材料科学
钙钛矿(结构)
结晶
能量转换效率
Crystal(编程语言)
相(物质)
单晶
载流子寿命
化学工程
结晶学
分析化学(期刊)
光电子学
硅
有机化学
化学
程序设计语言
计算机科学
工程类
作者
Zijia Li,Hao Gu,Xiaolong Liu,Haibin Wang,Nan Zhang,Jin‐Feng Liao,Dejian Yu,Xianqiang Xie,Yibo Zhou,Guojia Fang,Yiwang Chen,Junmin Xia,Shengchun Yang,Chao Liang
标识
DOI:10.1002/adma.202410408
摘要
Abstract 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 BA 2 MA 4 Pb 5 I 16 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 (BA 0.75 PFA 0.25 ) 2 MA 4 Pb 5 I 16 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 OC ) of 1.26 V, which is the record high efficiency and V OC for low n‐ value RPP solar cells ( n ≤ 5).
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