Document Type : Original Article

Authors

1 Department of Industrial Physics, Enugu State University of Science and Technology, Agbani, Enugu State, Nigeria

2 Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan

3 Department of Science Laboratory Technology, Delta State Polytechnic, Ogwashi – Uku, Delta State, Nigeria

4 Shenzhen Institutes of Advanced Technology, CAS, Shenzhen, 518055, China

5 Department of Industrial Physics, Chukwuemeka Odumegwu Ojukwu University Uli, Anambra State, Nigeria

6 Department of Computer Science Education, Madonna University Nigeria, Okija Campus, Anambra State, Nigeria

Abstract

Thin films of antimony-doped zinc telluride (Sb:ZnTe) were produced using an electrodeposition method. The examination included both the structural and optical characteristics, as well as the size of the crystallites. X-ray diffraction (XRD) analysis revealed Sb:ZnTe on Fluorine doped Tin Oxide (FTO) substrates had a hexagonal structure. The crystallite sizes in these thin films vary between 23.88 nm and 33.00 nm with dislocation density within the range of 2.32 to 1.02    and the microstrain between 5.59 and 3.99. UV-Vis spectroscopy revealed the absorbance values of the film decreased, with a range of 33% to 54% as the wavelength increased from 400 nm to 1100 nm. The transmittance and reflectance values of the film varied between 28.50% and 48.0% and less than 20.5%, respectively, suggesting that the deposited thin films are appropriate for use as antireflective coatings in smart window technology. The refractive indices of the films varied between 2.40 and 2.63. The extinction coefficient was found to increase with wavelength across the studied spectrum (400 nm to 1100 nm) and decrease with higher deposition potential. These extinction coefficient values suggest that the films are appropriate for use as absorber layers in thin-film solar cells. A band gap of 2.00 eV was determined at 2.5 volts and as the deposition potential increased, the films showed a decrease in the energy band gap. Gravimetric method analysis revealed that the thickness of antimony doped zinc telluride films increased from 126.18 nm to 378 nm as the deposition potentials increased from 2.5 volts to 4.5 volts. It is critical to control the electrodeposition potential to achieve the desired film thickness and properties.

Graphical Abstract

Effect of deposition potential on the structural and optical properties of electrodeposited antimony doped zinc telluride (Sb:ZnTe) thin films for optoelectronic applications

Keywords

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