Structural and Optical Dispersion Characterisation of Sprayed Nickel Oxide Thin Films

Abstract

Crystalline and non-crystalline nickel oxide (NiO) thin films were obtained by spray pyrolysis technique (SPT) using nickel acetate tetrahydrate solutions onto glass substrates at different temperatures from 225 to 350℃. Structure of the as-deposited NiO thin films have been examined by X-ray diffraction (XRD) and atomic force microscope (AFM). The results showed that an amorphous structure of the films at low substrate temperature (T<sub>s</sub> = 225℃), while at higher T<sub>s</sub> ≥ 275℃, a cubic single phase structure of NiO film is formed. The refractive index (n) and the extinction coefficient (k) have been calculated from the corrected transmittance and reflectance measurements over the spectral range from 250 to 2400 nm. Some of the optical absorption parameters, such as optical dispersion energies, <i>E<sub>o</sub></i> and <i>E<sub>d</sub></i>, dielectric constant, <i>ε</i>, the average values of oscillator strength, <i>S<sub>o</sub></i>, wavelength of single oscillator <i>λ<sub>o</sub></i> and plasma frequency, <i>ω<sub>p</sub></i>, have been evaluated

Influence of precursor molar concentration on the structural, morphological, optical and electrical properties of PbS thin films deposited by spray pyrolysis technique using perfume atomizer

“…In this paper, we report the effects of precursor molar concentration on the structural, morphological, optical and electrical properties of PbS films grown on glass substrates by the simplified spray pyrolysis method. Accurate determination of the optical constants of PbS films is important, not only in order to know the basic mechanisms Page 4 of 27 A c c e p t e d M a n u s c r i p t underlying these phenomena, but also to exploit and develop their interesting technological applications [12]. Therefore, the optical absorption parameters, such as optical dispersion energies, E o and E d , the average value of oscillator strength S o , wavelength of single oscillator λ o , have been evaluated under the effect of S:Pb molar concentrations.…”

Spray Pyrolysis Deposition and Effect of Annealing Temperature on Optical Properties of Cu:NiO Film

“…Several physical and chemical methods, such as sputtering [11], pulsed laser deposition [12], chemical bath deposition [11][12][13] and sol-gel [14] have been used to obtain nickel oxide films. All the NiO thin film prepared methods offer different advantages depending on the application of interest and many efforts have been conducted to obtain films with the desirable physical and/or chemical properties [15].…”

Effect of Ta concentration on the refractive index of TiO2:Ta studied by spectroscopic ellipsometry

“…2 Optical properties are important parameter for application in the integrated optical devices such as filters, modulators, and switches, where refractive index parameter and band gap are the key role for device design due to the fact that it is closely related to the electronic polarization. 3 For undoped TiO 2 , Landmand et al 4 reported that both of refractive index and extinction coefficient at 550 nm are 2.56 and 1.9 10…”

“…Optical dispersion describe spectral dependencies on the dielectric constant, plasma frequency, dispersion energy, and band gap of the films. 3 These properties provide us information concerning microscopic characteristic of the film.…”