Li Zijia, Gu Hao, Liu Xiaolong, Wang Haibin, Zhang Nan, Liao Jinfeng, Yu Dejian, Xie Xianqiang, Zhou Yibo, Fang Guojia, Chen Yiwang, Xia Junmin, Yang Shengchun, Liang Chao
MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Shenzhen, 440300, P. R. China.
Adv Mater. 2024 Nov;36(48):e2410408. doi: 10.1002/adma.202410408. Epub 2024 Oct 12.
2D Ruddlesden-Popper perovskites (RPPs) have attracted extensive attention in recent years due to their excellent environmental stability. However, the power conversion efficiency (PCE) of RPP solar cells is much lower than that of 3D perovskite solar cells (PSCs), mainly attributed to their poor carrier transport performance and excessive heterogeneous phases. Herein, the binary spacers (n-butylammonium, BA and benzamidine, PFA) are introduced to regulate the crystallization kinetics and n-value phase distribution to form uniform phase permutation of RPP films. The study then incorporates n = 5 BAMAPbI memory single crystal to achieve ultrafast stepped-type carrier transport from the low n-value phases to the high n-value phases in the high-quality (BAPFA)MAPbI films. These binary spacers and single-crystal-assisted crystallization strategies produce high-quality films, leading to fast carrier extraction and significant nonradiative recombination suppression. The resulting PSC presents a champion PCE of 21.15% with an impressive open circuit voltage (V) of 1.26 V, which is the record high efficiency and V for low n-value RPP solar cells (n ≤ 5).
二维Ruddlesden-Popper钙钛矿（RPPs）近年来因其出色的环境稳定性而备受关注。然而，RPP太阳能电池的功率转换效率（PCE）远低于三维钙钛矿太阳能电池（PSC），这主要归因于其较差的载流子传输性能和过多的异质相。在此，引入二元间隔基团（正丁基铵，BA和苯甲脒，PFA）来调节结晶动力学和n值相分布，以形成RPP薄膜的均匀相排列。该研究随后结合n = 5的BAMAPbI记忆单晶，以在高质量的（BAPFA）MAPbI薄膜中实现从低n值相到高n值相的超快阶梯型载流子传输。这些二元间隔基团和单晶辅助结晶策略产生了高质量的薄膜，从而实现了快速的载流子提取并显著抑制了非辐射复合。所得的PSC的最佳PCE为21.15%，开路电压（V）高达1.26 V，这是低n值RPP太阳能电池（n≤5）的创纪录高效率和开路电压。
