Effect of Annealing Temperature and Spin Coating Speed on Mn-Doped ZnS Nanocrystals Thin Film by Spin Coating

Abstract

ZnS:Mn nanocrystals thin film was fabricated at 300°C and 500°C via the spin coating method. Its sol-gel was spin coated for 20 s at 3000 rpm and 4000 rpm with metal tape being used to mold the shape of the thin film. A different combination of these parameters was used to investigate their influences on the fabrication of the film. Optical and structural characterizations have been performed. Optical characterization was analyzed using UV-visible spectroscopy and photoluminescence spectrophotometer while the structural and compositional analysis of films was measured via field emission scanning electron microscopy and energy dispersive X-ray. From UV-vis spectra, the wavelength of the ZnS:Mn was 250 nm and the band gap was within the range 4.43 eV–4.60 eV. In room temperature PL spectra, there were two emission peaks centered at 460 nm and 590 nm. Under higher annealing temperature and higher speed used in spin coating, an increase of 0.05 eV was observed. It was concluded that the spin coating process is able to synthesize high quality spherical ZnS:Mn nanocrystals. This conventional process can replace other high technology methods due to its synthesis cost.

Piezoelectric Properties of Mg Doped ZnO Thin Film using Sol-Gel Method and Spin Coating

“…Theoretically, the thin film produced will become thinner when spin speed increases during coating and leads to higher transparency. The transmittance value of 86 and 96% for both 52500 and 53000 indicates that both films could be used in solar cells as transparent conducting oxide electrodes, which is similar to the previous study [5].…”

“…The results also show that the bandgap energy of thin films increases with increasing spin speed. The film thickness depends on the spin rate as the spin rate of spin coating increases, the thinner the thickness of the film would be produced due to the fluid of sol-gel spins off rapidly at the substrate surfaces [5]. The rapid evaporation of spin coating would induced the lattice strain in grown crystal and also brought to the kinetically driven metastable state phase making the orientation of molecular suitable for charge transport [6].…”

Effect of Optical and Morphological Control of Single-Structured LEC Device

“…We draw attention to the fact that the luminance and spectrum intensity of Figure 4 b and c show relatively high values at a heat treatment temperature of 100 °C. According to other research, the intensity of the thin film decreases as the heat treatment temperature increases [ 30 ]. However, since we controlled the heat treatment temperature in intervals of 20 °C, the intensity of the thin film would not have changed significantly.…”

Effects of Biopolymer Surfactants on the Morphology and Optical Properties of Zinc Sulphide (ZnS) Nanocrystalline Thin Film

“…[4][5][6][7][8] Meanwhile, there are several different thin film deposition techniques such as spin coating, dip coating, chemical bath deposition, chemical spray pyrolysis and microwave irradiation. 1,5,[9][10][11] One of the greatest challenges in synthesising nanoparticles is attaining a precise control for the nanoparticle size and the morphology of the resultant thin films, as most nanostructures will undergo aggregation and agglomeration. 12,13 In recent years, tremendous efforts have been focused on using the surfactants like cetyltrimethylammonium bromide (CTAB), Triton x-100, cetyltrimethylammonium chloride (CTAC), polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA) and polyethylene glycol (PEG) for tailoring the morphology of the thin films.…”