Transparent crystalline nanostructured nickel oxide (NiO) thin films were prepared using a simple spray pyrolysis technique from hydrated nickel chloride salt solution (NiCl 2 Á6H 2 O) onto glass and silicon (n-type) substrates at different temperatures (280, 320, 360, and 400°C) and with different solution concentrations (0.025, 0.05, 0.075, and 0.1 M). Structural and morphological properties of the grown NiO films were studied using X-ray diffraction (XRD) and atomic force microscope. Optical properties and chemical analysis of the films were characterized by UV-visible absorption spectra and Fourier transform infrared spectroscopy, respectively. The XRD result showed that the deposited film has an amorphous structure when deposited at temperature of T s = 280°C and concentration of 0.025 M. At higher temperatures (T s = 320, 360, 400°C) and solution concentrations (0.05, 0.075, 0.1 M), the deposited films have cubic polycrystalline structure formed with preferred orientation along (111) plane. The band gap of NiO film increases from 3.4 to 3.8 eV as the molarity decreased from 0.1 to 0.05 M.

ABSTRACT. In this paper, nanostructured cadmium oxide films were prepared by chemical spray pyrolysis technique.The structural, morphological and optical characteristics of synthesized films are investigated as function of concentration .AFM results revealed that the root mean square of surface roughness is increased with cadmium concentration. XRD investigation confirmed that the films are polycrystalline with cubic structure. SEM study displayed that the synthesized films have particle size in the range of 25-100nm depending on cadmium ion concentration. The optical properties revealed the films have maximum average optical transmittance of 78% for film sprayed with 0.1 M. The optical band gap of the CdO film prepared with 0.25 M was 2.65eV. The optical band gap increased as the film molarity .

We report on fabrication and characterization of SnO 2 -Si n-n made by deposition of SnO 2 film onto monocrystalline silicon substrate by rapid photothermal oxidation (RPO) of Sn with condition 500 • C/120 s. The film has been characterized by techniques such as XRD, optical transmission, and Hall effect. The XRD spectrum showed that the grown SnO 2 was polycrystalline in nature with tetragonal crystal structure. From optical transmittance data the band gap of SnO 2 film was calculated and found to be 3.9 eV. The electrical measurement revealed that the SnO 2 film was n-type. Current-voltage (I-V) and capacitance-voltage (C-V) characteristics of SnO 2 -Si heterojunction were investigated. The ideality factor of junction estimated from I-V characteristics was 1.8 at 300 K. The spectral responsivity of heterojunction having two peaks of response located at 650 nm and 850 nm.

In this paper, nanostructured cadmium oxide films were prepared by chemical spray pyrolysis technique.The structural, morphological and optical characteristics of synthesized films are investigated as function of concentration .AFM results revealed that the root mean square of surface roughness is increased with cadmium concentration. XRD investigation confirmed that the films are polycrystalline with cubic structure. SEM study displayed that the synthesized films have particle size in the range of 25-100nm depending on cadmium ion concentration. The optical properties revealed the films have maximum average optical transmittance of 78% for film sprayed with 0.1 M. The optical band gap of the CdO film prepared with 0.25 M was 2.65eV. The optical band gap increased as the film molarity.