Effect of Ag2 S nanoparticles on optical, photophysical and electrical properties of P3HT thin films.

Abstract

In the present work, optical, electrical and photophysical properties of poly(3-hexylthiophen)/silver sulphide (P3HT/Ag2 S) nanocomposites thin films were investigated. New amorphous dispersion formula was used to fit the experimental ellipsometer data and observed that the both refractive index (n) and absorption index (k) increases for hybrid films in compare with pure P3HT film. The photophysical properties of fabricated films were examined by recording the photoluminescence (PL) and time resolved fluorescence spectra. The PL quenching in hybrid films signaling the formation of charge transfer complex between host (P3HT) and guest (Ag2 S). The fluorescence average life time was noted to be drops to 94 ps for hybrid P3HT:Ag2 S 1:2 film in compare to 126 ps for pristine P3HT. Finally, the electrical properties of fabricated films were measured from Hall Effect systems and surface resistivity (ρ) of pure P3HT thin films was found to be 9.70×104 Ω.cm which slightly decreases for Ag2 S/P3HT hybrid films.