Recherche

Afficher tous les résultats pour

Accueil

Personne

Aïcha Hessler-Wyser

Cette personne a quitté l’EPFL

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (95)

Page 4 sur 5

Redox study of anode supported solid oxide fuel cell

Jan Van Herle, Aïcha Hessler-Wyser, Antonin Faes

The common technology for solid oxide fuel cells (SOFC) is based on a cermet anode of nickel with yttrium stabilized zirconia (YSZ), often used as the supporting structure. One of the main limitations of this anode technology is the redox tolerance. In thi ...

2008

Microwave plasma-assisted reactive HiPIMS of InN films: Plasma environment and material characterisation

Aïcha Hessler-Wyser, Johann Michler, Jonathan Emanuel Thomet, Caroline Hain

This work focuses on the low temperature fabrication process of InN thin films via microwave plasma-assisted reactive high power impulse magnetron sputtering (MAR-HiPIMS). The influence of microwave plasma on the HiPIMS discharge process at various nitroge ...

ELSEVIER SCIENCE SA2022

ITO/MoOx/a-Si:H(i) Hole-Selective Contacts for Silicon Heterojunction Solar Cells: Degradation Mechanisms and Cell Integration

Christophe Ballif, Matthieu Despeisse, Aïcha Hessler-Wyser, Sylvain Nicolay, Quentin Thomas Jeangros, Antoine Descoeudres, Davide Sacchetto, Loris Barraud, Gabriel Christmann, Jonas Geissbühler

Molybdenum oxide is an efficient hole collector for silicon solar cells. However, its optoelectronic properties deteriorate during cell manufacturing. To assess this issue, the optoelectronic properties and microstructure of molybdenum oxide-based hole con ...

2017

Nickel oxide reduction studied by environmental TEM and in situ XRD

Jan Van Herle, Cécile Hébert, Aïcha Hessler-Wyser, Quentin Thomas Jeangros

2012

Energy-filtered environmental transmission electron microscopy for the assessment of solid-gas reactions at elevated temperature: NiO/YSZ-H-2 as a case study

Jan Van Herle, Cécile Hébert, Aïcha Hessler-Wyser, Quentin Thomas Jeangros

A novel approach, which is based on the analysis of sequences of images recorded using energy-filtered transmission electron microscopy and can be used to assess the reaction of a solid with a gas at elevated temperature, is illustrated for the reduction o ...

Elsevier Science Bv2016

An Indium-Free Anode for Large-Area Flexible OLEDs: Defect-Free Transparent Conductive Zinc Tin Oxide

Christophe Ballif, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Monica Morales Masis, Ali Dabirian, Fabien Paul Jacques Dauzou

Flexible large-area organic light-emitting diodes (OLEDs) require highly conductive and transparent anodes for efficient and uniform light emission. Tin-doped indium oxide (ITO) is the standard anode in industry. However, due to the scarcity of indium, alt ...

Wiley-Blackwell2016

Three-dimensional chemical analysis of laser-welded NiTi–stainless steel wires using a dual-beam FIB

Michel Rappaz, Aïcha Hessler-Wyser, Marco Cantoni, Pierre Burdet, Jonas Vannod

The biomedical industry has an increasing demand for processes to join dissimilar metals, such as laser welding of NiTi and stainless steel wires. A region of the weld close to the NiTi interface, which previously was shown to be prone to cracking, was fur ...

Elsevier2013

Cathode thickness-dependent tolerance to Cr-poisoning in solid oxide fuel cells

Jan Van Herle, Christos Comninellis, Aïcha Hessler-Wyser, Josef Andreas Schuler, Pietro Tanasini

This work aimed to set new guidelines for the quantification of Cr accumulation in solid oxide fuel cell cathodes after operation, and enabled to pinpoint a diffusion-controlled tolerance to Cr-poisoning for increased cathode thickness; the additional cath ...

Elsevier2010

Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

Jan Van Herle, Cécile Hébert, Aïcha Hessler-Wyser, Quentin Thomas Jeangros

The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O-2 between ambient temperature and 600 degrees C. Several different transmission electron microscopy imaging techniques, electron dif ...

Pergamon-Elsevier Science Ltd2014

Increasing Polycrystalline Zinc Oxide Grain Size by Control of Film Preferential Orientation

Christophe Ballif, Cécile Hébert, Aïcha Hessler-Wyser, Duncan Thomas Lindsay Alexander, Monica Morales Masis, Sylvain Nicolay, Arthur Brian Aebersold, Lorenzo Fanni

We investigate the structural evolution of polycrystalline zinc oxide films grown by low pressure metal-organic chemical vapor deposition. The goal is to achieve larger grains-leading to higher charge carrier mobility from lower grain boundary density-by c ...

American Chemical Society2015

High performance amorphous Zn-Sn-O: impact of composition, microstructure, and thermal treatments in the optoelectronic properties

Christophe Ballif, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Monica Morales Masis, Oscar Esteban Rucavado Leandro, Federica Landucci

Zinc and tin oxides are both earth-abundant materials with demonstrated applicability as electrodes in several optoelectronic devices. The presence of grain boundaries in these polycrystalline films generally limits the electron mobility. By a combinatoria ...

Spie-Int Soc Optical Engineering2017

22.5% efficient silicon heterojunction solar cell with molybdenum oxide hole collector

Christophe Ballif, Stefaan De Wolf, Aïcha Hessler-Wyser, Matthieu Despeisse, Björn Niesen, Sylvain Nicolay, Loris Barraud, Jérémie Werner, Andrea Tomasi

Substituting the doped amorphous silicon films at the front of silicon heterojunction solar cells with wide-bandgap transition metal oxides can mitigate parasitic light absorption losses. This was recently proven by replacing p-type amorphous silicon with ...

American Institute of Physics2015

Rapid chromium quantification in solid oxide fuel cell cathodes

Jan Van Herle, Aïcha Hessler-Wyser, Josef Andreas Schuler, Pietro Tanasini

The detection and quantification of small quantities of Cr in (La,Sr)MnO3/Y–ZrO2 solid oxide fuel cell (SOFC) cathodes by energy-dispersive X-ray spectroscopy (EDXS) is not straightforward as Cr X-ray emission lines overlap with La/Mn and O lines. This wor ...

Elsevier2010

Bandgap engineering of indium gallium nitride layers grown by plasma-enhanced chemical vapor deposition

Nils Toggwyler, Christophe Ballif, Franz-Josef Haug, Aïcha Hessler-Wyser, Mathieu Gérard Boccard, Nicolas Würsch, Jonathan Emanuel Thomet, Mélanie Nelly Rouèche

This paper reports on the fabrication of In xGa 1 - xN (InGaN) layers with various compositions ranging from InN to GaN using a cost-effective low-temperature plasma-enhanced chemical vapor deposition (PECVD) method and analyzes the influence of deposition ...

2022

Large Area Roll-to-Roll Texturation with Hyperbranched Polymer Nanocomposites for Light-Trapping Applications

Jan-Anders Edvin Maansson, Yves Leterrier, Aïcha Hessler-Wyser, Marina Aymara González Lazo

2011

Textured silicon heterojunction solar cells with over 700mV open-circuit voltage studied by transmission electron microscopy

Christophe Ballif, Aïcha Hessler-Wyser, Stefaan De Wolf, Christian Monachon, Luc Fesquet

In this article, we report on the use of transmission electron microscopy (TEM) for the fabrication of high-performance textured amorphous/crystalline silicon (a-Si:H/c-Si) heterojunction (HJ) solar cells. Whereas classical thin-film characterization techn ...

2008

Mitigating Cr Contamination by Hot Air Filtering in Solid Oxide Fuel Cells

Christian Ludwig, Jan Van Herle, Aïcha Hessler-Wyser, Josef Andreas Schuler

Cr contamination, generated by system components located upstream a solid oxide fuel cell (SOFC) and responsible for Cr-poisoning induced air electrode performance degradation, must be suppressed by hindering the access of Cr pollutants to the cathode comp ...

Electrochemical Society2011

Interactions between aluminium and fired passivating contacts during fire-through metallization (vol 249, 112051, 2023)

Christophe Ballif, Franz-Josef Haug, Aïcha Hessler-Wyser, Antoine Descoeudres, Andrea Ingenito, Mario Joe Lehmann, Sofia Libraro

Elsevier2024

Self-Patterned Nanoparticle Layers for Vertical Interconnects: Application in Tandem Solar Cells

Christophe Ballif, Franz-Josef Haug, Aïcha Hessler-Wyser, Mathieu Gérard Boccard, Björn Niesen, Michael Elias Stückelberger, Fanny Sculati-Meillaud

We demonstrate self-patterned insulating nanoparticle layers to define local electrical interconnects in thin-film electronic devices. We show this with thin-film silicon tandem solar cells, where we introduce between the two component cells a solution-pro ...

American Chemical Society2014

Measurements of local chemistry and structure in Ni(O)-YSZ composites during reduction using energy-filtered environmental TEM

Jan Van Herle, Cécile Hébert, Aïcha Hessler-Wyser, Quentin Thomas Jeangros

Energy-filtered transmission electron microscopy images are acquired during the reduction of a NiO-YSZ composite in H-2 up to 600 degrees C. Temperature-resolved quantitative information about both chemistry and structure is extracted with nm spatial resol ...

Royal Society of Chemistry2014