Qian Jie, Li Yawen, Shen Yifan, Zhao Xiangqing, Wu Chong, Gu Hao, Zhang Zhipeng, Chen Yanfeng, Cai Bo, Xia Junmin, Shen Wei, Cao Kun, Liu Lihui, Zhang Lijun, Cheng Gang, Chen Shufen, Xing Guichuan, Huang Wei
State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, International Center of Computational Method and Software and College of Materials Science and Engineering, Jilin University, Changchun 130012, China.
ACS Nano. 2024 Jun 11;18(23):15055-15066. doi: 10.1021/acsnano.4c02076. Epub 2024 Jun 2.
The stability issue of Sn-based perovskite solar cells (PSCs) is expected to be resolved by involving a two-dimensional (2D) layered structure. However, Sn-based 2D PSCs, especially Dion-Jacobson (DJ)-phase ones with potentially good stability, have rarely been reported. Herein, superior DJ-phase Sn 2D perovskites with 3-aminobenzylamine (3ABA) or 4-aminobenzylamine (4ABA) π-conjugated short-chain ligands are reported to fabricate efficient 2D lead-free PSCs. Notably, the high dipole moment of the 3ABAI organic spacer is approved to possess faster charge transfer for forming (3ABA)FASnI 2D perovskite with an extremely low exciton binding energy (only 84 meV). In combination with a diacetate partial substitution and methylamine iodide/bromide (MAI/MABr) post-treatment strategy to delay crystallization and improve compactness and coverage of the perovskite film, a record power conversion efficiency (PCE) of 6.81% and stability of 840 h (less than 5% degradation in a N atmosphere for unencapsulated devices) are acquired in eventual (3ABA)FASnI 2D PSCs, which are among the highest PCE and the longest stability of Sn-based 2D PSCs reported to date. Our work provides a prospective molecule design and film preparation strategy of 2D Sn perovskites toward nontoxic high-performance tin-based PSCs, which pushes the almost stagnant research forward.
基于锡的钙钛矿太阳能电池（PSCs）的稳定性问题有望通过引入二维（2D）层状结构来解决。然而，基于锡的二维PSCs，尤其是具有潜在良好稳定性的狄翁-雅各布森（DJ）相PSCs，鲜有报道。在此，报道了具有3-氨基苄胺（3ABA）或4-氨基苄胺（4ABA）π共轭短链配体的优异DJ相二维锡基钙钛矿，用于制备高效的二维无铅PSCs。值得注意的是，3ABAI有机间隔基的高偶极矩被证实具有更快的电荷转移，从而形成具有极低激子结合能（仅84毫电子伏特）的(3ABA)FASnI二维钙钛矿。结合二乙酸部分取代以及甲胺碘化物/溴化物（MAI/MABr）后处理策略以延迟结晶并提高钙钛矿薄膜的致密性和覆盖率，最终的(3ABA)FASnI二维PSCs获得了创纪录的功率转换效率（PCE）6.81%以及840小时的稳定性（在氮气气氛中未封装器件的降解小于5%），这是迄今为止报道的基于锡的二维PSCs中最高的PCE和最长的稳定性之一。我们的工作为二维锡基钙钛矿用于无毒高性能锡基PSCs提供了一种前瞻性的分子设计和薄膜制备策略，推动了几乎停滞不前的研究向前发展。
