| 초록 |
Although its high photoconversion efficiency (PCE), low humidity stability blocks the way toward commercialization of halide perovskite-based photovoltaics. To overcome this critical hurdle, it is important to focus on grain boundary of halide perovskites. Accordingly, engineering grain boundary of halide perovskites can be a promising way to fabricate devices with high humidity stability. Herein, pressure-induced crystallization of halide perovskite film is demonstrated as a grain boundary healing technique for high moisture stability. After exposure to the condition of RH 85% 30 ℃, we observed enhanced moisture stability. Also, we revealed that pressure-induced crystallization enhances moisture stability not only by enlarging grain size of halide perovskites but also by reducing grain boundary angles. The devices with pressure-induced crystallization exhibited dramatically stabilized performance, sustaining over 0.7 normalized PCE after 200hr under RH 45%, 30℃. |
