A5055905207- Mathematical Dynamics and Fractals
- Geometric and Algebraic Topology
- Advanced Differential Equations and Dynamical Systems
- Chalcogenide Semiconductor Thin Films
- Mathematics and Applications
- Quantum chaos and dynamical systems
- Quantum Dots Synthesis And Properties
- Semiconductor materials and interfaces
- Copper-based nanomaterials and applications
- Homotopy and Cohomology in Algebraic Topology
- Semiconductor materials and devices
- GaN-based semiconductor devices and materials
- Geometry and complex manifolds
- Advanced Topology and Set Theory
- Plasma Diagnostics and Applications
- Silicon Carbide Semiconductor Technologies
- Functional Equations Stability Results
- Computational Geometry and Mesh Generation
- Advanced Topics in Algebra
- ZnO doping and properties
- Control and Dynamics of Mobile Robots
- Algebraic Geometry and Number Theory
- Topological and Geometric Data Analysis
- Chaos control and synchronization
- Advancements in Battery Materials
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2024
Université Grenoble Alpes
2018-2024
CEA LITEN
2013-2024
Sorbonne Université
2016-2022
Université Paris Cité
2003-2022
Institut de Mathématiques de Jussieu-Paris Rive Gauche
2012-2022
Centre National de la Recherche Scientifique
1999-2022
CEA LETI
2020-2021
CEA Grenoble
2014-2021
Teem Photonics (France)
2021
Here we report on technology developments implemented into the Graphene Flagship European project for integration of graphene and graphene-related materials (GRMs) energy application devices. Many technologies investigated so far aim at producing composite associating or GRMs with either metal semiconducting nanocrystals other carbon nanostructures (e.g., CNT, graphite). These composites can be used favourably as hydrogen storage solar cell absorbers. They also provide better performing...
Molybdenum (Mo) is the most used back contact in Cu2ZnSn(S1-xSex)4 based solar cells. However, it has been suggested recently that Mo not stable at interface with Cu2ZnSn(S1-xSex)4. In addition, to best of our knowledge, no experimental study carried out so far test whether cells built on another could exhibit better photovoltaic properties. For this purpose, various metals (Au, W, Pd, Pt, and Ni) are deposited top Mo, demonstrated possible synthesize device-quality thin films Au, Pt...
Intense research has been carried out in the past few years to improve efficiencies and understand limitations kesterite-based solar cells. Despite notable efforts determine list different failure modes affecting photovoltaic properties of these devices, very works have tried quantify classify effects modes. In this study, an exhaustive literature review first conducted causes leading limited kesterite with additional focus on cadmium-free critical raw material-free devices. Second, original...
Replacing the CdS buffer layer with a ZnSnO one in Cu2ZnSnS4-based solar cells allows both to improve device performances and avoid using toxic Cd. Additionally, sputtered is major asset for fabricated by physical vapor deposition processes. In this study, layers are deposited sputtering of single metal oxide target. Structural optical properties on Si or glass first described. The possibility modifying metallic composition adjusting power demonstrated. Attempts optoelectronic Ar:O2 Ar:SF6...
During the fabrication of a MOS-HEMT, plasma-etching steps are critical because they can damage GaN materials and lead to electrical degradation effects. In this paper, we propose evaluate etching performances through comparing Cl2-based atomic layer (ALE) process with He or Ar as sputtering gas. The self-limiting synergy window ALE has been investigated. Based on these results, reasons for nonself-limiting behavior process. Both processes were compared steady-state by investigating...
Inspired by Le Calvez's theory of transverse foliations for dynamical systems on surfaces, we introduce a invariant, denoted N , Hamiltonians any surface other than the sphere.When is plane or closed and aspherical, prove that set autonomous this invariant coincides with spectral invariants constructed Viterbo Schwarz aspherical surfaces.Along way, obtain several results independent interest: show formal satisfying minimal axioms, must coincide Hamiltonians, thus establishing certain...
We consider a self-homeomorphism h of some surface S . A subset F the fixed point set is said to be unlinked if there an isotopy from identity that fixes every With Le Calvez’ transverse foliations theory in mind, we prove existence sets are maximal with respect inclusion. As byproduct, arcwise connectedness space homeomorphisms 2-sphere preserve orientation and pointwise fix given closed connected
Consider a homeomorphism h of the closed annulus , isotopic to identity, such that rotation set is reduced single irrational number α (we say an pseudo-rotation). For every positive integer n, we prove there exists simple arc γ joining one boundary components other, disjoint from its n first iterates under h. As corollary, obtain rigid angle can be approximated by homeomorphisms are conjugate The result stated above analogue theorem Kwapisz dealing with diffeomorphisms two-torus; give some...
Nous nous proposons d'étudier l'entropie polynomiale de la composante errante n'importe quel système dynamique topologique inversible. Pour illustrer cette étude, calculerons divers homéomorphismes Brouwer, qui sont les du plan sans point fixe et préservant l'orientation. En particulier, verrons que tels peut prendre quelle valeur supérieure ou égale à 2.
The all-inorganic metal halide perovskite CsPbBr3 is a well-known semiconductor which attracts attention from many researchers in the field of optoelectronics. Although form single crystals offers best charge transport properties, their high cost fabrication makes them less suitable for large-scale applications. Polycrystalline films, on other hand, can fill this market gap, and numerous solution- vapor-based techniques exist to produce them. However, no superior solution has been found yet,...
We construct different types of quasiperiodically forced circle homeomorphisms with transitive but non-minimal dynamics. Concerning the recent Poincaré-like classification by Jäger and Stark for this class maps, we demonstrate that behaviour can occur in each cases. This closes one last gaps topological classification. Actually, are able to get some rather complicated minimal sets. For example, show examples construct, unique set is a Cantor its intersection vertical fibre uncountable...
In this paper we use the theory of barcodes as a new tool for studying dynamics area-preserving homeomorphisms. We will show that barcode Hamiltonian diffeomorphism surface depends continuously on diffeomorphism, and furthermore define Our main dynamical application concerns notion {\it weak conjugacy}, an equivalence relation which arises naturally in connection to $C^0$ continuous conjugacy invariants large class homeomorphisms with finite number fixed points, counted multiplicity, is...
Abstract Kesterite‐based solar cells suffer from a large open‐circuit voltage deficit, which largely arises carrier recombination at the buffer interface. In this study, we compare two strategies to passivate absorber surface in order fabricate devices with power conversion efficiency higher than 10% and an deficit as low 306 mV. These consist of annealing air or performing chemical etching absorbers before deposition. They lead similarly significant reduction interface but well shortening...
Sodium addition is necessary to reach high efficiencies with Cu(In,Ga)Se2 (CIGS) solar cells on metallic substrates. This can be achieved using DC-sputtered multilayer Mo back contacts including a sodium-doped layer (Mo:Na). In this study, 450 nm-thick Mo:Na layers were sputter-deposited Ti foils working pressure ranging from 3.4 mTorr 30 mTorr, and capped 100 nm-thick, dense, pure layers. The deposition of the strongly affected their electrical resistance, optical reflectance, morphology,...