Abstract 

Organic-inorganic hybrid perovskite solar cells (PSCs) have shown great progress over the past decade, with power conversion efficiencies (PCEs) of single-junction devices approaching silicon photovoltaics (PVs). However, their long-term stability still lags behind silicon-based competitors, which has significantly decelerated their commercialization progress. Faced with this challenge, major efforts have been made to unravel instability mechanisms, develop long-term performance-tracking protocols, and explore various approaches for enhancing the stability of PSCs. Among these strategies, interface manipulation is the most critical as it could simultaneously passivate or anchor the perovskite surface defects and acts as a barrier to protect the bulk of perovskite from the external environment. Recently, the development of diversified interface modification molecules and interfacial regulation strategies has greatly contributed to the improvement of PSC stability. This presentation will elucidate the factors influencing the stability of PSCs, provide an in-depth understanding of device degradation mechanisms, and present advanced approaches to reveal them. Additionally, we will discuss pressing topics on interface manipulation, including low-dimensional perovskite capping layers, interface modification and reaction, and charge transport layer design. Lastly, we will provide insights into the core aspects related to the future development of PSC stability.