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Thin Film Transistors based on amorphous Indium–Gallium–Zinc-Oxide (a-IGZO TFT) are receiving a great deal of attention for their numerous applications as alternatives for amorphous and poly-crystalline Silicon based TFTs. A major concern about a-IGZO TFTs is that they suffer from instabilities when subjected to different types of stress (bias, light, etc …). Stress is believed to create defects of...
WO3 layers were grown on glass substrates by pulsed DC magnetron sputtering. A series of WO3 layers were deposited at different growth powers changing from 0.7 kW to 1.5 kW. The effects of the growth power on the electrochromic properties of WO3 thin films were investigated. By using X-ray diffractometry, it was obtained that WO3 thin films had amorphous crystal structure. Electrochromic measurements...
Earlier developed approaches to the formation of composite polymer-containing coatings by plasma electrolytic oxidation (PEO) using various low-molecular fractions of superdispersed polytetrafluoroethylene (SPTFE) have been summarized and a unique method for the formation of composite polymer-containing coatings at the surface of magnesium alloy MA8 has been suggested. The improvement in the corrosion...
This contribution reports on the effect of thermal annealing on sputtered Pt–Al2O3 multilayered selective solar absorber coatings deposited onto stainless steel substrates with a Mo IR reflecting buffer layer. The Pt–Al2O3 cermet nanocoatings were annealed at different temperatures for different durations in vacuum. The spectral selectivity of the optimised Pt–Al2O3 was found to be thermally stable...
ZnO:Al thin films were deposited onto glass substrates by RF-magnetron sputtering system. The crystallographic orientation of the films, determined using an X-ray diffractometer (XRD), had a high c-axis orientated crystalline structure along (002) plane. The grains are densely packed as shown in the surface micrograph. The electrical parameters were carried out using Hall Effect measurements. The optical...
In this study we investigated the deposition parameters of a PECVD silicon nitride (SiN) film leading to an efficient passivation of multicrystalline silicon solar cells. The parameters investigated were the temperature, the power and the refractive index through the gas process flow rate ratio SiH4/NH3.Using a symmetrical structure SiN/Si/SiN and Quasi-Steady-State Photo-Conductance (QSSPC) characterization...
The paper presents frequency f and temperature T dependences of the phase angle θ, conductivity σ, capacity Cp and tgδ for (FeCoZr)x(CaF2)(100−x) nanocomposite films deposited with the application of ion-beam sputtering of a complex target in the gas atmosphere of mixed argon and oxygen. The examined films are composed of metallic FeCoZr “cores” covered with FeCo-based oxide “shells” embedded in an...
The paper presents results of testing electric properties (resistance, capacity and phase angle in an equivalent parallel circuit) of ferromagnetic alloy-dielectric nanocomposites (FeCoZr)x(PZT)(100−x) produced by ion-beam sputtering in vacuum conditions. The measurements have been performed using alternating current within the frequency range of 50 Hz–1 MHz for measuring temperatures ranging from...
To find out the mechanism of high thermionic efficiency of one of the widely used electron emitters - LaB6, a comparative study of the state of Lanthanum and Boron atoms in a model double La–B submonolayer film, on one hand, and on separate La and B films - on the other, has been done by detecting the stretch mode of adsorbed CO molecules. The separate La and B films, as well as double La–B films,...
In the present study, 5 wt.% Ga2O3 doped zinc oxide (ZnO:Ga) films were deposited on glass substrates by r.f. magnetron sputtering, at room temperature. r.f. power influence on film characteristics was investigated in a wide variation ranges. Various methods were used to characterize the structural, electrical and optical properties of the films such as XRD, HRSEM-EDS, AFM, four point probe resistivity...
Cr–C deposits were electroplated on a pure Cu substrate in a Cr+3-based plating bath. After electroplating, the Cr–C deposits with and without a Cu substrate were flame-heated for 2 s to increase their hardness. Experimental results show that the hardness and crack density of a flame-heated Cr–C deposit were strongly affected by the Cu-substrate thickness. The hardness of as-plated Cr–C deposit with...
The effect of electro-annealing in vacuum and air on the optical and electrical properties of ITO thin films grown by large area DC magnetron sputtering was investigated. Moreover, the performances of the electro-annealed ITO thin films in vacuum and air were compared. Electro-annealing was performed by applying 0.75, 1.00, 1.25 and 1.50 A constant ac current to the ITO thin films. It was observed...
The La0.7Sr0.3MnO3−δ thin films were deposited on Si(100) by DC magnetron sputtering followed by annealing at 973 K for 0.5∼2 h in air/oxygen. The microstructure, room temperature reflectance and magnetoresistance (MR) of the annealed films were investigated using Glancing angle X-ray diffraction (GXRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) analyses and...
Nanocrystalline Al-doped ZnO (AZO) thin films were deposited on glass substrates by using sol–gel dip coating technique at different withdrawal speeds (WS: 20, 40 and 80 mm/min). The effects of WS on the crystalline structure, morphology and optical properties of the obtained films were extensively investigated using a series of characterization techniques, including X-ray diffraction (XRD), atomic...
The interest in the study of Cadmium oxide (CdO) for photonic applications has increased significantly because of its promising electrical and optical properties. Real solar cells based on an n-CdO/p-Si heterostructures show poor photovoltaic performance, however. In this work numerical simulation is used to elucidate this poor performance by considering two cases. CdO is firstly considered as a perfect...
The efficiency of solar photovoltaic (PV) cells has been one of the major problems impeding its global adoption as one of the sustainable substitutes to fossil fuel based technologies. Metamaterial (MTM) based solar cells offer an opportunity towards increasing the system efficiency by enhancing the total absorbed solar radiation incident on this device. In this study, a nanostructure-based MTM perfect...
The bulk Ge20Se50Te30 glasses were prepared by the melt-quenching method and the studied films of different thicknesses 100, 130, 160, and 200 nm were synthesized on glass substrates from the bulk glasses by the thermal evaporation technique under high vacuum. The stoichiometry of the studied thin films was determined by energy dispersive X-ray diffraction (EDX). The structure of the investigated...
The rapid increase in applications of terahertz waves requires new techniques to obtain continuous wave terahertz sources. Mesa structures fabricated from high-Tc superconductor Bi2Sr2CaCu2O8+δ (Bi2212) single crystal have been observed as an intense, coherent, continuous electromagnetic wave source in the terahertz (THz) frequency region. However, in order to produce coherent radiation with high...
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