Adopting DC reactive magnetron sputtering technique, Pbo film was fabricated on FTO-glass substrate coated with a nanocrystalline ruble titania (NRT) by using a pure metallic lead target in an Ar/O-2 mixture. Then the as prepared PbO film was converted to CH3NH3PbI3 through the sequential reactions occurred in isopropanol solution of CH3NH3I. The as -prepared perovskite film exhibits a surface morphology of high uniformity and good coverage over a large scale; the crystal grains reach the size of up to 600 nm, which is beneficial for enhancing light absorption and decreasing grain boundary. The solar cells with a structure of FTO/NRT/CH3NH3PbI3/Spiro-MeOTAD/Au were fabricated, where NRT was employed as the contact layer of the photovoltaic devices. Our champion cells with active area of 0.09 cm(2) and 1.07 cm(2) achieve the highest power conversion efficiency of 14.1% and 10.7%, respectively, under the standard AM 1.5 conditions. The present approach is competent for the fabrication of large area perovskite solar cells with the advantages of easy control, cost-saving, and less use of toxic reagents, and thus with potential applications.