通过FAPbBr的局域晶格扩展设计用于灵敏近红外光探测的3D混合钙钛矿
Localized Lattice Expansion of FAPbBr to Design a 3D Hybrid Perovskite for Sensitive Near-Infrared Photodetection.
作者信息
Ji Chengmin, Zhu Tingting, Fan Yipeng, Li Zhou, Liu Xitao, Li Lina, Sun Zhihua, Luo Junhua
机构信息
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China.
出版信息
Angew Chem Int Ed Engl. 2022 Nov 21;61(47):e202213294. doi: 10.1002/anie.202213294. Epub 2022 Oct 25.
A mixed-cation 3D lead bromide hybrid perovskite (NMDAP) FAPb Br (1, NMDAP = N-methyl-1,3-diaminopropanium, FA = formamidinium) is tailored by incorporating the large NMDAP cation with the small FA ion into 3D FAPbBr . Structurally, the small FA ions occupy the prototypical cavities formed by distorted corner-sharing PbBr octahedra as in FAPbBr , while the bulky NMDAP ions are confined to the expanded lattice which is defined by a new structural motif composed of eight corner-sharing PbBr octahedra and four edge-sharing octahedra. This localized lattice expansion from FAPbBr creates a new branch of the intriguing 3D hybrid perovskite family, breaking the limits of the conventional Goldschmidt tolerance factor rule. Moreover, a high two-photon absorption (2AP) coefficient of 60.8 cm MW was demonstrated to near-infrared (NIR) 800 nm illumination, enabling sensitive NIR photoresponses with large on/off ratio (≈10 ) as well as favorable stability.
一种混合阳离子三维溴化铅杂化钙钛矿（NMDAP）FAPbBr₃（1，NMDAP = N-甲基-1,3-二氨基丙烷鎓，FA = 甲脒鎓）是通过将大尺寸的NMDAP阳离子与小尺寸的FA离子引入三维FAPbBr₃中而制备的。在结构上，小尺寸的FA离子占据了如FAPbBr₃中由扭曲的共角PbBr₆八面体形成的典型空腔，而体积较大的NMDAP离子则被限制在由八个共角PbBr₆八面体和四个共边八面体组成的新结构基序所定义的扩展晶格中。这种相对于FAPbBr₃的局部晶格扩展创造了一个有趣的三维杂化钙钛矿家族的新分支，打破了传统的戈尔德施密特容忍因子规则的限制。此外，在近红外（NIR）800 nm光照下，该材料展现出高达60.8 cm⁻¹MW⁻¹的高二光子吸收（2PA）系数，实现了具有大开关比（≈10³）以及良好稳定性的灵敏近红外光响应。
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