Modulating Residual Lead Iodide via Functionalized Buried Interface for Efficient and Stable Perovskite Solar Cells

作者：Chunyan Deng, Jihuai Wu, Yuqian Yang, Yitian Du, Ruoshui Li, Qi Henry Chen, Yuan Xu, Weihai Sun, Zhang Lan, Peng Fei Gao · 发表于：ACS Energy Letters · 年份：2022 · DOI：10.1021/acsenergylett.2c02378 · 被引用次数：105 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Conducting polymers and applications

Sufficient lead iodide (PbI 2 ) in perovskite films effectively passivates defects and enhances device performance. However, excess large-grained PbI 2 clusters tend to be randomly distributed in the perovskite layer, which mitigate the positive effect of the PbI 2 . Here, we first modulated the distribution and size of PbI 2 clusters by functionalizing the buried interface of 4,4′-diaminodiphenyl sulfone hydroiodide (DDSI 2 ). As a multifunctional modifier, DDSI 2 can optimize the energy level of tin oxide (SnO 2 ) and passivate the buried interface defects via −NH 3 + and S═O functional groups. Moreover, the hydrogen bonding and coordination between DDSI 2 and perovskite retard the crystal growth rate and alleviate the lattice stress, thereby improving the quality of the perovskite and modulating the distribution of PbI 2 . Consequently, the DDSI 2 -modified device displays a power conversion efficiency of 24.10% and a storage stability of 1800 h. We demonstrate a unique strategy for the rational control of PbI 2 for efficient and stable perovskite solar cells.