Significant Stability Enhancement of Perovskite Solar Cells by Facile Adhesive Encapsulation

The long-term stability of organic–inorganic hybrid halide perovskite solar cells (PSCs) is one of the major concerns for future commercial applications. This study demonstrated that adhesive encapsulation by employing commercial polyimide tape, which significantly and simultaneously improved the water resistance and thermal stability of MAPbI(3–x)Brx perovskite films and PSCs. The stable operation of encapsulated PSCs in water with a power conversion efficiency of 19.1% was achieved, which was slightly higher than that of the device in air (18.2%). The devices with a stable power output could retain 96.3% of their initial efficiency in water for 1620 s under continuous illumination. In addition, the encapsulated MAPbI(3–x)Brx films could retain their tetragonal perovskite crystal structure after being heated at 240 °C for 180 min in an ambient environment. This adhesive encapsulation offers an avenue to improve the stability of halide perovskite devices for future commercialization.