Inverted planar NH2CH=NH2PbI3 perovskite solar cells with 13.56% efficiency via low temperature processing

In this work, NH2CH=NH2PbI3 (FAPbI(3)) 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 degrees C. The effect of the annealing process on device performance was investigated. The FAPbI(3) solar cells based on a slowed-down annealing shows superior performance compared to the CH3NH3PbI3 (MAPbI(3))-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 FAPbI(3) perovskite solar cells.