2D-Quasi-2D-3D Hierarchy Structure for Tin Perovskite Solar Cells with Enhanced Efficiency and Stability

Recently, tin perovskite solar cells (PSCs) have attracted a great deal of research interest due to their low toxicity, ideal band gap, and earth-abundant elements. However, the poor stability and high density of defects severely limit the performance of tin PSCs. The incorporation of low-dimensional perovskite with molecule-protecting layers is vital to overcome the obstacles. Herein, we demonstrate a hierarchy structure tin perovskite induced by the removable pseudohalogen regulator NH 4 SCN. The hierarchy structure comprising highly parallel-orientation 2D-quasi-2D-3D FASnI 3 significantly enhances stability and oxidation resistance. We then explored the hierarchy structure PSCs and achieved a PCE up to 9.41% with high reproducibility. This work suggests an effective strategy to build tin PSCs with high performance and long-term stability. © 2018 Elsevier Inc.