Hu Lilei, Li Haibo, Xu Bo, Liu Yuqing, Yang Pinghui, Gao Xuan, Li Peifeng, Wang Jianpu, Li Renzhi
Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM) & School of Flexible Electroics (Future Technologies), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, China.
Changzhou University, Changzhou 213164, China.
ACS Appl Mater Interfaces. 2024 Aug 14;16(32):42221-42229. doi: 10.1021/acsami.4c08198. Epub 2024 Aug 1.
Quasi-two-dimensional (quasi-2D) layered perovskites with mixed dimensions offer a promising avenue for stable and efficient solar cells. However, randomly distributed three-dimensional (3D) perovskites near the film surface limit the device performance of quasi-2D perovskites due to increased nonradiative recombination and ion migration. Herein, we construct a 2D ( = 4 top)-3D-2D ( = 2 bottom) heterostructure of quasi-2D perovskites by using 3-chlorobenzylamine iodine, which can effectively reduce defect density and restrain ion migration. A champion efficiency of 22.22% for quasi-2D perovskite solar cells is achieved due to remarkably reduced nonradiative voltage loss and increased electron extraction. Additionally, the 2D-3D-2D perovskite solar cells also exhibit excellent thermal and humidity stabilities, retaining over 90 and 85% of the initial efficiencies after 2000 h under a heat stress of 65 °C and at air ambient of ∼50% humidity, respectively. Our results provide a general approach to tune perovskite films for suppressing ion migration and achieving high-performance perovskite solar cells.
具有混合维度的准二维（quasi-2D）层状钙钛矿为稳定高效的太阳能电池提供了一条有前景的途径。然而，由于非辐射复合增加和离子迁移，薄膜表面附近随机分布的三维（3D）钙钛矿限制了准二维钙钛矿的器件性能。在此，我们使用3-氯苄胺碘构建了准二维钙钛矿的2D（ = 4顶层）-3D-2D（ = 2底层）异质结构，这可以有效降低缺陷密度并抑制离子迁移。由于非辐射电压损失显著降低和电子提取增加，准二维钙钛矿太阳能电池实现了22.22%的最佳效率。此外，2D-3D-2D钙钛矿太阳能电池还表现出优异的热稳定性和湿度稳定性，在65°C的热应力和~50%湿度的空气环境下2000小时后，分别保持超过90%和85%的初始效率。我们的结果提供了一种调节钙钛矿薄膜以抑制离子迁移并实现高性能钙钛矿太阳能电池的通用方法。
