Abstract
Non-stoichiometric ZnS1−x:Mnx nanomaterials were prepared using a thermolysis procedure by decreasing the stoichiometric amount of thiourea relative to the amount of zinc acetate as starting precursors: Zn(Ac)/(1−x) thiourea in the presence of (x) manganese acetate (x = 0, 0.01, 0.03, 0.05, and 0.1). Rietveld X-ray diffraction analysis was used to examine the structural modification in the ZnS lattice induced by sulfur deficiency and Mn2+ incorporation. The samples with x ≤ 0.01 exhibited a single ZnS zincblende phase, while other samples, x ≥ 0.02, have two phases ZnS and ZnO with different percentages. The lattice parameter of the system is governed by the Mn and S amounts in the matrix. A high-resolution transmission electron microscope established the quantum dot nature of the system. Fourier-transform infrared technique confirmed the presence of ZnS and ZnO phases in higher Mn-doped ZnS samples. The bandgap obtained from UV–vis analysis showed non-monotonic dependence on Mn content; it initially decreased and then increased to form a bandgap “bowing.” Photoluminescence analysis revealed that the emission colors depended on the amount of Mn doping in the matrix. The PL intensity raised for all Mn-doped samples as compared with the pristine sample reached its maximum value for the 3% and 5% Mn samples. The PL exhibited a red shift for the high dopant amount of Mn. Density function theory calculation was used to explore the electronic and optical characteristics of pure phases in ZnS1−xMnx system.
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The authors are grateful to the Deanship of Scientific Research, King Saud University for funding through Vice Deanship of Scientific Research Chairs.
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Heiba, Z.K., Mohamed, M.B., Ahmed, S.I. et al. Structural, optical, and electronic properties of non-stoichiometric nano-ZnS1−x: Mnx. J Mater Sci: Mater Electron 31, 13447–13459 (2020). https://doi.org/10.1007/s10854-020-03898-3
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DOI: https://doi.org/10.1007/s10854-020-03898-3