n the present study, reduced Graphene Oxide (rGO) was introduced to Titanium Dioxide (TiO2) as Electron Transport Layer (ETL) in Perovskite Solar Cell (PSC). TiO2doped rGO (TiO2/rGO) was prepared by dopingTitanium (IV) Oxide nanopowder as a precursor for TiO2and chemically reduced Graphene Oxide (rGO). The TiO2/rGO wasvaried with different annealing temperature and theeffects of electrical, structural and opticalon TiO2/rGO ofPSC werestudied. The surface morphologies of TiO2/rGO thin films werecharacterized via X-Ray Diffraction (XRD). Meanwhile, Ultraviolet-visible spectroscopy (UV-Vis) wasused to characterize the optical properties of TiO2/rGO thin filmswhilecurrent-voltage (I-V) analysis was measured by using Keithley Sourcemeter. Structural and morphological evidence from XRD results confirmed that the TiO2/rGO samples changes from anatase phase to rutile phaseas the annealing temperature increasedand theaverage crystalline size of TiO2/rGO thin filmschangewith the TiO2crystalline phase accordingly. The annealing temperature of 550°Cexhibits the larger grain size that results in better conductivity, higher light absorptionand lower bandgap energy.