Tailoring Anchoring Groups in Low-Dimensional Organic Semiconductor-Incorporated Perovskites
Tailoring Anchoring Groups in Low-Dimensional Organic Semiconductor-Incorporated Perovskites
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DOI：
10.1002/sstr.202100173
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发表时间：
2022-01-25
期刊：
影响因子：
15.9
通讯作者：
Dou, Letian
中科院分区：
文献类型：
--
作者：
Liang, Aihui;Ma, Ke;Dou, Letian
低维有机掺杂钙钛矿（OSiPs）是一种有机阳离子嵌入到无机八面体骨架之间的杂化结构。它们表现出更高的结构和成分可调性、迷人的电子特性以及更高的稳定性，适用于广泛的应用。目前，共轭有机结构单元和金属卤化物无机结构单元之间的相互作用尚未得到充分研究。本文报道了一系列具有甲脒、咪唑和苯并咪唑端基的基于双噻吩的共轭配体，以研究不同锚定基团对晶体结构、相形成和器件性能的影响。结果表明，配体的端基对配体与钙钛矿中八面体的相互作用有重要影响，从而决定了钙钛矿晶体结构的形成。只有通过具有咪唑鎓和苯并咪唑鎓端基的配体钝化的3D钙钛矿太阳能电池表现出功率转换效率的增强以及滞后的降低。通过对锚定基团的剪裁，为设计新型OSiPs结构和功能提供了一种新的策略。
Low-dimensional, organic semiconductor-incorporated perovskites (OSiPs) are hybrid structures with functional organic cations intercalated between inorganic octahedron frameworks. They exhibit increased structural and compositional tunability, fascinating electronic properties, and enhanced stability for a wide range of applications. Currently, the interactions between the conjugated organic building blocks and the metal halide inorganic building blocks have not been fully investigated. Herein, a series of bithiophene-based conjugated ligands with formamidinium, imidazolium, and benzimidazolium terminal groups to examine the influence of different anchoring groups on the crystal structures, phase formation, and device performances are reported. It is shown that the terminal groups of the ligands have significant effect on the interactions between ligands and octahedra in perovskites, thus determine the formation of the crystal structures. Only the 3D perovskite solar cells passivated by the ligands with imidazolium and benzimidazolium terminal groups exhibit enhancement in power conversion efficiencies as well as reduced hysteresis. A new strategy is provided for designing novel OSiPs structures and functionalities via tailoring the anchoring group.