Abstract
A facile approach involving electrochemical deposition method was utilized to coat ITO substrate with zinc selenide thin films at different rare earth metal (Eu3+, Sm3+ and Gd3+) ions. The characteristics of deposited films were studied in relation with the doped metal ions. The structure of the coating was confirmed to be hexagonal wurtzite in (101) plane by X-ray analysis. The new antistructural modeling shows that the doping of ZnSe lattice by rare earth cations increases the concentration of the surface active centers such as \({\text{Gd}}_{{{\text{Zn}}}}^{\cdot },\,{\text{Eu}}_{{{\text{Zn}}}}^{\cdot },\,{\text{Sm}}_{{{\text{Zn}}}}^{\cdot },\,{\text{and}}\,{\text{V}^{\prime\prime}_{{\text{Zn}}}}\), which are located in the cationic sublattice. XRD data revealed that the average crystallite size of ZnSe and ZnSe:Eu, ZnSe:Sm, and ZnSe:Gd was 63, 54, 47, and 49 nm, respectively. The morphological results by scanning electron microscopy indicate that the spherical-like structure with agglomeration of grains and a slight increase in the particle size. Energy dispersive X-ray, UV–Visible and photoluminescence spectroscopy were used to study the composition and optical properties of the films. A blue-shift was observed in ZnSe thin films. The bandgap energy of undoped ZnSe and ZnSe:Eu, ZnSe:Sm, and ZnSe:Gd were found to be 2.28, 2.44, 2.68 and 2.75 eV, respectively. Among the different coated films, the Gd3+ ion doped ZnSe thin film exhibited a lesser charge transfer resistance of 25.5 Ω as analyzed from the electrochemical impedance measurement. The photoelectrochemical studies reveal that the rate of photoinduced charge carriers was higher in Gd3+ ion doped thin film. The present studies suggested that the Gd3+ ion doped ZnSe thin film can be a promising material for electrochemical device applications.
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Acknowledgements
Dr. P. Prabukanthan would like to acknowledge the financial support of Science & Engineering Research Board (SERB)-Empowerment and equity opportunities for Excellence in Science [EMEQ] program (File No. SB/EMEQ-259/2014), Department of Science and Technology (DST), India.
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Kumar, T.R., Prabukanthan, P., Harichandran, G. et al. Comparative study of structural, optical and electrical properties of electrochemically deposited Eu, Sm and Gd doped ZnSe thin films. J Mater Sci: Mater Electron 29, 5638–5648 (2018). https://doi.org/10.1007/s10854-018-8533-2
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DOI: https://doi.org/10.1007/s10854-018-8533-2