Cheng Ling, Cao Yingjie
College of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China.
Acta Crystallogr C Struct Chem. 2019 Mar 1;75(Pt 3):354-358. doi: 10.1107/S2053229619001712. Epub 2019 Feb 21.
Recently, with the prevalence of `perovskite fever', organic-inorganic hybrid perovskites (OHPs) have attracted intense attention due to their remarkable structural variability and highly tunable properties. In particular, the optical and electrical properties of organic-inorganic hybrid lead halides are typical of the OHP family. Besides, although three-dimensional hybrid perovskites, such as [CHNH]PbX (X = Cl, Br or I), have been reported, the development of new organic-inorganic hybrid semiconductors is still an area in urgent need of exploration. Here, an organic-inorganic hybrid lead halide perovskite is reported, namely poly[(2-azaniumylethyl)trimethylphosphanium [tetra-μ-bromido-plumbate(II)]], {(CHNP)[PbBr]}, in which an organic cation is embedded in inorganic two-dimensional (2D) mesh layers to produce a sandwich structure. This unique sandwich 2D hybrid perovskite material shows an indirect band gap of ∼2.700 eV. The properties of this compound as a semiconductor are demonstrated by a series of optical characterizations and indicate potential applications for optical devices.
最近，随着“钙钛矿热”的盛行，有机-无机杂化钙钛矿（OHPs）因其显著的结构多样性和高度可调谐的性质而备受关注。特别是，有机-无机杂化卤化铅的光学和电学性质是OHP家族的典型代表。此外，尽管已经报道了三维杂化钙钛矿，如[CHNH]PbX（X = Cl、Br或I），但新型有机-无机杂化半导体的开发仍然是一个急需探索的领域。在此，报道了一种有机-无机杂化卤化铅钙钛矿，即聚[(2-氨乙基)三甲基鏻[四-μ-溴化铅(II)]]，{(CHNP)[PbBr]}，其中有机阳离子嵌入无机二维（2D）网状层中以产生夹心结构。这种独特的夹心二维杂化钙钛矿材料显示出约2.700 eV的间接带隙。通过一系列光学表征证明了该化合物作为半导体的性质，并表明其在光学器件中的潜在应用。
