Low dimensional (LD) perovskite materials generally exhibit superior chemical stability against ambient moisture and thermal stress than that of 3D perovskites. Recently, LD perovskite has been used as a passivation layer on the surface of 3D perovskite grains. Although various LD perovskites have been developed focusing on their hydrophobicity, the impact of crystal structure of LD perovskite on the photovoltaic performance of perovskite solar cell (PSC) is still uncertain. In this work, the effects of the structural characteristics of LD perovskites on the crystal formation of formamidinium lead triiodide (α‐FAPbI₃) and on the optoelectrical properties of PSCs are elucidated. The phase‐transformation kinetics of FAPbI₃ mixed with LD perovskites is studied using the Johnson–Mehl–Avrami–Kolmogorov model. It is found that the arrangement of PbI₆ octahedra in the LD perovskite changes the rate of α‐FAPbI₃ formation. Facilitated nucleation of α‐FAPbI₃ at the LD/FAPbI₃ interface results in minimal structural disorder and prolonged charge‐carrier lifetimes. As a result, the PSC with the optimized LD perovskite structure exhibits a power conversion efficiency of 21.25% from a reverse current–voltage scan, and stabilized efficiency of 19.95% with excellent ambient stability without being encapsulated.

中文翻译：

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高效稳定的钙钛矿型钙钛矿型太阳能电池有机间隔物阳离子的分子工程

与3D钙钛矿相比，低尺寸（LD）钙钛矿材料通常对环境湿气和热应力表现出优异的化学稳定性。最近，LD钙钛矿已被用作3D钙钛矿颗粒表面的钝化层。尽管已经开发了各种LD钙钛矿以其疏水性为重点，但是LD钙钛矿的晶体结构对钙钛矿太阳能电池（PSC）的光伏性能的影响仍然不确定。在这项工作中，对晶体形成甲脒铅三碘化物（α-FAPbI LD钙钛矿的结构特征的影响₃）和省电类别的光电性质阐明。FAPbI ₃的相变动力学使用Johnson-Mehl-Avrami-Kolmogorov模型研究了与LD钙钛矿混合的情况。据发现，碘化铅的布置₆八面体在LD钙钛矿改变α-FAPbI率₃形成。促进α-FAPbI的成核₃的LD / FAPbI ₃在最小的结构紊乱和延长的充电载流子寿命界面的结果。结果，具有优化的LD钙钛矿结构的PSC在反向电流-电压扫描中表现出21.25％的功率转换效率，在没有封装的情况下具有19.95％的稳定效率和出色的环境稳定性。