Breakthrough Promises More Durable Perovskite Solar Modules
Researchers have developed a scalable solution soaking quenching technique that enables the production of efficient and durable wide bandgap perovskite solar modules. The study, published in *Nature Communications*, is a significant step toward commercializing the technology for building-integrated photovoltaics (BIPV). The process's large-area processability could also influence future developments in advanced lighting substrates like OLEDs.
- Perovskite solar cells are notoriously unstable, degrading when exposed to moisture, oxygen, heat, and UV light. This instability is a primary barrier to commercialization, as traditional silicon-based panels can last for 25-30 years, whereas early perovskite cells deteriorated much more rapidly. - Wide-bandgap perovskites are crucial for creating high-efficiency tandem solar cells, where they are layered with silicon or other perovskite cells to capture more of the solar spectrum. However, these specific perovskites often suffer from photo-induced phase segregation, where the material's components separate under illumination, hindering stability. - The "quenching" process is a critical fabrication step that rapidly removes the solvent from the perovskite precursor solution to initiate crystallization. Poor control during this stage can lead to morphological defects like pinholes and wrinkles in the perovskite film, which reduce the solar cell's performance and durability. - Gas quenching, an alternative to dripping antisolvents, offers more uniform solvent removal over large areas, which is essential for industrial-scale manufacturing. This improved control helps create smoother, higher-quality perovskite films, leading to better device performance. - Companies like Oxford PV have begun commercial production of perovskite-on-silicon tandem solar panels, with one U.S. customer already receiving a shipment for a utility-scale installation. Similarly, Panasonic aims to commercialize its perovskite "power generation glass" for BIPV applications in 2026, targeting mass production ahead of schedule. - While lab-scale perovskite cells have achieved efficiencies rivaling or exceeding traditional silicon (over 26%), translating this to large, stable modules is a major challenge. Researchers are now focused on maintaining high efficiency and stability as the cell area is scaled up for real-world applications. - For building-integrated photovoltaics (BIPV), a key application, semi-transparent perovskite cells must achieve an average visible transmittance (AVT) of around 25% to be viable for window applications, creating a trade-off between transparency and power conversion efficiency. - The levelized cost of electricity (LCOE) from perovskite-silicon tandem cells could be 10-20% lower than pure silicon, provided that module efficiencies surpass 30% and lifetimes become comparable to silicon through continued research and development.
