Potassium iodide (KI) doping plays a significant role in improving the performance and reducing hysteresis in perovskite solar cells (PSCs). Here are the key ways that KI doping helps achieve hysteresis-free PSCs:
- Surface Defect Passivation: KI dopants help in passivating surface defects. By reducing these defects, the electrical properties of the perovskite film are stabilized, which leads to reduced hysteresis and improved carrier lifetime in perovskite solar cells.
- Crystallinity Improvement: KI doping can enhance the crystallinity of the perovskite film. Improved crystallinity often results in fewer defects and better charge transport, contributing to reduced hysteresis.
- Photoluminescence Enhancement: Co-doping with KI and other substances, such as water, can significantly increase photoluminescence intensity; this indicates reduced defect density, which is crucial for achieving hysteresis-free operation.
In summary, KI doping helps to create more stable and efficient perovskite solar cells by reducing defects, improving crystallinity, and enhancing photoluminescence properties, all of which are essential for achieving hysteresis-free performance.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/what-role-does-ki-doping-play-in-achieving-hysteresis-free-perovskite-solar-cells/
