Structural, opto-electronics and magnetic study of Fe/Si doped ZnO
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Structural, opto-electronics and magnetic hysteresis properties have been studied of sol–gel synthesized Zn(0.96875)Si(0.03125)-xFexO (0 ≤ x ≤ 0.03125) nano-particles. The crystallites belong to a wurtzite P63mc space group. The ratio of Si:Fe is varied in these materials. Si4+ and Fe3+ both attract oxygen to the lattice. The excess oxygen content reduces oxygen vacancies and further creates oxygen interstitials. However, there is a limit of oxygen intake as space is used up when a larger Fe3+ ion substitutes a smaller Si4+ ion. Hence, with increasing Fe3+ content the amount of oxygen added to the lattice starts reducing firstly, due to the lesser charge and secondly due to the larger size of Fe3+. This trend results in optimized maxima of oxygen content and affects the lattice parameters, lattice strain, defect states thereby tuning bandgap and photoluminescent properties. Excluding the pure ZnO sample, all samples exhibit weak ferromagnetic interactions that enhance with increasing Fe content.
Authors thank Dr. Vipul Singh at IIT, Indore, for providing Photoluminescence Spectroscopy. We also thank Sophisticated Instrumentation Center (SIC), IIT Indore for Scanning Electron Microscopy and IIT Indore for funding the project. One of the authors (Dr. Sajal Biring) acknowledges financial support from the Ministry of Science and Technology (Grant Nos. 106-2221-E-131-027 and 107-2221-E-131 -029 -MY2). Dr. Kaushik Ghosh is thankful to DST, India for financial support under Nanomission (SR/NM/NS-91/2016) research funding scheme.
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There are no conflicts of interest to declare.
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