A5060819875- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Silicon and Solar Cell Technologies
- Chalcogenide Semiconductor Thin Films
- Thin-Film Transistor Technologies
- Polymer Surface Interaction Studies
- Advanced Sensor and Energy Harvesting Materials
- Advanced Thermoelectric Materials and Devices
- Solid-state spectroscopy and crystallography
- Luminescence and Fluorescent Materials
- Advanced Photocatalysis Techniques
- Electrospun Nanofibers in Biomedical Applications
- Block Copolymer Self-Assembly
- Transition Metal Oxide Nanomaterials
- Supramolecular Self-Assembly in Materials
- Advanced Battery Materials and Technologies
- Copper-based nanomaterials and applications
- TiO2 Photocatalysis and Solar Cells
- Microplastics and Plastic Pollution
- Biochemical and Structural Characterization
- Silk-based biomaterials and applications
- Polyoxometalates: Synthesis and Applications
- Integrated Circuits and Semiconductor Failure Analysis
Technical University of Munich
2020-2025
Material (Belgium)
2021
Max Planck Computing and Data Facility
2021
Institut für Technische und Angewandte Physik (Germany)
2021
Abstract Polarized light is critical for a wide range of applications, but usually generated by filtering unpolarized light, which leads to substantial energy losses and requires additional optics. Here we demonstrate the direct emission linearly polarized from light-emitting diodes made CsPbI 3 perovskite nanoplatelet superlattices. The use solvents with different vapour pressures enables self-assembly nanoplatelets fine control over their orientation (either face-up or edge-up) therefore...
Abstract Highly sensitive and humidity‐resistive detection of the most common physical stimuli is primary importance for practical application in real‐time monitoring. Here, a simple yet effective strategy reported to achieve highly humidity‐stable hybrid composite that enables simultaneous accurate pressure temperature sensing single sensor. The improved electronic performance due enhanced planarity poly (3,‐4ethylenedioxythiophene) (PEDOT) charge transfer between PEDOT:polystyrene...
The experimental replicability of highly efficient perovskite solar cells (PSCs) is a persistent challenge faced by laboratories worldwide. Although trace impurities in raw materials can impact the reproducibility high-performance PSCs, situ study how affect film growth never investigated. Here, light shed on inevitable water contamination lead iodide (PbI
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...
A real time study of the active layer morphology evolution with different acceptors during OSC operation under vacuum atmosphere.
Organic thermoelectric thin films are investigated in terms of their stability at elevated operating temperatures. Therefore, the electrical conductivity ethyl-3-methylimidazolium dicyanamide (EMIM DCA) post-treated poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is measured over 4.5 h heating 50 or 100 °C for different EMIM DCA concentrations. The changes performance correlated with film morphology, as evidenced situ grazing-incidence small-angle X-ray scattering...
In times of climate change and resource scarcity, researchers are aiming to find sustainable alternatives synthetic polymers for the fabrication biodegradable, eco-friendly, and, at same time, high-performance materials. Nanocomposites have ability combine several favorable properties different materials in a single device. Here, we evaluate suitability two kinds inks containing silver nanowires fast, facile, industrial-relevant types cellulose-based nanowire electrodes via layer-by-layer...
Abstract An environmentally friendly as well scalable synthesis route of nanostructured titania thin films is interest for many state‐of‐the‐art devices, from solar cells to battery materials. Beta‐lactoglobulin (ß‐lg) enables water‐based and tunable film templating, allowing different domain sizes, porosities, morphologies. When printed with a slot‐die coater, the can be tailored specific applications simple changes solution chemistry. Films at acidic pH conditions form significantly final...
We describe an in situ-polymerized conformal thin layer coating of narrow band gap carbon-rich carbon nitride (NBG-CRCN) on titania nanorod arrays to design a binary semiconductor heterojunction photocatalyst. The situ polymerization creates strong interaction between the TiO2 substrate and film, which prevents leaching CRCN liquid electrolytes. A unique aspect our work is developing easy inexpensive technique for heteroepitaxial growth mechanically photochemically stable films with intimate...
Solution processing of hybrid perovskite semiconductors is a highly promising approach for the fabrication cost-effective electronic and optoelectronic devices. However, challenges with this lie in overcoming controllability film morphology reproducibility device efficiencies. Here, facile practical aging treatment (AT) strategy reported to modulate crystal growth produce sufficiently high-quality thin films improved homogeneity full-coverage morphology. The resulting AT-films exhibit fewer...
There is an increasing demand for transient materials with a predefined lifetime like self-erasing temporary electronic circuits or biomedical implants. Chemically fueled are example of such materials; they emerge in response to chemical fuel, and autonomously decay as deplete it. However, these suffer from slow, typically first order profile. That means that over the course material's lifetime, its properties continuously change until it fully decayed. Materials have sharp on-off...
Vacuum-processed organic solar cells (VP-OSCs) possess many advantages for scalability. However, as the academic community focusses on high performing solution-processed OSCs, detailed studies about relation between morphology and device characteristics in VP-OSCs are rare. Here, we present a study model donor/fullerene VP-OSC system deposited at different substrate temperatures. Substrate heating results increases current density fill factor (FF). The changes characterised by...
Abstract Based on a diblock‐copolymer templated sol–gel synthesis, germanium nanocrystals (GeNCs) are introduced to tailor mesoporous titania (TiO 2 ) films for obtaining more efficient anodes photovoltaic applications. After thermal annealing in air, the hybrid with different GeNC content investigated and compared undergoing an argon atmosphere annealing. The surface inner morphologies of TiO /GeO x nanocomposite probed via scanning electron microscopy grazing‐incidence small‐angle X‐ray...
Spray deposition is a scalable and cost-effective technique for the fabrication of magnetic hybrid films containing diblock copolymers (DBCs) nanoparticles. However, it challenging to obtain spray-deposited anisotropic without using external fields. In present work, spray applied prepare perpendicular by controlling orientation strontium hexaferrite nanoplatelets inside ultra-high-molecular-weight DBC polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) films. During deposition, evolution...
The water vapor-induced swelling, as well subsequent phase-transition kinetics, of thin films a diblock copolymer (DBC) loaded with different amounts the salt NaBr, is investigated in situ. In dilute aqueous solution, DBC features an orthogonally thermoresponsive behavior. It consists zwitterionic poly(sulfobetaine) block, namely, poly(4-(N-(3′-methacrylamidopropyl)-N,N-dimethylammonio) butane-1-sulfonate) (PSBP), showing upper critical solution temperature, and nonionic...
Ionic liquid (IL) post-treatment of poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) thin films with ethyl-3-methylimidazolium dicyanamide (EMIM DCA), allyl-3-methylimidazolium (AMIM and 1-ethyl-3-methylimidazolium tetracyanoborate TCB) is compared. Doping level modifications PEDOT are characterized using UV-Vis spectroscopy directly correlate the observed Seebeck coefficient enhancement. With conductive atomic force microscopy (c-AFM) authors investigate changes in...
Electrode materials for application in lithium‐ion batteries are commonly probed by X‐ray diffraction (XRD) to investigate their crystalline structure. Grazing incidence wide‐angle scattering (GIWAXS) is an extension XRD since in‐plane structures also accessible. Additionally, with grazing small‐angle (GISAXS), morphological information on the nanoscale can be revealed. In this work, nanostructure of battery electrodes, which consist lithium iron phosphate (LiFePO 4 ) as active material,...
Vacuum-processed organic solar cells (VP-OSCs) possess many advantages for scalability. However, as the academic community focusses on high performing solution-processed OSCs, detailed studies about relation between morphology and device characteristics in VP-OSCs are rare. Here, we present a study model donor/fullerene VP-OSC system deposited at different substrate temperatures. Substrate heating results increases current density fill factor (FF). The changes characterised by...
Superlattice deformation in PbS quantum dot thin films introduced by uniaxial strain: In situ GISAXS study on the correlation of morphology and photoluminescence.
The crystallinity and morphology of polymer fullerene have a profound influence on the performance bulk heterojunction (BHJ) organic photovoltaic devices. poor compatibility donor acceptor molecules in BHJs hinders further improvement device stability solar cells. In this work, conjugated PBDTTPD-COOH is introduced as third component into BHJ films PTB7-Th:PC71BM PffBT4T-2OD:PC71BM to improve morphology. both polymers enhanced more face-on orientated crystals are observed corresponding...
Abstract Given the broad use of nanostructured crystalline titania films, an environmentally friendly and more sustainable synthesis route is highly desirable. Here, a water‐based, low‐temperature presented to synthesize foam‐like films. A pearl necklace‐like nanostructure introduced as tailored morphology via biotemplating with major bovine whey protein ß‐lactoglobulin (ß‐lg). It shown that crystallization in brookite‐anatase mixed phase promoted spray deposition at comparatively low...