Encapsulation of UV Glue, Hydrophobicity of Binder and Carbon Electrode Enhance the Stability of Organic-Inorganic Hybrid Perovskite Solar Cells up to 5 Years

The long-term stability of organic-inorganic hybrid perovskite (OIHP) is very important for its industrial application. However, how long the encapsulated perovskite can remain stable under ambient conditions is completely unclear. Herein, the performance and stability of OIHP after 5 years under ambient conditions us investigated. The result of UV-vis absorption spectra shows that encapsulating device by UV glue can retain the absorption characteristics and color of CH(3)NH(3)PbI(3)perovskite after 5 years. In addition, the results of contact angle and immersing in water indicate that the hydrophobic effect of graphite/conductive carbon and tetrafluoroethylene polymer binders can prevent the invasion of external water and air. The photoelectrochemical results show that the performance of the resistance, built-in potential, and power conversion efficiency of the devices after 5 years can be comparable with that of initial devices. Finally, cross-sectional scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) demonstrate that CH3NH3PbI3/TiO(2)heterojunction still exists in the perovskite solar cells after 5 years.