Preparation of High-Performance Inorganic Perovskite Solar Cells through In Situ Ion-Exchange-Controlled Crystallization

作者：Jia Li, Jingping Gao, Sanlong Wang, Ji Qi · 发表于：Langmuir · 年份：2025 · DOI：10.1021/acs.langmuir.5c02974 · 被引用次数：2 · 研究领域：Perovskite Materials and Applications、Solid-state spectroscopy and crystallography、Conducting polymers and applications

Enhancing film quality and passivating defects are effective strategies for improving the power conversion efficiency ( PCE ) and the open-circuit voltage ( V OC ) of inorganic perovskite solar cells (IPSCs). In this study, an in situ ion exchange (ISIE) approach was put forward to synthesize dimethylammonium acetate (DMAAc) and lead iodide (PbI 2 ), which controls crystallization and passivates defects. The reaction between lead acetate (Pb(Ac) 2 ) and dimethylammonium iodide (DMAI) occurs spontaneously, yielding PbI 2 and DMAAc. Therefore, this additional reaction establishes a minor competitive relationship during the crystallization process, thereby enhancing crystal growth by slowing the rate of crystallization. Furthermore, both PbI 2 and DMAAc serve to passivate defects and improve film quality, respectively. The nonradiative recombination is minimized, and the configuration of energy levels is optimized. As a result, the champion PCE of inverted IPSCs fabricated in air reaches 21.23%. This represents one of the highest PCE values currently recorded among IPSCs.