A5080892281- Perovskite Materials and Applications
- Fuel Cells and Related Materials
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Advanced Battery Materials and Technologies
- Advanced Photocatalysis Techniques
- Polyoxometalates: Synthesis and Applications
- Covalent Organic Framework Applications
- Silicon and Solar Cell Technologies
- Advanced Memory and Neural Computing
- Luminescence Properties of Advanced Materials
- Membrane Separation and Gas Transport
- Material Dynamics and Properties
- Catalytic Processes in Materials Science
- Organic Electronics and Photovoltaics
- solar cell performance optimization
- Electrocatalysts for Energy Conversion
- Magnetic and transport properties of perovskites and related materials
- Advanced Measurement and Metrology Techniques
- Fullerene Chemistry and Applications
- 2D Materials and Applications
- Optical measurement and interference techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Laser and Thermal Forming Techniques
- Theoretical and Computational Physics
University of Bayreuth
2021-2025
Czech Academy of Sciences, Institute of Physics
2025
Perovskite films feature unique optoelectronic properties, rendering them promising for electronic devices. The properties depend on the morphology a broad range of length scales from nanometers to millimeters, influenced by variety factors. However, controlling is challenging. A tailored supramolecular additive, N, N'-bis(2-aminoethyl) terephthalamide developed control intermediate and perovskite crystallization methyl ammonium lead iodide (MAPbI3) enhance thermal moisture stability in...
Stability is one of the most important challenges facing material research for organic solar cells (OSC) on their path to further commercialization. In high-performance system PM6:Y6 studied here, we investigate degradation mechanisms inverted photovoltaic devices. We have identified two distinct pathways: requires presence both illumination and oxygen features a short-circuit current reduction, other induced thermally marked by severe losses open-circuit voltage fill factor. focus our...
Polymer electrolyte membrane fuel cells (PEMFCs) operating at temperatures above 100 °C offer an interesting opportunity for heavy-duty applications. Especially intermediate between 110 and 130 (IT-PEMFC), faster reaction kinetics, higher tolerance to impurities, water flooding as well improved heat management of the cell system have been observed. Perfluorosulfonic acid-based membranes (PFSAs) can be modified by incorporating additives or (nano)particle filler systems improve their thermal...
Sulfonated, cross-linked porous polymers are promising frameworks for aqueous high-performance electrolyte-host systems electrochemical energy storage and conversion. The offer high proton conductivities, excellent chemical mechanical stabilities, straightforward water management. However, little is known about mass transport mechanisms in such nanostructured hosts. We report on the synthesis postsynthetic sulfonation of an aromatic framework (SPAF-2) with a 3D-interconnected nanoporosity...
Abstract To develop a detailed understanding about halide perovskite processing from solution, the crystallization processes are investigated during spin coating and slot‐die of MAPbI 3 at different evaporation rates by simultaneous in situ photoluminescence, light scattering, absorption measurements. Based on time evolution optical parameters it is found that for both methods initially solvent‐complex‐structures form, followed crystallization. The latter proceeds two stages coating, while...
Photomemristors have been regarded as one of the most promising candidates for next-generation hardware-based neuromorphic computing due to their potentials fast data transmission and low power consumption. However, intriguingly, so far, photomemristors seldom display truly nonvolatile memory characteristics with high light sensitivity. Herein, we demonstrate ultrasensitive utilizing two-dimensional (2D) Ruddlesden-Popper (RP) perovskites a highly polar donor-acceptor-type push-pull organic...
Abstract Halide perovskites have received an immense attention in the field of optoelectronics due to their outstanding photophysical properties. But so far, lead‐based halide still account for most research, which raises concerns lead toxicity. Herein, a new design strategy is proposed utilizing super large, energetically higher singlet and triplet energy levels aromatic organic cation incorporate into perovskite structure, forming ultra‐stable high‐performance 2D/3D (quasi‐2D) perovskite....
Ionic liquids, such as BMIMBF4, are added to mixed halide perovskites prevent phase segregation and increase stability, but exact mechanisms changing kinetics currently unclear. Here, X-ray diffraction, nuclear magnetic resonance, photoluminescence spectroscopy used in situ under dark conditions follow thermally driven mixing processes forming MAPbI3–xBrx from physical mixtures of MAPbI3 MAPbBr3 powders with without BMIMBF4. Halide migration is significantly accelerated BMIMBF4 compared...
Crystalline and 3D continuous mesoporous quaternary CsTaWO 6 semiconductors are prepared with different degrees of long‐range periodic order local order, respectively, to investigate the influence pore on photocatalytic performance in hydrogen evolution photocatalysts. The degree mesopores is changed by modifying ratio between metal precursors soft polymer template poly(isoprene‐ b ‐styrene‐ ‐ethylene oxide) (PI‐ ‐PS‐ ‐PEO; ISO) sol–gel synthesis. Long‐range found have no appreciable...
Preparing halide perovskite films by solvent‐free, powder‐based processing approaches currently attracts more and attention. However, working solar cells employing dry, thin films, have not been demonstrated so far. Herein, are presented where the absorber layer is prepared transferring readily synthesized powders into a compact film using fully dry‐powder‐processing concept. Compact deposited via an optimized powder aerosol deposition (PAD) process. Pressing at 120 °C further improves...
We present a new procedure for the delamination of vermiculites in organic solvents to make inexpensive yet high performing nanocomposite coatings biodegradable food packaging.
X-ray photon correlation spectroscopy (XPCS) is a versatile tool to measure dynamics on the nanometer micrometer scale in bulk samples. XPCS has also been applied grazing incidence (GI) geometry examine of surface layers. However, considering GI scattering experiments more universally, leads superposition signals due reflection and refraction effects, known from distorted-wave Born approximation (DWBA). In this paper, impact these effects analysis determined experimentally by measuring...
Pore ordering In article number 2200184, Roland Marschall, and co-workers investigated mesoporous semiconductor materials for photocatalytic hydrogen production, concerning the influence of pore on activity. Showing that a highly ordered system is not necessary, heterogeneity as well connectivity can have major higher generation.
The commercialization of PEM fuel cells offers a promising opportunity to overcome our dependence on fossil fuels and provides an attractive alternative for automotive stationary power applications.[1] However, PEMFCs are still costly in production, with the main cost factor due fabrication perfluorosulfonic acid (PFSA)-based proton exchange membrane noble metal catalysts.[2,3] Recycling these components could increase economic attractiveness PEMFCs. while high resistance ionomer thermal...
Polymer electrolyte membrane fuel cells (PEMFC) are lagging in commercialization due to the high cost of noble metal catalysts (e.g., Pt) and perfluorosulfonic acid-based (PFSA) membranes. Recycling reusing these components at end life (EoL) could increase viability decrease environmental impact PEMFCs. In this work, we demonstrate an environmentally friendly method for recycling PFSA membranes based on a hydrothermal treatment using only water as reactant, which is essential upscaling...
To develop a detailed understanding about halide perovskite processing from solution, the crystallization processes are investigated during spin coating and slot-die of MAPbI3 at different evaporation rates by simultaneous in situ photoluminescence, light scattering, absorption measurements. Based on time evolution optical parameters it is found that for both methods initially solvent-complex-structures form, followed crystallization. The latter proceeds two stages coating, while only one...