Stable High-Performance Perovskite Solar Cells via Passivation of the Grain Boundary and Interface

作者：Leilei Gu, Shubo Wang, Yiqi Chen, Yibo Xu, Ruiyi Li, Di Liu, Xiang Fang, Xuguang Jia, Ningyi Yuan, Jianning Ding · 发表于：ACS Applied Energy Materials · 年份：2021 · DOI：10.1021/acsaem.1c01013 · 被引用次数：33 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Quantum Dots Synthesis And Properties

The carrier recombination at the perovskite grain boundary and layer interface is the main factor that limits the efficiency of the perovskite solar cells (PSCs). Herein, such recombination loss is significantly improved by inducing a new adduct [lead(II) iodide–tetramethylene sulfoxide (PbI 2 –TMSO)] into the perovskite precursor solution (this adduct can stably exist in the solution). After annealing, the grain boundary of the perovskite film can be passivated by the annealed-remaining PbI 2 . Notably, PbI 2 –TMSO changes the crystallization kinetics, resulting in large grain size and high crystallinity of the perovskite film. Subsequently, phenethylammonium iodide (PEAI) is further used to passivate the interface between perovskite and hole transporting layer for an excellent efficiency (22.84%). The two-dimensional perovskite formed by the reaction of PEAI and the residual PbI 2 (on the surface) improves the thermal stability. Moreover, a larger-area module (substrate: 4 × 4 cm 2, active area: 7.2 cm 2 ) with an efficiency of 16.82% is assembled successfully, indicating its scalability in passivation for PSCs.