Structural, optical and electrical properties of ZnSe semiconductor nanoparticles
Zinc Selenide nanoparticles were synthesized by a microwave irradiation technique at 2.8 GHz using 7N purity Zn and Se powder in stoichiometric ratio as the starting materials. The crystal system and phase was confirmed by powder X-ray diffraction, the crystallite size was calculated using Scherer's formula and found to be ~ 35 nm. Scanning electron microscope (SEM) also used to determine the size and shape of the nanoparticles which shows average particle size ~50 nm in agreement with PXRD and spherical in shape. The fluorescence study of ZnSe nanoparticles has been done and shows that the material is highly fluorescent. The broad emission peak at 401 nm (3.1 eV) has been observed in the fluorescence spectra this value is highly blue shifted towards the lower wavelength from the bulk value, which shows confinement effect. The temperature dependent electrical measurements on the synthesized nanoparticles were carried out. An anomaly in electrical studies was observed near ~ 488 K, which may be due to the glass phase transition. The resistivity of the synthesized nanoparticles was also calculated and found to be ~ >109 Ωcm.