A5015611582- Perovskite Materials and Applications
- Photonic Crystals and Applications
- Thin-Film Transistor Technologies
- Luminescence Properties of Advanced Materials
- Photonic and Optical Devices
- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Photochemistry and Electron Transfer Studies
- Silicon Nanostructures and Photoluminescence
- Optical Coatings and Gratings
- Solid State Laser Technologies
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Glass properties and applications
- Nanowire Synthesis and Applications
- Semiconductor materials and interfaces
- Photorefractive and Nonlinear Optics
- Photovoltaic System Optimization Techniques
- Ga2O3 and related materials
- Luminescence and Fluorescent Materials
- TiO2 Photocatalysis and Solar Cells
- Radiation Detection and Scintillator Technologies
- Organic Light-Emitting Diodes Research
Philipps University of Marburg
2022-2024
Fraunhofer Institute for Solar Energy Systems
2014-2023
Potsdam Institute for Climate Impact Research
2022
Instituto Superior Técnico
2017
Center for Innovation
2017
Fraunhofer Society
2008-2015
University of Victoria
2015
Imperial College London
2013-2014
RWTH Aachen University
2012
University of Freiburg
2009-2011
Improving costs and scale reflect looming opportunities
Upconversion (UC) of subband-gap photons is a promising possibility to enhance solar cell efficiency by making also the useful. For this application, we investigate material system trivalent erbium doped sodium yttrium fluoride (NaYF4:20%Er3+), which shows efficient UC suitable for silicon cells. We determine optical calibrated photoluminescence measurements. Because these data are free from any influence losses associated with application upconverter cell, obtained values constitute upper...
The efficiency of photovoltaic energy conversion is a decisive factor for low-cost electricity from renewable energies. In recent years, the crystalline silicon solar cells in mass production has increased annually by about 0.5–0.6%abs per year. order to maintain this development speed, new technologies must be developed and transferred industrial production. After transition full area Al back surface field passivated emitter rear contact cells, passivating contacts are an important step get...
25% annual PV growth is possible over the next decade.
While perovskite-based photovoltaics is progressing toward commercialization, it remains an open question which fabrication technology – solution-based, vapor-based, or combinations will pave the way to faster economic breakthrough.
Upconversion (UC) is a promising option to enhance the efficiency of solar cells by conversion sub-bandgap infrared photons higher energy that can be utilized cell. The UC quantum yield key parameter for successful application. Here luminescence properties Er3+-doped Gd2O2S are investigated means spectroscopy, measurements, and excited state dynamics experiments. Excitation into maximum 4I15/2 → 4I13/2 Er3+ absorption band around 1500 nm induces very efficient emission from different states...
Monolithic perovskite silicon tandem solar cells can overcome the theoretical efficiency limit of cells. This requires an optimum bandgap, high quantum efficiency, and stability perovskite. Herein, a heterojunction bottom cell is combined with top cell, bandgap 1.68 eV in planar p–i–n configuration. A methylammonium‐free FA 0.75 Cs 0.25 Pb(I 0.8 Br 0.2 ) 3 content investigated for improved stability. 10% molarity increase to 1.1 m precursor solution results ≈75 nm thicker absorber layers 0.7...
Approaching efficiency limits for silicon photovoltaics and impressive gains new perovskite tandem solar cells trigger the question, which technology will be most economically attractive option in future. With a bottom-up approach we estimate manufacturing costs of modules based on silicon, single junction, cells. We determine levelized cost electricity (LCOE) current costs, because is not readily available yet, project as well future LCOE considering ongoing dynamic system reductions....
Perovskite silicon tandem solar cells have the potential to overcome efficiency limit of single-junction cells. For both monolithic and mechanically stacked devices, a semi-transparent perovskite top cell, including transparent contact, is required. Usually, this contact consists metal oxide buffer layer sputtered conductive oxide. In work, in regular n-i-p structure are presented with tin-doped indium (ITO) directly on hole conducting material Spiro-OMeTAD. ITO process parameters such as...
Abstract Perovskite–silicon tandem solar cells have shown a rapid progress within the past 5 years in terms of their research cell efficiency and are currently being investigated as candidates for next generation industrial PV devices. This raises question which silicon bottom will be most suitable application. Currently, heterojunction (SHJ) technology dominates achieving world records. However, it is an open issue how to transfer these results mass production, driven by cost reduction...
Abstract Perovskite silicon tandem solar cells are a promising technology to overcome the efficiency limit of cells. Although highest efficiencies have been reported for inverted p‐i‐n structure, high‐efficiency single junction perovskite mostly fabricated in regular n‐i‐p architecture. In this work, with high‐bandgap mixed cation halide absorber suitable investigated by compositional engineering and open‐circuit voltage is improved over 1.12 V using passivating electron contact. The...
Terawatt-scale photovoltaics necessary for cost-efficient climate change mitigation, is associated with massive resource consumptions. Continued technological learning enables large-scale deployment without hitting hard constraints.
Perovskite silicon tandem solar cells can overcome the efficiency limit of single‐junction cells. In two‐terminal perovskite cells, current matching subcells is an important requirement. Herein, a current‐matched cell using planar front/ rear side‐textured heterojunction bottom with p–i–n top that yields high certified short‐circuit density 19.6 mA cm −2 reported. Measures taken to improve device are guided by optical simulation and derived roadmap toward maximized density. To realize two...
Photovoltaics (PV) and wind are the most important energy-conversion technologies for cost-efficient climate change mitigation. To reach international goals, annual PV module production must be expanded to multi-terawatt (TW) scale. Economic resource restraints demand implementation of multi-junction technologies, which perovskite-based tandem highly promising. In this work, emerging perovskite technology is investigated, considering two factors supply criticality, namely, mining capacity...
Abstract A spectral beam‐splitting architecture is shown to provide an excellent basis for a four junction photovoltaic receiver with virtually ideal band gap combination. Spectrally selective beam‐splitters are used create very efficient light trap in form of 45° parallelepiped. The distributes incident radiation onto the different solar cells optical efficiency more then 90%. Highly including III–V semiconductors and silicon were fabricated mounted into trapping assembly. An integrated...
The upconversion of infrared photons is a promising possibility to enhance solar cell efficiency by producing electricity from otherwise unused sub-band-gap photons. We present rate equation model and the relevant processes in order describe near-infrared considers stimulated spontaneous processes, multi-phonon relaxation, energy transfer between neighboring ions. input parameters for are experimentally determined material system, β-NaEr0.2Y0.8F4. determination transition probabilities, also...
The integration of solar cells with supercapacitors into hybrid monolithic power packs can provide energy autonomy to smart electronic devices the Internet Things (IoT) by mediating between intermittent load and supply. Herein, such a photorechargeable supercapacitor (also called photosupercapacitor) is developed via three‐electrode p–i–n halide perovskite cell gel electrolyte‐type that uses mesoporous N‐doped carbon nanospheres (MPNC) as active electrode material. Benefiting from large...