Recent progress on the efficiency and stability of lead-free Cs2AgBiBr6 double halide perovskite solar cells

Within a decade, the power congversion efficiency (PCEs) of metal-halide perovskite solar cells (PSCs) moves upward from 3.9% to 25.7%, making them competitive with current state-of-the-art silicon-based counterparts. This steepest growth of the PCEs suggests that the commercialization of this technology might be easing the energy transition from fossil fuel to renewable energy. However, a wide range of factors restrict the commercial viability of PSCs like their toxicity and instability. A crucial and difficult task in the field of PSCs is the replacement of Pb-based perovskite with non-toxic and eco-friendly material while maintaining high-performance with improved stability. Cs2AgBiBr6 halide double perovskites (HDP) material seems to be very promising in this regard. This article reviews the recent progress in Cs2AgBiBr6 double PSC devices, especially fabrication techniques including the advancement of its efficiency and stability. Here, the evolution of Cs2AgBiBr6 towards the application and fabrication of PSCs has also been discussed. This study also analyzed the impact of numerous environmental stresses, such as mechanical, thermal, and optical stresses including the potential prospects in the case of Pb-free PSCs.