A team of scientists has developed a new method for creating durable perovskite solar cells that are cheaper and more sustainable than traditional silicon cells. Perovskite cells are promising because they can be made at room temperature using less energy. However, they are susceptible to moisture, oxygen, and heat, which can cause rapid performance degradation. The researchers combined two photoactive polymorphs of cesium lead iodide to form a phase-heterojunction, which suppresses the conversion to an undesirable phase and improves the stability of the cells. This heterojunction allows electrons to flow easily, resulting in enhanced power conversion efficiency. The researchers achieved a 21.59% power conversion efficiency, among the highest reported for this approach, and excellent stability. The dual deposition technique used in fabricating the cells could open up possibilities for other types of perovskite solar cells. Future work will focus on improving the durability of the cells and scaling them to the size of traditional solar panels. The researchers believe that with further advancements, the efficiency of perovskite cells could surpass 25% and lead to commercialization. The study was supported by the National Research Foundation of Korea.
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