Materials Literature
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Proses pengurangan ketebalan, penghalusan dan perataan permukaan pada pelat pewter dari proses penuangan oleh usaha kecil di Pulau Bangka masih dilakukan dengan menggunakan metode pengamplasan sehingga waktu yang diperlukan untuk proses tersebut lama. Untuk membantu proses tersebut, maka dilakukan proses pengerolan de…
An examination is made of the results of investigating the influence of the concentration of nanoparticles and graft copolymer (modifier) on the main physicomechanical characteristics of styrene plastics. The limiting concentrations of nanoparticles with which the maximum strength properties are achieved are determine…
The synthesis of fine powder of boron carbide using carbon nanofibers (CNFs) was studied. The powders of boron carbide (B4C) were characterized by X-ray diffraction (XRD), elemental analysis, scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX), BET surface area, simultaneous the…
Power system is a complicated object including a large number of structural elements. Rank models allow us to predict the structural properties of the energetics objects. If we imagine the object (system) in a hierarchical structure, where there are nodes that differ in a certain value, it is possible to apply the ran…
DFT method has been carried out to study the substitution effects of NO 2 group on the electronic properties (ionization potential, electron affi nity, electronegativity, hardness, softness and electrophilicity index) and IR spectral properties of biphenyl and derivative molecules by using the B3LYP functional and the…
Spark Plasma Sintering (SPS) is normally carried out to obtain consolidated materials of low residual porosity. SPS can also be used for the preparation of partially densified (porous) materials. Partial densification is achieved during SPS by using relatively low sintering temperatures or pressureless conditions. For…
Water jet technology that uses abrasive particles is an efficient cutting method, for electrical steels and it has many advantages, by comparison with the classical punching. During the cutting process there are not any heating phenomena and the method has a high versatility with a minimum applied stress on the work p…
We propose a new ultrathin broadband metasurface to manipulate electromagnetic wavefront and take it into application for high-gain antenna. The symmetrical element is composed of orthogonally I-shaped structures and a meta-grounded plane spaced by a dielectric isolator, with the thickness of about 1/10 wavelength. Th…
Three different series of p-type (100) Crystalline Silicon (c-Si) FZ wafers of about 270 μm thickness with resistivity of 2-4 Ω-cm were textured by three different concentrations of KOH (2.5 wt.%, 3.5 wt.%, and 4.5 wt.%). For every series of textured wafers, three samples were textured, each of 1×1.5 inch2size. The te…
In this study we present beneficial effects on the device performance with a Ge-assisted crystallization of nanocrystalline CZTSe precursors. For low Ge content layers, an increase in doping density is observed, which results in 8.6% efficiency devices and Vocvalues of above 470 mV, corresponding to Voc deficits of 58…
Fabrication of metal/semiconductor (“hybrid”) nanoparticles is still a challenge due to the absence of methods of a metal core coating by crystalline semiconductor shell. We propose a novel principle of formation of a core-shell nanoparticle made of liquid silicon and gold droplets. Molecular dynamics simulations of t…
A novel nano-structured organic solar cell architecture is designed and evaluated. Using simulations to observe the effects of nano-scale light scattering, it was observed that the nanostructure has a dual functionality - firstly, it helps in increasing the average generation rate in the active volume significantly an…
N-type crystalline silicon can be expected to achieve high-efficiency compared with p-type one. For the n-type solar cells, silver/aluminum paste has been used as metallization for p+emitter, which induces loss in open circuit voltage (Voc) of the cells. In this study, the effects of glass frit in the metallization pa…
Cd2SnO4(CTO) is an interesting transparent conducting oxide (TCO) material for CdTe photovoltaic devices, but high quality CTO typically requires a post-deposition high temperature annealing step to promote crystallization. Wu [1] showed that deposition of the CdTe absorber layer by closed space sublimation (CSS) coul…
Bi-facial solar cells with ultrathin CIGS solar cells are fabricated to investigate the influence of back contact passivation. Solar cells with CIGS thicknesses of 300 and 500 nm and with an ultrathin transparent Mo layer are characterized using EQE measurements from both the front and the rear side as well as with I-…
New techniques to fabricate highly doped p-type and n-type crystalline-Si (c-Si) layers at relatively low temperature were applied to solar cell devices. A very thin n-type emitter is formed by exposing phosphine (PH3) gas on c-Si surface around 600 °C. PH3molecules can react with dangling bonds on the surface, and in…
In this work, we implement CMOS-compatible one-dimensional photonic structure based on silicon-on-insulator wafer supporting optical bound states in the continuum at telecommunication wavelengths - localized optical state with energy lying above the light line of the surrounding space. Such high-Q states are very prom…
Single junction n-i-p type amorphous silicon solar cell was investigated with various p-type window layers. A high doped silicon oxide (P1) layer was used to extract holes from the active layer while a highly conducting micro-crystalline silicon p-type layer was used as an electrical contact layer with the transparent…
In this paper, we describe a model allowing for the optimization of the thickness of the anti-reflective (AR) coating for Cu (In1-xGax) Se2(CIGS) solar cells. This model is based on an optical model developed based on transfer matrix theory as well as accurate measurement of the dielectric function and thickness of ea…
Determination of module temperature coefficients for voltage, current and power requires measuring the average of cell temperatures. Conventional practice is to place thermocouples or resistive temperature devices (RTDs) at a few locations on a module's back surface and to average the readings, which may not accuratel…