Inverted planar NH2CHNH2PbI3 perovskite solar cells with 13.56% efficiency via low temperature processing†
In this work, NH2CHNH2PbI3 (FAPbI3) was employed for light harvesting in inverted planer perovskite solar cells for the first time. Except for the silver cathode, all layers were solution-processed under or below 140 °C. The effect of the annealing process on device performance was investigated. The FAPbI3 solar cells based on a slowed-down annealing shows superior performance compared to the CH3NH3PbI3 (MAPbI3)-based devices, especially for the short circuit current density. A power conversion efficiency of 13.56% was obtained with high short circuit current density of 21.48 mA cm−2. This work paves the way for low-temperature fabrication of efficient inverted planer structure FAPbI3 perovskite solar cells.