Influence of Bath Temperature and Deposition Time on Topographical and Optical Properties of Nanoparticles ZnS Thin Films Synthesized by a Chemical Bath Deposition Method

Abstract

In this paper, zinc sulfide nanoparticle (ZnS-NP) thin films were deposited onto glass substrates by chemical bath deposition using zinc sulfate as the cation precursor and thiourea as the anionic precursor. Different bath temperatures (65, 70, 75, and 80°C) and different deposition times (20, 30, 40, and 50 min) were selected to study the performance of ZnS thin films. Topographical and optical characterizations of the films were studied using the atomic force microscope (AFM) and UV-Vis spectroscope. The best ZnS thin films were deposited at a bath temperature (70°C) and a deposition time (30 min) with homogeneous distribution, high density, and small average diameter (106 nm). The energy gap (Eg) was found to be in the range of 4.05-3.97 eV for the ZnS films. Optical constants (refractive index, n, extinction coefficient, k, and dielectric constant, ε) of the films were obtained in the wavelength range 300-500 nm by using spectrophotometric measurement. The dispersion of the refractive index is analyzed by using a single oscillator model. The oscillator energy E0 and dispersion energy Ed were determined using the Wemple-DiDomenico single oscillator model. Urbach’s energy increases from 0.907 eV to 2.422 eV with increasing of deposition time. The calculated radius of nanoparticles using Brus equation was 1.9, 2.3, 2.45, and 2.51 nm at deposition times 20, 30, 40, and 50 min, respectively.

The Influence of Bath Temperature on the Properties of SILAR Deposited Cobalt Selenide Thin Films

“…On the other hand, we found that film thickness (1.4 to 1.7µm) increased with increasing temperature. The temperature effect on the film thickness has been reported by many researchers [43,44]. Figure 2 indicates the XRD patterns for the cobalt selenide thin films prepared under various bath temperatures.…”

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“…Many researchers reported that more and more big particles appeared as the deposition time was increased. Further, they explain that the growth of particles (same deposition temperature) strongly depended onto longer deposition time [46][47][48][49][50].…”

Annealing Effect on the Structure and Optical Properties of CBD-ZnS Thin Films for Windscreen Coating

“…For the deposition of ZnS thin films via CBD, some factors should be considered and controlled. These factors include Zn precursor, S precursor, complexing agent, pH of the mixture, bath temperature, and deposition time [30][31][32][33][34][35].…”