Exploring RGB Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Application

摘要： Hybrid perovskite solar cells with high specific power have great potential of becoming a promising power source mounted on spacecraft in space application. However, there is a lack of study on their photostability as light absorber at the condition. Here, we explore the stability of the perovskite films and solar cells under RGB light illumination in the medium vacuum that belongs to near space. The perovskite active layers exhibit the different degradations from morphological, chemical and structural point of view. This is attributed to the strong coupling between photoexcited carriers and the crystal lattice, and the diversity of RGB light absorption in the perovskite films. Device characterizations reveals that the efficiency loss of perovskite solar cells results from not only the perovskite degradation, but also the photoexcited carriers reducing the energy barrier of ion migration and accelerating the migration to generate more deep-level trap defects. Moreover, comparative devices suggest that the well encapsulation could weaken the effect of the vacuum on the stability.