A5030101773- Thin-Film Transistor Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Nanowire Synthesis and Applications
- Hybrid Renewable Energy Systems
- Silicon Nanostructures and Photoluminescence
- Plasmonic and Surface Plasmon Research
- Perovskite Materials and Applications
- Near-Field Optical Microscopy
- Chalcogenide Semiconductor Thin Films
- Silicon and Solar Cell Technologies
- Advanced Photocatalysis Techniques
- Energy, Environment, and Transportation Policies
- Optical Coatings and Gratings
- Environmental Impact and Sustainability
- Energy and Environment Impacts
- Ga2O3 and related materials
- Electrocatalysts for Energy Conversion
- Global Energy and Sustainability Research
- Solar Thermal and Photovoltaic Systems
- Electrowetting and Microfluidic Technologies
- Photonic and Optical Devices
- Advanced battery technologies research
- Climate Change Policy and Economics
- solar cell performance optimization
University of Basel
2024
Australian National University
2011-2024
University Children’s Hospital Basel
2024
Potsdam Institute for Climate Impact Research
2022
SINTEF
2022
Canberra (United Kingdom)
2016-2017
IP Australia
2016
Institute of Photonic Sciences
2011-2014
University of Konstanz
2014
University of Glasgow
2006-2007
Effective light management is imperative in maintaining high efficiencies as photovoltaic devices become thinner. We demonstrate a simple and effective method of enhancing trapping solar cells with thin absorber layers by tuning localized surface plasmons arrays Ag nanoparticles. By redshifting the plasmon resonances up to 200 nm, through modification local dielectric environment particles, we can increase optical absorption an underlying Si wafer fivefold at wavelength 1100 nm enhance...
A variety of unexpected characterization results exhibited by perovskite solar cells are linked to the presence mobile ions in active layer, as demonstrated detailed numerical device models.
We present criteria for optimizing the light-trapping efficiency of periodic arrays metal nanoparticles Si solar cell applications. The scattering cross section and diffraction grating should be maximized in long wavelength range. pitch chosen to allow higher order modes wavelengths while maintaining highest possible fill factor. These conditions place strong constraints on optimal parameters (particle size ∼200 nm ∼400 nm) nanoparticles, contrast dielectric gratings, where a relatively wide...
We show experimentally that there is asymmetry in photocurrent enhancement by Ag nanoparticle arrays located on the front or rear of solar cells. The scattering cross-section calculated for front- and rear-located nanoparticles can differ up to a factor 3.7, but coupling efficiency remains same. attribute this differences electric field strength normalized front-located varies from two eight depending intensity driving field. In addition, particles be increased fourfold using ultrathin spacer layers.
Significant photocurrent enhancement has been achieved for evaporated solid-phase-crystallized polycrystalline silicon thin-film solar cells on glass, due to light trapping provided by Ag nanoparticles located the rear surface of cells. This configuration takes advantage high scattering cross-section and coupling efficiency rear-located particles formed directly optically dense layer. We report short-circuit current 29% nanoparticles, increasing 38% when combined with a detached back...
The excitation of surface plasmons on metallic nanoparticles has the potential to significantly improve performance solar cells, in particular thin-film structures. In this article, we investigate effect dielectric spacer layer thickness photocurrent enhancement 2 μm thick, poly-Si glass due random arrays self-assembled Ag deposited front or rear cells. We report a strong asymmetry external quantum efficiency (EQE) cell for and located particles different thicknesses, which is attributed...
Abstract Realizing solar‐to‐hydrogen (STH) efficiencies close to 20% using low‐cost semiconductors remains a major step toward accomplishing the practical viability of photoelectrochemical (PEC) hydrogen generation technologies. Dual‐absorber tandem cells combining inexpensive are promising strategy achieve high STH at reasonable cost. Here, perovskite photovoltaic biased silicon (Si) photoelectrode is demonstrated for highly efficient stand‐alone solar water splitting. A p + nn ‐Si/Ti/Pt...
Direct synthesis of Ni 3 N/Ni catalyst enriched with N-vacancies using one-step reactive magnetron sputtering enhanced performance for the hydrogen evolution reaction in photoelectrochemical cells and electrolysers.
Abstract While direct solar‐driven water splitting has been investigated as an important technology for low‐cost hydrogen production, the systems demonstrated so far either required expensive materials or presented low solar‐to‐hydrogen (STH) conversion efficiencies, both of which increase levelized cost (LCOH). Here, a material system is demonstrated, consisting perovskite/Si tandem semiconductors and Ni‐based earth‐abundant catalysts solar generation. NiMo‐based evolution reaction catalyst...
Abstract We present experimental results for photocurrent enhancements in thin c‐Si solar cells due to light‐trapping by self‐assembled, random Ag nanoparticle arrays. The geometry is chosen maximise the enhancement provided employing previously reported design considerations plasmonic light‐trapping. particles are located on rear of cells, decoupling and anti‐reflection effects, scattering resonances red‐shifted target spectral regions which poorly absorbed Si, over‐coating with TiO 2 ....
Perovskite solar cells are notorious for exhibiting transient behavior not seen in conventional inorganic semiconductor devices. Significant inroads have been made into understanding this fact terms of rapid ion migration, now a well-established property the prototype photovoltaic perovskite MAPbI3 and strongly implicated newer mixed compositions. Here, we study manifestations migration frequency-domain small-signal measurements, focusing on popular technique Electrical Impedance...
This work provides a robust technoeconomic analysis of range direct solar hydrogen generation (DSHG) systems to understand the opportunities and challenges deploying DSHG reduce cost renewable production.
This study investigates the impact of including (or neglecting) variable efficiency hydrogen electrolyzers as a function operating power in modelling green produced from renewable energy sources. Results show that neglecting electrolyzer efficiency, is commonly done studies hydrogen, leads to significant overestimation production range 5–24%. The effects time resolution used models are also investigated, well option for switch stand-by mode instead powering down and ramp rate constraints....
Disk-shaped metal nanoparticles on high-index substrates can support resonant surface plasmon polariton (SPP) modes at the interface between particle and substrate. We demonstrate that this new conceptual model of nanoparticle scattering allows clear predictive abilities, beyond dipole model. As would be expected from nature mode, SPP resonance is very sensitive to area in contact with substrate, insensitive height. employ understanding minimise mode out-coupling Ohmic losses particles....
We investigate the influence of nanoparticle height on light trapping in thin-film solar cells covered with metal nanoparticles. show that taller nanoparticles scattering cross-section is enhanced by resonant excitation plasmonic standing waves. Tall have higher coupling efficiency when placed illuminated surface cell than rear due to their forward nature. One major factors affecting these particles phase shift plasmon polaritons propagating along reflection from Ag/Si or Ag/air interface....
We provide a new physical interpretation of scattering from plasmonic nanoparticles on high-index substrates. demonstrate the excitation different types resonant modes disk-shaped, Ag nanoparticles. At short wavelengths, resonances are localised at top particle, while longer wavelengths they Ag/substrate interface. attribute long wavelength to geometric surface plasmon polaritons (SPPs) show that particles support SPP have enhanced cross-sections when placed directly substrate; up 7.5 times...
We report broadband responsivity enhancement in PbS colloidal quantum dot (CQDs) photoconductive photodetectors due to absorption increase offered by a plasmonic scattering layer of Ag metal nanoparticles. Responsivity enhancements are observed the near infrared with maximum 2.4-fold band edge ∼1 μm for ∼400 nm thick devices. Additionally, we study effect mode structure on efficiency light trapping provided random nanoparticle CQD films and provide insights thin films.