Reconstruction and Solidification of Dion–Jacobson Perovskite Top and Buried Interfaces for Efficient and Stable Solar Cells
Jifei Wang, Guozheng Nie, Wenjin Huang, Yuanyuan Guo, Yongjun Li, Zhangqiang Yang, Yan Chen, Kang Ding, Ye Yang, Weike Wang, Le‐Man Kuang, Kaike Yang, Dongsheng Tang, Yaxin Zhai
Abstract
Quasi-two-dimensional (Q-2D) perovskites show great potential in the field of photonic and optoelectronic device applications. However, defects and local lattice dislocation still limit performance and stability improvement by nonradiative recombination, unpreferred phase distribution, and unbonded amines. Here, a low-temperature synergistic strategy for both reconstructing and solidifying the perovskite top and buried interface is developed. By post-treating the 1,4-phenylenedimethanammonium (PDMA) based (PDMA)MA 4 Pb 5 I 16 films with cesium acetate (CsAc) before thermal annealing, a condensation reaction between R-COO – and -NH 2 and ion exchange between Cs + and MA + occur. It converts the unbonded amines to amides and passivates uncoordinated Pb 2+ . Meanwhile, it adjusts film composition and improves the phase distribution without changing the out-of-plane grain orientation. Consequently, performance of 18.1% and much-enhanced stability (e.g., stability for photo-oxygen increased over 10 times, light-thermal for T 90 over 4 times, and reverse bias over 3 times) of (PDMA)MA 4 Pb 5 I 16 perovskite solar cells are demonstrated.