Sol-gel Growth of Ni-doped CdS on Glass Substrates: Effect of Spin Coating Speed and Dopant Concentration

(E-pub Ahead of Print)

Author(s): Atefeh Nazari Setayesh*, Hassan Sedghi

Journal Name: Nanoscience & Nanotechnology-Asia

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Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm.

Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results.

Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

Keywords: CdS, thin film, sol-gel, spectroscopic ellipsometry, Ni dopant, spin coating speed

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Article Details

(E-pub Ahead of Print)
DOI: 10.2174/2210681210999200423120817
Price: $95