Hyperfine splitting and ferromagnetism in CdS:Mn nanoparticles for optoelectronic device applications  

作　　者：Madhavi Sharad Darekar Praveen Beekanahalli Mokshanatha 

机构地区：[1]Department of Physics,Institute of Engineering and Technology,Srinivas University,Mukka,Surathkal,Mangalor-e574146,Karnataka,India

出　　处：《Journal of Semiconductors》2023年第12期89-103,共15页半导体学报（英文版）

摘　　要：Manganese(Mn)doped cadmium sulphide(Cd S)nanoparticles were synthesized using a chemical method.It was possible to decrease Cd S:Mn particle size by increasing Mn concentration.Investigation techniques such as ultraviolet-visible(UV-Vis)absorption spectroscopy and photoluminescence(PL)spectroscopy were used to determine optical properties of Cd S:Mn nanoparticles.Size quantization effect was observed in UV-Vis absorption spectra.Quantum efficiency for luminescence or the internal magnetic field strength was increased by doping Cd S nanoparticles with Mn element.Orange emission was observed at wavelength~630 nm due to ^(4)T_1→^(6)A_1 transition.Isolated Mn~(2+)ions arranged in tetrahedral coordination are mainly responsible for luminescence.Luminescence quenching and the effect of Mn doping on hyperfine interactions in the case of Cd S nanoparticles were also discussed.The corresponding weight percentage of Mn element actually incorporated in doping process was determined by atomic absorption spectroscopy(AAS).Crystallinity was checked and the average size of nanoparticles was estimated using the X-ray diffraction(XRD)technique.Cd S:Mn nanoparticles show ferromagnetism at room temperature.Transmission electron microscopy(TEM)images show spherical clusters of various sizes and selected area electron diffraction(SAED)patterns show the polycrystalline nature of the clusters.The electronic states of diluted magnetic semiconductors(DMS)ofⅡ-Ⅵgroup Cd S nanoparticles give them great potential for applications due to quantum confinement.In this study,experimental results and discussions on these aspects have been given.

关 键 词：SYNTHESIS characterization undoped CdS nanoparticles Mn-doped CdS nanoparticles non-aqueous chemical method 

分 类 号：TN36[电子电信—物理电子学]