利用热气流辅助退火改善卤化铅钙钛矿薄膜及器件性能

Physical and chemical controlling of the lead halide perovskite films is crucial to minimize defects and improve overall performance and stability of perovskite solar cells. In this study, applying a hot flow of dry air on the surface of perovskite films during hot plate annealing is investigated. We found that this technique leads to a smooth texture and reduces the surface defects. A hot dry airflow of 15 L/min improves the power conversion efficiency from 13.56% to 15.31%, with approximately 4.3% and 10.4% enhancement of fill factor and short-circuit current density, respectively. However, increasing the rate of dry airflow leads to large voids, which is a critical concern for leakage current and performance degradation.