Rejuvenation of perovskite solar cells

A novel method has been developed to recharge and rejuvenate perovskite solar cells by immersing the device into methyl ammonium iodide (MAI) solution and heating at 70 °C for 40 s. We demonstrated that Au electrodes are more robust than Al and Ag electrodes for ZnO planar structures rather than ZnO and TiO 2 nanoparticles (NPs). In addition to this, the degradation mechanism of the device has been discussed. The scanning electron microscopy (SEM) images and X-ray diffraction (XRD) spectroscopy are evidence that the perovskite crystals have been regenerated after degradation (60 days) with the help of MAI as a rejuvenating agent. After long-term aging tests with rejuvenation in 185 days, its PCE value is still around 11% compared to the original one of 11.6%.