A5067036680- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Topological Materials and Phenomena
- Chalcogenide Semiconductor Thin Films
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- 2D Materials and Applications
- Solid-state spectroscopy and crystallography
- Organic and Molecular Conductors Research
- Inorganic Chemistry and Materials
- Conducting polymers and applications
- Nuclear materials and radiation effects
- Rare-earth and actinide compounds
- Quantum and electron transport phenomena
- Coral and Marine Ecosystems Studies
- Physics of Superconductivity and Magnetism
University of Stuttgart
2022-2024
Interface-induced nonradiative recombination losses at the perovskite/electron transport layer (ETL) are an impediment to improving efficiency and stability of inverted (p-i-n) perovskite solar cells (PSCs). Tridecafluorohexane-1-sulfonic acid potassium (TFHSP) is employed as a multifunctional dipole molecule modify surface. The solid coordination hydrogen bonding efficiently passivate surface defects, thereby reducing recombination. induced positive between ETLs improves energy band...
Abstract Metal halide perovskite solar cells (PSCs) have emerged as an important direction for photovoltaic research. Although the power conversion efficiency (PCE) of lead‐based PSCs has reached 25.7%, still toxicity Pb remains one main obstacle commercial adoption. Thus, to address this issue, Pb‐free perovskites been proposed. Among them, tin‐based promising candidates. Unfortunately, fast oxidation Sn 2+ 4+ leads low stability and efficiency. Many strategies implemented these challenges...
Abstract This work introduces a simplified deposition procedure for multidimensional (2D/3D) perovskite thin films, integrating phenethylammonium chloride (PEACl)‐treatment into the antisolvent step when forming 3D perovskite. simultaneous and passivation strategy reduces number of synthesis steps while simultaneously stabilizing halide film improving photovoltaic performance resulting solar cell devices to 20.8%. Using combination multimodal in situ additional ex characterizations, it is...
The properties of kagome metals are governed by the interdependence band topology and electronic correlations resulting in remarkably rich phase diagrams. Here, we study temperature evolution bulk structure antiferromagnetic metal FeGe using infrared spectroscopy. We uncover drastic changes low-energy interband absorption at 100 K structural transition that has been linked to a charge-density-wave (CDW) instability. explain this effect minuscule Fe displacement plane, which results parallel...
All-inorganic perovskites, such as CsPbI2Br, have emerged promising compositions due to their enhanced thermal stability. However, they face significant challenges susceptibility humidity. In this work,...
Abstract Metal halide perovskite solar cells may work for application in extreme temperatures, such as those experienced under extraterrestrial conditions. However, device performances temperatures are poorly investigated. This systematically explores the performance of between −160 and 150 °C. In situ grazing‐incidence wide‐angle X‐ray scattering discloses phase transition crystal disordering dominant factors temperature‐dependent efficiency deterioration. It is shown that lattice strain...
Interfaces in perovskite solar cells play a crucial role their overall performance, and therefore, detailed fundamental studies are needed for better understanding. In the case of classical n-i-p architecture, TiO2 is one most used electron-selective layers can induce chemical reactions that influence performance device stack. The interfacial properties at TiO2/perovskite interface often neglected, owing to difficulty accessing this interface. Here, we use X-rays variable energies study...
Studying the magnetic ground states of frustrated antiferromagnets provides unique insight into stability quantum spin liquids, even if anticipated state is not realized towards T = 0. Particularly relevant are structural modifications setting in at temperatures where correlations come play. Here we explore lattice dynamics Y-kapellasite (Y3Cu9(OH)19Cl8) single crystals by infrared spectroscopy combination with ab initio calculations. We observe significant changes phonon spectra Ts 32 K,...
The properties of kagome metals are governed by the interdependence band topology and electronic correlations resulting in remarkably rich phase diagrams. Here, we study temperature evolution bulk structure antiferromagnetic metal FeGe using infrared spectroscopy. We uncover drastic changes low-energy interband absorption at 100 K structural transition that has been linked to a charge-density-wave (CDW) instability. explain this effect minuscule Fe displacement plane, which results parallel...
The heavy-fermion compound ${\mathrm{CeRhIn}}_{5}$ can be tuned through a quantum critical point, when In is partially replaced by Sn. this way additional charge carriers are introduced and the antiferromagnetic order gradually suppressed to zero temperature. Here we investigate temperature-dependent optical properties of $\mathrm{CeRh}{({\mathrm{In}}_{1\ensuremath{-}x}{\mathrm{Sn}}_{x})}_{5}$ single crystals for $x=4.4%$, 6.9%, 9.8%. With increasing Sn concentration infrared conductivity...
The natural van der Waals heterostructure 4H$_b$-TaS$_2$ composed of alternating 1T- and 1H-TaS$_2$ layers serves as a platform for investigating the electronic correlations layer-dependent properties novel quantum materials. temperature evolution conductivity spectra $\sigma(\omega)$ obtained through infrared spectroscopy elucidates influence band modifications associated with charge-density-wave (CDW) superlattice on 1T layer, resulting in room-temperature energy gap, $\Delta_{\rm...