Ziad AbuwaarUniversity of Jordan | UJ
Ziad Abuwaar
Doctor of Philosophy
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32
Publications
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Introduction
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Publications
Publications (32)
We present a study of photoluminescence (PL) from uncapped non-oxidized and oxidized InAs quantum dots (QDs) on GaAs substrate as a function of the thickness of a GaAs capping layer. A photoluminescence system in ultra-high vacuum that was coupled onto a molecular beam epitaxy chamber was used in order to avoid the oxidation of the quantum dot surf...
Atomic force microscopy and photoluminescence PL measurements were carried out to investigate the role of the morphology of GaAs/ Al 0.3 Ga 0.7 As ringlike nanostructures on their optical properties. A small amount of Ga material less than three monolayers was used to fabricate single ringlike and double ringlike DRL nanostructures using droplet ep...
Spectroscopic study of the InAs quantum dot (QD) formation in GaAs ringlike nanostructures is carried out. Ga droplet epitaxy is used to form GaAs ringlike nanostructures. Subsequently InAs is deposited to obtain InAs QDs by self-assembly inside the holes of the nanostructures. Regularly spaced bands in the photoluminescence spectra exhibit state f...
Using (100) GaAs substrates as a reference, we present a study of the formation of Ga droplets on (311)A and (511)A GaAs substrates in which the effect of both the substrate temperature and the amount of Ga supplied on the droplet density and height for the three different surfaces have been investigated. Droplets on (100) substrates show a round s...
We report a comprehensive discussion of quantum interference effects due to the finite structure of neutral excitons in quantum rings and their first experimental corroboration observed in the optical recombinations. The signatures of built-in electric fields and temperature on quantum interference are demonstrated by theoretical models that descri...
Among hexagonal close packing (hcp) metals, zinc has a non-ideal hcp structure due to a significantly increased axial ratio c/a. We studied the behavior of the ratio of lattice constants c/a and the ratio of thermal displacement parameters (U_33 / U_11) in the temperature range of 100-300 K, using the X-ray total scattering atomic pair distribution...
This study provides insights into the design and analysis of surface acoustic wave sensors customized for detecting volatile organic compounds (VOCs), utilizing an innovative AlN/diamond/Si multilayered configuration. The results are explored numerically using finite element method simulation within the COMSOL Multiphysics package. The potential of...
In this study, we designed and simulated a new double absorber perovskite solar cell device by performing numerical analysis using SCAPS-1D. The architecture of the solar cell device consists of Glass/FTO/C2N/CsSnGeI3/CsSnI3. Optimizing the core parameters of CsSnGeI3 implied to an encouraging solar cell performance with a remarkable power conversi...
The study explores the impact of PANI:PSS as a hole transport material in perovskite based solar cell. Numerical analysis employing the SCAPS-1D simulator is conducted to track this impact. The effect of tuning several physical parameters of PANI:PSS, such as charge carrier density, charge carrier mobility, and defect density on the solar cell perf...
This study explores the impact of PANI:PSS as a hole transport material in the perovskite based solar cell. This impact is tracked by numerical analysis using the one-dimensional solar cell capacitance simulator (SCAPS-1D). The effect of tuning several physical parameters of PANI:PSS, such as charge carrier density, charge carrier mobility, and def...
Zinc metal has a hexagonal close packing hcp structure with an unusual axial ratio c/ a. This work presents the local atomic structure analysis of elemental zinc using the x-ray atomic pair distribution function (PDF) method and total synchrotron x-ray scattering in the temperature range of 100–300 K. In this PDF study, we determined the evolution...
In this paper, the double-absorber solar cell based on C2N and FASnI3 as echo-friendly absorber materials has been modelled and simulated. Numerical simulations were performed by utilizing the one-dimensional solar cell capacitance simulator (SCAPS-1D). The study shows that optimizing the parameters of the solar cell layers is vital to achieving hi...
In this paper, the C2N based solar cell has been developed and simulated with varied buffer layers (MZO, IGZO, Cd0.5Zn0.5S, and PCBM). The study is performed by utilizing the SCAPS-1D. The obtained results appear that a careful optimization of C2N parameters results in a good device performance. Increasing the thickness to 1000 nm in C2N is desirab...
In this paper, numerical modelling and simulation using SCAPS-1D software have been carried out in order to investigate the effect of different buffer layers (CdS, CdSe and CdTe) on the efficiency of Cu2ZnSnS4 (CZTS) solar cells. The photovoltaic properties (open-circuit voltage (VOC), short-circuit current density (JSC), Fill Factor and Efficiency...
Rice flour composition played a key role in determining the changes in pasting properties of rice flour. The influence of incorporating defatted rice bran (DFRB), rice bran fiber (RBF), rice bran protein (RBP), and stabilized rice bran (SRB) fractions on the mechanism of rice flour pasting viscosities was investigated. Pasting properties of long- a...
The impact of temperature on the viscoelastic properties of cheddar cheese was examined. Cylindrical samples of 20 mm diameter and 30 mm height (diameter-to-height ratio of 0.67) were prepared. Uniaxial compression tests were performed under three different temperatures (4, 15 and 25°C) using a TA-XT2 plus texture analyzer. Stress relaxation tests...
We report a comprehensive discussion of quantum interference effects due to the finite structure of excitons in quantum rings and their first experimental corroboration observed in the optical recombinations. Anomalous features that appear in the experiments are analyzed according to theoretical models that describe the modulation of the interferen...
We demonstrate a number of unseen self-assembled nanostructure complexes fabricated on various GaAs surface indexes by droplet epitaxy. Even under identical growth conditions, the configuration of nanostructure complexes is distinctive on each surface. The morphology evolution of nanostructure complexes is kinetically and energetically analyzed in...
The authors have investigated a shape transformation during the vertical stacking of InGaAs quantum rings (QRs) on GaAs(001). Samples have been grown by means of molecular beam epitaxy. The initial QR layer exhibits nearly round-shaped, flat disks. Especially for a very thin spacer layer of 2 nm , the topmost QRs in a twofold stack tend to be of el...
The evolution of InAs quantum dot (QD) formation is studied on GaAs ring-like nanostructures fabricated by droplet homo-epitaxy.
This growth mode, exclusively performed by a hybrid approach of droplet homo-epitaxy and Stransky-Krastanor (S-K) based QD
self-assembly, enables one to form new QD morphologies that may find use in optoelectronic applica...
The evolution between lattice-matched GaAs/Al0.3Ga0.7As single and double ring-like nanostructures is studied, with an emphasis on the construction and destruction of the observed outer ring. Using droplet epitaxy, this was achieved by directly controlling the Ga surface diffusion on GaAs(100). Double ring-like nanostructures were observed at relat...