Materials Literature
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We propose an elliptical silicon nanohole (SiNH) array for broadband light absorption in thin film silicon solar cells. Our analysis shows that this architecture is capable of increasing the ultimate efficiency of a thin film silicon solar cell by 17.6 % in comparison to that of the circular SiNH array with the same f…
We used steady state and picosecond transient photoinduced absorption (PA), excitation dependence (EXPA(ω)) spectrum of the triplet exciton PA band, and its magneto-PA (MPA(B)) response to investigate singlet fission (SF) of hot-excitons into two separated triplet excitons in luminescent π-conjugated polymers. From th…
Optical light modulation in photorefractive liquid crystal cells depends strongly on the relative voltage drop across the photoconductive and liquid crystal layers. This quantity can be estimated using the Voltage Transfer Function, a generalization of the standard cross polarized intensity measurements. Another advan…
The maximization of the intrinsic optical nonlinearities of quantum structures for ultrafast applications requires a spectrum scaling as the square of the energy eigenstate number or faster. This is a necessary condition for an intrinsic response approaching the fundamental limits. A second condition is a design gener…
Nonlinear optics has drawn much attention for its great potential in applications, such as frequency conversion, multiple-photon absorption, self-focusing, and so on. However, such optical nonlinearities are generally observed at very high light intensities. In this study, we designed hybrid-aligned dye-doped polymer-…
The new device architectures and materials being introduced for sub-10nm manufacturing, combined with the complexity of multiple patterning and the need for improved hotspot detection strategies, have pushed current wafer inspection technologies to their limits. In parallel, gaps in mask inspection capability are grow…
We suggest a new paradigm for solar cells that uses a nanostructured crystalline collector (silicon) in an amorphous absorber matrix (hydrogenated amorphous silicon). Previously amorphous absorbers have received no serious consideration because of their low carrier mobilities. Specifically, we demonstrate that carrier…
Using a new variant of photoelectron spectroscopy, we measure the homogeneous near-nodal pairing ($Δ$) and pair-breaking self-energy ($Γ_S$) processes for a wide range of doping levels of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$. For all samples we find that the pairing extends above the superconducting transition T$_c$ to a sca…
For Cu-Si system, numerical simulation provides the best prediction of optimal parameters for minimum conversion time. Identification and clarification of the different wetting regimes and infiltration behaviour of liquid Cu-Ti alloys in the Cu-Ti/C system is a great development to the aerospace industry. This chapter…
We developed a method of precise isotope labeling to visualize the continuous\ngrowth of graphene by chemical vapor deposition (CVD). This method allows us to\nsee in real time the growth of graphene monocrystals at a resolution of a few\nseconds. This technique is used to extract the anisotropic growth rates, the\nfo…
Gallium nitride nanowires were grown on c-plane, r-plane and m-plane sapphire substrates in a showerhead metalorganic chemical vapor deposition system using nickel catalyst with trimethylgallium and ammonia as precursors. We studied the influence of carrier gas, growth temperature, reactor pressure, reactant flow rate…
Heusler compounds are cubic intermetallics with a wide range of interesting properties, which are closely related to the structure of the material. In addition, several exotic physical phenomena have been predicted for different compositions in the family, but have not been experimentally realized. By and large, the l…
Magnetoelectric (ME) properties are investigated in heterostructure trilayered composite of poled Pb(Zr0.52-Ti0.48)O3 and NiFe2O4 (PZT-NFO-PZT) sample at various frequencies. The ME voltage induced in the sample changes with change in frequency of the AC magnetic field. This change when minutely analysed using multiph…
This chapter investigates interfacial phenomena and the effects of small addition of Ti in Carbon/Copper (C/Cu) composites. The additions of Ti into Cu melt promote the reactive wetting between liquid Cu alloy and graphite due to the formation of carbides. It shows general equations that describe the interfacial pheno…
When confronting an item that may contain nuclear material, it is urgently necessary to determine its characteristics. Our goal is to provide accurate information with high-con dence as rapidly as possible.
The use of natural fibers as engineering material component has grown impressively in recent years, the main reasons for this are the environmentally friendly production process and the CO2 neutral process during the fiber industrial manufacturing procedure, some use examples include cotton fiber reinforced polyester…
Research is focused on remelting the surface of a Ti substrate in a nitrogen rich environment using a commercial laser engineered net shaping (LENS™) technique, leading to in situ formation of titanium nitride on the surface of titanium. The titanium nitride layer show higher hardness and wear resistance compared to T…
Nanocrystalline diamond (NCD) thin films, a recent process technology development, possess smooth surfaces making them attractive for high technology applications. This chapter carried in-depth investigations of the dielectric properties of micro- and nanocrystalline diamond from room temperature up to 550 °C. In part…
This chapter reports preliminary results from the sintering of RE-doped Al2O3 in multi- and single-mode microwave systems. Powders and sintered pellets are characterized via Archimedes density measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The focus…
The main aim of this PhD project is to investigate the fire structural properties of a sandwich composite representative of the material used in naval ship structures. Using experimental techniques and analytical models, this PhD investigates the structural response of sandwich composites during and following fire exp…