Study on the structural, optical and magnetic properties of cobalt-doped CdSSe quantum dots
Abstract
Co-doped CdSSe alloy quantum dots (QDs) were successfully synthesized via a wet chemical hot-injection method, with Co2+ doping concentrations ranging from 1 to 10% at. In addition to the intrinsic band gap tunability of CdSSe QDs, Co incorporation introduces magnetic functionality, enabling the development of diluted magnetic semiconductor nanostructures for optoelectronic and spintronic applications. The effects of sulfur/selenium ratio and cobalt doping on the structural, optical, photoluminescence, and magnetic properties of CdSSe QDs were systematically investigated. X-ray diffraction results confirm that both undoped and Co-doped CdSSe QDs crystallize in the cubic zinc blende structure, with no secondary phases detected. The lattice constant decreases with increasing Co concentration due to the substitution of smaller Co2+ ions for Cd2+ ions in the host lattice. Optical absorption and photoluminescence measurements reveal that the emission wavelength of CdSxSe1−x QDs can be effectively tuned across the visible region by adjusting the S/Se ratio. Upon Co2+ doping, a pronounced blue shift of both absorption and photoluminescence peaks is observed, accompanied by an increase in band gap energy, indicating strong modification of the electronic structure induced by Co-related energy levels. This behavior is attributed to the substitution of Cd2+ by smaller Co2+ ions, which induces compressive lattice strain and shifts the conduction band edge to higher energy. Time-resolved…
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