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CdS and ZnS are important chalcogenides belonging to II-VI binary compound semiconductor which has wide applications in various optoelectronic devices, medical diagnosis and drug delivery system. The present work reports the synthesis of undoped and Cu doped CdS and ZnS nanoparticles by microwave assisted solvothermal method using the aqueous molar solution of cadmium acetate, zinc acetate, copper chloride and sodium sulphide. The structural properties of the as synthesized nanoparticles have been investigated via X-ray diffraction. The XRD spectrum confirms the crystallinity of the synthesized samples. The average crystal size of the nanoparticles was estimated via Scherrer equation and was found to be around 5.64 nm and 5.46 nm for undoped CdS and ZnS respectively and the value gets reduced on doping CdS and ZnS with Cu. The optical properties of the prepared nanoparticles were examined via PL and UV Visible spectra. The optical energy band gap of as synthesized nanoparticles was estimated using UV- Visible spectra via Tauc equation, which was found to be 3.80 eV and 3.70 eV for undoped CdS and ZnS respectively. The report shows the increment of the energy band gap of CdS and ZnS after doping it with Cu. [ABSTRACT FROM AUTHOR]

CdTe is an important II-VI binary compound material which is widely used as photovoltaic applications. In this work pure and Copper doped CdTe nanoparticles have been synthesized. The synthesis has been carried out by microwave assisted method. In this study the doping effect of Cu on the structural and optical properties of CdTe nanoparticles have been discussed. For the synthesis of nanoparticles the chemicals used were cadmium acetate, Tellurium powder, ethylene glycol, hydrazine hydrate and copper chloride. The as synthesized CdTe and Cu doped CdTe nanoparticles were found to be in crystalline phase which has been confirmed by X-ray diffraction (XRD). The average size of the nanocrystallites were calculated by using Debye- Scherrer formula and was found to be around 65 nm for pure CdTe and it reduces to 52 nm after doping of Cu in CdTe. The bandgap of the nanoparticles was calculated using UV-Visible absorption spectra. The result showed that the bandgap values were blue shifted from the bulk one. [ABSTRACT FROM AUTHOR]