超顺磁性
顺磁性
材料科学
钙钛矿(结构)
抗磁性
八面体
结晶学
旋转
Crystal(编程语言)
凝聚态物理
晶体结构
化学
磁化
物理
磁场
量子力学
计算机科学
程序设计语言
作者
Ji‐Hyun Cha,Hyun‐Jong Lee,Sun Ha Kim,Kyoung Chul Ko,B. J. Suh,Oc Hee Han,Dongsoo Jung
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-06-08
卷期号:5 (7): 2208-2216
被引量:31
标识
DOI:10.1021/acsenergylett.0c00964
摘要
We report the characteristic magnetic behaviors of nonemissive (N416) and green emissive (G416) Cs4PbBr6 perovskite crystals. N416 exhibits a diamagnetic behavior, while G416 shows an additional superparamagnetic behavior, demonstrating the existence of paramagnetic electron spins in the G416. Although G416 and N416 crystals belong to the same rhombohedra unit cell with zero-dimensional (0D) connectivity of the [PbBr6]4– octahedron, the G416 crystal has a smaller unit cell volume than N416. 133Cs magic-angle-spinning NMR spectroscopy demonstrated the presence of defects in G416 and the extremely low concentration of a CsPbBr3 phase in both crystals. The DFT calculation results for the defected N416 crystal structure possessing Br vacancies included the experimentally observed blue shift of the high-energy optical band in the G416, which reinforces the existence of intrinsic defects in the G416. Our findings reveal that the unusual green emission and paramagnetic domains stem from structural defects in the 0D perovskites.
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