Wyniki wyszukiwania dla: A. Etcheberry

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artykuł

Photoelectrochemical deposition of ZnO films via nitrate ions reduction in the presence of thiourea on p-type Cu(In,Ga)Se₂ semiconducting electrodes for photovoltaic applications

S. Gallanti, E. Chassaing, M. Bouttemy, A. Etcheberry, więcej

Journal of Applied Electrochemistry > 2017 > 47 > 12 > 1283-1291

This work describes the electrodeposition of ZnO layers on p-type copper indium gallium diselenide [Cu(InGa)Se₂] substrates via nitrate ions reduction in the presence of thiourea. The substrate stability domain has been determined by means of cyclic voltammetry in acidic medium. The optimal deposition range has been studied in zinc nitrate electrolyte containing concentrations of thiourea between...

artykuł

Reconstruction of perfect ZnO nanowires facets with high optical quality

E. Zehani, S. Hassani, A. Lusson, J. Vigneron, więcej

Applied Surface Science > 2017 > 411 > C > 374-378

ZnO nanowires were grown on sapphire substrates using metalorganic chemical vapor deposition. The samples were subsequently annealed under zinc pressure in a vacuum-sealed ampoule, at temperature ranging from 500 to 800°C. The originality and the main motivation to provide a zinc–rich atmosphere were to prevent the out-diffusion of zinc from the nanowires. In doing so, the perfect structural properties...

artykuł

Chemical engineering of Cu(In,Ga)Se2 surfaces: An absolute deoxidation studied by X-ray photoelectron spectroscopy and Auger electron spectroscopy signatures

A. Loubat, M. Bouttemy, S. Gaiaschi, D. Aureau, więcej

Thin Solid Films > 2017 > 633 > C > 87-91

CIGS (Cu(In,Ga)Se₂) absorbers are among the most efficient for photo-conversion. As part of their manufacturing cycle, absorber surface preparation is crucial for both the success of processes and the outcome of characterizations actions. This work tackles the question of an efficient deoxidation of CIGS surfaces. Chemical composition of surface is investigated thanks to XPS (X-ray Photoelectron Spectroscopy)...

artykuł

Characterization of the surface physico-chemistry of plasticized PVC used in blood bag and infusion tubing

H. Al Salloum, J. Saunier, A. Dazzi, J. Vigneron, więcej

Materials Science and Engineering: C > 2017 > 75 > C > 317-334

Commercial infusion tubing and blood storage devices (tubing, blood and platelets bags) made of plasticized PVC were analyzed by spectroscopic, chromatographic and microscopic techniques in order to identify and quantify the additives added to the polymer (lubricants, thermal stabilizers, plasticizers) and to put into evidence their blooming onto the surface of the devices. For all the samples, deposits...

artykuł

Direct correlations between XPS analyses and growth film by chronopotentiometry on InP in liquid ammonia (−55°C)

A.-M. Gonçalves, C. Njel, D. Aureau, A. Etcheberry

Applied Surface Science > 2017 > 391 > PA > 44-48

This paper is based on the understanding of the formation of a reproducible polyphosphazene-like film ([(H₂N)PN]_n) obtained on InP by anodic treatment in liquid ammonia. The approach is innovative as it combines indications from the coulometric charges and the related chemical information from XPS analyses. Anodic charges are accurately monitored by galvanostatic treatment between 0.05mCcm⁻² and 12...

artykuł

Strontium titanate (100) surfaces monitoring by high temperature in situ ellipsometry

D. Hrabovsky, B. Berini, A. Fouchet, D. Aureau, więcej

Applied Surface Science > 2016 > 367 > C > 307-311

We report monitoring and analysis of the contamination overlayer on the surface of different SrTiO₃ (STO) substrates by in situ spectroscopic ellipsometry (SE) and ex situ X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Substrates of STO with different terminations, random and TiO₂ terminated, were heated from room temperature up to 720°C under oxygen pressure in UHV chamber...

artykuł

Advanced analysis tool for X-ray photoelectron spectroscopy profiling: Cleaning of perovskite SrTiO3 oxide surface using argon cluster ion source

D. Aureau, K. Ridier, B. Bérini, Y. Dumont, więcej

Thin Solid Films > 2016 > 601 > C > 89-92

This article shows the comparison between three different ionic bombardments during X-ray photoelectron spectroscopy (XPS) studies of single crystalline SrTiO₃ (STO) substrates. The abrasion using a “cluster argon ion source” is compared with the standard “monoatomic Ar”. The influence of the energy of the monoatomic ions used is clearly demonstrated. While the chemically adsorbed species on the STO...

artykuł

Effect of growth temperature on the electrodeposition of zinc oxide layers on diamond surfaces

P. Gautier, A. Vallee, C. Sinito, A. Etcheberry, więcej

The electrochemical deposition of ZnO layers from an oxygenated zinc chloride bath has been realized on Boron Doped Diamond films as substrate for the first time. The influence of the bath temperature has been investigated from 20°C to 80°C. Scanning Electron Microscopy, X-Ray Diffraction and X-Ray Photoelectron Spectroscopy, performed on the treated surfaces, show the influence of the bath temperature...

rozdział

Towards a better understanding of the use of additives in Zn(S,O,OH) deposition bath for high efficiency Cu(In,Ga)Se2-based solar cells

T. Hildebrandt, N. Loones, M. Bouttemy, J. Vigneron, więcej

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) > 1 - 4

2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC)

CBD-Zn(S,O,OH) remains one the most studied and promising Cd-free buffer layer for Cu(In,Ga)Se2-based solar cells, and has already demonstrated its potential to lead to high-efficiency solar cells. However Zn(S,O,OH) deposition time and metastable behavior of the final devices remain critical to outperform CdS-based devices. The aim of this work is to study and understand the influence of additives...

artykuł

Effective performances of chronoamperometry on the passivation process of n-InP in acidic liquid ammonia (-55°C)

C. Njel, A.M. Gonçalves, A. Etcheberry

Electrochimica Acta > 2014 > 139 > Complete > 152-156

Chronoamperometry has proven to be a useful in-situ technique to investigate on the anodic passivation mechanism on n-InP semiconductors in acidic liquid ammonia. From our preliminary work, we assumed that the phosphazene film results from parallel electrochemical reactions: InP dissolution and ammonia oxidation. The main question posed here was based on the involvement of bromide (Br ⁻ )...

artykuł

Determination of selectivity and specific area related to oxygen reduction reaction as a function of catalyst loading on non-noble metal based electrocatalyst porous electrodes: an example on nitrogen doped carbon nanotube

X. Cheng, X.-T. Than, M. Pinault, M. Mayne, więcej

Electrochimica Acta > 2014 > 135 > C > 293-300

In a recent paper, model porous electrodes based on carbon nanotube and platinum organically grafted electrocatalysts were used to establish the determination of a specific surface area related to oxygen reduction reaction (ORR) in HClO₄ 1M, using cyclic voltammetry as a function of scan speed. Identical behavior was found for the trends of this parameter called S-AO₂ and the selectivity of the ORR...

artykuł

Direct amination of diamond surfaces by electroless treatment in liquid ammonia solution

N. Simon, G. Charrier, A.M. Gonçalves, D. Aureau, więcej

Electrochemistry Communications > 2014 > 42 > Complete > 17-20

Diamond presents many interesting properties in terms of biocompatibility, chemical inertness and is attractive for applications notably in the biosensor field. The formation of amine functional groups at the diamond surface is of great interest for biomolecule's immobilization. In this work, we present for the first time, the “electroless” amination of diamond surfaces exposed to a liquid ammonia...

artykuł

Development of a Method for Chemical–Mechanical Preparation of the Surface of CdZnTe Substrates for HgCdTe-Based Infrared Focal-Plane Arrays

D. Pelenc, J. Merlin, A. Etcheberry, P. Ballet, więcej

Journal of Electronic Materials > 2014 > 43 > 8 > 3004-3011

This paper reports the first implementation in our laboratory of a chemical–mechanical polishing (CMP) process for CdZnTe (CZT) substrates prepared for growth of HgCdTe layers by liquid phase epitaxy and molecular beam epitaxy. The process enables significant reduction of the thickness of the damaged zone induced by the mechanical polishing that must be etched away before epitaxy. Resulting improvements...

artykuł

Electrical and Chemical Studies on Al2O3 Passivation Activation Process

M. Pawlik, J.P. Vilcot, M. Halbwax, D. Aureau, więcej

Energy Procedia > 2014 > 60 > Complete > 85-89

Al ₂ O ₃ deposited using Atomic layer Deposition (ALD) technique is known as an excellent material for p-type silicon surface passivation. However a post-deposition annealing step is needed to make the passivation effective. Thanks to coupled electrical measurements (capacitance and photoconductance) and chemical analyses (X-ray Photoelectron Spectroscopy (XPS) and Secondary Ion Mass...

artykuł

Influence of nickel–phosphorus surface roughness on wettability and pores formation in solder joints for high power electronic applications

L. Vivet, A.-L. Joudrier, K.-L. Tan, J.-M. Morelle, więcej

Applied Surface Science > 2013 > 287 > Complete > 13-21

Electroless nickel-high-phosphorus Ni–P plating is used as substrate coating in the electronic component technology. The ability to minimize pores formation in solder joints and the wettability of the Ni–P layer remain points of investigation. The qualities and the control of the physical and chemical properties of the deposits are essential for the reliability of the products. In this contribution...

artykuł

Scanning Auger microscopy for high lateral and depth elemental sensitivity

E. Martinez, P. Yadav, M. Bouttemy, O. Renault, więcej

Journal of Electron Spectroscopy and Related Phenomena > 2013 > 191 > Complete > 86-91

Scanning Auger microscopy is currently gaining interest for investigating nanostructures or thin multilayers stacks developed for nanotechnologies. New generation Auger nanoprobes combine high lateral (∼10nm), energy (0.1%) and depth (∼2nm) resolutions thus offering the possibility to analyze the elemental composition as well as the chemical state, at the nanometre scale. We report here on the performances...

artykuł

Wet etching of InSb surfaces in aqueous solutions: Controlled oxide formation

D. Aureau, R. Chaghi, I. Gerard, H. Sik, więcej

Applied Surface Science > 2013 > 276 > Complete > 182-189

This paper investigates the wet etching of InSb surfaces by two different oxidant agents: Br ₂ and H ₂ O ₂ and the consecutive oxides generation onto the surfaces. The strong dependence between the chemical composition of the etching baths and the nature of the final surface chemistry of this low band-gap III–V semiconductor will be especially highlighted. One aqueous etching...

artykuł

Phosphazene like film formation on InP in liquid ammonia (223K)

A.-M. Gonçalves, C. Njel, C. Mathieu, D. Aureau, więcej

Thin Solid Films > 2013 > 538 > Complete > 21-24

An anodic photo-galvanostatic treatment at low current density (1μA·cm ⁻² ) is carried out on n-InP semiconductor in liquid ammonia (223K). The gradual chemical evolution of the surface is studied as a function of the anodic charge. Proof and reproducibility of the chemical transformation of the surface are clearly evidenced by X-ray photoelectron spectroscopy (XPS) analyses. Like by cyclic...

artykuł

Heteroepitaxial diamond on iridium: New insights on domain formation

N. Vaissiere, S. Saada, M. Bouttemy, A. Etcheberry, więcej

Topography and chemical evolutions of the iridium surface in the successive steps of bias-enhanced nucleation and growth were investigated using scanning electron microscopy (SEM), atomic force microscopy (AFM), and nano-Auger analyses. This sequential approach, which was performed in localized areas at the nanoscale, provides three new experimental and complementary concepts that can enhance the...

artykuł

Wettability and XPS analyses of nickel–phosphorus surfaces after plasma treatment: An efficient approach for surface qualification in mechatronic processes

L. Vivet, A.-L. Joudrier, M. Bouttemy, J. Vigneron, więcej

Applied Surface Science > 2013 > 274 > Complete > 71-78

Electroless nickel-high-phosphorus Ni–P plating is known for its physical properties. In case of electronic and mechatronic assembly processes achieved under ambient conditions the wettability of the Ni–P layer under ambient temperature and ambient air stays a point of surface quality investigation. This contribution will be devoted to the study of the surface properties of Ni–P films for which we...

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European Polymer Journal (1)
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