A Soft Nonpolar‐Soluble Two‐Dimensional Perovskite for General Construction of Mixed‐Dimensional Heterojunctions

作者：Yao Wang, Yao Wang, Bowei Li, Haifei Wang, Zeyu Zhang, Zhengzheng Dang, Yanfeng Miao, Ke Ma, Zhixiao Qin, Lei Lu, Ni Zhang, Yanming Wang, Yanming Wang, Yuetian Chen, Yixin Zhao · 发表于：Advanced Materials · 年份：2025 · DOI：10.1002/adma.202419750 · 被引用次数：8 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Multiferroics and related materials

Abstract Constructing mixed‐dimensional heterojunctions through ion exchange between functional organic ammonium halides and the already‐deposited bulk 3D perovskite films is a widely adopted strategy to effectively passivate and stabilize perovskite solar cells (PSCs). Such process poses challenges in precisely controlling the composition and distribution of the heterojunctions across the film, in particular for large‐area applications. Here, a soft 2D perovskite based on tetrapheptyl‐ammonium iodide (TPAI), noted as TPA 2 PbI 4 is reported. It is the first‐reported nonpolar readily soluble 2D perovskite, leading to highly compact and oriented perovskite layers. In addition, this nonpolar soluble TPA 2 PbI 4 is beneficial to universally construct thickness‐controllable mixed‐dimensional perovskite heterojunctions to suppress the non‐radiative recombination and promote charge‐carrier transfer on all the FA‐, MA‐ and CsPbI 3 PSCs. Such a unique strategy is also suitable for upscaling fabrication, demonstrated by 30 cm × 30 cm FAPbI 3 perovskite submodules with a certified efficiency of 22.06%.