieft IE, Broers JL, Caubet-Hilloutou V, Slaaf DW, Ramaekers FC, and Stoffels E

Subjects
Animals, Cell Adhesion physiology, Cell Communication, Cell Survival, Cricetinae, Cricetulus, Equipment Design, Equipment Safety, Gases chemistry, Microscopy, Confocal, Radio Waves, CHO Cells cytology, Coated Materials, Biocompatible chemistry, Electricity, Needles
Abstract

Non-thermal plasmas can be generated by electric discharges in gases. These plasmas are reactive media, capable of superficial treatment of various materials. A novel non-thermal atmospheric plasma source (plasma needle) has been developed and tested. Plasma appears at the end of a metal pin as a submillimetre glow. We investigate the possibility of applying the plasma needle directly to living tissues; the final goal is controlled cell treatment in microsurgery. To resolve plasma effects on cells, we study cultured Chinese hamster ovarian cells (CHO-K1) as a model system. When these are exposed to the plasma, instantaneous detachment of cells from the surface and loss of cell-cell interaction is observed. This occurs in the power range 0.1-0.2 W. Cell viability is assessed using propidium iodide (PI) and cell tracker green (CTG) fluorescent staining utilizing confocal laser scanning microscopy (CLSM). Detached cells remain alive. Use of higher doses (plasma power >0.2 W) results in cell necrosis. In all cases, plasma-influenced cells are strictly localized in submillimetre areas, while no reaction in surrounding cells is observed. Due to its extreme precision, plasma treatment may be applicable in refined tissue modification., (Copyright 2004 Wiley-Liss, Inc.)

Published
2004
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