A5102020962- Photochemistry and Electron Transfer Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Plasmonic and Surface Plasmon Research
- Organic Light-Emitting Diodes Research
- Optical Coatings and Gratings
- solar cell performance optimization
- Lanthanide and Transition Metal Complexes
- Molecular Sensors and Ion Detection
- Chalcogenide Semiconductor Thin Films
- Luminescence and Fluorescent Materials
- TiO2 Photocatalysis and Solar Cells
- Analytical Chemistry and Sensors
- Thin-Film Transistor Technologies
- Silicon Nanostructures and Photoluminescence
- Semiconductor Quantum Structures and Devices
- Photonic Crystals and Applications
- Glass properties and applications
- Ion-surface interactions and analysis
- Advanced Optical Imaging Technologies
- MXene and MAX Phase Materials
- Hydrogels: synthesis, properties, applications
- Soil and Land Suitability Analysis
- Materials Engineering and Processing
- Photopolymerization techniques and applications
Komar University of Science and Technology
2024
Al-Azhar University
2022-2024
Trinity College Dublin
2016-2021
University of Cambridge
1997
Core-shell quantum dots CdSe/ZnS and lumogen yellow organic dye are characterized by their inclusion in luminescent downshifting (LDS) layers. Layers were deposited on top of crystalline silicon cell (c-Si), synthesized solar (DSSC), cadmium telluride (CdTe) minimodules. External efficiency measurements for the cell/LDS devices discussed. Experimental results compared with an optical model developed Rothemund, 2014.
In this paper, core-shell semiconductor quantum dots (QDs) CdSeS/ZnS with emission at 490 nm and 450 were investigated for their use in luminescent down-shifting (LDS) layers. Luminescent yield (LQY) of the QDs measurements solution proposed that they suitable candidates inclusion LDS encapsulated poly(methyl,methacrylate) (PMMA) polymer matrix films fabricated <TEX>$134{\pm}0.05$</TEX> microns. Selections organic dyes from BASF Lumogen F range also as layers; Violet 570 Yellow 083. The...
Abstract In this work, the structure, elasticity parameters, and buildup factor of borosilicate glasses doped with BaO, CdO NiO have been studied. Infrared (IR) spectroscopy was utilized to study internal structure present system. IR spectra are broad, especially since superposition between borate silicate occurs in same spectral region. A deconvolution process carried out extract these into their individual bands. The values tetrahedrally-coordinated boron atoms ratio ( <?CDATA ${N}_{4}$?>...
A multitude of applications is related to the unique properties absorption, scattering, and plasmon-enhanced phenomena metal nanoparticles (MNPs). The aqueous colloidal-based synthesis MNPs used more widely as it allows precise shape size control. However, for various applications, required have in an organic solvent or polymer that compatible with MNPs. This work establishes a protocol from phase transfer process gold nanorods core silver shell nanocuboids (Au@Ag NCs) dichloromethane....
Hybrid 3D Finite difference time domain-Monte Carlo ray tracing (FDTD-MCRT) algorithm has been developed to model and optimise small large scale plasmonically-enhanced luminescent solar concentrator (pLSC) devices for photovoltaic (PV) applications. The configuration parameters (for example, dimensions, shape, optical properties of metal nanoparticles, species, host material) were used characterise the probability energy transfer loss processes, as well reflection, refraction, absorption,...
Polarization-sensitive anisotropic plasmonic interaction between gold nanorods (AuNRs) and quantum dots (QDs) encapsulated in an epoxy resin polymer has been experimentally investigated. The utilized the polarization-dependent properties of aligned AuNR AuNR-QD composite. AuNRs were by external AC electric field 3.5 ×105 Vm-1. modified QD absorption emission dependent on excitation light polarization maximum enchantment 10% 59%, respectively. Moreover, induced directional QDs improved decay...
The main energy losses in solar cells are related to spectral where high photons not used efficiently, and is lost via thermalization which reduces the cell’s overall efficiency. A way tackle this introduce a luminescent down-shifting layer (LDS) convert these into lower bracket helping cell absorb them thus generating greater power output. In paper, lumogen dye Violet 570 has been as LDS coated films of 10μm 60μm placed on top Si cells. was incorporated polymer Polyvinyl Butyral (PVB)...
The finite difference time domain (FDTD) method is a grid-based, robust, and straightforward to model the optical properties of metal nanoparticles (MNPs). Modelling accuracy can be enhanced by increasing FDTD grid resolution; however, resolution size limited memory computational requirements. In this paper, 3D optimized (OFDTD) was designed developed, which introduced new approximation terms based on physical events occurring during plasmonic oscillations in MNP. proposed not only required...
Novel field emission devices with dimensions an order of magnitude less than the elastic mean free path electrons in air have been fabricated and tested at atmospheric pressure. It is well known that operating voltage may be decreased by reducing radius emitter tip distance between extractor electrode. We developed a nanoscale-tip system consisting multiple tips radii about 1 nm within aperture 50 diameter. All nanopillar were 30 from electrode both horizontal vertical directions, so...
The photovoltaic (PV) optical losses decrease the number of collected photons resulting in decreasing total PV conversion efficiency. One solution to increase external quantum efficiency (EQE) is using luminescent materials which can be applied by either coupling a down shifting (LDS) thin film top surface or doping cell encapsulation layer with materials. In this paper, Monte Carlo ray tracing (MCRT) algorithm has been developed predict EQE and current density device consisting...
The quantum dot solar concentrator optical efficiency is undermined by the parameters of re-absorption, scattering, and escape cone losses. These losses can be address through enhancing (QDs) absorption emission. This have been achieved plasmonic coupling between QDs gold nanoparticles (Au NPs). composite various concertation Au NPs were studied. spacing controlled concentration distribution both QD in composite, it showed a significant increase which more pronounced for higher spectral...
Organic dyes are the most commonly used luminophore in Luminescent Solar Concentrator (LSC), their fluorescent quantum yield (FQY) is required to be near unity host matrix, however, it strongly affected by matrix material and concentration of used. In this work, silicone encapsulant has been compared Poly(methyl methacrylate) PMMA for use LSC. Concentration doping two commercially available different optimized Silicone form LSC layers. The FQY these determined material. Finally, stability studied.