Exploring Red, Green, and Blue Light-Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

摘要

Hybrid perovskite solar cells with a high specific power have great potential tobecome promising power sources mounted on spacecrafts in space applications.However, there is a lack of study on their photostability as light absorbers inthose conditions. Herein, the stability of the perovskite films and solar cells underred, green, and blue (RGB) light illumination in medium vacuum that belongs tonear space is explored. The perovskite active layers exhibit different degradationsfrom morphological, chemical, and structural points of view. This is attributed tothe strong coupling between photoexcited carriers and the crystal lattice and thediversity of RGB light absorption in the perovskite films. Device characterizationsreveal that the efficiency loss of perovskite solar cells results from not onlyperovskite degradation, but also the photoexcited carriers reducing the energybarrier of ion migration and accelerating the migration to generate more deepleveltrap defects. Moreover, comparative devices suggest that the well encapsulationcan weaken the effect of vacuum on stability.