Perovskite‐Based Triple‐Junction Solar Cells

Traditional perovskite solar cells utilize a single bandgap-based perovskite layer for light-to-energy conversion. In contrast, triple-junction solar cells enhance light absorption and improve power conversion efficiency (PCE) by integrating three photoactive layers with distinct bandgaps. These layers absorb different light wavelengths, enabling a broader solar spectrum capture and significantly improving PCE. By optimizing interlayer architectures, triple-junction solar cells overcome the efficiency limitations of single-junction devices. Recent lab advancements have achieved over 30% efficiency in perovskite-based triple-junction solar cells, surpassing the 27.0% PCE of single-junction perovskite cells, 27.6% for silicon-based single-junction cells, and 19.2% for organic solar cells. Nonetheless, challenges persist in enhancing PCE, improving material and device stability, addressing manufacturing complexities, and managing end-of-life disposal. Additionally, constructing multilayer structures demands precise control over interfacial and layer thickness parameters. Here, the structural principles of multijunction solar cells are explored and an in-depth analysis of various perovskite-based triple-junction configurations, including all-Perovskite, Perovskite/Perovskite/Si, and Perovskite/Perovskite/Organic combinations is provided.