A5068177057- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Force Microscopy Techniques and Applications
- Thin-Film Transistor Technologies
- Electron and X-Ray Spectroscopy Techniques
- Photonic and Optical Devices
- Chalcogenide Semiconductor Thin Films
- Gold and Silver Nanoparticles Synthesis and Applications
- Phase-change materials and chalcogenides
- Medical Imaging Techniques and Applications
- Nanowire Synthesis and Applications
- Optical Coatings and Gratings
- Organic and Molecular Conductors Research
- Nanofabrication and Lithography Techniques
- TiO2 Photocatalysis and Solar Cells
- Advanced Fluorescence Microscopy Techniques
- Machine Learning in Materials Science
- Nuclear Physics and Applications
- Luminescence and Fluorescent Materials
- Fluid Dynamics and Thin Films
- Organic Light-Emitting Diodes Research
- Molecular Junctions and Nanostructures
- Silicon Nanostructures and Photoluminescence
Friedrich-Alexander-Universität Erlangen-Nürnberg
2016-2024
Abstract Ternary blends with broad spectral absorption have the potential to increase charge generation in organic solar cells but feature additional complexity due limited intermixing and electronic mismatch. Here, a model system comprising polymers poly[5,5‐bis(2‐butyloctyl)‐(2,2‐bithiophene)‐4,4‐dicarboxylate‐alt‐5,5‐2,2‐bithiophene] (PDCBT) PTB7‐Th PC 70 BM as an electron accepting unit is presented. The power conversion efficiency (PCE) of ternary clearly surpasses performance either...
We demonstrate elastically filtered 3D Electron Diffraction (3D ED) as a powerful alternative technique to Grazing Incidence Wide-Angle X-ray Scattering (GIWAXS) for quantitatively characterizing the structure of organic semiconductor films. Using model material system solvent vapor annealed DRCN5T:PC71BM thin film, which is employed in solar cells (OSCs), we extract structural data obtained from ED and compare with that GIWAXS, utilizing both laboratory synchrotron sources. Quantitative...
<bold>SiNC-1</bold>is successfully applied in ternary/quaternary devices, accompanied by charge transfer/transport mechanism studies.
Organic solar cells based on multinary components are promising to further boost the device performance. The complex interplay of morphology and functionality needs investigations. Here, we report a systematic study evolution prototype ternary systems upon adding sensitizers featuring similar chemical structures but dramatically different crystallinity, namely poly(3-hexylthiophene) (P3HT) indene-C60-bis-adduct (ICBA) blends with...
Solvent vapor annealing (SVA) has been shown to significantly improve the device performance of organic bulk‐heterojunction solar cells, yet mechanisms linking nanomorphology, crystallinity active layer, and are still largely missing. Here, tackled by correlating evolution crystallinity, with advanced transmission electron microscopy methods systematically. Model system DRCN5T:PC 71 BM blends SVA treated four solvents differing in their donor acceptor solubilities. The choice solvent...
PCE is improved owing to the enhanced <italic>J</italic><sub>SC</sub>, resulting from larger light harvesting and higher charge generation.
Interest in organic solar cells (OSCs) is constantly rising the field of photovoltaic devices. The device performance relies on bulk heterojunction (BHJ) nanomorphology, which develops during drying process and additional post-treatment. This work investigates effect thermal annealing (TA) all-small molecule DRCN5T:PC
Elucidating the complex materials distribution in active layers of ternary organic solar cells is one greatest challenges field photovoltaics. Knowledge nanomorphology key to understanding photophysical processes (e.g., charge separation, adjustment recombination mechanism, and suppression radiationless energetic losses) thus improving device performance. Herein, for first time, successful discrimination spatial mapping layer components a cell are demonstrated using analytical transmission...
Abstract It is demonstrated by a detailed structural analysis that the crystallinity and efficiency of small molecule based organic photovoltaics can be tuned solvent vapor annealing (SVA). Blends made donor 2,2′-[(3,3′″,3″″,4′-tetraoctyl[2,2′:5′,2″:5″,2′″:5′″,2″″-quinquethiophene]-5,5″″-diyl)bis[(Z)-methylidyne(3-ethyl-4-oxo-5,2-thiazolidinediylidene)]]bis-propanedinitrile (DRCN5T) acceptor [6,6]-phenyl C71 butyric acid methyl ester (PC 71 BM) were annealed using vapors with either high...
GaN microrods are used as a basis for subsequent InGaN quantum well (QW) and dot deposition by metal-organic vapor phase epitaxy. The coverage of the shell along sidewall rods is dependent on rod growth time complete obtained shorter times. Transmission electron microscopy measurements performed to reveal structural properties layer facet top facet. presence layers in microrod surface will be discussed with respect growth. A detailed model presented explaining formation multiple SiN partial...
Abstract In this work, a widely applicable routine to characterize the core, surface, stability, and optical properties of CdSe/CdS/ZnS core–shell–shell nanorods after multiple growth steps is established. First, size, shape, shell thickness are characterized by transmission electron microscopy (TEM), analytical ultracentrifugation (AUC), small angle X‐ray/neutron scattering (SAXS/SANS). next step, Fourier‐transform infrared (FT‐IR) spectroscopy, thermogravimetric analysis (TGA), SANS...
Currently we are performing in situ thermal annealing experiments the TEM enabling simultaneous observation of nanoscale phase separation and formation an interpenetrating network donor acceptor phases as a function time temperature.This gives us new insights into kinetics BHJ film formation.
Since the earliest days of liquid-phase epitaxy (LPE) research, substrate stability has been a prerequisite for investigating nucleation and epitaxial growth. For flux- melt-growth LPE, soluble substrates have always viewed as problematic difficult. However, solution-growth LPE transforms this disadvantage into benefit by facilitating creation graded interfaces. In study, we investigated growth solution-grown in evaporation mode CsPbBr3 on freshly cleaved NaCl single-crystal substrates. Only...
Abstract Metal organic vapor phase epitaxy is used to grow gallium arsenide (GaAs) nanocrystals (NCs) on germanium (Ge) templates nanoscopic silicon (Si) threads prepared by reactive ion etching. Scanning transmission electron microscopy with energy dispersive X‐ray measurements shows an epitaxial growth of the GaAs Ge template that supported Si thread, and doping induced template. On about 60 nm diameter, as‐grown NCs show a very regular rhombic‐dodecahedral outer shape can be explained...
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