A5048503928- Perovskite Materials and Applications
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Electronic and Structural Properties of Oxides
- Advanced Sensor and Energy Harvesting Materials
- Fuel Cells and Related Materials
- Catalysis for Biomass Conversion
- Moringa oleifera research and applications
- Thermal Radiation and Cooling Technologies
- Biofuel production and bioconversion
- ZnO doping and properties
- Carbohydrate Chemistry and Synthesis
- Optical properties and cooling technologies in crystalline materials
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Materials and Mechanics
- Nanoparticles: synthesis and applications
- Micro and Nano Robotics
- Ga2O3 and related materials
Johannes Kepler University of Linz
2018-2025
University of Stuttgart
2025
Weizmann Institute of Science
2015-2016
Bahir Dar University
2015
The great promise of hybrid organic-inorganic lead halide perovskite (HOIP)-based solar cells is being challenged by its Pb content and sensitivity to water. Here, the impact rain on methylammonium iodide films was investigated exposing such water varying pH values, simulating exposure rain. amount loss determined using both gravimetric inductively coupled plasma mass spectrometry measurements. Using our results, extent environment, in case catastrophic module failure, evaluated. Although...
Abstract High-speed locomotion is an essential survival strategy for animals, allowing populating harsh and unpredictable environments. Bio-inspired soft robots equally benefit from versatile ultrafast motion but require appropriate driving mechanisms device designs. Here, we present a class of small-scale electromagnetic made curved elastomeric bilayers, driven by Lorentz forces acting on embedded printed liquid metal channels carrying alternating currents with voltages several volts in...
The issue of long‐term stability is one the main obstacles challenging progress perovskite solar cells (PSCs). To alleviate this issue, a thorough understanding degradation mechanisms device required. Herein, electrochemical impedance measurements in combination with maximum power point (MPP) tracking are applied to characterize PSCs, aiming gain an charge carrier dynamics photoactive bulk and at contact‐absorber‐interfaces under operation. Electrochemical spectroscopy (EIS) results show...
Biological synthesis of silver nanoparticles (AgNPs) is a green, simple, cost-effective, time-efficient, and single-step method. This study mainly focused on the using essential oil Laggera tomentosa (LTEO) investigates their potential applications. Ultraviolet-Visible (UV-Vis) result showed characteristic Surface Plasmon Resonance (SPR) peak LTEO-AgNPs at 420 nm. Fourier transform infrared (FT-IR) spectroscopy indicated functional groups present in LTEO LTEO-AgNPs. Scanning electron...
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,...
X-ray detectors play a pivotal role in development and advancement of humankind, from far-reaching impact medicine to furthering the ability observe distant objects outer space. While other electronics show adapt flexible lightweight formats, state-of-the-art rely on materials requiring bulky fragile configurations, severely limiting their applications. Lead halide perovskites is one most rapidly advancing novel with success field semiconductor devices. Here, an ultraflexible, lightweight,...
Abstract Outstanding improvement in power conversion efficiency (PCE) over 25% a very short period and promising research developments to reach the theoretical PCE limit of single junction solar cells, 33%, enables organic–inorganic perovskite cells (OIPSCs) gain much attention scientific industrial community. The simplicity production OIPSCs from precursor solution either on rigid or flexible substrates makes them even more attractive for low-cost roll-to-roll processes. Though show as such...
Incorporating large organic cations to form 2D and mixed 2D/3D structures significantly increases the stability of perovskite solar cells. However, due their low electron mobility, aligning sheets ensure unimpeded charge transport is critical rival high performances pure 3D systems. While additives such as methylammonium chloride (MACl) can enable this preferential orientation, so far, no complete description exists explaining how they influence nucleation process grow highly aligned...
The development of ambient-air-processable organic–inorganic halide perovskite solar cells (OIHPSCs) is a challenge necessary for the transfer laboratory-scale technology to large-scale and low-cost manufacturing such devices. Different approaches like additives, antisolvents, composition engineering, different deposition techniques have been employed improve morphology films. Additives that can form Lewis acid–base adducts are known minimize extrinsic impacts trigger defects in ambient air....
Nanoscale investigations by scanning probe microscopy have provided major contributions to the rapid development of organic–inorganic halide perovskites (OIHP) as optoelectronic devices. Further improvement device level properties requires a deeper understanding performance-limiting mechanisms such ion migration, phase segregation, and their effects on charge extraction both at nano- macroscale. Here, we studied dynamic electrical response Cs0.05(FA0.83MA0.17)0.95PbI3–xBrx perovskite...
Abstract The noticeable growth in the power conversion efficiency of solution-processed organo-inorganic halide perovskite solar cells (OIHPSCs) incited photovoltaic community to look for limitations that hurdle commercialization process. surface and interface defects between electron transport layers are among main challenges cause significant non-radiative recombination losses, thereby they result poor performance stability. In this work, tetracyanoquinodimethane (TCNQ), a strong acceptor...
In this research, cobalt-doped Ni(OH)2 on a PANI-decorated NF substrate is prepared via an electrochemical method. The surface characteristics, roughness, chemical composition, and crystalline structure of the materials are described using scanning electron microscopy (SEM), atomic force (AFM), energy dispersive spectroscopy (EDS), X-ray photoelectron (XPS), diffraction (XRD), in that order. Further, optical characterization techniques attenuated total reflection Fourier transform infrared...
Nowadays, hydrogen fuel is becoming more popular, and it attracting significant attention as a sustainable environmentally benign energy source owing to its zero emission of harmful substances high density. Hydrogen generation through the electrocatalytic evolution reaction (HER) employs economically inexpensive self-supported electrocatalysts that hold immense potential provide cost-effective in future scenario. A NiO@TiO2 nanofiber composite on Ti-foil synthesized via hydrothermal...
A low temperature solution processed TiO<sub>x</sub>interlayer was used to improve the performance and stability of mixed-cation–mixed-halide perovskite solar cells.
Based on the knowledge that o-aminomethylphenylboronic acids reversibly bind to carbohydrates, relevant water-soluble derivatives of former were prepared by appending hydrophilic tethers. In this way phenylboronic acid used hydrolytically dissolve, i.e. depolymerize cellulose in water at nearly neutral pH values. Some these tethers consisted moieties surmised be able promote hydrolysis glycosidic bonds such as a carboxylic acid, phosphonic weak Bronsted acids, or an imidazole functionality...
In this contribution, we show CH3NH3PbI3–xClx perovskite solar cells (PSCs) processed in ambient air from a solution containing the diketone, acetylacetone (AA) solvent as an additive. PSCs with AA additive enhanced photovoltaic properties. The optimized PSC 10 vol % shows average open-circuit voltage (VOC) of about 1.02 V, short-circuit current density (Jsc) around 18.7 mA/cm2, fill factor 76%, and power conversion efficiency 14.5%. Atomic force microscopy topographic imaging depicts that...
Herein, the optoelectronic properties of interface‐engineered perovskite 2D|3D‐heterojunction structure solar cells are reported. The reciprocity theorem is applied to determine maximum open‐circuit voltage ( V oc ) device can deliver under illumination. A 1.295 found, analyzing measured external quantum efficiency and assuming only radiative recombination. For comparison, experimental found for studied 2D|3D heterojunctions 1.15 V. contribution nonradiative recombination explored by...
The operational stability of organic-inorganic halide perovskite based solar cells is a challenge for widespread commercial adoption. mobility ionic species key contributor to instability since ion migration can lead unfavourable changes in the crystal lattice and ultimately destabilisation phase. Here we study nanoscale early-stage degradation mixed-halide mixed-cation films under operation-like conditions using electrical scanning probe microscopy investigate formation surface nanograin...
Abstract The unprecedented increase in power conversion efficiency (PCE) of low‐cost organo‐inorganic halide perovskite solar cells (OIHPSCs) toward its Shockley‐Queisser limit intriguingly has prompted researchers to investigate the disadvantages these devices. issue operational stability is main hurdle challenging way forward for commercialization. To address this, various engineering processes like composition, additives, anti‐solvents, bulk and interface passivation, deposition...
Herein, the impact of thin layer polyphosphazene derivatives, as a buffer between electron‐transporting and back metal‐contact in mixed‐cation mixed‐halide perovskite solar cells (PSCs), is explored. PSCs with poly[bis(allylamino)phosphazene] (PPz) interlayer exhibit enhanced rectification photo‐induced current density–voltage ( J–V ) curves, which show improved photovoltaic performance photostability reduced hysteresis. The thickness optimized PPz shows an average open‐circuit voltage V OC...
Photon cooling <italic>via</italic> anti-Stokes photoluminescence (ASPL) is a promising approach to realize all-solid-state cryo-refrigeration by photoexcitation.
Perovskite Solar Cells In article 2208061, Lukas E. Lehner, Martin Kaltenbrunner, and co-workers report the controlled nucleation of quasi-2D perovskites at liquid–air interface precursor solution. Restricting initial crystal growth to surface liquid results in highly aligned perovskite thin films with improved charge transport, enabling efficient solar cells excellent stability.