A5055065141- Inorganic Chemistry and Materials
- Copper-based nanomaterials and applications
- Advanced Photocatalysis Techniques
- Quantum Dots Synthesis And Properties
- TiO2 Photocatalysis and Solar Cells
- ZnO doping and properties
- Nanocluster Synthesis and Applications
- Polyoxometalates: Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- MXene and MAX Phase Materials
- Iron-based superconductors research
- Organometallic Complex Synthesis and Catalysis
- Advanced Thermoelectric Materials and Devices
- Catalytic Processes in Materials Science
- Crystallization and Solubility Studies
- Advanced Battery Materials and Technologies
- Electronic and Structural Properties of Oxides
- X-ray Diffraction in Crystallography
- Transition Metal Oxide Nanomaterials
- Optical Coatings and Gratings
- 2D Materials and Applications
- Laser-Ablation Synthesis of Nanoparticles
- Photonic Crystals and Applications
- Electrocatalysts for Energy Conversion
- Layered Double Hydroxides Synthesis and Applications
Université de Rennes
2016-2025
Centre National de la Recherche Scientifique
2015-2025
Institut des Sciences Chimiques de Rennes
2016-2025
École Nationale Supérieure de Chimie de Rennes
2024
Université Rennes 2
2021
Institut des Matériaux Jean Rouxel
2011-2017
Nantes Université
2011-2017
Arizona State University
2015-2016
Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation
2011-2013
Recently, metal sulfides have begun to receive attention as potential cost-effective materials for thermoelectric applications beyond optoelectronic and photovoltaic devices. Herein, based on a comparative analysis of the structural transport properties 2D PbSnS2 1D PbSnS3, we demonstrate that intrinsic effects govern low lattice thermal conductivity (κL) these originate from combination dimensionality their crystal structures with stereochemical activity lone-pair electrons cations. The...
Zinc oxide is considered as a very promising material for optoelectronics. However, to date, the difficulty in producing stable p-type ZnO bottleneck, which hinders advent of ZnO-based devices. In that context, nitrogen-doped zinc receives much attention. numerous reviews report controversial character conductivity N-doped ZnO, and recent theoretical contributions explain N-doping alone cannot lead p-typeness Zn-rich ZnO. We here ammonolysis at low temperature ZnO(2) yields pure...
CuGaO2 is used here as photocathode in place of NiO for a p-type dye-sensitized solar cell with iodide/triiodide (I−/I3−) or tris(4,4′-bis-tert-butyl-2,2′-bipyridine)cobalt (Co2+/Co3+) redox mediator, and PMI PMI-NDI sensitizer. Both photovoltaic characteristics flat band potentials suggest that can be viewed promising substitute NiO.
We report herein on the origin of black color NiO, widespread p-type semiconductor used as photocathode in dye-sensitized solar cells (DSSCs). Clearly, presence nickel metal (Ni0) was revealed by X-ray diffraction analyses and photoelectron spectroscopy all NiO samples we have prepared according to chemical routes usually employed for DSSC applications. Thus, cathodes is correlated existence Ni0 not increased amount Ni2+/Ni3+ mixed valence commonly suggested literature. Surprisingly,...
Copper-rich sulfides are very promising for energy conversion applications due to their environmental compatibility, cost effectiveness, and earth abundance. Based on a comparative analysis of the structural transport properties Cu3BiS3 with those tetrahedrite (Cu12Sb4S13) other Cu-rich sulfides, we highlight role cationic coordination types networks electrical thermal properties. By precession-assisted 3D electron diffraction analysis, find high anisotropic vibration copper attributed its...
Understanding the mechanism that connects heat transport with crystal structures and order/disorder phenomena is crucial to develop materials ultralow thermal conductivity (κ), for thermoelectric barrier applications, requires study of highly pure materials. We synthesized n-type sulfide CuPbBi5S9 an κ value 0.6-0.4 W m-1 K-1 in temperature range 300-700 K. In contrast prior studies, we show this synthetic does not exhibit ordered gladite mineral structure but instead forms a...
p-Type dye solar cells (p-DSSCs) have been receiving much attention due to their potential role in the elaboration of future tandem with a photoanode and photocathode built upon n-type p-type semiconductors, respectively. So far, NiO appears as most widely used semiconductor p-DSSCs. Yet this material suffers from several drawbacks, e.g., low electrical conductivity redox that limit photovoltaic performances. In framework, delafossite compounds may be regarded appropriate substitutes nickel...
First fabrication of a Ta<sub>6</sub>-based nanocomposite coating, for energy saving applications, by an EPD solution process.
To prevent the interfacial charge recombination between injected holes in valence band and redox mediator electrolyte p‐type dye sensitized solar cells (p‐DSSC) passivation of sites by organic insulator chenodeoxycholic acid (CDCA) layer is critically investigated this study. Rather than classical coating semiconductor's surface simultaneous co‐adsorption CDCA during dyeing step, two other methods are investigated. The first consists dissolving electrolyte, while second spin an ethanol...
Abstract The first step of the integration molybdenum clusters as new absorbers in all inorganic solar cells inspired from perovskite have been investigated via fabrication cluster sensitized cells. latter realized photoelectrodes obtained by chemisorption on TiO 2 and NiO films (respectively named photoanodes photocathodes). Photovoltaic characteristics reveal that photoinduced electron or hole transfers can occur units to n‐ p‐type semiconductors respectively. These photovoltaic...
Ambipolar materials such as carbon nanotubes, graphene, or 2D transition metal chalcogenides are very attractive for a large range of applications, namely, light-emitting transistors, logic circuits, gas sensors, flash memories, and solar cells. In this work, it is shown that the nanoarchitectonics inorganic Mo6 cluster-based iodides enable to form thin films exhibiting photophysical properties their classification new members restricted family ambipolar materials. Thus, electronic ternary...
This study deals with the nanoarchitectonic concept applied to design of photoelectrodes built on two types cluster core building blocks, namely, {Re 6 S i 8 } and Se }. The effect nature metal/ligand photoinduced conductivity properties is thus investigated through an in‐depth photoelectrochemical it rationalized by establishment energy diagram using a set complementary optical (ultraviolet–vis–near infrared), electrochemical spectroscopic (X‐ray photoelectron spectroscopy) characterization...
The mixing of rhenium and molybdenum within the same heterometallic cluster enables to modulate optoelectronic properties photo-active layers. Such {Re 4 Mo 2 Q 8 }-based photoelectrodes appear promising for photoelectrochemical water splitting.
Mixed-anion compounds, which incorporate multiple types of anions into materials, display tailored crystal structures and physical/chemical properties, garnering immense interest in various applications such as batteries, catalysis, photovoltaics, thermoelectrics. However, detailed studies regarding correlations among structure, chemical bonding, thermal/vibrational properties are rare for these limits the exploration mixed-anion compounds associated thermal applications. In this work, we...
Abstract This review paper summarizes our very recent works on the synthesis of multifunctional transparent nanocomposite thin films or coatings based metal atom clusters by an electrophoretic deposition (EPD) process. Eight different octahedral with niobium, molybdenum tantalum as metallic cores were used to prepare highly in visible. Green, yellow, orange, red and brown colored successfully fabricated coating a conductive oxide glass substrate. Transparent prominent luminescent properties...
The use of photonic crystals (PCs) is gaining interest regarding the interaction between light and organized structures. However, there are limitations to their use, such as production cost, rate, substrate size. This study demonstrates an efficient cost-effective fabrication opal structure based on electrophoretic deposition (EPD) self-made silica particles. process allows one reduce time compared classical evaporation or sedimentation methods, which can take days (evaporation) weeks months...
Abstract Owing to its high technological importance for optoelectronics, zinc oxide received much attention. In particular, the role of defects on physical properties has been extensively studied as well their thermodynamical stability. a large concentration Zn vacancies in ZnO bulk materials is so far considered highly unstable. Here we report that thermal decomposition peroxide produces wurtzite-type nanoparticles with an extraordinary amount (>15%). These segregate at surface...
The integration by a solution deposition process of tantalum octahedral clusters in multifunctional nanocomposite materials and devices for smart windows is investigated the first time this study.
Nanoporous structures of a p-type semiconductor, delafossite CuAlO2, with high crystallinity have been fabricated through an inorganic/polymer double-gel process and characterized for the first time via Mott–Schottky measurements. The effect precursor concentration, calcination temperature, atmosphere were examined to achieve photoelectrochemical properties while maximizing porosity. optical nanoporous CuAlO2 are in good agreement literature band gap 3.9 eV, observed electrical conductivity...
The high-performance defect-rich MoS2 dominated by sulfur vacancies as well Mo-rich environments have been extensively studied in many fields, such nitrogen reduction reactions, hydrogen evolution sensing devices for NH3, which are attributed to the under-coordinated Mo atoms playing a significant role catalytic sites defect area. In this study, cluster-MoS2 composite was creatively synthesized through one-step sulfurization process via H2/H2S gas flow. Mo6 cluster iodides (MIs) coated on...
Layered LaOCuS oxysulfide has been successfully implemented as a photocathode in p-type dye sensitized solar cells, an alternative to NiO.