A5077044863- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Chalcogenide Semiconductor Thin Films
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Molecular Junctions and Nanostructures
- Semiconductor materials and interfaces
- Fullerene Chemistry and Applications
- Advanced Photocatalysis Techniques
- Silicon and Solar Cell Technologies
- Crystallography and molecular interactions
- Covalent Organic Framework Applications
- Porphyrin and Phthalocyanine Chemistry
- Photochemistry and Electron Transfer Studies
- Advanced Memory and Neural Computing
- Analytical Chemistry and Sensors
- Solid-state spectroscopy and crystallography
- 2D Materials and Applications
- TiO2 Photocatalysis and Solar Cells
- Metal-Organic Frameworks: Synthesis and Applications
King Abdullah University of Science and Technology
2016-2025
Ludwig-Maximilians-Universität München
2024-2025
LMU Klinikum
2024-2025
Technical University of Munich
2024
CEA Paris-Saclay
2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2024
Robert Bosch (Germany)
2023
Central South University
2022
Friedrich Schiller University Jena
2022
Chinese University of Hong Kong
2022
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...
The application of liquid-exfoliated 2D transition metal disulfides (TMDs) as the hole transport layers (HTLs) in nonfullerene-based organic solar cells is reported. It shown that solution processing few-layer WS2 or MoS2 suspensions directly onto transparent indium tin oxide (ITO) electrodes changes their work function without need for any further treatment. HTLs comprising are found to exhibit higher uniformity on ITO than those and consistently yield with superior power conversion...
Abstract The performance of state‐of‐the‐art perovskite solar cells is currently limited by defect‐induced recombination at interfaces between the and electron hole transport layers. These defects, most likely undercoordinated Pb halide ions, must either be removed or passivated if cell efficiencies are to approach their theoretical limit. In this work, a universal double‐side polymer passivation introduced using ultrathin poly(methyl methacrylate) (PMMA) films. Very high‐efficiency (≈20.8%)...
We explore the photophysics of P(NDI2OD-T2), a high-mobility and air-stable n-type donor/acceptor polymer. Detailed steady-state UV-vis photoluminescence (PL) measurements on solutions P(NDI2OD-T2) reveal distinct signatures aggregation. By performing quantum chemical calculations, we can assign these spectral features to unaggregated stacked polymer chains. NMR independently confirm aggregation phenomena in solution. The detailed analysis optical spectra shows that is two-step process with...
Despite significant study, the precise mechanisms that dictate efficiency of organic photovoltaic cells, such as charge separation and recombination, are still debated. Here, we directly observe efficient ultrafast free generation in absence field annealed poly(3-hexylthiophene):methanofullerene (P3HT:PCBM). However, find this process is much less unannealed amorphous regiorandom blends, explaining superior short-circuit current fill-factor RR-P3HT:PCBM solar cells. We use transient optical...
Abstract The short exciton diffusion length associated with most classical organic semiconductors used in photovoltaics (5-20 nm) imposes severe limits on the maximum size of donor and acceptor domains within photoactive layer cell. Identifying materials that are able to transport excitons over longer distances can help advancing our understanding lead solar cells higher efficiency. Here, we measure a wide range nonfullerene molecules using two different experimental techniques based...
Heavy atom-free BODIPY-anthracene dyads (BADs) generate locally excited triplet states by way of photoinduced electron transfer (PeT), followed recombination the resulting charge-separated (CSS). Subsequent quenching molecular oxygen produces singlet (1O2), which reacts with anthracene moiety yielding highly fluorescent species. The steric demand alkyl substituents in BODIPY subunit defines site 1O2 addition. Novel bis- and tetraepoxides bicyclic acetal products, arising from rearrangements...
The precise mechanism and dynamics of charge generation recombination in bulk heterojunction polymer:fullerene blend films typically used organic photovoltaic devices have been intensively studied by many research groups, but nonetheless remain debated. In particular the role interfacial charge-transfer (CT) states free carriers, an important step for understanding device function, is still under active discussion. this article we present direct optical probes exciton pristine a prototypic...
The performance of perovskite solar cells with inverted polarity (p-i-n) is still limited by recombination at their electron extraction interface, which also lowers the power conversion efficiency (PCE) p-i-n perovskite-silicon tandem cells. A MgF x interlayer thickness ~1 nanometer perovskite/C 60 interface favorably adjusts surface energy layer through thermal evaporation, facilitates efficient and displaces C from to mitigate nonradiative recombination. These effects enable a champion...
Better than sliced bread: Layered two-dimensional graphene-based conjugated microporous polymers, which exhibit high surface areas and fluorescence quenching, can be prepared by a graphene-mediated Sonogashira–Hagihara coupling. Upon thermal pyrolysis, these porous polymers are readily converted into carbon materials with intriguing physical electrochemical properties (see scheme; pink spheres=thiophene, thiazole, or pyridine units).
Dimensionality for conjugated micro-porous polymers (CMP-nD, n = 0, 1, 2) is proven to be of great importance tailoring their photophysical properties. Moreover, CMP-nD can further converted into boron and nitrogen co-doped porous carbons (nDBN, with maintained 0D, 1D, 2D nano-structures highly efficient catalytic performance.
Molecular doping is often used in organic semiconductors to tune their (opto)electronic properties. Despite its versatility, however, application photovoltaics (OPVs) remains limited and restricted p-type dopants. In an effort control the charge transport within bulk-heterojunction (BHJ) of OPVs, n-type dopant benzyl viologen (BV) incorporated a BHJ composed donor polymer PM6 small-molecule acceptor IT-4F. The power conversion efficiency (PCE) cells found increase from 13.2% 14.4% upon...
Abstract Self‐assembled monolayers (SAMs) based on Br‐2PACz ([2‐(3,6‐dibromo‐9 H ‐carbazol‐9‐yl)ethyl]phosphonic acid) 2PACz ([2‐(9H‐Carbazol‐9‐yl)ethyl]phosphonic and MeO‐2PACz ([2‐(3,6‐dimethoxy‐9H‐carbazol‐9‐yl)ethyl]phosphonic molecules were investigated as hole‐extracting interlayers in organic photovoltaics (OPVs). The highest occupied molecular orbital (HOMO) energies of these SAMs measured at −6.01 −5.30 eV for MeO‐2PACz, respectively, found to induce significant changes the work...
The reported power conversion efficiencies (PCEs) of nonfullerene acceptor (NFA) based organic photovoltaics (OPVs) now exceed 14% and 17% for single-junction two-terminal tandem cells, respectively. However, increasing the PCE further requires an improved understanding factors limiting device efficiency. Here, efficiency limits NFA-based OPV cells are examined with aid a numerical simulator that takes into account optical properties active material(s), charge recombination effects, hole...
The frontier molecular energy levels of organic semiconductors are decisive for their fundamental function and efficiency in optoelectronics. However, the precise determination these variation when using different techniques makes it hard to compare establish design rules. In this work, 33 via cyclic voltammetry (CV), density functional theory, ultraviolet photoelectron spectroscopy, low-energy inverse spectroscopy determined. Solar cells fabricated obtain key device parameters relate them...
27%-efficient perovskite/silicon tandem solar cells are achieved in n–i–p configuration by developing novel electron and hole selective contacts, which combine high broadband transparency with efficient charge extraction.
Abstract Recent achievements in amorphous/crystalline silicon heterojunction (SHJ) solar cells and perovskite/SHJ tandem place hydrogenated amorphous (a-Si:H) at the forefront of photovoltaics. Due to extremely low effective doping efficiency trivalent boron tetravalent silicon, light harvesting aforementioned devices is limited by their fill factors (FFs), a direct metric charge carrier transport. It challenging but crucial develop highly conductive doped a-Si:H with minimal FF losses. Here...