Defects Mitigation and Charge Transport Promotion via a Multifunctional Lewis Base for Efficient 2D/3D Tin Perovskite Solar Cells

作     者：Chen, Yali Wang, Kun Chen, Wei Li, Tianxiang Tu, Hao Yang, Feng Kang, Ziyong Tong, Yu Wang, Hongqiang 

作者机构：Northwestern Polytech Univ Ctr Nano Energy Mat Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Shaanxi Joint Lab Graphene NPU Xian 710072 Peoples R China Northwestern Polytech Univ Sch Microelect Xian 710072 Peoples R China Shenzhen Technol Univ Ctr Intense Laser Applicat Technol Shenzhen Key Lab Ultraintense Laser & Adv Mat Tech Shenzhen 518118 Peoples R China Shenzhen Technol Univ Coll Engn Phys Shenzhen 518118 Peoples R China 

出 版 物：《ADVANCED ENERGY MATERIALS》 (Adv. Energy Mater.)

年 卷 期：2025年第15卷第22期

核心收录：

学科分类：0820[工学-石油与天然气工程] 070207[理学-光学] 07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China Natural Science Basic Research Program of Shaanxi [2024JC-YBQN-0443] Natural Science Foundation of Chongqing, China [CSTB2022NSCQ-MSX0926, CSTB2022NSCQ-MSX1335] 

主　　题：charge transport promotion defects mitigation Lewis base additive tin perovskite solar cells 

摘      要：Tin perovskite solar cells (PSCs) have garnered considerable attention as promising alternatives to lead PSCs due to their lower toxicity and outstanding optoelectronic properties. However, their efficiency and stability, particularly in 2D/3D tin PSCs, are usually hindered by high defect densities and inefficient carrier transport. In this study, a small-molecule Lewis base with multiple functional groups-cyanoacetohydrazide (CAH) is employed to mitigate defects and enhance charge transport in 2D/3D tin PSCs. It is revealed that the carbonyl, amine, and cyano groups in CAH form strong chemical bonds with Sn2+ ions, resulting in synergetic coordination effects. Moreover, the strong interaction between CAH and tin perovskite effectively regulates the crystallization process of perovskite film, resulting in a high-quality tin perovskite film with enhanced crystallinity, reduced defect density, and a modulated 2D/3D phase distribution. As a result, the optimized 2D/3D tin PSCs achieve a remarkable power conversion efficiency of 15.06%, marking one of the highest values for 2D/3D tin PSCs. Furthermore, the optimized devices exhibit outstanding stability, retaining 95% of their initial performance after 2000 h of storage in a nitrogen atmosphere.