Monolithic Perovskite/Perovskite/Silicon Triple-Junction Solar Cells: Fundamentals, Progress, and Prospects.

Crystalline silicon (c-Si) solar cells, though dominating the photovoltaic market, are nearing their theoretical power conversion efficiencies (PCE) limit of 29.4%, necessitating the adoption of multi-junction technology to achieve higher performance. Among these, perovskite-on-silicon-based multi-junction solar cells have emerged as a promising alternative, where the perovskite offering tunable bandgaps, superior optoelectronic properties, and cost-effective manufacturing. Recent announced double-junction solar cells (PSDJSCs) have achieved the PCE of 34.85%, surpassing all other double-junction technologies. Encouragingly, the rapid advancements in PSDJSCs have spurred increased research interest in perovskite/perovskite/silicon triple-junction solar cells (PSTJSCs) in 2024. This triple-junction solar cell configuration demonstrates immense potential due to their optimum balance between achieving a high PCE limit and managing device complexity. This review provides a comprehensive analysis of PSTJSCs, covering fundamental principles, and technological milestones. Current challenges, including current mismatch, open-circuit voltage deficits, phase segregation, and stability issues, and their corresponding strategies are also discussed, alongside future directions to achieve long-term stability and high PCE. This work aims to advance the understanding of the development in PSTJSCs, paving the way for their practical implementation.