Zhuang Xinmeng, Zhou Donglei, Jia Yanrun, Liu Shuainan, Liang Jin, Lin Yuze, Hou Huiqing, Qian Dongmin, Zhou Tingting, Bai Xue, Song Hongwei
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China.
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
Adv Mater. 2024 Sep;36(36):e2403257. doi: 10.1002/adma.202403257. Epub 2024 Jul 18.
The buried interface properties of the perovskite solar cells (PSCs) play a crucial role in the power conversion efficiency (PCE) and operational stability. The metal-oxide/perovskite heterogeneous interfaces are highly defective and cause serious ion migration. However, the buried and unexposed bottom interface and simultaneous stabilization of grain boundaries receive less attention and effective solutions. To tackle this problem, a solid-liquid strategy is employed by introducing oily-additive allicin at the buried interface to passivate the shallow (V and Vo) and deep traps (V and Pb). Interestingly, oily status allicin fills the pinholes at the heterointerface and wraps the perovskite grains, suppressing the ion migration during the photoaging process. As a result, an outstanding PCE of 25.07% is achieved with a remarkable fill factor (FF) of 84.03%. The modified devices can maintain 94.51% of the original PCE after light soaking under 1-sun illumination for 1000 h. This work demonstrates a buried interface modification method that employs an eco-friendly additive, which helps promote the development of PSCs with high performance and stability.
钙钛矿太阳能电池（PSC）的掩埋界面特性在功率转换效率（PCE）和运行稳定性方面起着至关重要的作用。金属氧化物/钙钛矿异质界面存在大量缺陷，并会导致严重的离子迁移。然而，掩埋且未暴露的底部界面以及晶界的同时稳定化受到的关注较少，且缺乏有效的解决方案。为了解决这个问题，通过在掩埋界面引入油性添加剂大蒜素采用了一种固液策略，以钝化浅陷阱（V和Vo）和深陷阱（V和Pb）。有趣的是，油性状态的大蒜素填充了异质界面处的针孔并包裹了钙钛矿晶粒，抑制了光老化过程中的离子迁移。结果，实现了25.07%的出色PCE以及84.03%的显著填充因子（FF）。经过1000小时的1个太阳光照光浸泡后，改性器件可保持原始PCE的94.51%。这项工作展示了一种采用环保添加剂的掩埋界面改性方法，有助于推动高性能和稳定的PSC的发展。
