A5087201687- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Photochromic and Fluorescence Chemistry
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced biosensing and bioanalysis techniques
- Synthesis and properties of polymers
- Molecular Junctions and Nanostructures
- Analytical Chemistry and Sensors
- Porphyrin and Phthalocyanine Chemistry
- Polydiacetylene-based materials and applications
- Nonlinear Optical Materials Research
- Synthesis and Properties of Aromatic Compounds
- Semiconductor materials and interfaces
- DNA and Nucleic Acid Chemistry
- Molecular Sensors and Ion Detection
- Electrochemical Analysis and Applications
- Organic Chemistry Cycloaddition Reactions
- Thin-Film Transistor Technologies
- Biosensors and Analytical Detection
- Organoboron and organosilicon chemistry
Université Laval
2014-2023
Canadian Institute for Advanced Research
2020
Département de Chimie Moléculaire
2014-2020
AgroParisTech
2014-2018
Microbiologie de l’alimentation au service de la santé
2014-2018
École Polytechnique Fédérale de Lausanne
2018
Direction de la Recherche Technologique
2017
McGill University
2017
Centre Hospitalier Universitaire de Caen Normandie
2016
Université de Caen Normandie
2016
On the basis of theoretical models and calculations, several alternating polymeric structures have been investigated to develop optimized poly(2,7-carbazole) derivatives for solar cell applications. Selected low band gap copolymers obtained via a Suzuki coupling reaction. A good correlation between DFT calculations performed on model compounds experimental HOMO, LUMO, energies corresponding polymers has obtained. This study reveals that copolymer HOMO energy level is mainly fixed by...
Polymeric materials are promising for solar cell applications. High-molecular-weight and soluble poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di- 2-thienyl-2',1',3'-benzothiadiazole)] is synthesized by either a Stille or Suzuki coupling reaction. Electrochemical optical characterization of this thermally air-stable polymeric material reported, bulk heretojunction polymer/fullerene photovoltaic devices fabricated.
A new alternating copolymer of dithienosilole and thienopyrrole-4,6-dione (PDTSTPD) possesses both a low optical bandgap (1.73 eV) deep highest occupied molecular orbital energy level (5.57 eV). The introduction branched alkyl chains to the unit was found be critical for improvement polymer solubility. When blended with PC71BM, PDTSTPD exhibited power conversion efficiency 7.3% on photovoltaic devices an active area 1 cm2.
Over the last five years, organic photovoltaic devices have emerged as a new competitor to silicon-based solar cells. In particular, bulk heterojunction architecture (BHJ), in which photoactive layer consists of bicontinuous blend an electron donor and acceptor, has allowed power conversion efficiencies around 8%. We will present this review latest conjugated polymers used such BHJ mainly focus on electron-donating (p-type) based thiophenes, 1,3,2-benzodiathiazoles,...
A new low-band-gap thieno[3,4-c]pyrrole-4,6-dione-based copolymer, PBDTTPD, has been designed and synthesized. PBDTTPD is soluble in chloroform or o-dichlorobenzene upon heating shows a broad absorption the visible region. The HOMO LUMO energy levels were estimated to be at −5.56 −3.75 eV, respectively. These electrochemical measurements fit well with an optical bandgap of 1.8 eV. When blended PC71BM, this polymer demonstrated power conversion efficiency 5.5% bulk-heterojunction photovoltaic...
Abstract Polyfluorenes are an important class of electroactive and photoactive materials. In the last three years this research field has literally exploded because polyfluorenes' exceptional electrooptical properties for applications in light‐emitting diodes. This is only family conjugated polymers that emit colors spanning entire visible range with high efficiency low operating voltage. Other unusual optical electrical made possible polyfluorene derivatives, such as thermochromism...
Abstract Summary: Carbazole‐based oligomeric and polymeric materials have been studied for almost 25 years their unique electrical, electrochemical optical properties. Interestingly, carbazole units can be linked in two different ways leading to either poly( 3,6 ‐carbazole) or 2,7 derivatives. While the former class seems very interesting phosphorescence applications, latter shows promising properties visible range light emitting diodes (LED). The major intrinsic difference between these...
Well-defined poly(2,7-fluorene) derivatives have been prepared through palladium-catalyzed couplings between various 9,9-disubstituted or 9-monosubstituted 2,7-dibromofluorenes and 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-dioctylfluorene. Using this versatile synthetic method, processable polyfluorenes obtained in good yields. In solution, all these neutral yellow polymers exhibit blue emission (maximum of around 410 nm) with high quantum yields (up to 0.87). Moreover, novel...
Different electrostatic interactions and conformational structures between single- or double-stranded negatively charged nucleic acids bound to a surface (see picture) water-soluble cationic poly(3-alkoxy-4-methylthiophene) derivatives (in yellow) provide the basis for sensitive optical detection method (colorimetric fluorometric) oligonucleotide hybridization. Supporting information this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2002/z18191_s.pdf from...
Single-stranded DNA (aptamer) can specifically bind potassium ions or human α-thrombin. When binding takes place, the aptamer undergoes a conformational transition from an unfolded to folded structure. This change of negatively charged oligonucleotide be detected by adding water-soluble, cationic polythiophene derivative, which transduces new complex formation into optical (colorimetric fluorometric) signal without any labeling probe target. simple and rapid methodology has enabled detection...
Conjugated polymers combine the interesting optical and electrical properties of metals with processing advantages mechanical traditional synthetic polymers. With clever use a variety tools, researchers have prepared highly pure optimized physical during past 30 years. For example, synthesis well-defined polyacetylenes, polyphenylenes, polythiophenes, polyfluorenes, other conjugated significantly improved performance these polymeric materials. However, one important class was missing from...
Organic bulk-heterojunction solar cells comprising poly[N-9'-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2', 1',3'-benzothiadiazole) (PCDTBT) are systematically aged and demonstrate lifetimes approaching seven years, which is the longest reported lifetime for polymer cells. An experimental set-up described that capable of testing large numbers cells, holding each device at its maximum power point while controlling monitoring temperature light intensity. Detailed facts importance...
Narrow bandgap n-type organic semiconductors (n-OS) have attracted great attention in recent years as acceptors solar cells (OSCs), due to their easily tuned absorption and electronic energy levels comparison with fullerene acceptors. Herein, a new n-OS acceptor, Y5, an electron-deficient-core-based fused structure is designed synthesized, which exhibits strong the 600-900 nm region extinction coefficient of 1.24 × 105 cm-1 , electron mobility 2.11 10-4 cm2 V-1 s-1 . By blending Y5 three...
Abstract This review highlights the recent progress made in area of thermoelectric (TE) applications conducting polymers and related composites. Several examples such materials their TE properties are discussed. new poly(2,7‐carbazole) derivatives highlighted. References also to carbon nanotube/polymer composites improved electrical performance. Studies on polymer/inorganic have taken a step forward shown very promising properties. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Phys,
Small-bandgap polymer solar cells (PSCs) with a thick bulk heterojunction film of 340 nm exhibit high power conversion efficiencies 9.40% resulting from short-circuit current density (JSC) 20.07 mA cm−2 and fill factor 0.70. This remarkable efficiency is attributed to maximized light absorption by the active layer minimized recombination optimized lateral vertical morphology through processing additive. As service our authors readers, this journal provides supporting information supplied...
The present review gives an overview of four the most promising classes conjugated polymers for plastic solar cells. latest developments on poly(2,7-carbazole)s, poly(1,4-diketopyrrolopyrrole)s, poly(thieno[3,4-b]thiophene)s, and poly(thieno[3,4-c]pyrrole-4,6-dione)s are reported. More precisely, synthesis physical electronic properties discussed. Devices characteristics such as open-circuit voltage, fill factor, short-circuit current density power conversion efficiency also addressed. In...
Rational creation of polymeric semiconductors from novel building blocks is critical to polymer solar cell (PSC) development. We report a new series bithiopheneimide-based donor-acceptor copolymers for bulk-heterojunction (BHJ) PSCs. The bithiopheneimide electron-deficiency compresses bandgaps and lowers the HOMOs--essential maximize power conversion efficiency (PCE). While dithiophene bridge progression R(2)Si→R(2)Ge minimally impacts bandgaps, it substantially alters HOMO energies....
Conjugated polymers have attracted much attention in recent years, as they can combine the best features of metals or inorganic semiconducting materials (excellent electrical and optical properties) with those synthetic (mechanical flexibility, simple processing, low-cost production), thereby creating altogether new scientific synergies technological opportunities. In search for more efficient methods preparation conjugated polymers, this Perspective reports advances field direct...
Don't stand Stille: A direct heteroarylation polycondensation reaction was used for the synthesis of high-molecular-weight thienopyrroledione-based polymers (see scheme) in an impressive yield (up to 96 %) and only a few synthetic steps. This new method is alternative standard Stille coupling thus avoids formation toxic tin by-products.