Materials Literature
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We demonstrate a mid-infrared broadband absorber of full semiconductor epi-layers theoretically. The structure is of MIM-like with grating InAs(n-type, 220nm)/InAs(I,220nm)/InAs(n-type, 1000nm). The absorptivity is over 80% from 8 μm to 12 μm.
Ce mémoire traite de la chimie des complexes pinceurs de nickel (II) cationiques ayant un ligand de type POCOP. Elle se divise en deux parties. La première traite de la synthèse, de la caractérisation et de la réactivité des complexes cationiques pinceurs de Ni(II) de type POCOP (POCOP = 1,3-bis(phosphinitobenzene), o…
Biomaterials containing methacrylic acid (MAA) were termed “vascular regenerative” as they were previously shown to improve vascularization, diabetic wound healing and graft survival. It has been unclear how these biomaterials elicit such biological responses. The goal of this thesis was to follow up on earlier observ…
Η ιδιοπαθής αρτηριακή υπέρταση χαρακτηρίζεται από αυξημένη συχνότητα θρομβωτικών επεισοδίων, για την οποία ενοχοποιείται πλειάδα παραγόντων: η ενδοθηλιακή δυσλειτουργία, η κλινικά ανιχνεύσιμη αθροσκλήρωση, η αυξημένη δραστηριότητα του συμπαθητικού νευρικού συστήματος (ΣΝΣ) και του συστήματος ρενίνης-αγγειοτενσίνης-αλδ…
The manufacture of composite products often requires using combinations of several materials, forming a multilayer structure with the layers stacked in different direction, proper selection of the stacking sequence, etc. Due to these features, the process of developing composite structures is more time-consuming than…
Coronary artery disease is a major cause of death globally, and has led to the use of medical implants like coronary stents. Unfortunately, re-narrowing of the artery can occur (restenosis) due to an immune response towards the implanted ‘foreign’ device. A new approach to combat restenosis and reduce the stent-induce…
Restrictions of lead in solder lead to adoption of SAC305 in consumer products. While high reliability applications use SnPb, supply constraints are driving the adoption of a replacement. SAC305 has reliability concerns related to elevated process temperatures and the formation of Ag3Sn. \nReliability performance of t…
Harnessing abundant solar energy to facilitate the capture and conversion of greenhouse gas CO2 into carbon-based fuels and chemical feedstocks represents a significant scientific challenge with implications for both climate change and sustainable energy production. Herein, we have demonstrated that highly defected in…
In this study; a single negative textile-based metamaterial has been proposed for Industrial, Scientific and Medical (ISM) band applications. A tunable ε-negative region is obtained at 4.8GHz having a bandwidth value of almost 0.8GHz. A finite array is proposed that mimics the unit cell accurately and the scattering p…
The experimental and theoretical study of transition metal compounds have occupied condensed matter physicists for the best part of the last century. The rich variety of physical behaviour exhibited by these compounds owes its origin to the subtle balance of the energy scales at play for the d orbitals. In this thesis…
It is well-known that reflectarrays typically have a narrow bandwidth which is commonly attributed to the resonant nature of the antenna elements used and the narrow bandwidth of the phase shifting networks used. Typical approaches to increase the bandwidth include the use of true-time-delay (TTD) devices, coupling mu…
A method based on the combination of analytical method and numerical simulation for extracting barrier voltage in metal insulator metal (MIM) junction for passive intermodulation (PIM) calculation on mesh reflector was proposed, which significantly reduces the computation time of electrically large problems. The analy…
In this paper, a unit cell of composite right/left-handed transmission line (CRLH-TL) based on lattice network with microstrip monolayer circuit is presented. The right-handed (RH) and left-handed (LH) transmission lines with lattice topology are designed using microstrip quasi-lumped elements. Then one unit cell of C…
In this paper, we describe the results of research on the effect of the hot-pressing temperature on the spectral properties, density, and microhardness of aluminum–magnesium spinel ceramic. We fabricated experimental samples of a high-density ceramic (density exceeding 99% of the theoretical density) with high transpa…
Sintering semiconductor nanocrystals represents a possible low-cost route to creating functional bulk absorber layers for photovoltaic applications. Here we highlight the critical aspects of sintering CdTe tetrapods into smooth, dense, polycrystalline films that are capable of yielding >7% efficient solar cells with j…
A black silicon solar cell fabricated using aluminum as both a catalyst and dopant is demonstrated. A nanowire/nanopyramid black silicon surface texture is grown via aluminum (Al)-catalyzed vapor-liquid-solid growth, and post-growth annealing diffuses the aluminum into the n-type substrate, forming a p-n junction. Dev…
In this work we study the carrier population dynamics in an AlGaAs p-i-n single junction solar cell with 10 layers of InAs quantum dots (QDs) in the i-region. Light management and band engineering technics were used to optimize intermediate band solar cells (IBSCs) operation. The IBSC operations are investigated throu…
We have reported InAs/GaAs and InGaAs/GaAs quantum dot solar cells (QDSCs) and the effect of rapid thermal annealing (RTA) on their optical properties. A thermal stability was observed up to 700°C, and further increase in temperature results in a blue shift in photoluminescence (PL) emission peak. A maximum open circu…
The InN pillars/p-GaN is promising for extended visible and infrared absorption. The higher growth temperature and more V/III could trend toward hexagonal InN pillars epitaxy, fabricated by a low-pressure metal organic chemical vapor deposition. The tensile strain effect and the peak energy blue-shift phenomenon due t…
In this work, we study optical properties of all-dielectric metasurfaces on the top of high-index substrate. We perform numerical simulations of spherical nanoparticle arrays for different permittivities of the substrate, and propose a simple model with separate contributions from nanoparticle arrays and bare substrat…