Research Highlights: Dual-Function Interface Engineering for δ-Phase-Free Crystallization Toward Efficient and Stable FAPbI3 Perovskite Solar Cells

The presence of non-perovskite δ-phase at the buried interface between the perovskite active layer and the charge transport layer significantly hinders the commercialization of perovskite solar cells. This is primarily due to the difficulty in detecting it during the initial device fabrication. This unwanted phase acts as a nucleation site for degradation and is notoriously difficult to eliminate once formed.… Read More