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Structural, Optical, and Magnetic Properties of Solution-Processed Co-Doped ZnS Thin Films

Abstract

Co-doped ZnS thin films have been grown on glass substrates using solution-processing and dip-coating techniques, and the impact of the Co doping level (0% to 5%) and film thickness on certain characteristics examined. X-ray diffraction study revealed that all the films possessed hexagonal crystal structure. Energy-dispersive x-ray analysis confirmed presence of Zn, Co, and S in the samples. Scanning electron microscopy showed that the film surface was homogeneous and dense with some cracks and spots. X-ray photoelectron spectroscopy confirmed introduction and integration of Co2+ ions into the ZnS thin films. Compared with undoped ZnS, optical studies indicated a reduction in optical bandgap energy (E g) while the refractive index (n), extinction coefficient (k), and dielectric constants (ε 1, ε 2) increased with film thickness (t) and Co doping level (except for 5%). Photoluminescence spectra showed enhanced luminescence intensity as the Co concentration was increased, while the dependence on t showed an initial increase followed by a decrease. The origin of the observed low-temperature (5 K and 100 K) ferromagnetic order may be related to point defects such as zinc vacancies, zinc interstitials, and sulfide vacancies or to the grain-boundary effect.

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Goktas, A., Mutlu, İ. Structural, Optical, and Magnetic Properties of Solution-Processed Co-Doped ZnS Thin Films. J. Electron. Mater. 45, 5709–5720 (2016). https://doi.org/10.1007/s11664-016-4771-3

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  • DOI: https://doi.org/10.1007/s11664-016-4771-3

Keywords

  • Co-doped ZnS
  • solution processing
  • photoluminescence
  • refractive index
  • dielectric constant
  • paramagnetic/ferromagnetic behavior