Research on passivation of perovskite layer in perovskite solar cells

Perovskite solar cells (PSCs), distinguished by their unique photoelectric properties, low device fabrication costs, and high photoelectric conversion efficiency, have garnered widespread attention. The perovskite active layer, as the central component of PSCs, is capable of absorbing solar radiation across specific wavelength ranges and facilitating the transport of photo-generated charge carriers. Consequently, the perovskite layer holds pivotal significance. However, inherent imperfections within this layer necessitate passivation efforts for optimization. This study classifies perovskite layer passivation into two categories: direct passivation and indirect passivation. Direct passivation involves direct reactions between substances and the surface ions of the perovskite, thereby inducing morphological alterations. Indirect passivation, on the other hand, relies on the introduction of external materials at the interface between the perovskite layer and the transport layer to mitigate perovskite layer defects. This work summarizes the impact of perovskite layer enhancements on the performance of PSCs.