In this research, the dendritic Silver sulfide nanostructures were successfully synthesized by a simple hydrothermal route. The effect of temperature, and reaction time, on the morphology and particle dimension was also investigated. Thus, the efficiency of synthesized Silver sulfide nanostructures in thin-film solar cells was evaluated. The results indicated very well that the particle dimension and morphology have effect on solar cells efficiency and dendritic Silver sulfide nano- structures have higher efficiency compared to spherical and rod-like Silver sulfide nanostructures. Moreover, depositing of dendritic Silver sulfide upon Silver sulfide nanoparticles led to obtaining 3.17% cell efficiency that in comparison with sole dendritic nanostructures and sole nanoparticles (1.81%), efficiency improvements of 48 and 85% were, respectively, obtained.