Optical analysis, optical limiting and electrical properties of novel PbI₂/PVA polymeric nanocomposite films for electronic optoelectronic applications

This paper studied the influence of changing the lead iodide (PbI₂), concentration in the PVA matrix through the structural, optical and electric measurements. Nanocomposite films have been defined by X-ray diffraction and FT-IR spectrometer which reveal the interaction between PVA and PbI₂. The interplanar distance, particle size, and the average inter-crystalline separation were calculated. The optical properties of PbI₂/PVA composites have been examined. PVA optical band gap was reduced from 5 to 3.49 in indirect transition and from 5.48 to 4.88 indirect transition to cause an increase in optical conductivity. Dielectric constant, ϵ₂ and dielectric loss, ϵ₂ and electrical conductivity, σ is increased with increasing PbI₂ concentrations. So, the electrical conductivity σ can be controlled by the PbI₂ doping percentage. PbI₂/PVA showed laser power attenuation for both He-Ne and solid-state green laser beams. The results indicate that the nanocomposites are highly recommended in optoelectronic, radiation detection and many other applications.