A5046302897- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Solid State Laser Technologies
- Nanocluster Synthesis and Applications
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Magneto-Optical Properties and Applications
- Strong Light-Matter Interactions
- Photorefractive and Nonlinear Optics
- Conducting polymers and applications
- Inorganic Chemistry and Materials
- Axial and Atropisomeric Chirality Synthesis
- Thermal Expansion and Ionic Conductivity
- Photoreceptor and optogenetics research
- Optical properties and cooling technologies in crystalline materials
- Advanced Fiber Laser Technologies
- Advancements in Solid Oxide Fuel Cells
Heidelberg University
2023-2025
Schott (Germany)
2022-2025
Technical University of Munich
2022-2025
Karlsruhe Institute of Technology
2025
Sichuan University
2019-2022
Hybrid perovskite semiconductor materials are predicted to lock chirality into place and encode asymmetry their electronic states, while softness of crystal lattice accommodates strain maintain high quality with low defect densities, necessary for luminescence yields. We report photoluminescence quantum efficiencies as 39% degrees circularly polarized up 52%, at room temperature, in the chiral layered hybrid lead-halide perovskites (R/S/Rac)-3BrMBA 2 PbI 4 [3BrMBA =...
Hybrid organic-inorganic networks that incorporate chiral molecules have attracted great attention due to their potential in semiconductor lighting applications and optical communication. Here, we introduce a organic molecule (R)/(S)-1-cyclohexylethylamine (CHEA) into bismuth-based lead-free structures with an edge-sharing octahedral motif, synthesize (R)/(S)-CHEA4Bi2BrxI10-x crystals thin films. Using single-crystal X-ray diffraction measurements density functional theory calculations,...
The transformation of colloidal semiconductor magic-size clusters (MSCs) from zinc to cadmium chalcogenide (ZnE CdE) at low temperatures has received scant attention. Here, we report the first room-temperature evolution CdE MSCs ZnE samples and our interpretation pathway. We show that when prenucleation stage are mixed with oleate (Cd(OA)2), evolve; without this mixing, develop. When Cd(OA)2 mixed, also form. propose reacts precursor compounds (PCs) but not directly MSCs. cation exchange...
Perovskite solar cells (PSCs) have achieved competitive power conversion efficiencies compared with established cell technologies. However, their operational stability under different external stimuli is limited, and the underlying mechanisms are not fully understood. In particular, an understanding of degradation from a morphology perspective during device operation missing. Herein, we investigate PSCs CsI bulk modification CsI-modified buried interface AM 1.5G illumination 75 ± 5% relative...
Abstract Reduced‐dimensional perovskites (RDPs) have advanced perovskite optoelectronic devices due to their tunable energy landscape, structure, and orientation. However, the origin of structural photophysical property changes when moving from low‐dimensional high‐dimensional RDPs remains be understood. This study systematically reveals properties slot‐die‐coated Dion‐Jacobson (DJ) Ruddlesden‐Popper (RP) with different dimensionalities. RP lower dimensionality ( n = 2) exhibit a dominant 2...
Abstract Controlling the formation of hybrid perovskite thin films is crucial in obtaining high‐performance optoelectronic devices, since factors like morphology and film thickness have a profound impact on film's functionality. For light‐emitting applications grain sizes sub‐micrometer‐range previously shown enhanced brightness. It therefore to develop simple, yet reliable methods produce such films. Here, solution‐based synthesis protocol for on‐substrate MAPbBr 3 (MA = methylammonium)...
Abstract Metal halide perovskites hold promise for nonepitaxial laser diodes, yet, continuous‐wave (CW) optically pumped (photonic) lasing in CsPbBr 3 remains elusive despite its superior thermal‐ and photo‐stability among the perovskite family. This work reports on vertical cavity surface emitting lasers with low thresholds (1.3 µJ cm − 2 ) at nanosecond pumping remarkable stability. Furthermore, electrically switchable gain is achieved assisted (EAOPL) devices by leveraging ion migration....
We report our investigation on the transformation pathway from precursor compounds (PCs) to magic-size clusters (MSCs) for semiconductor ZnS. show, first time, a synthetic approach ZnS MSCs in single-ensemble form exhibiting optical absorption peaking at 269 nm. thus symbolize as MSC-269. The synthesis was performed with zinc oleate (Zn(OA)2) and elemental sulfur (S) respective Zn S sources 1-octadecene (ODE) reaction medium. Prior addition of S, oleylamine (OLA) is mixed Zn(OA)2. MSC-269...
Abstract Chirality is a desired property in functional semiconductors for optoelectronic, catalytic, and spintronic applications. Here, introducing enantiomerically‐pure 3‐aminobutyric acid (3‐ABA) into thin films of the 1D semiconductor dimethylammonium lead iodide (DMAPbI 3 ) found to result strong circular dichroism (CD) optical absorption. X‐ray diffraction grazing incidence small angle scattering (GISAXS) are applied gain molecular‐scale insights chirality transfer mechanism, which...
Spin–orbit coupling in the electronic states of solution-processed hybrid metal halide perovskites forms complex spin-textures band structures and allows for optical manipulation excited state spin-polarizations. Here, we report that motional narrowing acts on photoexcited spin-polarization CH3NH3PbBr3 thin films, which are doped at percentage-level with Mn2+ ions. Using ultrafast circularly polarized broadband transient absorption spectroscopy cryogenic temperatures, investigate spin...
Antiferromagnets are promising materials for future opto-spintronic applications since they show spin dynamics in the THz range and no net magnetization. Recently, layered van der Waals (vdW) antiferromagnets have been reported, which combine low-dimensional excitonic properties with complex spin-structure. While various methods fabrication of vdW 2D crystals exist, formation large area continuous thin films is challenging because either limited scalability, synthetic complexity, or low...
Abstract The electronic states and exciton binding energies of layered Ruddlesden‐Popper (RP) metal‐halide perovskites can be tailored through changes their chemical composition, yielding multi‐phase systems with complex energy cascades. Ultrafast photoexcitation relaxation transfer dynamics into domains increasing layer number has been reported for these materials. Here, ultrafast optical spectroscopy is used to report an unexpected excitation dependence in mixed‐dimensional benzylammonium...
We perform ultrafast Faraday holographic imaging to track the magnetization dynamics of perovskites in time and space. This interferometric technique, based on off-axis holography, has advantage being shot-noise limited allows us get access both amplitude phase information measured signal. As a result, we can directly retrieve disentangle angular momentum spin components total magnetic moment inside material. Here, present our results Methylammonium Lead Tribromide (MAPbBr3), prototypical...
Reduced-dimensional perovskites (RDPs) have advanced the development of perovskite solar cells (PSCs) due to their tunable energy landscape, structure, and orientation. Thus, we aim for an increase in understanding structure-photophysical properties Dion-Jacobson (DJ) Ruddlesden-Popper (RP) RDPs with different dimensionalities. Our findings reveal that RP lower dimensionality exhibits a dominant n=2 phase, preferential out-of-plane orientation, longer charge carrier lifetime compared DJ...
Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskitesShangpu Liu a, Yang Li b, Ulrich W. Paetzold Stanislav Bodnar Jonathan Zerhoch Andrii Shcherbakov Felix Deschler aa Physikalisch-Chemisches Institut, Universität Heidelbergb Institute of Microstructure Technology; Light Technology Institute, Karlsruhe TechnologyMaterials for Sustainable Development Conference (MATSUS)Proceedings MATSUS Spring 2024 (MATSUS24)#Chiral24 - Chiral Nanomaterials:...