Publications by authors named "Antoine Bousquet"

13 Publications

  • Page 1 of 1

Review of Waterborne Organic Semiconductor Colloids for Photovoltaics.

ACS Nano 2021 Mar 23;15(3):3927-3959. Epub 2021 Feb 23.

Centre for Organic Electronics, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.

Development of carbon neutral and sustainable energy sources should be considered as a top priority solution for the growing worldwide energy demand. Photovoltaics are a strong candidate, more specifically, organic photovoltaics (OPV), enabling the design of flexible, lightweight, semitransparent, and low-cost solar cells. However, the active layer of OPV is, for now, mainly deposited from chlorinated solvents, harmful for the environment and for human health. Active layers processed from health and environmentally friendly solvents have over recent years formed a key focus topic of research, with the creation of aqueous dispersions of conjugated polymer nanoparticles arising. These nanoparticles are formed from organic semiconductors (molecules and macromolecules) initially designed for organic solvents. The topic of nanoparticle OPV has gradually garnered more attention, up to a point where in 2018 it was identified as a "trendsetting strategy" by leaders in the international OPV research community. Hence, this review has been prepared to provide a timely roadmap of the formation and application of aqueous nanoparticle dispersions of active layer components for OPV. We provide a thorough synopsis of recent developments in both nanoprecipitation and miniemulsion for preparing photovoltaic inks, facilitating readers in acquiring a deep understanding of the crucial synthesis parameters affecting particle size, colloidal concentration, ink stability, and more. This review also showcases the experimental levers for identifying and optimizing the internal donor-acceptor morphology of the nanoparticles, featuring cutting-edge X-ray spectromicroscopy measurements reported over the past decade. The different strategies to improve the incorporation of these inks into OPV devices and to increase their efficiency (to the current record of 7.5%) are reported, in addition to critical design choices of surfactant type and the advantages of single-component binary nanoparticle populations. The review naturally culminates by presenting the upscaling strategies in practice for this environmentally friendly and safer production of solar cells.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsnano.0c10161DOI Listing
March 2021

A nanopatterned dual reactive surface driven by block copolymer self-assembly.

Nanoscale 2020 Apr 27;12(14):7532-7537. Epub 2020 Mar 27.

Universite de Pau et Pays de l'Adour, E2S UPPA, CNRS, Institut des Sciences Analytiques & de Physico-Chimie pour l'Environnement & les Matériaux, UMR5254, 64000, Pau, France.

Herein, we report the selective functionalization of nano-domains obtained by the self-assembly of a polystyrene-block-poly(vinyl benzyl azide) PS-b-PVBN copolymer synthesized in three steps. First, a polystyrene macro-initiator was synthesized, and then extended with vinyl benzyl chloride by nitroxide mediated polymerization to form polystyrene-block-poly(vinyl benzyl chloride) PS-b-PVBC. Nucleophilic substitution of vinyl benzyl chloride into a vinyl benzyl azide moiety is finally performed to obtain PS-b-PVBN which self-assembled into nano-domains of vinyl benzyl azide PVBN. Click chemistry was then used to bind functional gold nanoparticles and poly(N-isopropylacrylamide) (PNIPAM) on PVBN domains due to the specific anchoring at the surface of the nanopatterned film. Atomic force microscopy (AFM) was used to observe the block copolymer self-assembly and the alignment of the gold nanoparticles at the surface of the PVBN nanodomains. Thorough X-ray photoelectron spectroscopy (XPS) analysis of the functional film showed evidence of the sequential grafting of nanoparticles and PNIPAM. The hybrid surface expresses thermo-responsive properties and serves as a pattern to perfectly align and control the assembly of inorganic particles at the nanoscale.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/c9nr10740aDOI Listing
April 2020

[email protected] Functional Nanoparticle-Driven Rod-Coil Diblock Copolymer Self-Assembly.

Langmuir 2019 Dec 10;35(51):16925-16934. Epub 2019 Dec 10.

CNRS/Université de Pau et des Pays de l'Adour/E2S UPPA , IPREM CNRS-UMR 5254 Hélioparc , 2 Avenue Président Angot , 64053 Pau Cedex 9, France.

Herein, a novel strategy to overcome the influence of π-π stacking on the rod-coil copolymer organization is reported. A diblock copolymer poly(3-hexylthiophene)--poly(ethylene glycol methyl ether methacrylate) (P3HT--PEGMA) was synthesized by the Huisgen cycloaddition, so-called "click chemistry", combining the PEGMA and P3HT blocks synthesized by atom transfer radical polymerization and Kumada catalyst transfer polymerization, respectively. Using a dip-coating process, we controlled the original film organization of the diblock copolymer by the crystallization of the P3HT block via π-π stacking. The morphology of the P3HT--PEGMA films was influenced by the incorporation of gold nanoparticles (GNPs) coated by poly(ethylene glycol) ligands. Indeed, the crystalline structuration of the P3HT sequence was counterbalanced by the addition in the film of gold nanoparticles finely localized within the copolymer PEGMA matrix. Transmission electron microscopy and time-of-flight secondary ion mass spectrometry analysis validated the GNP homogeneous localization into the compatible PEGMA phase. Differential scanning calorimetry showed the rod block crystallization disruption. A morphological transition of the self-assembly is observed by atomic force microscopy from P3HT fibrils into out-of-plane cylinders driven by the nanophase segregation.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.langmuir.9b02744DOI Listing
December 2019

Hierarchically organized honeycomb films through block copolymer directed self-assembly in "breath figure" templating and soft microwave-triggered annealing.

Soft Matter 2018 Jun;14(23):4874-4880

Univ Pau & Pays Adour, CNRS UMR 5254, IPREM, Equipe Physique & Chimie des Polymères, 2 avenue Angot, 64053, Pau, France.

Hierarchically organized polymer films are produced with a high level of order from the combination of block copolymer nanophase segregation, "breath figure" methodology and microwave irradiation. A block copolymer based on poly(methyl methacrylate) and poly(n-butylacrylate) featuring cylindrical nanopatterns is involved in the "breath figure" process to create a microporous honeycomb structure. These films are submitted to microwave annealing to enhance the degree of ordering of the nano-segregation without the destruction of the honeycomb microstructure, which is not possible by classical thermal or solvent annealing. Ellipsometry, optical and atomic force microscopy are used to study three key parameters; the substrate nature, the film thickness and the microwave irradiation power. The silicon wafer is the substrate of choice to efficiently act as the heating transfer element and 60 seconds at 10 watts are enough to nicely order the 1 μm thick copolymer films. These conditions are eventually applied on hierarchically organized polymer films to obtain a hexagonal array of 100 nm deep holes within a matrix of perpendicularly aligned nano-cylinders.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/c8sm00137eDOI Listing
June 2018

Crucial Role of the Electron Transport Layer and UV Light on the Open-Circuit Voltage Loss in Inverted Organic Solar Cells.

ACS Appl Mater Interfaces 2017 Oct 25;9(39):34131-34138. Epub 2017 Sep 25.

Université Bordeaux, IMS, CNRS, UMR 5218, Bordeaux INP, ENSCBP , F-33405 Talence, France.

Understanding the degradation mechanisms in organic photovoltaics is crucial in order to develop stable organic semiconductors and robust device architectures. The rapid loss of efficiency, referred to as burn-in, is a major issue to be addressed. This study reports on the influence of the electron transport layer (ETLs) and UV light on the drop of open-circuit voltage (V) for P3HT:PCBM-based devices. The results show that V loss is induced by the UV and, more importantly, that the ETL can amplify it, with TiO yielding a stronger drop than ZnO. Using impedance spectroscopy (IS) and X-ray photoelectron spectroscopy (XPS), different degradation mechanisms were identified according to whether the ETL is TiO or ZnO. For TiO-based devices, the formation of an interface dipole was identified, resulting in a loss of the flat-band potential (V) and, thus, of the V. For ZnO-based devices, chemical modifications of the metal oxide and active layer at the interface were detected, resulting in a doping of the active layer which impacts the V. This study highlights the role of the architecture and, more specifically, of the ETL in the severity of burn-in and degradation pathways.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsami.7b09059DOI Listing
October 2017

Hierarchical honeycomb-structured films by directed self-assembly in "breath figure" templating of ionizable "clicked" PH3T-b-PMMA diblock copolymers: an ionic group/counter-ion effect on porous polymer film morphology.

Chem Commun (Camb) 2017 Feb;53(11):1876-1879

IPREM CNRS-UMR 5254, Equipe de Physique et Chimie des Polymères, Université de Pau et des Pays de l'Adour, Hélioparc, 2 avenue Président Angot, 64053 Pau Cedex 9, France.

The self-assembly of 1,2,3-triazole and ionic 1,2,3-triazolium "clicked" poly(3-hexylthiophene)-b-poly(methylmethacrylate) (P3HT-b-PMMA) rod-coil diblock copolymers was used to fabricate honeycomb-patterned porous films via "breath figure" templating. The surface and inner morphologies of the honeycomb films can be both controlled by either ionizing the 1,2,3-triazole linker or changing the counter-ion nature.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/c6cc09898cDOI Listing
February 2017

Hierarchically porous bio-inspired films prepared by combining "breath figure" templating and selectively degradable block copolymer directed self-assembly.

Chem Commun (Camb) 2016 Jul;52(61):9562-5

Université de Pau & Pays Adour, IPREM (CNRS, UMR 5254)-Equipe de Physique & Chimie des Polymères (EPCP) - Hélioparc, 2 Avenue Président Angot, 64053, Pau, France.

Polymer films with hierarchical micro- and nano-porosities were prepared by combining the fast solvent evaporation "Breath Figure" (BF) method, exhibiting a highly regular honeycomb micro-porous texture, with the additional nanoscale self-assembly of polylactide-block-polystyrene (PLA-b-PS) diblock copolymers, PLA being used thereafter as a sacrificial component for nano-porosity.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/c6cc04760bDOI Listing
July 2016

Biomimetic Mussel Adhesive Inspired Anchor to Design [email protected](3-Hexylthiophene) Hybrid [email protected] Nanoparticles.

Macromol Rapid Commun 2015 Aug 1;36(16):1486-91. Epub 2015 Jun 1.

Université de Pau et des Pays de l'Adour, Equipe de Physique et Chimie des Polymere, Hélioparc 2 avenue Président Angot, 64053, Pau Cedex 9, France.

The functionalization of zinc oxide (ZnO) nanoparticles by poly(3-hexylthiophene) (P3HT) brush is completed by the combination of a mussel inspired biomimetic anchoring group and Huisgen cyclo-addition "click chemistry." Herein, the direct coupling of an azide modified catechol derivative with an alkyne end-functionalized P3HT is described. This macromolecular binding agent is used to access [email protected] [email protected] with a stable and homogeneous conjugated organic corona. Preliminary photoluminescence measurement proves an efficient electron transfer from the donor P3HT to the acceptor ZnO nanoparticles upon grafting, thus demonstrating the potential of such a combination in organic electronics.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/marc.201500184DOI Listing
August 2015

Elucidation of the mechanism of redox grafting of diazotated anthraquinone.

Langmuir 2012 Jun 11;28(25):9573-82. Epub 2012 Jun 11.

Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus, Denmark.

Redox grafting of aryldiazonium salts containing redox units may be used to form exceptionally thick covalently attached conducting films, even in the micrometers range, in a controlled manner on glassy carbon and gold substrates. With the objective to investigate the mechanism of this process in detail, 1-anthraquinone (AQ) redox units were immobilized on these substrates by electroreduction of 9,10-dioxo-9,10-dihydroanthracene-1-diazonium tetrafluoroborate. Electrochemical quartz crystal microbalance was employed to follow the grafting process during a cyclic voltammetric sweep by recording the frequency change. The redox grafting is shown to have two mass gain regions/phases: an irreversible one due to the addition of AQ units to the substrate/film and a reversible one due to the association of cations from the supporting electrolyte with the AQ radical anions formed during the sweeping process. Scanning electrochemical microscopy was used to study the relationship between the conductivity of the film and the charging level of the AQ redox units in the grafted film. For that purpose, approach curves were recorded at a platinum ultramicroelectrode for AQ-containing films on gold and glassy carbon surfaces using the ferro/ferricyanide redox system as redox probe. It is concluded that the film growth has its origin in electron transfer processes occurring through the layer mediated by the redox moieties embedded in the organic film.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/la301391sDOI Listing
June 2012

Redox grafting of diazotated anthraquinone as a means of forming thick conducting organic films.

Langmuir 2012 Jan 16;28(2):1267-75. Epub 2011 Dec 16.

Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark.

Thick conductive layers containing anthraquinone moieties are covalently immobilized on gold using redox grafting of the diazonium salt of anthraquinone (i.e., 9,10-dioxo-9,10-dihydroanthracene-1-diazonium tetrafluoroborate). This grafting procedure is based on using consecutive voltammetric sweeping and through this exploiting fast electron transfer reactions that are mediated by the anthraquinone redox moieties in the film. The fast film growth, which is followed by infrared reflection absorption spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy, ellipsometry, and coverage calculation, results in a mushroom-like structure. In addition to varying the number of sweeps, layer thickness control can easily be exerted through appropriate choice of the switching potential and sweep rate. It is shown that the grafting of the diazonium salt is essentially a diffusion-controlled process but also that desorption of physisorbed material during the sweeping process is essentially for avoiding blocking of the film due to clogging of the electrolyte channels in the film. In general, sweep rates higher than 0.5 V s(-1) are required if thick, porous, and conducting films should be formed.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/la203657nDOI Listing
January 2012

Thiol-alkyne chemistry for the preparation of micelles with glycopolymer corona: dendritic surfaces versus linear glycopolymer in their ability to bind to lectins.

Macromol Rapid Commun 2011 Oct 19;32(20):1620-6. Epub 2011 Aug 19.

Centre of Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, New South Wales 2052, Australia.

A poly(tert-butyl acrylate) (P(tBA)) with a glycodendric endfunctionality with eight glucose moieties was synthesised in four steps via a combination of esterification, thiol-alkyne conjugation and hetero-Diels-Alder (HDA) cycloaddition. A linear glycopolymer of similar size and composition was also synthesised in order to compare the protein binding characteristics of the polymer with glycodendritic endfunctionality to the linear glycol blockcopolymer. The two amphiphilic polymers were self-assembled in water into micelles. These particles were then tested for their ability to bind to Concanavalin A (Con A). In a turbidity assay, the polymer glycodendron exhibited a significantly faster clustering rate to the lectin as compared to the linear glycopolymer. In a precipitation assay, it is found that significantly less glucose residue is required for binding per Con A for the polymer with the glycodendritic endfunctionality.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/marc.201100331DOI Listing
October 2011

Environmentally responsive particles: from superhydrophobic particle films to water-dispersible microspheres.

Langmuir 2010 Dec 16;26(24):18617-20. Epub 2010 Nov 16.

Laboratoire de Chimie des Polymères Organiques, CNRS, Université Bordeaux I, ENSCPB. 16, Avenue Pey Berland, 33607 Pessac Cedex, France.

We describe the preparation, by precipitation copolymerization, of multifunctional divinylbenzene-co-pentafluorostyrene microspheres able to produce superhydrophobic surfaces or disperse in aqueous media upon annealing either in air or water, respectively. For that purpose, an amphiphilic block copolymer, polystyrene-b-poly(acrylic acid), was introduced in the initial feed composed of divinylbenzene and 2,3,4,5,6-pentafluorostyrene. As a result, fluorinated particles were obtained in which the diblock copolymer was encapsulated during the polymerization step. Upon annealing in dry air, the particles are completely hydrophobic and form superhydrophobic surfaces. On the contrary, annealing in water induces the reorientation of the PAA groups toward the particle interface, thus the particles can be dispersed in aqueous media. In addition, the presence of carboxylic acid groups at the particle interface permits us to switch the surface charge between negative and neutral depending on the environmental pH.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/la103963zDOI Listing
December 2010

Structured assemblies of ferromagnetic particles through covalent immobilization on functionalized polymer surfaces obtained by surface segregation.

Langmuir 2007 Jun 16;23(13):6879-82. Epub 2007 May 16.

Laboratoire de Chimie des Polymères Organiques (LCPO), Université Bordeaux 1, ENSCPB-CNRS, UMR 5629, 16 Avenue Pey Berland, 33607 Pessac-Cedex, France.

We report a strategy to immobilize magnetic particles on polymer surfaces in an organized manner. Surface segregation of binary polymer blends provided surfaces with the desired chemical functions (carboxylic functions). These functional groups were demonstrated to be accessible and were thus able to react with magnetic particles functionalized with amine functions. The presence of a magnetic field during the covalent attachment step in direct surface patterning produced particle chains oriented parallel to the field.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/la700255eDOI Listing
June 2007
-->