High Performance Inverted Planar MAPbI₃ Perovskite Solar Cells with a Simple Annealing Process

Abstract Here we report a simple and fast annealing method to prepare MAPbI₃ perovskite active film for an inverted planar solar cell. The annealing process includes suspended annealing followed by contact annealing; the optimized annealing temperature is 90 °C. The MAPbI₃ perovskite film shows improved crystallization and larger grain size after annealing at 90 °C. Furthermore, the MAPbI₃ perovskite cell electrode deposition and efficiency test are performed in ambient air, and a high PCE of 17.12% are achieved when the annealing temperature is 90 °C. The results indicate that a high efficiency MAPbI₃ perovskite solar cell can be realized by a simple annealing process with convenient equipment requirements.