Antisolvent treatment of reproducible MAPbI3 perovskite solar cells in ambient atmosphere

High sensitivity to external environments such as moisture, heat, oxygen, and ultraviolet light is an obstacle that must be overcome for the successful large-scale commercialization of organometallic hybrid perovskite solar cells. In particular, sufficiently high humidity resistance is essential for the synthesis of reproducible high-quality perovskite films in ambient atmosphere. In this study, we used ethyl acetate as an antisolvent during the film fabrication process to protect the moisture-sensitive perovskite intermediate phase. As a result, a very high-power conversion efficiency (PCE) of 13.71% with a small standard deviation was achieved in a manufacturing environment with a 50% relative humidity, which was more than three times larger than the PCE of cells treated with diethyl ether under the same conditions. The findings of this work will allow fabricate efficient and reproducible perovskite solar cells in ambient atmosphere.