A5006939629- Nonlinear Optical Materials Research
- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Liquid Crystal Research Advancements
- Antenna Design and Analysis
- Organic Light-Emitting Diodes Research
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Chemical synthesis and pharmacological studies
- Microwave Engineering and Waveguides
- Semiconductor materials and devices
- Gas Sensing Nanomaterials and Sensors
- Surfactants and Colloidal Systems
- Millimeter-Wave Propagation and Modeling
- CCD and CMOS Imaging Sensors
- Advanced Memory and Neural Computing
- Photochemistry and Electron Transfer Studies
- Crystallization and Solubility Studies
- Material Dynamics and Properties
- Photorefractive and Nonlinear Optics
- Crystal Structures and Properties
- Molecular spectroscopy and chirality
- Polymer Nanocomposites and Properties
- Electron Spin Resonance Studies
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2024
CEA LITEN
2009-2024
CEA Grenoble
2009-2024
Université Grenoble Alpes
2016-2023
Laboratoire des Technologies de la Microélectronique
2009
University of Lausanne
1997
École Polytechnique Fédérale de Lausanne
1995-1997
Philips (Netherlands)
1996
ETH Zurich
1995-1996
Institut Charles Sadron
1990-1992
Phase separation in a polymerizing diacrylate/LC mixture is shown to be driven by liquid−gel demixing rather than liquid−liquid demixing. The structure of the gel strongly influences initial morphology: “early” phase (at low conversion) produces spherical domains, whereas “late” high nonspherical domains. higher conversion at separation, smaller A new method, simultaneous photo DSC/turbidity measurement, provides appearance nematic phase, and optical microscopy shows development morphology....
A thermodynamic model is given for phase separation induced by the increase of network elasticity during free-radical cross-linking polymerization. The importance in field polymer dispersed liquid crystals stressed. concept a conversion−phase diagram introduced as an attractive way to visualize onset all situations where results are presented diagrams.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrazone Derivatives, an Efficient Class of Crystalline Materials for Nonlinear OpticsChristophe Serbutoviez, Christian Bosshard, Georg Knoepfle, Peter Wyss, Philippe Pretre, Guenter, Kurt Schenk, Euro Solari, and Gervais ChapuisCite this: Chem. Mater. 1995, 7, 6, 1198–1206Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June...
Organic thin-film transistor (OTFT) performance depends on the chemical characteristics of interface between functional semiconductor/dielectric/conductor materials. Here we report for first time that OTFT response in top-gate architectures strongly substrate functionalization. Depending nature surface, dramatic variations and opposite trends TFT threshold voltage (~±50 V) OFF current (10(5)×!) are observed both p- n-channel semiconductors. However, field-effect mobility varies only...
Drastic efforts have been realized these last years in order to develop comple mentary organic technology. This is the essential key produce elementary low cost circuits for digital and analog applications. Different techniques are available nowadays obtain both Nand/or P-type devices. Screen printing one of most highly awaited low-cost that can be used devices circuits. It has widely organ ic technologies. Now N-type semiconductors become much more easily processed, developers seeking a...
In this paper we present the development of enhanced printed temperature sensors on large area flexible substrates . The process flow is a fully screen technology that uses exclusively solution-processed materials. These Screen are based resistive pastes integrated in Wheatstone bridge circuit Substrate commercial Poly Ethylene Naphtalate (PEN) with thickness 125 µm. Functional demonstrated and characterized good electrical properties, showing sensitivity 0.06 V/°C at V =4.8 V. This by...
n -channel organic thin film transistors were fabricated on polyethylene naphthalate substrates. The first part of the paper is devoted to a critical analysis eight methods extract threshold voltage from transfer characteristic in linear regime. Next, improve electron injection and reduce contact resistance, self-assembled monolayers (SAMs) deposited gold source drain electrodes. subsequent modification current-voltage characteristics analyzed by line method, using...
An analytical and physically based expression of organic solar cell I-V characteristic under dark illuminated conditions has been derived. This model found in very good agreement with both experimental data drift-diffusion numerical simulations accounting for the coupling Poisson equation optical propagation.
Polymerization induced phase separation in mixtures of liquid crystals (LCs) and acrylates (Merck TL205/PN393) proceeds by liquid-gel demixing, most cases practical interest. At high LC content or low temperature polymerization liquid-liquid cannot be excluded. Depending on the elasticity homogeneity polymer network at onset separation, spherical non-spherical domains are observed; reflect an inhomogeneous gel structure. The change from to occurs a very narrow range concentrations curing...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline Zwitterionic Stilbazolium Derivatives with Large Quadratic Optical NonlinearitiesChristophe Serbutoviez, Jean-Francois Nicoud, Jean Fischer, Isabelle Ledoux, and Joseph ZyssCite this: Chem. Mater. 1994, 6, 8, 1358–1368Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org/doi/10.1021/cm00044a039https://doi.org/10.1021/cm00044a039research-articleACS...
An organic nonlinear optical crystal, 5-nitro-2-thiophenecarboxaldehyde-4-methylphenylhydrazone (NTMPH), has been prepared and investigated with regard to polymorphism, growth, characterization of the structural physical properties. Recrystallization NTMPH in various solvents under different conditions showed existence three crystalline phases, red greenish plates (NTMPH−I) space group P21/n, orange prisms (NTMPH−II) Pna21, black needle (NTMPH−III) P21/n. The crystal structures that...
We present new experimental results on second-harmonic generation in highly conjugated organic molecules and molecular crystals recently developed our group, as well electro-optic eftects thin-film polymers. A large value of the hyperpolarizability a hydrazone-type molecule crystallizing noncentrosymmetric point group is reported. Large nonlinear optical coefticients up to 840 ± 200 pmN were measured 4'-dimethylamino-<i>N</i>-methyl-4-stilbazolium tosylate (DAST). The are compared with...
Single crystals of 4-dimethylaminobenzaldehyde-4-nitrophenylhydrazone were grown from solution. We determined their linear-optical (absorption and refractive indices) as well nonlinear-optical properties. From the highest coefficient d12=270 pm/V at λ=1.542µm we determine an effective deff⩾150 for phase-matched frequency doubling that is, to best our knowledge, largest reported phase-matchable coefficient. The properties are discussed in terms crystal structure molecular...
We have investigated the influence of semiconductor thickness varying by almost two orders magnitude on transfer and output characteristics top gate staggered organic field-effect transistors. observe that mobility in saturation regime is constant range studied. In contrast, subthreshold slope threshold voltage are highly impacted thickness, particular they showed a common optimum value. On both sides this we loss performances, which tentatively attributed to different mechanisms.
This paper presents a p-type Organic Thin-film Transistor (OTFT) technology based on gravure printing, specifically developed for scale-up and transfer to Pilot Line (GEN1 320 × 380 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ), In order enable large-area high-throughput processing cost-effective electronic circuitry sensors backplane production, this exploits an organic polymer semiconductor with high mobility engineered be...
Abstract This article presents the design steps of a planar circularly polarized (CP) bowtie‐shaped antenna for 2.4–2.5 GHz industry, science, and medicine band. Using these steps, an model is developed. The extensively described, simulated, measured, analyzed. simulated using HFSS software produced by laser etching copper on low‐cost Taconic RF‐35 substrate. presented method this easy to fabricate tunable different frequencies. CP has size 55 × 0.25 mm 3 , measured axial ratio bandwidth...
Large area sensing surface have strong interest for many applicative sectors: transport, health, building, industrial, user interface. Printed electronics offers breakthrough technical solutions to fulfill these applications. Indeed printed sensors, addressed by oTFT matrix and circuits, heterogeneously connected classical Silicon microprocessor the signal processing, unreached when multipoint, large flexibility are required. Recent developments in organic "CMOS" OTFT backplanes sensors...