Two-dimensional (2D) lead halide perovskite materials are emerging as one of promising light-absorbing materials in perovskite solar cells (PSCs), which show outstanding stability and defect passivation. Unfortunately, the power conversion efficiency (PCE) of those stable 2D PSCs is still far behind that of 3D PSCs. Herein, we reported a simple in-situ growth technique for the ethylenediamine lead iodide (EDAPbI₄) layer on the top of formamidinium lead iodide (FAPbI₃) layer. The rationally designed layered architecture of 2D-3D perovskite film could improve the PCE of the PSCs. In addition, benefiting from the high moisture resistance and inhibited ion migration of EDAPbI₄ layer, the 2D-3D-based devices showed obviously enhanced long-term stability, keeping the initial PCE value for 200 h and 90% of its initial PCE even after 500 h.

二维（2D）卤化铅钙钛矿材料正在成为钙钛矿太阳能电池（PSC）中最有希望的吸光材料之一，其表现出出色的稳定性和缺陷钝化。不幸的是，那些稳定的2D PSC的功率转换效率（PCE）仍然远远落后于3D PSC。在此，我们报道了简单的原位为乙二胺碘化铅生长技术（EDAPbI ₄上甲脒碘化铅的顶部）层（FAPbI ₃）层。合理设计2D-3D钙钛矿薄膜的分层体系结构可以改善PSC的PCE。此外，得益于EDAPbI ₄的高耐湿性和抑制的离子迁移 在2D-3D层中，基于2D-3D的设备显示出明显增强的长期稳定性，即使在500小时后仍能保持200 h的初始PCE值和90％的初始PCE值。