Structural, optical, and electronic characteristics of non-stoichiometric nanocadmium sulfide

Abstract

Samples of non-stoichiometric nano CdS 1 − x were synthesized by a simple thermolysis method by lowering the ratio of thiourea relative to cadmium acetate as starting precursors; Cd(Ac):(1-x) thiourea (x = 0.0, 0.03, 0.05 and 0.1). X'pert HighScore Plus program manifested biphasic CdS (cubic and hexagonal) and the Rietveld analysis was utilized to match the structural and microstructure parameters of the formed samples. The possibility of formed CdS 1 − x O x alloy due to the sulfur de ciency is also examined using the Rietveld method. A High-resolution transmission electron microscope imaging exhibited nano size particles with homogeneous morphology. Fourier transform infrared spectrometer was utilized to con rm the existence of O 2 in CdS 1 − x matrix. The bandgap energies for CdS 1 − x are reduced below the values of energy gaps of CdS and CdO upon increasing the parameter (x) forming a band gap "bowing".The photoluminescence (PL) emitted visible colors depending on the amount of sulfur de ciency and excitation wavelength used. The maximum PL intensity observed in CdS 0.9 sample, con rmed the presents of oxygen inside the matrix. The in uence of oxygen substitution or vacancies of sulfur on the electronic structure and optical features of CdS was also investigated applying density function calculations.

Impact of Cobalt-Doping on the Optical, Magnetic, and Electronic Features of Hexagonal Cadmium Sulfide

“…4,7 CdS as a DMS nanomaterial has wide applications in spintronics, solarenergy conversion, non-linear optics, and chemical cells in photoelectron and photochemical. 8 Saikia et al, 7 presented an experimental and theoretical exploration of room temperature ferromagnetism of Fe-doped CdS nanoparticles arising from spin polarization induced by the presence of Fe atoms. Cobalt ion is a crucial dopant due to its substantial magnetic moment (1.6−1.7 μ B ), which induces spin polarization and leads to the development of ferromagnetism in CdS.…”