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Solid electrolytes based on chalcogenide glasses have been one of the most promising candidates for the next generation non-volatile memories. Here we propose a new application of chalcogenide solid electrolytes for low cost, high performance microelectronic radiation sensor that reacts to γ-radiation to produce an easily measurable change in electrical resistance. The active layer material is Ag-doped...
In this work a very low cost and conventional technique was used to prepare Ge nano/microstructures by means of filling the material inside porous silicon (PS) using thermal evaporator. PS was prepared by anodization of Si wafer in ethanoic hydrofluoric acid (HF).The Ge layer was deposited onto the PS by thermal evaporation.Subsequent annealing at 650°C and 750 C for 30 mins were done to drive in...
Polycrystalline films of semiconducting Cu(In1-xGax)Se2 (CIGS) quaternary alloy, one of the promising materials for photovoltaic applications, have been prepared by means of chemical spray pyrolysis (CSP). Copper, Indium and Gallium metal chlorides and Selenourea are used as constituent elements to prepare spray solution. Single phase CIGS films with chalcopyrite structure have been successfully grown...
In this study, a simple potassium hydroxide (KOH) treatment was applied to functionalize the surface and to modify the structures of multi-walled carbon nanotubes (CNTs) grown on silicon substrates by thermal chemical vapor deposition (thermal CVD). Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and energy dispersive spectrometer (EDS) were employed...
DLC and metal/DLC nanocomposites coatings deposited by means of pulsed laser deposition /PLD/ technique, using high power UV nitrogen laser are described. The DLC and M/DLC nanocomposite coatings are deposited on substrates stents made from 316L SS material and NITINOL (NiTi) alloy. The tests and analysis of the morphology-, structure-, physical-, mechanical- electrochemical- and chemical parameters...
The behavior of transition metals in ZnO has become an important topic for spintronics. As the fundamental property, the nano-structural characteristics of the transition metal implanted ZnO have been studied. It is clearly observed that in ZnO the Mn+ implantation and post-annealing result in (1) the formation of crystallographically orientated Zn nanocrystals within the ZnO matrix and (2) Mn atoms...
Thin films of nanocrystalline CuGaS2 chalcopyrites have been prepared by chemical vapor transport (CVT) using elements of Cu, Ga, and S with iodine as the transporting agent. Crystalline layers of CuGaS2 have been grown using various iodine concentrations but with constant source materials, growth zones temperatures and growth durations. The films were grown onto sapphire (Al2O3) substrates. The deposits...
Polycrystalline silicon still guarantees its application on solar cells as important market product until year 2050. Due to the increase of photovoltaic industry needing, technologies to produce low cost silicon will be needed. The metallurgical grade silicon (Si-GM) has been used to produce Si substrates by the atmospheric plasma thermal spray (APTS) which has the advantages of a low cost and fast...
A simple method to synthesize Gallium Nitride (GaN) powder using gallium trichloride (GaCl3) and ethylene diamine tetra acetic acid (EDTA) as starting materials has been discussed in this article. GaN nanocrystals were synthesized by nitradation of Gallium-EDTA complex at different temperatures of 600??C, 700??C, 800??C and 900??C in ammonia (NH3) atmosphere. X-ray diffraction analysis revealed the...
A thin palladium layer (~20 A) was selectively formed on top of amorphous germanium film before annealing and the effects of palladium layer on the lateral crystallization behavior of the amorphous germanium film were investigated through optical microscope, Raman spectroscopy, transmission electron microscopy, energy dispersion X-ray spectroscopy and selective area electron diffraction. Lateral crystallization...
This paper reports on the production of carbon coatings onto a silicon substrate, using a lower power radiofrequency (RF) generator, combined with a plasma immersion ion implantation (PHI) driver. An RF, 13.6 MHz, generator operating at 30 W, was used to produce plasmas using a mix of C2H2 and H2 as feeding gas. In the experiments, a mirror polished silicon (100) substrate is exposed to the RF plasma...
The simultaneous electrodeposition of the Cu-In-Se system was investigated. The study was carried out at pH 1.8 using sodium citrate as complexing agent for the Cu2+ ion. The synthesis of CuInSe2 semiconductor thin film was carried out by electrodeposition on indium-tin oxide (ITO) /soda-lime glass. The simultaneous composition of the Cu, In, and Se was achieved by constant potential electrolysis...
Carbon nanotubes were prepared by using a hot filament chemical vapour deposition (HFCVD) system. Methane diluted in hydrogen was used as the reaction gas and nanosized nickel particles were used as the catalyst. Studies on the effect of catalyst preparation and growth conditions were conducted. The carbon nanotube produced under different conditions were characterized using field emission scanning...
We report on microscopic structural characterizations of multicrystalline SiGe (mc-SiGe) bulk crystal, which contains microscopic compositional distribution, and discuss possible influence on solar cell applications. By combining microscopic Raman spectroscopy and energy-dispersive X-ray analysis, the existence of built-in strain and its spatial distribution were experimentally obtained. By a simple...
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