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Journal of Electronic Materials

, Volume 45, Issue 11, pp 5709–5720 | Cite as

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

  • A. GoktasEmail author
  • İ.H. Mutlu
Article

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.

Keywords

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

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Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  1. 1.Department of Physics, Faculty of Arts and SciencesHarran UniversitySanliurfaTurkey
  2. 2.Department of Physics and Materials, Interdisciplinary Faculty of Science and EngineeringShimane UniversityMatsueJapan
  3. 3.Department of Materials Science and EngineeringAkdeniz UniversityAntalyaTurkey

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