Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Kavli Energy NanoScience Institute , Berkeley, California 94720, United States.
Nano Lett. 2017 Sep 13;17(9):5489-5494. doi: 10.1021/acs.nanolett.7b02146. Epub 2017 Aug 10.
A Ruddlesden-Popper (RP) type structure is well-known in oxide perovskites and is related to many interesting properties such as superconductivity and ferroelectricity. However, the RP phase has not yet been discovered in inorganic halide perovskites. Here, we report the direct observation of unusual structure in two-dimensional CsPbBr nanosheets which could be interpreted as the RP phase based on model simulations. Structural details of the plausible RP domains and domain boundaries between the RP and conventional perovskite phases have been revealed on the atomic level using aberration-corrected scanning transmission electron microscopy. The finding marks a major advance toward future inorganic halide RP phase synthesis and theoretical modeling, as well as unraveling their structure-property relationship.
Ruddlesden-Popper（RP）型结构在氧化物钙钛矿中广为人知，与超导性和铁电性等许多有趣的性质有关。然而，RP 相尚未在无机卤化物钙钛矿中发现。在这里，我们报告了在二维 CsPbBr 纳米片中异常结构的直接观察，该结构可以基于模型模拟解释为 RP 相。使用相衬校正扫描透射电子显微镜在原子水平上揭示了 RP 相和传统钙钛矿相之间的可能 RP 畴和畴界的结构细节。这一发现标志着朝着未来无机卤化物 RP 相合成和理论建模以及揭示其结构-性能关系迈出了重要一步。
