Enhancing Stability Through Interface Engineering in Halide Perovskite Photovoltaics—Fundamental Insights

Over the past decade, organic-inorganic hybrid perovskite solar cells (PSCs) have demonstrated significant advancements, with the power conversion efficiencies (PCEs) of single-junction devices now nearing those of traditional silicon photovoltaics (PVs). Despite these achievements, the long-term stability of PSCs still falls short of that offered by silicon-based alternatives, which has notably hindered their path to commercialization. In response to these challenges, extensive research has focused on identifying the causes of instability, establishing protocols for long-term performance evaluation, and investigating various methods to enhance the durability of PSCs. Interface manipulation has emerged as a particularly crucial strategy. This approach not only helps to passivate or anchor surface defects in the perovskite but also serves as a protective barrier against environmental influences on the perovskite core. The recent development of diverse interface modification agents and strategies for interfacial regulation has significantly advanced the stability of PSCs. This presentation will delve into the factors affecting the stability of PSCs, offer a detailed exploration of the mechanisms behind device degradation, and introduce cutting-edge methods for addressing these issues. We will also cover key topics in interface manipulation, such as the application of low-dimensional perovskite capping layers, interface modification and reaction techniques, and the design of charge transport layers. Finally, we will provide insights into the essential aspects that will shape the future progress in enhancing the stability of PSCs.