Phosphine oxide additives for perovskite light-emitting diodes and solar cells

Lead halide perovskites have been considered promising semiconducting materials for next-generation optoelectronic devices due to their solution processability and excellent optoelectronic properties. Device performance of perovskite light-emitting diodes (PeLEDs) and perovskite solar cells (PSCs) has been rapidly developed during the past decade. Very recently, organic molecules containing phosphine oxide groups have emerged as promising additives and passivators to improve the device performance and stability of both PeLEDs and PSCs. In this perspective, we summarize recent progress in the development of new phosphine-oxide-based additives for PeLEDs and PSCs. The passivation mechanism, molecule design principle, and structure-property relationship of phosphine oxide molecules for PeLEDs and PSCs are systematically discussed and analyzed. Finally, we provide an outlook on the molecular design of novel phosphine oxide compounds for efficient and stable PeLEDs and PSCs in the future.