Duan Xiaopeng, Li Xiang, Tan Licheng, Huang Zengqi, Yang Jia, Liu Gengling, Lin Zhuojia, Chen Yiwang
College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Adv Mater. 2020 Jul;32(26):e2000617. doi: 10.1002/adma.202000617. Epub 2020 May 25.
Sequential deposition is certified as an effective technology to obtain high-performance perovskite solar cells (PVSCs), which can be derivatized into large-scale industrial production. However, dense lead iodide (PbI ) causes incomplete reaction and unsatisfactory solution utilization of perovskite in planar PVSCs without mesoporous titanium dioxide as a support. Here, a novel autonomously longitudinal scaffold constructed by the interspersion of in situ self-polymerized methyl methacrylate (sMMA) in PbI is introduced to fabricate efficient PVSCs with excellent flexural endurance and environmental adaptability. By this strategy perovskite solution can be confined within an organic scaffold with vertical crystal growth promoted, effectively inhibiting exciton accumulation and recombination at grain boundaries. Additionally, sMMA cross-linked perovskite network can release mechanical stress and occupy the main channels for ion migration and water/oxygen permeation to significantly improve operational stability, which opens up a new strategy for the commercial development of large-area PVSCs in flexible electronics.
顺序沉积被认证为一种获得高性能钙钛矿太阳能电池（PVSCs）的有效技术，该技术可衍生为大规模工业生产。然而，在没有介孔二氧化钛作为支撑的平面PVSCs中，致密的碘化铅（PbI₂）会导致钙钛矿反应不完全以及溶液利用率不理想。在此，引入了一种通过原位自聚合甲基丙烯酸甲酯（sMMA）分散在PbI₂中构建的新型自主纵向支架，以制造具有优异抗弯曲耐久性和环境适应性的高效PVSCs。通过这种策略，钙钛矿溶液可被限制在有机支架内，促进垂直晶体生长，有效抑制激子在晶界处的积累和复合。此外，sMMA交联的钙钛矿网络可释放机械应力，并占据离子迁移以及水/氧渗透的主要通道，从而显著提高运行稳定性，这为柔性电子学中大面积PVSCs的商业发展开辟了新策略。
