A5002468615- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Silicon and Solar Cell Technologies
- solar cell performance optimization
- Photovoltaic System Optimization Techniques
- Organic Light-Emitting Diodes Research
- Fullerene Chemistry and Applications
- Molecular Junctions and Nanostructures
- Nanowire Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Solid-state spectroscopy and crystallography
- Semiconductor materials and interfaces
- Nanomaterials and Printing Technologies
- Machine Learning in Materials Science
- Photovoltaic Systems and Sustainability
- Photochemistry and Electron Transfer Studies
- Solar Radiation and Photovoltaics
- Industrial Vision Systems and Defect Detection
- Luminescence and Fluorescent Materials
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor and Energy Harvesting Materials
Friedrich-Alexander-Universität Erlangen-Nürnberg
2016-2025
Helmholtz Institute Erlangen-Nürnberg
2019-2025
Forschungszentrum Jülich
2019-2025
University of Groningen
2000-2024
Schiller International University
2014-2024
Bavarian Center for Applied Energy Research
2014-2023
Centre for Materials for Electronics Technology
2014-2023
Griffith University
2023
Tokyo University of Science
2023
Nanyang Technological University
2023
For bulk-heterojunction photovoltaic cells fabricated from conjugated polymers and a fullerene derivative, the relation between open-circuit voltage (Voc) oxidation potential for different is studied. A linear Voc found (see figure). Based on this relation, energy-conversion efficiency of solar cell derived as function bandgap energy levels polymer.
Recent developments in conjugated-polymer-based photovoltaic elements are reviewed. The photophysics of such photoactive devices is based on the photo-induced charge transfer from donor-type semiconducting conjugated polymers to acceptor-type or acceptor molecules as Buckminsterfullerene, C60. This reversible, ultrafast (within 100 fs) with a quantum efficiency approaching unity, and charge-separated state metastable (up milliseconds at 80 K). Being similar first steps natural...
Abstract Solution‐processed bulk‐heterojunction solar cells have gained serious attention during the last few years and are becoming established as one of future photovoltaic technologies for low‐cost power production. This article reviews highlights years, summarizes today's state‐of‐the‐art performance. An outlook is given on relevant materials that potential to guide this young technology towards magic 10% regime. A cost model supplements technical discussions, with practical aspects any...
We show that the power conversion efficiency of organic photovoltaic devices based on a conjugated polymer/methanofullerene blend is dramatically affected by molecular morphology. By structuring to be more intimate mixture contains less phase segregation methanofullerenes, and simultaneously increasing degree interactions between polymer chains, we have fabricated device with 2.5% under AM1.5 illumination. This nearly threefold enhancement over previously reported values for such device, it...
A series of highly soluble fullerene derivatives with varying acceptor strengths (i.e., first reduction potentials) was synthesized and used as electron acceptors in plastic solar cells. These derivatives, methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM), a new azafulleroid, ketolactam quasifullerene, show variation almost 200 mV their potential. The open circuit voltage the corresponding devices found to correlate directly strength fullerenes, whereas it rather insensitive...
Two criteria for processing additives introduced to control the morphology of bulk heterojunction (BHJ) materials use in solar cells have been identified: (i) selective (differential) solubility fullerene component and (ii) higher boiling point than host solvent. Using these criteria, we investigated class 1,8-di(R)octanes with various functional groups (R) as BHJ cells. Control by is demonstrated using high additives. The best results are obtained R = Iodine (I). 1,8-diiodooctane additive,...
Abstract Improving the long-term stability of perovskite solar cells is critical to deployment this technology. Despite great emphasis laid on stability-related investigations, publications lack consistency in experimental procedures and parameters reported. It therefore challenging reproduce compare results thereby develop a deep understanding degradation mechanisms. Here, we report consensus between researchers field for testing cell stability, which are based International Summit Organic...
Abstract Solution-processed organic photovoltaics (OPV) offer the attractive prospect of low-cost, light-weight and environmentally benign solar energy production. The highest efficiency OPV at present use low-bandgap donor polymers, many which suffer from problems with stability synthetic scalability. They also rely on fullerene-based acceptors, themselves have issues cost, limited spectral absorption. Here we a new non-fullerene acceptor that has been specifically designed to give improved...
Bulk heterojunction polymer solar cells made from a novel low-bandgap show the highest photocurrent response so far for this class of materials (see figure). Efficiencies up to 3.2 % are realized, but conjugated has intrinsic capability reach 7 efficiency because its material properties. Possible loss mechanisms and improvements discussed.
The monochromatic external quantum efficiency of a bulk heterojunction photodetector based on blend poly-3(hexylthiophene) with methanofullerene is reported to be as high 76% at the peak maximum 25 °C. Analysis temperature dependence, illumination intensity dependence together absorption measurements in reflection geometry, allow calculation internal device close 100% maximum. Recombination photoinduced carriers negligible or even absent these photodetectors when operated photovoltaic mode....
The insertion of thin interlayers LiF under the negative metal electrode (Al and Au) bulk heterojunction solar cells significantly enhances fill factor stabilizes high open circuit voltages. Compared to devices without interfacial layer, white light efficiencies increase by over 20% up ηeff∼3.3%. Substitution another insulating interlayer SiOx results in lower overall efficiencies. In case a LiF/Au electrode, substantial efficiency enhancement is observed compared pristine Au ηeff∼2.3% are reported.
We investigate thin poly(3-hexylthiophene-2,5-diyl)/[6,6]-phenyl C61 butyric acid methyl ester (P3HT/PCBM) films, which are widely used as active layers in plastic solar cells. Their structural properties studied by grazing-incidence X-ray diffraction (XRD). The size and the orientation of crystalline P3HT nanodomains within films determined. PCBM crystallites not detected XRD. Upon annealing, crystallinity increases, leading to an increase optical absorption spectral photocurrent...
The progress in the development and understanding of interfacial materials for organic photovoltaics (OPV) is reviewed. proper choice interface a must highly efficient stable OPV devices has become significant part research today. Interface are either non-conducting, semiconducting or conducting layers which not only provide selective contacts carriers one sort, but can also determine polarity devices, affect open-circuit voltage, act as optical spacers protective layers. In this review both...
The challenge to reversing the layer sequence of organic photovoltaics (OPVs) is prepare a selective contact bottom cathode and achieve suitable morphology for carrier collection in inverted structure. authors report creation an efficient electron based on solution-processed titanium oxide interfacial top indium tin oxide. use o-xylene as solvent creates network with little vertical phase segregation, providing sufficient performance both regular solar cells. demonstrate OPVs AM 1.5...
A major bottleneck delaying the further commercialization of thin-film solar cells based on hybrid organohalide lead perovskites is interface loss in state-of-the-art devices. We present a generic architecture that combines solution-processed, reliable, and cost-efficient hole-transporting materials without compromising efficiency, stability, or scalability perovskite cells. Tantalum-doped tungsten oxide (Ta-WO x )/conjugated polymer multilayers offer surprisingly small barrier form...