Effect of impurity concentration on optical and magnetic properties in ZnS:Cu nanoparticles |
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| Institution: | 1. Lomonosov Moscow State University, Moscow 119991, Russia;2. P.N. Lebedev Physical Institute RAS, Moscow 119991, Russia;1. Department of Physics, Zhejiang Normal University, Jinhua 321004, China;2. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China;3. College of Science, Shanghai Institute of Technology, Shanghai 200235, China;1. Key Laboratory of Transparent and Opto-functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Department of Physics, Shanghai Normal University, Shanghai, 200234, China |
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| Abstract: | To obtain enhanced room temperature ferromagnetism (RTFM) along with the increase in optical bandgap in the compound semiconductors has been an interesting topic. Here, we report RTFM along with increase in energy bandgap in chemically synthesized Zn1?xCuxS (0 ≤ x ≤ 0.04) DMS nanoparticles. Structural properties of the synthesized samples studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show the formation of cubic phase Cu doped ZnS nanoparticles of ~3–5 nm size. An intrinsic weak ferromagnetic behavior was observed in pure ZnS sample (at 300 K) which got increased in Cu doped samples and was understood due to defect induced ferromagnetism. UV–vis measurement showed increase in the energy bandgap with the increase in Cu doping. The PL study suggested the presence of sulfur and zinc vacancies and surface defects which were understood contributing to the intrinsic FM behavior. |
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| Keywords: | Diluted Magnetic Semiconductor Nanocrystallites Bandgap increase Intrinsic RTFM |
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