The　electron　transporting　layer　plays　an　important　role　in　charge　extraction　and　transporting　procedure　for　mesoscopic　perovskite　solar　cells.　Herein,　the　TiO2-B　nanoparticles　are　used　as　an　electron　transporting　material　in　perovskite　solar　cells　for　the　first　time　which　achieves　a　high　efficiency　of　18.83%.　Furthermore,　the　effects　of　TiO2-B　electron　transporting　layer　on　the　nature　of　perovskite　adsorption　layer　and　the　photovoltaic　properties　of　devices　are　investigated　in　detail.　As　a　consequence,　the　high　efficiency　can　be　ascribed　to　perovskite　layer　with　a　high　crystallinity,　resulting　in　suppressing　charge　recombination　at　interfaces,　leading　to　favourable　energy　level　alignment　between　perovskite　and　TiO2-B.