This work reports a study of the room-temperature synthesis of a SnO 2 /ZnO bilayer by magnetron sputtering. Morphological, optical, and electrical properties of the bilayer were investigated for different thicknesses of SnO 2 . Morphology was studied using profilometry and field emission scanning electron microscopy. The optical transmittances of the ZnO films and of the SnO 2 /ZnO combination were high (about 80%) in the visible, and the SnO 2 film did not alter the optical properties of the ZnO, which would act as a transparent contact electrode in a perovskite solar cell.