Perovskite PV technology harnesses materials with a perovskite-like crystal structure to efficiently convert sunlight into electricity using a thin active layer. This emerging technology is important due to its potential for high efficiency, comparable to or exceeding silicon, coupled with the prospect of lower production costs through solution processing and printing. Its versatility allows for fabrication on flexible and lightweight substrates, enabling new applications like solar films and coatings, while its tunable bandgap facilitates optimization and the development of high-efficiency tandem solar cells. Compared to traditional silicon PV, perovskite PV offers a path to potentially higher performance at lower costs and opens doors to diverse applications, making it a promising candidate to shape the future of solar energy, even as ongoing research addresses challenges like long-term stability.

Tandem PV technology involves stacking two or more different types of solar cells to absorb a broader spectrum of sunlight than a single-junction cell, thus exceeding the efficiency limits of traditional designs. Perovskite materials are particularly attractive for tandem applications due to their tunable bandgap, which allows them to be optimized as a top cell to absorb high-energy photons, while a bottom cell (like silicon) captures lower-energy light. This combination promises significantly higher power conversion efficiencies, potentially leading to more cost-effective solar energy. Perovskite-silicon tandems, in particular, have shown rapid efficiency gains, surpassing the theoretical limits of silicon alone and leveraging the mature manufacturing infrastructure of silicon technology. While challenges remain in terms of long-term stability and large-scale production, tandem PV, especially with perovskites, represents a crucial pathway to achieving ultra-high efficiency solar energy conversion for the future.