Inverted planar NH2CHNH2PbI3 perovskite solar cells with 13.56% efficiency via low temperature processing

Abstract

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.