A5051088398- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Ion-surface interactions and analysis
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Thin-Film Transistor Technologies
- Surface Modification and Superhydrophobicity
- Perovskite Materials and Applications
- Advanced Electron Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- Polymer Nanocomposite Synthesis and Irradiation
- Geomagnetism and Paleomagnetism Studies
- Metal and Thin Film Mechanics
- Analytical chemistry methods development
- Geochemistry and Elemental Analysis
- Crystallography and Radiation Phenomena
- Calcium Carbonate Crystallization and Inhibition
- Plasma Diagnostics and Applications
- Molecular Junctions and Nanostructures
- Copper Interconnects and Reliability
- Characterization and Applications of Magnetic Nanoparticles
Synchrotron soleil
2016-2025
Institut de Sciences des Matériaux de Mulhouse
2018
Centre Hospitalier de Mulhouse
2018
National Institute of Technology
2018
North Carolina State University
2007-2012
Federal Institute For Materials Research and Testing
2004-2010
The bulk nanomorphology of organic heterojunction devices, particularly all-polymer is difficult to characterize due limited electron density contrast between constituent materials. Resonant soft X-ray scattering can overcome this problem and used show that the morphologies in chloroform cast subsequently annealed polyfluorene copolymer poly(9,9'-dioctylfluorene-co-bis(N,N'-(4,butylphenyl))bis(N,N'-phenyl-1,4-phenylene)diamine) (PFB) poly(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT)...
Near edge x-ray absorption fine structure (NEXAFS) spectroscopy has evolved into a powerful characterization tool for polymeric materials and is increasingly being used to elucidate composition orientation in thin films of relevance organic electronic devices. For accurate quantitative compositional analysis, insight the ability assess molecular orientation, reliable reference spectra with known energy resolution calibrated scale are required. We report set such NEXAFS from 23 semiconducting...
Abstract Through controlled annealing of planar heterojunction (bilayer) devices based on the polyfluorene copolymers poly(9,9‐dioctylfluorene‐co‐bis(N,N′‐(4,butylphenyl))bis(N,N′‐phenyl‐1,4‐phenylene)diamine) (PFB) and poly(9,9‐dioctylfluorene‐co‐benzothiadiazole) (F8BT) we study influence interface roughness generation separation electron–hole pairs at donor/acceptor interface. Interface structure is independently characterized by resonant soft X‐ray reflectivity with interfacial width...
The HERMES beamline (High Efficiency and Resolution dedicated to X-ray Microscopy Electron Spectroscopy), built at Synchrotron SOLEIL (Saint-Auban, France), is soft microscopy. combines two complementary microscopy methods: XPEEM (X-ray Photo Emitted Microscopy) STXM (Scanning Transmission with an aim reach spatial resolution below 20 nm fully exploit the local spectroscopic capabilities of microscopes. availability methods within same enables users select appropriate approach study their...
The availability of intense soft x-ray beams with tunable energy and polarization has pushed the development highly sensitive, element-specific, noninvasive microscopy techniques to investigate condensed matter high spatial temporal resolution. short wavelengths x-rays promise reach resolutions in deep single-digit nanometer regime, providing unprecedented access magnetic phenomena at fundamental length scales. Despite considerable efforts techniques, a two-dimensional resolution 10 nm not...
Abstract Ptychography is a coherent diffraction imaging technique that measures patterns at many overlapping points on sample and then uses an algorithm to reconstruct amplitude phase images of the object probe. Here, we report imaging, spectroscopy linear dichroism ptychographic measurements carbon K-edge. This progress was achieved with new generation scientific Complementary Metal Oxide Semiconductor (sCMOS) X-ray cameras uncoated image sensor which has fast transfer high quantum...
Abstract Low‐cost and high‐performance electronics based on synthetically simple materials are required to fuel the deployment of smart packaging wearable electronics. Metal phthalocyanines (MPcs) promising semiconductors for use in n‐type organic thin film transistors (OTFTs) but often require high operating voltages. The first silicon phthalocyanine‐based OTFT with a polymer dielectric is reported as an alternative traditional metal oxide dielectrics. Incorporating poly(methyl...
Abstract Summary: Plasma deposited allylamine films were studied by “in situ” ToF‐SSIMS, XPS and NEXAFS Spectroscopy before exposure to ambient air. The influence of external plasma parameters such as duty cycle, power, monomer flow rate on (i) unsaturation, (ii) branching cross‐linking, (iii) nitrogen surface concentration (iv) retention amino groups was investigated. Harder conditions, which can be obtained when high cycles, low rates are employed, increase the unsaturated, branched...
Silicon phthalocyanines (SiPcs) have shown great potential as n-type or ambipolar organic semiconductors in thin-film transistors (OTFTs) and photovoltaics. Although properly designed SiPcs rival current state-of-the-art semiconducting materials, relatively few structure–property relationships been established to determine the impact of axial substituents on OTFT performance, hindering intelligent design next generation SiPcs. To address this omission, we developed for vapor-deposited with...
The impressive progress in the performance of synchrotron radiation sources is nowadays driven by so-called `ultimate storage ring' projects which promise an unprecedented improvement brightness. Progress on detector side has not always been at same pace, especially as far soft X-ray 2D detectors are concerned. While most commonly used still based microchannel plates or CCD technology, recent developments CMOS (complementary metal oxide semiconductor)-type will play ever more important role...
We study the influence of electrical biasing on modification chemical composition and performance perovskite solar cells (PSCs) by coupling electrochemical impedance spectroscopy (EIS) scanning transmission X-ray microscopy (STXM) techniques. EIS reveals formation charge accumulation at interfaces changes in resistive capacitive properties. STXM PSCs after applying a strong electric field for long time indicates breakdown methylammonium (MA+) cation, promoting iodide ions to migrate create...
Understanding the interactions between metal-based nanoparticles and biological systems in complex environments (e.g., human body, soils, marine settings) remains challenging, especially at single-cell nanoscale levels. Capturing...
F substituents & bulky alkyl side-chains for polymer:fullerene face-on orientation and high PV performances.
Magnetotactic bacteria are a highly studied group of diverse prokaryotes that biomineralize chains magnetosomes, single domain, crystal magnetic nanoparticles magnetite or greigite, enclosed by lipid bilayer membrane whose synthesis is under strict genetic control. In addition to characterizing the genetics and physicochemical properties both cultured uncultured environmental species, there have been number investigations using time course approach determine chemical pathway...
Silicon phthalocyanine (SiPc) derivatives have recently emerged as promising materials for n-type organic thin-film transistors (OTFTs) with the ability to be fabricated either by solid state or solution processes through axial functionalization.
Understanding the morphological and chemical structural changes of electrocatalysts under reaction conditions remains a key challenge. Here, we present detailed study how individual cubic copper particles change morphology oxidation state as function applied potential during electrochemical carbon dioxide reduction using in situ soft X-ray spectro-ptychography. In comparison with scanning transmission microscopy, spatial resolution is improved by factor 3 through measuring patterns...
Abstract N‐type organic semiconductors are particularly susceptible to degradation by ambient air. One such solution this issue is include additives in the inks these would be cast from that enhance device stability after film deposition. This method reduce number of processing steps needed fabricate devices compared other stabilization methods, as encapsulation. In study, n ‐type performance semiconductor...
We investigate the influence of annealing on morphology intimately mixed blends conjugated polymers poly(9,9'-dioctylfluorene-co-bis-N,N'-(4-butylphenyl)-bis-N,N'-phenyl-1,4-phenylene-diamine) (PFB) and poly(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT) with scanning transmission x-ray microscopy (STXM). Through use a zone plate theoretical Rayleigh resolution 30 nm, we are able to resolve sub-100 nm bulk structure in these films. Surprisingly, for unannealed films spin-coated from...
Journal Article 7 nm Spatial Resolution in Soft X-ray Microscopy Get access Benedikt Rösner, Rösner Paul Scherrer Institut, 5232 Villigen PSI, Switzerland benedikt.roesner@psi.ch Search for other works by this author on: Oxford Academic Google Scholar Frieder Koch, Koch Florian Döring, Döring Vitaliy A Guzenko, Guzenko Markus Meyer, Meyer Department Chemistry and Pharmacy, FAU Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany Joshua L Ornelas, Ornelas Andreas Späth, Späth Rainer H...
Three vinylene linked diketopyrrolopyrrole based donor-acceptor (D-A) copolymers have been synthesized with phenyl, thienyl, and selenyl units as donors. Optical electronic properties were investigated UV-vis absorption spectroscopy, cyclic voltammetry, near edge X-ray organic field effect transistor (OFET) measurements, density functional theory (DFT) calculations. electrochemical band gaps decrease in the order selenyl. Only phenyl-based polymers are nonplanar, but main contributor to...
We demonstrate organic photovoltaic devices with extremely low synthetic complexity by pairing poly(3-hexithiophene) (P3HT) a novel non-fullerene acceptor (NFA) bis(tri-<italic>n</italic>-propylsilyl oxide) silicon phthalocyanine ((3PS)<sub>2</sub>-SiPc).