A5010016227- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Copper-based nanomaterials and applications
- Magnetism in coordination complexes
- Quantum Dots Synthesis And Properties
- Photochemistry and Electron Transfer Studies
- Advanced Nanomaterials in Catalysis
- Polyoxometalates: Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Crystallization and Solubility Studies
- Advanced biosensing and bioanalysis techniques
- X-ray Diffraction in Crystallography
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Molecular Junctions and Nanostructures
- ZnO doping and properties
- Electrocatalysts for Energy Conversion
- Organic Light-Emitting Diodes Research
- Nonlinear Optical Materials Research
- Electrochemical sensors and biosensors
- Radical Photochemical Reactions
- Organic Electronics and Photovoltaics
- Photosynthetic Processes and Mechanisms
Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation
2015-2024
Nantes Université
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Université Nantes Angers Le Mans
2013-2016
Université d'Angers
2015
Centre National pour la Recherche Scientifique et Technique (CNRST)
2014
Dublin City University
2007-2012
Uppsala University
2010
Sorbonne Université
2009
Laboratoire de Synthèse Organique
2008
Although justly considered as a cumbersome component in artificial photosystems, these simple molecules are “necessary evil” to drive photo-induced reactions aiming at producing high added value by reduction of low energy substrates. This review first presents the specifications sacrificial electron donors. Then various families donors used from early 1970s nowadays reviewed, such aliphatic and aromatic amines, benzyl-dihydronicotinamide (BNAH), dimethylphenylbenzimidazoline (BIH), ascorbic...
Because solar energy is the most abundant renewable resource, clear connection between human activity and global warming has strengthened interest in photovoltaic science. Dye-sensitized cells (DSSCs) provide a promising low-cost technology for harnessing this source. Until recently, much of research surrounding DSSCs had been focused on sensitization n-type semiconductors, such as titanium dioxide (Gratzel cells). In an dye-sensitized cell (n-DSSC), electron injected into conduction band...
In tandem: Employing a molecular dyad and cobalt-based electrolyte gives threefold-increase in open-circuit voltage (V(OC)) for p-type NiO device (V(OC) = 0.35 V), fourfold better energy conversion efficiency. Incorporating these improvements TiO(2)/NiO tandem dye-sensitized solar cell (TDSC), results TDSC with V(OC) 0.91 V (see figure; CB conductance band, VB valence band).
The dye-sensitized solar cell, based on the sensitization of a wide-band-gap p-type semiconductor (p-DSC), is an emerging and new generation cell technology. p-DSCs share some similarities but also present important differences with classical Grätzel cells. Herein, we aim at reviewing most recent developments that have been accomplished in p-DSCs. We analyze strategies materials recently reported to improve p-DSSC efficiency. For each component, p-SC, dye, redox couple, discuss requirements...
We report on the synthesis, electrochemical, photophysical, and photovoltaic properties of a series three organic dyads comprising perylene monoimide (PMI) dye connected to naphthalene diimide (NDI) or fullerene (C60) for application in dye-sensitized solar cells (DSCs) with nanocrystalline NiO electrodes. It was found that secondary electron acceptor (NDI C60) all extends charge separated state lifetime by about five orders magnitude compared respective parent PMI dye. Nanosecond pump–probe...
Summary of photocurrent <italic>vs.</italic> time and (inset) total theoretical H<sub>2</sub> generated for the 7 different NiO electrodes compared in this study.
Two novel polyarginine labelled ruthenium polypyridyl dyes are reported, one conjugated to five, (Ru–Ahx–R5), and eight arginine residues, (Ru–Ahx–R8); both complexes exhibit long-lived, intense, oxygen-sensitive luminescence; (Ru–R8) is passively, efficiently very rapidly transported across the cell membrane into cytoplasm without requirement for its permeablisation.
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.
Record photoconversion efficiency was achieved in DSC with stable heteroleptic bisdiimine complexes prepared by HETPHEN strategy.
The development of molecular materials for conversion solar energy into electricity and fuels is one the most active research areas, in which light absorber plays a key role. In this article, we present class photo-sensitizers constituted by heteroleptic bis-diimine copper(I) complexes, whose features rely on their tunable MLCT excited states earth abundant environmentally friendly nature copper. These properties make dyes compatible with sustainable development. Their synthesis through...
Ultrafast discharge of a single-electron capacitor: A variety intramolecular electron-transfer reactions are apparent for polyoxometalates functionalized with covalently attached perylene monoimide chromophores, but these restricted to events. (et=electron transfer, cr=charge recombination, csr=charge-shift reaction, PER=perylene, POM=polyoxometalate).A new strategy is introduced that permits covalent attachment an organic chromophore polyoxometalate (POM) cluster. Two examples reported...
Three photoactive, multicomponent supermolecules have been synthesized and characterized whereby a porphyrin unit is covalently linked to Dawson-type heteropolyphosphotungstate (POM). The connection has made via Huisgen reaction, which gives good yields in all cases, modified provide linkages that vary their degree of internal flexibility. Fluorescence from the quenched by appended POM, for efficiency increases with increasing flexibility linker. Except most rigid connection, fluorescence...
The first trichromophoric sensitizer, consisting of covalently linked boradiazaindacene (BODIPY), zinc porphyrin (ZnP), and squaraine (SQ) units, has been synthesized by Heck alkynylation to obtain a panchromatic dye, for dye sensitized solar cells (DSSCs). Efficient intramolecular energy transfers (ET) were observed between all chromophoric subunits enhance the overall conversion efficiency 25%. antenna effect is demonstrated photoaction spectrum which features chromophore's absorption bands.
We report here the synthesis and full chemical physical characterizations of first stable heteroleptic copper(I)-bis(diimine) complexes designed for implementation in dye sensitized solar cells (DSC). Thanks to HETPHEN concept, pure copper(I) were isolated. Anchorage sensitizers was provided by 2,2'-biquinoline-4,4'-dicarboxylic acid (dcbqH2), while sterically challenged ligands 2,9-dimesityl-1,10-phenanthroline (L0)...
Molecular systems that follow the functional principles of photosynthesis have attracted increasing attention as a method for direct production solar fuels. This could give major carbon-neutral energy contribution to our future society. An outstanding challenge in this research is couple light-induced charge separation (which generates single electron−hole pair) multielectron processes water oxidation and fuel generation. New design considerations are needed allow several cycles photon...
A series of perylene dyes with different optical and electronic properties have been used as photosensitizers in NiO-based p-type dye-sensitized solar cells. key target is to develop that absorb light the red near-infrared region spectrum order match photoanodes optically tandem devices; however, photocurrent produced was found decrease dramatically absorption maxima dye varied from 517 565 nm strongly electrolyte solvent (acetonitrile, propionitrile, or propylene carbonate). To determine...
Abstract We prepared a series of four new diketopyrrolopyrroles (DPPs)‐based sensitizers that exhibit high‐molar extinction coefficients, extended absorption into the long wavelengths, and well‐suited photoredox properties to act as in p‐type dye‐sensitized solar cells (p‐DSSCs). These DPP dyes, composed thienyl core, are substituted on one end either by thiophene carboxylic (Th) or 4,4′‐[(phenyl)aza]dibenzoic acid anchoring group and, other extremity, proton naphthalene diimide (NDI)...
In this study, four new diketopyrrolopyrrole (DPP) sensitizers, with a dicarboxylated triphenylamine anchoring group for attachment to NiO, were prepared and their electronic absorption, emission electrochemical properties recorded. The nature of the excited-states was also modeled Time-Dependent Density Functional Theory (TD-DFT) quantum chemistry calculations. photovoltaic performances these dyes characterized in NiO-based dye-sensitized solar cells (DSCs) classical iodide/triiodide...
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,...
Three sensitizers were synthesized and utilized as panchromatic dyes for nanocrystalline NiO films: an iodo-squaraine (SQ), a squaraine-perylene monoimide (SQ-PMI) dyad, monoimide-naphthalene diimide (SQ-PMI-NDI) triad. Photophysical photovoltaic studies showed that hole injection into the valence band from SQ excited state is ultrafast, but also subsequent recombination very rapid, preventing being efficient sensitizer purposes. The introduction of second light harvesting unit (PMI)...
Three new cyclometalated iridium complexes were prepared and investigated on nanocrystalline NiO cathodes. Nanosecond transient absorption spectroscopy experiments show they present a surprisingly slow geminate charge recombination upon excitation NiO, representing thus the first examples of simple sensitizers with such feature. These used in dye-sensitized solar cells using film as semiconductor. The long-lived separated state these Ir make them compatible other redox mediators than...