A5082910090- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Recycling and Waste Management Techniques
- Microplastics and Plastic Pollution
- biodegradable polymer synthesis and properties
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Chemistry and Chemical Engineering
- Semiconductor materials and interfaces
- Carbon dioxide utilization in catalysis
- Additive Manufacturing and 3D Printing Technologies
- Sensor Technology and Measurement Systems
- Solid State Laser Technologies
- Laser Design and Applications
- Green IT and Sustainability
- solar cell performance optimization
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Organometallic Complex Synthesis and Catalysis
- Catalytic Cross-Coupling Reactions
- Laser Material Processing Techniques
- Advanced Electrical Measurement Techniques
- Silicon and Solar Cell Technologies
BASF (Germany)
2015-2025
Robert Bosch (Germany)
2022
Max Planck Institute for Polymer Research
2011-2014
Max Planck Society
2011-2014
University of Freiburg
2011
Leipzig University
1940
Leipzig/Halle Airport
1940
The dependence of the thin film morphology and excited-state dynamics for low-bandgap donor-acceptor copolymer poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) in pristine films blends (1:2) with [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) on use solvent additive 1,8-octanedithiol (ODT) is studied by solid-state nuclear magnetic resonance (NMR) spectroscopy broadband visible near-infrared pump-probe transient...
New polymers with high electron mobilities have spurred research in organic solar cells using polymeric rather than fullerene acceptors due to their potential of increased diversity, stability, and scalability. However, all‐polymer struggled keep up the steadily increasing power conversion efficiency polymer:fullerene cells. The lack knowledge about dominant recombination process as well missing concluding picture on role semi‐crystalline microstructure conjugated free charge carrier...
Abstract Following the circular economy hierarchy of reduce and reuse, recycling is third layer to close loops for materials decouple their value from consumption. Polymeric (“plastics”) are in principle well suited recycling, as they can be reprocessed with relatively low energy input a material, cleaved back into monomers or converted feedstock. Today, these approaches still fall short quantitatively diverting waste towards reuse. This perspective describes industry challenges high...
We report a new class of C∧C* platinum(II) complexes in which excimer formation enhances the quantum yield while shortening phosphorescence lifetime. Selective excitation monomer or dimer could be achieved at different wavelengths. These exhibit strong phosphorescent emissions blue part visible spectrum around 450 nm with yields up to 93%. The emission behavior is controlled through steric demand substituents 2,4-pentanedione ligand. see dual high photoluminescence (PLQY) from monomeric and...
Circular Economy This frontispiece reflects upon the perspective article 2100488 by Hannah Mangold and Bernhard von Vacano. Plastics waste on left side, used as feedstock in chemical recycling, can be circled back into demanding engineering plastics applications, for example an electric vehicle housing battery electronics, connectors cables (Image credit BASF SE).
Branched conjugated architectures should possess the advantage of isotropic charge transport compared to conventional linear polymers, as for example poly(3-hexylthiophene) (P3HT) which is commonly used in organic solar cells. This contribution investigates optoelectronic properties branched poly(thiophene)s p3T and p4T synthesized a straightforward one-pot procedure by oxidative coupling trithiophene tetrathiophene monomers with FeCl3. These polymers can be regarded model systems ideal...
The charge generation and recombination processes following photoexcitation of a low-bandgap polymer:perylene diimide photovoltaic blend are investigated by transient absorption pump–probe spectroscopy covering dynamic range from femto- to microseconds get insight into the efficiency-limiting photophysical processes. photoinduced electron transfer polymer perylene acceptor takes up several tens picoseconds, its efficiency is only half that in polymer:fullerene blend. This reduces...
Charge generation and recombination processes occurring in ternary photoactive copolymer:copolymer:fullerene blends consisting of different mixing ratios between entirely amorphous semi-crystalline PPE-PPV copolymers are investigated by transient absorption pump-probe pump-push photocurrent spectroscopy. The experiments reveal that an excess polymer facilitates exciton dissociation into free charge carriers, slows down geminate recombination, suppresses non-geminate leading to increased...
Abstract Assessing the inhalation hazard of microplastics is important but necessitates sufficient quantity that are representative and respirable (<4 µm). Common plastics not typically manufactured in such small sizes. Here, solvent precipitation used to produce test materials from thermoplastics polyurethane (TPU), polyamide (PA‐6), polyethylene terephthalate (PET), low‐density (LDPE). Complementary methods verified desired size range achieved both number metrics mass metrics. To assess...
Abstract The exciton dissociation, recombination, and charge transport of bulk heterojunction organic photovoltaic cells (OPVs) is influenced strongly by the nanomorphology blend, such as grain size molecular packing. Although it well known that polymers based on amorphous poly( p ‐phenylenevinylene) (PPV) have a fundamental limit to their efficiency because low carrier mobility, which leads increased recombination unbalanced extraction, herein, we demonstrate issue can be overcome forming...
Abstract Für eine nachhaltige Kreislaufwirtschaft müssen Polymere auf rezyklierte und biobasierte Rohstoffe umgestellt werden, sie bezüglich der Emissionen CO 2 ‐neutral werden. Dies gilt nicht nur für Strukturpolymere, z. B. in Verpackungen oder technischen Anwendungen, sondern auch Funktionspolymere flüssigen Formulierungen: Klebstoffen Schmiermitteln, als Verdickungs‐ Dispersionsmittel. Am Ende ihrer Lebensdauer entweder gesammelt technisch rezykliert werden biologisch abbaubar sein, wenn...
In this paper, two OLED device concepts are introduced. First, classical phosphorescent green carbene emitters with unsurpassed lifetime, combined low voltage and high efficiency presented the associated optimized stacks explained. Second, a path towards highly efficient, long-lived deep blue systems is shown. The efficiencies can be reached by having charge-recombination on emitter while at same time short emissive lifetimes realized fast energy transfer to fluorescent emitter, which...
Zusammenfassung In den letzten Dekaden waren Kunststoffe so erfolgreich, dass ihre produzierte Menge überproportional gewachsen ist. Da die Entsorgung weltweit nicht Schritt gehalten hat, hat sich das Müllproblem verschärft. einer Kreislaufwirtschaft werden dagegen als Müll in der Umwelt abgelagert oder zu CO 2 verbrannt, sondern Einmalanwendungen vermieden und generell Werkstoff Rohstoff wiederverwendet. viele Abhängigkeiten bestehen, muss Nachhaltigkeit von jedem Teil des gesamten Zyklus,...
The optimization of current materials for organic solar cells is complicated by the fact that individual modifications concurrently affect several efficiency-limiting factors. For example, in donor-acceptor copolymers, chemical light absorption properties alters charge transport and not necessarily desired direction. This interdependency frustrates step-wise maximum power conversion efficiency. In this letter, we introduce a terpolymer which demonstrate effectively decouples onto separate...
Abstract Microplastic research has been increasing due to the uncertainty of potential effects on environment and human health. However, microplastic references are currently missing. Not only is there a lack also diversity in polymer type for references, especially toxicological studies. In specific, inhalation studies must rely microplastics that respirable and/or inhalable (&lt; 10 µm) result outcomes. Therefore, this project, we focus using solvent precipitation produce from TPU,...