Robust Perovskite Solar Cells for Extreme and Emerging Applications

Abstract Perovskite solar cells (PSCs), with their lightweight nature, ultrahigh power conversion efficiency, and tunable optoelectronic properties, offer unprecedented opportunities beyond the scope of traditional photovoltaics. These advantages have accelerated their exploration in emerging and extreme‐use scenarios, including space‐based systems, indoor light harvesting, concentrated photovoltaics, and flexible or wearable electronics. However, current studies on PSCs deployment in such specialized environments remain fragmented, and a critical and in‐depth understanding of their resilience under coupled external stressors is still lacking. This review pioneers a hierarchical dissection spanning application‐specific demands, device design principles, and perovskite material fundamentals, enabling the systematic identification of dominant degradation pathways across diverse operational contexts. It is critically assessed, for the first time, how extreme conditions (such as high/low temperatures, ionizing radiation, variable illumination, and mechanical deformation in flexible systems) impact photovoltaic performance and the underlying mechanisms. The discussion further unravels key challenges in the field, including long‐term material stability, interface failure, and mechanical fatigue, and explores future directions such as advanced degradation studies, machine learning assisted material design, multifunctional interface engineering, and planar‐to‐fiber architectures evolution. This review aims to bridge fundamental understanding with application‐specific needs, guiding the development of robust PSCs tailored for next‐generation, mission‐critical applications.