Reduced\nGraphene Oxide/Mesoporous TiO₂ Nanocomposite Based Perovskite\nSolar Cells

Abstract

We report on reduced graphene oxide\n(rGO)/mesoporous (mp)-TiO₂ nanocomposite based mesostructured\nperovskite solar cells that show an improved electron transport property\nowing to the reduced interfacial resistance. The amount of rGO added\nto the TiO₂ nanoparticles electron transport layer was\noptimized, and their impacts on film resistivity, electron diffusion,\nrecombination time, and photovoltaic performance were investigated.\nThe rGO/mp-TiO₂ nanocomposite film reduces interfacial\nresistance when compared to the mp-TiO₂ film, and hence,\nit improves charge collection efficiency. This effect significantly\nincreases the short circuit current density and open circuit voltage.\nThe rGO/mp-TiO₂ nanocomposite film with an optimal rGO\ncontent of 0.4 vol % shows 18% higher photon conversion efficiency\ncompared with the TiO₂ nanoparticles based perovskite solar\ncells.