Solid-state electronics

Zinc selenide films have been deposited on glass substrate by chemical bath deposition method. The resultant films were annealed up to 473 K temperature. The structural properties of zinc selenide thin films have been investigated by X-ray diffraction techniques. The X-ray diffraction spectra showed that zinc selenide thin films are polycrystalline and have a cubic structure. The most preferential orientation is along the (111) direction for all films. The lattice parameter, grain size, and microstrain were calculated and correlated with annealing temperature. The optical properties showed direct band gap values were found to be in the region of 2.69–2.81 eV. The electrical studies shows conductivity increases with increase in annealing temperature. The optoelectric and structural data are discussed from the point of applications based on achieving high performance devices.

Effect of thermal annealing on properties of zinc selenide thin films deposited by chemical bath deposition

Effect of Nb doping on structural, electrical and optical properties of spray deposited SnO2 thin films

Thin films of tin oxide (SnO2) have been grown by using a simple and economical spray pyrolysis technique. The deposition temperature was optimized to 450 °C, while the concentration and quantity of the solution were kept fixed at 2 M and 20 ml, respectively. X-ray diffraction patterns (XRD) studies reveal that the material deposited is polycrystalline SnO2 having primitive tetragonal structure. The lattice parameters, grain size, microstrain and dislocation densities were calculated and correlated with the substrate temperature. The transmission spectra showed a sharp decrease in transmission at the absorption edge and a good form of interference pattern. The figure of merit has been calculated from transmission spectra. Low sheet resistance ∼16.03 Ω/sq cm and high visible transmission (∼86%) were obtained when the films were deposited at the substrate temperature of 450 °C. From electrical measurements, the resistivity was found to be 11.5×10−4 Ω cm, while the carrier concentration was calculated to be 8.81×1021 cm−3.

Studies and correlation among the structural, optical and electrical parameters of spray-deposited tin oxide (SnO2) thin films with different substrate temperatures

We have studied the magnetic behavior of superparamagnetic Fe nanocrystals (4--7 nm in diameter) dispersed in submicron-sized spherical silica particles $(\ensuremath{\sim}150\mathrm{nm}$ in diameter) Spherical composites that could be useful for biomedical applications were prepared by an aerosol-assisted method M\"ossbauer studies have allowed us to determine that the magnetic response of the composites must be the result of a competition between intraparticle anisotropy and interparticle dipolar interactions Evidence of an interacting superparamagnetic (ISP) regime that is characterized by a ${H/M}_{s}$ scaling law of the reduced magnetization isotherms instead the $H/T$ scaling law of the ideal superparamagnetic regime has been found in the composites The ISP regime, as recently reported in similar nanostructured systems, appears as an intermediate regime, separating the high-temperature, conventional superparamagnetic regime from the low-temperature, blocked-particle regime We have also found that the normalized values of ${M}_{s}$ at room temperature are function of the Fe metallic particle size Finally, we have found that the magnetic anisotropy constant of superparamagnetic Fe nanoparticles depend on the nature of their coating shell

Magnetic behavior of superparamagnetic Fe nanocrystals confined inside submicron-sized spherical silica particles

ZnSe thin films have been deposited on high cleaned glass substrate by spray 
pyrolysis technique within the glass substrate temperature range (400 ○C 
to 450 ○C). The structural properties of ZnSe thin films have been 
investigated by (XRD) X-ray diffraction techniques. The X-ray diffraction 
spectra showed that ZnSe thin films are polycrystalline and have a cubic 
(zinc blende) structure. The most preferential orientation is along the 
(111) direction for all spray deposited ZnSe films together with 
orientations in the (220) and (311) planes also being abundant. The film 
thickness was determined by an interferometric method. The lattice 
parameter, grain size, microstrain and dislocation densities were calculated 
and correlated with the substrate temperature (TS). The optical 
properties of ZnSe thin films have been investigated by UV/VIS spectrometer 
and the direct band gap values were found to be in the region of 2.65 eV to 
2.70 eV. The electrical properties of ZnSe thin films have been investigated 
using the Van der Pauw method and the high quality ZnSe thin films were 
observed to develop at 430 ○C with a resistivity of 56,4×105 ohm cm, a conductivity of 1.77×10-7 (Ω cm)-1 and a hall 
mobility of 0.53 cm2/Vsec.

Investigations on structural, optical and electrical parameters of spray deposited ZnSe thin films with different substrate temperature

The effect of Zn:Se ratio on the photoconducting properties of ZnSe thin films has been studied. The ZnSe thin films have been deposited onto glass substrates by the spray pyrolysis method, the substrate temperature kept at 430◦C using mixed aqueous solutions of ZnCl2 and SeO2 with different Zn:Se ratios. Their electrical, structural, and photoconductivity properties have been studied. The values of optical bandgap have been determined from the absorption spectra.

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Ö.F. Bakkaloglu

Papers

Investigations on structural, optical and electrical parameters of spray deposited ZnSe thin films with different substrate temperature

Effect of Zn:Se Ratio on the Properties of Sprayed ZnSe Thin Films

Magnetic studies on electrodeposited Cu1−xCox alloy films

A magnetic study of sputtered Fe/Cu multilayer films

Magnetic hyperfine fields in Fe/Co and Fe/Cu multilayers