Suppressing Charge Recombination in ZnO-Nanorod-Based Perovskite Solar Cells with Atomic-Layer-Deposition TiO2**Supported by the National Key Basic Research Program of China under Grant Nos 2012CB932903 and 2012CB932904, the Beijing Science and Technology Committee under Grant No Z131100006013003, the National Natural Science Foundation of China under Grant Nos 51372270, 51372272, 21173260, 11474333, 91433205, 51421002 and 91233202, and the Knowledge Innovation Program of

Abstract

ZnO nanorods are passivated with a TiO2 interfacial layer prepared by the atomic layer deposition method and applied in the CH3NH3PbI3 perovskite solar cell, which show a positive effect on the fill factor and power conversion efficiency. With TiO2 interfacial passivation, the charge recombination in the ZnO/CH3NH3PbI3 interface is effectively suppressed and the maximum power conversion efficiency is enhanced from 11.9% to 13.4%.