Stabilizing the Interfaces of Efficient Inverted Perovskite Solar Cells

Perovskite photovoltaics have made remarkable progress over the past decade, with the best lab-scale cells now achieving close to 27% power conversion efficiency. This rapid advancement is largely attributed to improved understanding and control of interfaces within perovskite solar cells. However, efficient interfaces do not always guarantee stability. In this talk, I will discuss the instability of these interfaces, particularly under the combined stress of light and heat, and explore pathways for their stabilization. One example of instability is the degradation of passivation agents. Another example is halide migration through the interface into the carrier transport layer and even the electrode. I will address the challenges related to degradation pathways at the hole transport layer interface in PbSn perovskite solar cells.