Materials Literature
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In this work an advanced overview in the field of near-infrared silicon photodetectors, is presented. Proposed photodetectors are based on the internal photoemission effect through a Schottky junction and their fabrication results completely compatible with the silicon technology. Taking advantage of both new structur…
In this paper, the strain-dependent efficiency of multijunction solar cell (MJSC) is reported for the first time. Using multilayered strain model, the strain induced due to the change in lattice constants in different layers of MJSC is calculated. With the combination of strain and deformation potentials the strain-in…
Zirconia ceramic coatings on zirconium were prepared by micro-arc oxidation (MAO) method in mixed electrolyte of calcium glycerophosphate and calcium acetate. Effect of oxidation time on microstructure, element composition and phase composition of the coatings were analysised by X-ray diffraction, scanning electron mi…
Superconformal electrodeposition enables the fabrication of high aspect ratio interconnects that are ubiquitous in microelectronics. The Curvature Enhanced Accelerator Coverage (CEAC) mechanism captures the morphological and kinetic aspects of many “superfilling” processes for Damascene interconnect fabrication [1-4].…
This paper presents the design of a dual-band power amplifier operating at 2.4 GHz and 3.35 GHz. The proposed topology is based on the use of composite right/left-handed unit cells. A composite right/left-handed cell exhibits a dualband frequency response at an arbitrary pair of frequencies because of its phase charac…
A hybrid synchronously rotating reference frame (HSRRF)-based voltage sag detection is proposed in this paper. The proposed method provides the fast and accurate voltage sag detection even in the distorted grid voltage environments. A hybrid algorithm is used to improve the performance by a combination of the instanta…
In order to study the treatment of simulated radioactive graphite contains 90Sr by SHS and its β-irradiation stability, waste forms were prepared in accordance with the reaction 3C + 4Al + 3TiO2 = 2Al2O3 + 3TiC+Q, by self-designed SHS equipment. Then the β-ray irradiation experiments were done at dose of 106Gy to eval…
Pressure-free microwave processing of polycrystalline materials has demonstrated rapid, efficient sintering attributed to volumetric heating and microwave-activated mass transport. However, the potential for improved sintering in the nanoparticle regime has often not been realized in part because of the tendency of na…
Friction at the workpiece–die interface significantly affects material flow behaviours in micro metal-forming processes. The purpose of this study was to estimate the friction factor at the workpiece–die interface in the combined forward and backward hollow extrusion of brass at micro scale. The effects of grain size…
Two of the most important characteristics of electric vehicle motors are low cost and high reliability. Armature windings are difficult to manufacture with automated techniques and are not very reliable. Thus, to obtain a motor with low cost and high reliability, we have investigated a transverse-flux motor (TFM) cont…
The ever-increasing demand for more functionality of electronic and optoelectronic components led to increased packaging and thermal power densities. Higher processing density can be reached by developing thermal management solutions. The current technology in electronic packaging is to attach the die to heat spreader…
In-situ doping of Tb3+ ions in silicon oxides and oxynitrides deposited by electron-cyclotron-resonance plasma enhanced chemical-vapour (ECR-PECVD) has been performed. Oxygen and nitrogen gas flow rates were changed to produce a gradual substitution of oxygen by nitrogen in the host matrix. Bright green luminescence f…
This paper describes the complementary study of plasma-emission wavelength by optical emission spectroscopy (OES) and the experimental results collected from an x-ray photoelectron spectroscopy (XPS) directly over the etched wafer. We have monitored two kinds of etch processes, where the chemistry used was based on CF…
This feature issue on “Optical Materials for Flat Panel Displays” of Optical Materials Express spotlights recent advances in optical materials for information display applications. It comprises 12 papers primarily on liquid-crystal and light-emitting materials and their devices. It is hoped that the present special th…
The work presents the results of studying the growth processes and luminescent properties of the single crystalline films of CaWO4and CaWO4:Bi tungstates, grown by the Liquid Phase Epitaxy (LPE) method.
The knowledge of stochastic breakdown behaviour of environmental friendly gas mixtures become more and more important with respect to the required replacement of SF6- insulated apparatus. To obtain the necessary withstand values of breakdown voltage at the variety of desired parameters a statistical treatment of the m…
The paper reports study of complex structure of matrix emission of undoped and RE-doped PbWO4crystals. Decomposition of the spectra shows contributions of five components at 410, 485, 520, 565, 635 nm in emission of all the investigated samples. Their relative contributions depend on RE doping. Observed effects of RE…
An epoxy resin with liquid crystal aromatic esters of epoxy resin (TPBDER) used as modifier of epoxy resin was synthesized form 4-Hydroxy benzoic acid, 4,4'-Dihydroxydiphenyl, epichlorohydrin(ECH). Epoxy resin (ER) was modified by TPBDER for improving both thermal and mechanical properties of electronic packaging mate…
The electronic structure of a superlattice, made of a topological insulator (Bi2Se3) and a normal metal (Ca/Sr alloy), has been studied by first-principle calculations. Even though spatial inversion and time-reversal symmetries require all electronic states in the system be spin degenerate spin separation in real spac…
Dissolved gas analysis (DGA) in transformer oil is considered as one of the preferred projects to discover the potential faults of the transformer. To identify the aging characteristics of oil-immersed transformer oil in long-term operations, it is important to study relationship between total hydrocarbon and gases di…