To fabricate efficient formamidinium tin iodide (FASnI 3 ) perovskite solar cells (PSCs), it is essential to deposit uniform and dense perovskite layers and reduce Sn 4+ content. Here we used solvent-engineering and nonsolvent dripping process with SnF 2 as an inhibitor of Sn 4+ . However, excess SnF 2 induces phase separation on the surface of the perovskite film. In this work, we report the homogeneous dispersion of SnF 2 via the formation of the SnF 2 -pyrazine complex. Consequently, we fabricated FASnI 3 PSCs with high reproducibility, achieving a high power conversion efficiency of 4.8%. Furthermore, the encapsulated device showed a stable performance for over 100 days, maintaining 98% of its initial efficiency.
ASJC Scopus subject areas
- Colloid and Surface Chemistry