Shao Cong, He Jiandong, Niu Guosheng, Dong Yuan, Yang Kaiyi, Cao Xiaofei, Wang Jizheng, Yang Haixia
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.
Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.
Small. 2024 May;20(22):e2309009. doi: 10.1002/smll.202309009. Epub 2023 Dec 15.
Using seeds to control the crystallization of perovskite film is an effective strategy for achieving high-efficiency perovskite solar cells (PSCs). Owing to their excellent environmental stability brought by their long alkyl chain, n-butylammonium (BA) cations are widely used for fabricating efficient and stable PSCs. However, BA-based 2D perovskite is seldom been investigated as a seed. Here, BAPbI is employed to regulate the crystallization of PbI, acting as nucleation centers. As a result, porous PbI film with high crystallinity is obtained, which allows the realization of perovskite film with preferential crystal orientations of (001) and large grain size of over 2 µm. The corresponding PSC achieves a high power conversion efficiency (PCE) of 24.30% and exhibits satisfactory stability, retaining 91.70% of the initial PCE after 300 h of thermal aging at 85°C.
使用种子来控制钙钛矿薄膜的结晶是实现高效钙钛矿太阳能电池（PSC）的有效策略。由于其长烷基链带来的优异环境稳定性，正丁基铵（BA）阳离子被广泛用于制造高效稳定的PSC。然而，基于BA的二维钙钛矿作为种子很少被研究。在此，BAPbI被用于调节PbI的结晶，作为成核中心。结果，获得了具有高结晶度的多孔PbI薄膜，这使得能够实现具有（001）优先晶体取向和超过2μm的大晶粒尺寸的钙钛矿薄膜。相应的PSC实现了24.30%的高功率转换效率（PCE），并表现出令人满意的稳定性，在85°C下热老化300小时后保留了初始PCE的91.70%。
