A5002055917- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- Organic Light-Emitting Diodes Research
- Silicon and Solar Cell Technologies
- Quantum Dots Synthesis And Properties
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
- Photosynthetic Processes and Mechanisms
- Mitochondrial Function and Pathology
- Green IT and Sustainability
- ATP Synthase and ATPases Research
- Nanowire Synthesis and Applications
- DNA Repair Mechanisms
- Amino Acid Enzymes and Metabolism
- Bacterial Genetics and Biotechnology
- Mechanical and Optical Resonators
- solar cell performance optimization
- bioluminescence and chemiluminescence research
- Advanced MEMS and NEMS Technologies
- Advancements in Solid Oxide Fuel Cells
- Advanced battery technologies research
- Photochromic and Fluorescence Chemistry
- CRISPR and Genetic Engineering
Fraunhofer Institute for Solar Energy Systems
2016-2025
University of Freiburg
2014-2024
Materials Research Center
2019
University of Bayreuth
2016
University of Konstanz
2016
Institut de Chimie
2008
Centre National de la Recherche Scientifique
2008
Intel (United States)
2007
Chemical environment and precursor-coordinating molecular interactions within a perovskite precursor solution can lead to important implications in structural defects crystallization kinetics of film. Thus, the opto-electronic quality such films be boosted by carefully fine-tuning coordination chemistry precursors
Lead halide perovskite solar cells have shown a tremendous rise in power conversion efficiency with reported record efficiencies of over 20% making this material very promising as low cost alternative to conventional inorganic cells. However, due differently severe “hysteretic” behaviour during current density-voltage measurements, which strongly depends on scan rate, device and measurement history, preparation method, architecture, etc., commonly used cell measurements do not give reliable...
While perovskite photovoltaic (PV) devices are on the verge of commercialization, promising methods to recycle or remanufacture fully encapsulated solar cells (PSCs) and modules still missing. Through a detailed life-cycle assessment shown in this work, we identify that majority greenhouse gas emissions can be reduced by re-using glass substrate parts PV cells. Based these analytical findings, develop novel thermally assisted mechanochemical approach remove encapsulants, electrode, absorber,...
Although halide perovskite solar cell (PSC) technology reaches, in few years, efficiencies greater than 25%, the cost‐ceffective perspective is achievable only if scalable processes real manufacturing conditions (i.e., pilot line and/or plant factory) are designed and optimized for full device stack. Herein, a semiautomatic process based on blade‐coating technique demonstrated to fabricate modules ambient conditions. An efficient stable triple‐cation cesium methylammonium formamidinium...
Abstract Metal halide perovskites have raised huge excitement in the field of emerging photovoltaic technologies. The possibility fabricating perovskite solar cells (PSCs) on lightweight, flexible substrates, with facile processing methods, provides very attractive commercial possibilities. Nevertheless, efficiency values for devices reported literature typically fall short comparison to rigid, glass‐based architectures. Here, a solution‐processable fullerene derivative, [6,6]‐phenyl‐C61...
A sacrificial film of polystyrene nanoparticles was utilized to introduce nano-cavities into mesoporous metal oxide layers. This enabled the growth larger perovskite crystals inside scaffold with significantly suppressed non-radiative recombination and improved device performance. work exemplifies potential applications such nanoarchitectonic approaches in opto-electronic devices.
All‐perovskite tandem solar cells are emerging at a fast rate because of their potential to exceed efficiencies Si‐perovskite tandems, in combination with faster manufacturing, lower cost and the ability be processed on flexible substrates. Mixing halides is key achieve wide band gap absorbers, which however suffer from halide segregation under illumination resulting lowering gap. To tackle this problem, butylamine (BA) has been added perovskite precursor solution was found react...
Simple organic molecules with permanent dipole moments – amino acids and heterocycles have been successfully employed in bulk‐heterojunction solar cells as interlayer between photoactive material electron contact. A large increase of open‐circuit voltage fill factor can be observed for four different polymers donor the layer. combination current–voltage curves, scanning Kelvin‐probe atomic force microscopy, ultraviolet photoelectron spectroscopy, electroluminescence measurements well...
Abstract Time‐resolved electron paramagnetic resonance (TREPR) spectroscopy is shown to be a powerful tool characterize triplet excitons of conjugated polymers. The resulting spectra are highly sensitive the orientation molecule. In thin films cast on PET film, molecules’ with respect surface plane can determined, providing access sample morphology microscopic scale. Surprisingly, polymer investigated here, promising material for organic photovoltaics, exhibits ordering even in bulk samples....
In the last years, novel materials for formation of electron-selective contacts on n-type crystalline silicon (c-Si) heterojunction solar cells were explored as an interfacial layer between metal electrode and c-Si wafer. Besides inorganic like transition oxides or alkali fluorides, also layers based organic molecules with a permanent dipole moment are promising candidates to improve contact properties. Here, effect plays essential role in modification interface effective work function...
Light soaking under “1 sun” is performed on planar p–i–n perovskite solar cells with a Cs 0.05 MA 0.10 FA 0.85 Pb(I 0.95 Br ) 3 absorber while measuring current and voltage transients simultaneously to spectral photoluminescence (PL). From theory tenfold increase in PL intensity expected for every 60 mV rise V OC (at 300 K). However, the investigated show reversible from as low 0.5 up 1.05 during light soaking, whereas hardly changes. A model developed based mobile ions combination nonideal...
Herein, a strong short‐circuit current density ( J SC ) loss is observed when using phenetylammonium iodide (PEAI) as n‐side passivation in p–i–n perovskite solar cells. Comparing experiments with drift–diffusion simulations, different hypotheses for the origin of are presented and evaluated. Whereas optical properties investigated cell stack remain unchanged, internal quantum efficiency PEAI‐based devices decreases drastically. Strong bulk doping interface traps ruled out charge extraction...
Silicon-based tandem solar cells can overcome the efficiency limit of single junction silicon cells. Perovskite are particularly promising as a top cell in monolithic devices due to their rapid development towards high efficiencies, tunable band gap with sharp optical absorption edge and simple production process. In devices, perovskite is deposited directly on cell, requiring low-temperature processes (< 200°C) maintain functionality under-lying layers case highly efficient hetero-junction...
Solar cells based on hybrid organic/inorganic perovskites have shown an astonishing efficiency development in the past years, having peaked power conversion efficiencies of >25% for small‐area single‐junction devices. To pave way future commercialization, however, high also to be demonstrated areas multiple orders magnitude larger. Herein, methylammonium‐free perovskite photovoltaic modules with active area 66 cm 2 are presented. All functional layers processable from solution deposited...
Piezoelectric accelerometers based on aluminum nitride thin films offer a number of advantages in microelectromechanical systems such as high signal-to-noise ratio, low dielectric loss, power requirements and CMOS process compatibility. This paper reports the state-of-the-art piezoelectric accelerometer design with an emphasis maximizing sensitivity per area. The have novel sensing structure to increase without increasing area using approach stress concentrations. Furthermore, is designed...
The proton-pumping NADH:ubiquinone oxidoreductase (complex I) is the first enzyme complex of respiratory chains in many bacteria and most eukaryotes. It least understood all, due to its enormous size unique energy conversion mechanism. bacterial general made up 14 different subunits named NuoA−N. Subunits NuoE, -F, -G comprise electron input part complex. We have cloned these genes from hyperthermophilic bacterium Aquifex aeolicus expressed them heterologously Escherichia coli. A soluble...
In order to systematically improve perovskite-based solar cell technologies, it is crucial identify performance limits and determine both global local loss mechanisms quantitatively. One of the most important steps toward competitiveness upscaling perovskite cells, which can be achieved, e.g., via solution-based blade coating processes. Cells with an active area 1.1 cm2 efficiencies approaching 12% are presented a comprehensive analysis based on spatially resolved measurements including...
Several bottlenecks need to be passed reach market readiness for organic photovoltaic modules. To avoid scarce and costly materials such as indium is an important technological issue. able process the active layer from solutions prepared non‐halogenated solvents harmless additives also a crucial step. Herein, fluorinated polymer used electron‐donor material PC 71 BM electron‐accepting in bulk‐heterojunction configuration, demonstrate that indium‐tin‐oxide (ITO)‐free modules with area greater...
The energy-converting NADH:ubiquinone oxidoreductase, also known as respiratory complex I, couples the transfer of electrons from NADH to ubiquinone with translocation protons across membrane. Electron microscopy revealed two-part structure consisting a peripheral and membrane arm. arm contains all cofactors NADH-binding site, whereas has be involved in proton translocation. Owing this, conformation-linked mechanism for redox-driven is discussed. By means electron microscopy, we show that...
This paper presents an alternative approach to obtain, from experimental measurements, physical parameters of organic solar cells associated with a given model. In order get rid the limitations common fitting methods, we use specific Markov chain Monte Carlo technique. method is applied two-dimensional model cell. Measurements carried out under dark and one sun conditions, two complementary cells, allow access more reliable values active layer parameters. The corresponding set generates JV...
Among various coating techniques, blade is one promising alternative for upscaling perovskite photovoltaic devices from small area research cells to intermediately sized and modules. Also, it potentially compatible future roll‐to‐roll processing. In this work, planar inverted (p‐i‐n) solution‐processed solar are presented, with absorber layers deposited via in a one‐step process, employing lead(II) acetate trihydrate as lead source. It found that control of the layer drying before annealing...