Enhanced electrical conductivity and charge conduction mechanisms in Nano-cubical Sunset Yellow dye incorporated with titanium dioxide nanoparticles

Abstract

This manuscript focuses on the investigation of the effect of titanium dioxide nanoparticles doping on the electrical conductivity of Nano-cubical Sunset Yellow Dye. The successful preparation of the composite was confirmed through XRD analysis, and EDX analysis verified the composite's composition. DC conductivity measurements revealed two conduction mechanisms with activation energies of 0.683 eV and 0.466 eV for the dye without NPs at low and high-temperature regions, respectively, and 0.532 eV and 0.351 eV for the same regions in the presence of NPs. AC conductivity analysis showed single polaron hopping as the dominant charge conduction mechanism for both devices. The device with the dye-NP composite exhibited lower activation energy and improved conductivity compared to the dye-only device. The composite also displayed a higher density of localized states, and by incorporation of NPs reduced the hopping length, contributing to the enhanced conductivity of the composite device.