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ITO thin films were prepared by changing the experimental parameters including gas flow ratio, sputtering pressure and sputtering time in DC magnetron sputtering equipment. The stable experimental parameters of Ar flow at 70 sccm, O 2 flow at 2.5 sccm ∼ 3.0 sccm, sputtering pressure around 0.5 Pa, and sputtering time of 80 s were obtained. Under these parameters, we had achieved the ITO thin...
An approach for designing an electron gun for a high efficiency, high linearity 0.14 THz traveling wave tube (TWT), has been presented. A Pierce electron gun of beam perveance 0.0047 μP has been designed for a high gain, high linearity and high efficiency 0.14 THz TWT using CST STUDIO SUITE Charged Particle Simulation soft and electronic optical software TAU. The initial gun geometry, as obtained...
The electron beam four-dimensional quality test system was developed targeted at the 5–100 mA electron beam current of a high-voltage electron beam welding machine. The system includes the control module, sensor module, driver module, and analysis software, which is based on the complex programmable logic device (CPLD). The quality test system obtains the data of quasi-instantaneous power density...
PbSe films have been deposited on glass and quartz substrates at room temperature by thermal evaporation technique. X-ray diffraction patterns of the obtained films showed that they have polycrystalline texture and exhibit cubic FCC structure. The optical constants, the refractive index n and absorption index k were calculated in the spectral range of 400–4000 nm from transmittance and reflectance...
GaN films were deposited on Si (111) substrates at a high growth rate of 94 nm/min using middle-frequency (MF) magnetron sputtering method with anode-layer ion source assistance. XRD, TEM and PL experiments were used to investigate the structure and optical properties of the resulting films. GaN films produced under optimal conditions have an almost 1:1 N: Ga ratio. The O concentration decreased while...
We report the fabrication and electrical characteristics of high-performance amorphous indium gallium zinc oxide (a-IGZO) thin-film transistors (TFTs) with a polymer gate dielectric prepared by spin coating on a glass substrate at different oxygen partial pressure values. The transmittance of the deposited polymer film was greater than 90% at 600 nm a-IGZO thin films were deposited on glass substrates...
The electron transport properties are theoretically investigated in a nanostructure under the influence of magnetic barriers and the δ-doping. The resulting transmission and spin polarization are strongly dependent on the weight of δ-doping. It is shown that the large spin polarization can be achieved due to the remarkable discrepancy in the transmission for electrons with opposite spin orientations...
Semicrystalline polycarbonate (PC) films were irradiated under vacuum at room temperature by C +5 beam of 55 MeV energy at fluences of 3 × 10 11 and 3 × 10 13 ions cm 2 . Ion induced modifications were studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and thermally stimulated discharge current (TSDC) techniques...
Faraday cup (FC) is a beamline diagnostic which is used to measure the total charge of pulsed beams. The reliable operation of an FC depends on its ability to recapture the ejected electrons when energetic particles strike with interior cup(IC) of an FC. In this paper COMSOL multi-physics software is used to investigate the performance of two new proposed FCs. The FC with A = 40 mm and B = 98 mm had...
We have investigated neutron irradiation effects on the optical, structural and chemical properties of polyallyl diglycol carbonate (PADC) polymer, commercially named as CR-39. For this purpose, PADC samples were exposed with 4 MeV Am–Be neutron source at fluences varying from 2.36 × 10 6 to 5.94 × 10 7 n/cm 2 . The modifications so induced were analyzed using UV–Visible spectroscopy,...
NbN films were deposited on SS substrates by reactive DC magnetron sputtering at various N 2 flow rates and substrate biasing. Coatings were studied for their thickness, structure, hardness and adhesion aspects. Process parameters were optimized for deposition of NbN coatings. NbN coatings were then extended on to MS substrates with Cr interlayer in three different thicknesses of 2, 4 and...
Metallic zinc film with various surface roughnesses was deposited on Si (100) substrates by ion beam sputter deposition utilizing beam energies at 8, 12 and 16 keV. The surface roughness of the metallic zinc film increased as ion beam energy increased and was found to act as a crucial factor for the formation of ZnO nanowires by subsequent thermal oxidation. ZnO nanowires with diameters of ∼30 nm...
This article is devoted to presenting results of FDTD (finite difference time domain) simulation of surface waves excited in planar overdense plasmas, with the emphasis on the effect of the corrugated dielectric-plate surface on the excited wave field profile. Computation has been made for different conditions of electron density and coupling structure. We found that fields computed under corrugated...
Organic light-emitting diode-zinc oxide (OLED–ZnO) hybrid nanomaterials are successfully prepared by the incorporation of ZnO (a few weight percent) under simple and mild reaction conditions. Three different types of organic light-emitting materials, Fluorescein, Tris(8-hydroxyquinoline) aluminum, and poly(fluoresceinyl terephthalyl benzoate-co-bisphenol A terephthalate) are chosen to prepare the...
Metal nanocluster composite glass was formed by Cu ion implantation into silica using metal vapor vacuum arc (MEVVA) ion source. The microstructural properties of the nanoclusters were analyzed by optical absorption spectra and transmission electron microscopy (TEM). Third-order nonlinear optical properties of the nanoclusters were measured at 1064nm excitations using Z-scan technique. The nonlinear...
In high vacuum systems or materials that have fine capillaries, the molecular transport can be characterized as being free-molecular flow regime. In this flow regime intermolecular interactions can be ignored and flow is determined entirely by molecule–surface collisions. The transport of gases and volatile compounds through porous media and filters with variety of geometries is of great interest...
Nickel ferrite NiFe 2 O 4 (NFO) thin films have been prepared on a Si substrate (NFO/Si) and La 0.7 Sr 0.3 MnO 3 (LSMO)-coated Si (100) substrate (NFO/LSMO/Si) by RF magnetron sputtering. The microstructures and magnetic properties of the two films were systematically investigated. X-ray diffraction (XRD) and atomic force microscopy (AFM) revealed that highly...
High-quality Cd 1−x Mn x Te polycrystalline films with (1 1 1) preferred orientation were deposited by close-spaced sublimation (CSS) method. The XRD and optical absorption analysis indicated that the band gap of the film was about 1.6 eV. The as-grown Cd 1−x Mn x Te films exhibit quite low photovoltaic performance when used to make cells with CdS as the hetero-junction...
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