Mohamed Amara
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View article: Design Rules for Structural Colors in All-Dielectric Metasurfaces: From Individual Resonators to Collective Resonances and Color Multiplexing
Design Rules for Structural Colors in All-Dielectric Metasurfaces: From Individual Resonators to Collective Resonances and Color Multiplexing Open
In this work, we comprehensively review Mie resonator-based and nonlocal resonant metasurfaces working in the reflection configuration for color printing applications, with particular attention to high observation angle applications. While…
View article: Influence of the thermally induced deflection of a space micro-concentrator photovoltaic array on its optical performances using finite element method
Influence of the thermally induced deflection of a space micro-concentrator photovoltaic array on its optical performances using finite element method Open
International audience
View article: Radiative sky cooling of silicon solar modules: Evaluating the broadband effectiveness of photonic structures
Radiative sky cooling of silicon solar modules: Evaluating the broadband effectiveness of photonic structures Open
Photovoltaic solar cells are designed to efficiently absorb solar photons but convert only a limited proportion of them into electricity. Under real operating conditions, the remaining energy causes solar modules to heat up to 50–60 °C, wh…
View article: Photonic crystal backbone for light trapping inside an ultrathin, low absorbing layer
Photonic crystal backbone for light trapping inside an ultrathin, low absorbing layer Open
A few tens of nanometre thick ultrathin materials may suffer from a very low absorption at their band edges. In this work, we investigate a photonic crystal (PC) made of a lowcost, transparent patterned silicon nitride (SiN x ) layer, conf…
View article: Light Management in Perovskite Photovoltaic Solar Cells: A Perspective
Light Management in Perovskite Photovoltaic Solar Cells: A Perspective Open
Light management is essential for metal‐halide perovskite solar cells to achieve record performance. In this review, criteria on materials, processes, and photonic engineering are established to enhance primarily the short circuit current …
View article: Realization of Polaritonic Topological Charge at Room Temperature Using Polariton Bound States in the Continuum from Perovskite Metasurface
Realization of Polaritonic Topological Charge at Room Temperature Using Polariton Bound States in the Continuum from Perovskite Metasurface Open
Exciton‐polaritons are mixed light–matter excitations resulting from the strong coupling regime between an active excitonic material and photonic resonances. Harnessing these hybrid excitations provides a rich playground to explore fascina…
View article: A fully coupled opto-electro-thermal model to investigate silicon solar cells under real operating conditions
A fully coupled opto-electro-thermal model to investigate silicon solar cells under real operating conditions Open
In this work, a fully coupled opto-electro-thermal model for crystalline silicon solar cells is presented. Based on a detailed set of material properties, the developed model allows us to predict and analyse the solar cell behaviour under …
View article: Realization of room temperature polaritonic vortex in momentum space with hybrid Perovskite metasurface
Realization of room temperature polaritonic vortex in momentum space with hybrid Perovskite metasurface Open
Exciton-polaritons are mixed light-matter excitations that result from the strong coupling regime between an active excitonic material and photonic resonances. Harnessing these hybrid excitations provides a rich playground to explore fasci…
View article: Color management of semi-transparent nano-patterned surfaces
Color management of semi-transparent nano-patterned surfaces Open
International audience
View article: First Mechanical Study on Lightweight Microconcentrators Systems for Space Applications
First Mechanical Study on Lightweight Microconcentrators Systems for Space Applications Open
The French Commission for Atomic and Alternative Energies (CEA) has been investigating a lightweight honeycomb core composite structure for micro-concentrators for space applications. This new design requires a double stage honeycomb sandw…
View article: Dynamic temperature effects in perovskite solar cells and energy yield
Dynamic temperature effects in perovskite solar cells and energy yield Open
Understanding the influence of the temperature on the performance of perovskite solar cells (PSCs) is essential for device optimization and for improving the stability of devices in outdoor conditions.
View article: Radiative sky cooling of solar cells: fundamental modelling and cooling potential of single-junction devices
Radiative sky cooling of solar cells: fundamental modelling and cooling potential of single-junction devices Open
A fundamental modelling framework of solar cells is presented in order to quantify the potential benefit of enhanced radiative sky cooling for different single-junction technologies, according to their basic electrical and thermal properti…
View article: Solid wetting-layers in inorganic nano-reactors: the water in imogolite nanotube case
Solid wetting-layers in inorganic nano-reactors: the water in imogolite nanotube case Open
The discovery of an original structure of the water at the inner surface of inorganic aluminogermanate nanotubes and its specific dynamics are reported, based on density functional theory molecular dynamics and inelastic neutron scattering.
View article: Tunnel junction <i>I</i>(<i>V</i>) characteristics: Review and a new model for p-n homojunctions
Tunnel junction <i>I</i>(<i>V</i>) characteristics: Review and a new model for p-n homojunctions Open
Despite the widespread use of tunnel junctions in high-efficiency devices (e.g., multijunction solar cells, tunnel field effect transistors, and resonant tunneling diodes), simulating their behavior still remains a challenge. This paper pr…
View article: Structural resolution of inorganic nanotubes with complex stoichiometry
Structural resolution of inorganic nanotubes with complex stoichiometry Open
The system Na 2 O-CaO-SiO 2 : 90 years of research, but do we really know everything?
View article: CSD 1838954: Experimental Crystal Structure Determination
CSD 1838954: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Temperature and color management of silicon solar cells for building integrated photovoltaic
Temperature and color management of silicon solar cells for building integrated photovoltaic Open
Color management of integrated photovoltaics must meet two criteria of performance: provide maximum conversion efficiency and allow getting the chosen colors with an appropriate brightness, more particularly when using side by side solar c…
View article: Advanced simulation of a PV module’s color
Advanced simulation of a PV module’s color Open
We apply advanced ray tracing to predict the color of an encapsulated solar cell. Previous studies have predicted the color from the thickness and refractive index of the antireflection coating and encapsulants. Here, we demonstrate how ot…
View article: Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes
Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes Open
Significant developments have been proposed over the past decade in the synthesis of aluminosilicate and aluminogermanate imogolite-like nanotubes. But, while liquid phase synthesis is well-controlled, it is not the case for the nanotube a…
View article: Encapsulant for glass-glass PV modules for minimum optical losses: gas or EVA?
Encapsulant for glass-glass PV modules for minimum optical losses: gas or EVA? Open
International audience
View article: Thermal Behaviour of a Dwelling Heated by Different Heating Systems
Thermal Behaviour of a Dwelling Heated by Different Heating Systems Open
In a house, the choice of the heating mode is an important factor to ensure the thermal comfort of occupants in the winter period. This choice can also contribute to reduce heating needs resulting in a reduction of energy consumption and a…
View article: Effect of PCM in Improving the Thermal Comfort in Buildings
Effect of PCM in Improving the Thermal Comfort in Buildings Open
A thermal dynamic simulation was realized with the TRNSYS 17 software, using type 204, to compare the thermal behaviour of an office having conventional walls with another office having walls incorporating phase change materials (PCMs). Th…
View article: MOMAC: a SAXS/WAXS laboratory instrument dedicated to nanomaterials
MOMAC: a SAXS/WAXS laboratory instrument dedicated to nanomaterials Open
This article presents the technical characteristics of a newly built small- and wide-angle X-ray scattering (SAXS/WAXS) apparatus dedicated to structural characterization of a wide range of nanomaterials in the powder or dispersion form. T…
View article: Impact of Environmental Conditions on the Performance of a 300 kWp Solar PV Plant in Djibouti
Impact of Environmental Conditions on the Performance of a 300 kWp Solar PV Plant in Djibouti Open
The impact of environmental conditions (temperature, dust) on the performance of a 300 kWp PV power plant operating in Djibouti since 2012 is presented in this work. The final yield (Yf) ranges from 3.5 h/d and 5.3 h/d giving and annual fi…
View article: Effects of non-ideal losses on the optimal bandgap arrangement of multi-junction solar cells comprising up to 5 subcells
Effects of non-ideal losses on the optimal bandgap arrangement of multi-junction solar cells comprising up to 5 subcells Open
The present work aims at better understanding the effects of the different limiting mechanisms on the performance of multi-junction stacks comprising up to 5 subcells, and to assess the extent to which the iso-efficiency curves derived wit…