奥斯特瓦尔德成熟
成核
纳米晶
材料科学
超晶格
钙钛矿(结构)
化学物理
散射
晶体生长
化学工程
卤化物
同步加速器
纳米技术
同步辐射
结晶学
光电子学
化学
光学
无机化学
物理
有机化学
工程类
作者
Zhiqiang Qiao,Xiao Wang,Yufeng Zhai,Runze Yu,Faming Zhu,Gang Chen
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-11-20
卷期号:23 (23): 10788-10795
标识
DOI:10.1021/acs.nanolett.3c02908
摘要
All-inorganic cesium lead halide perovskite nanocrystals (NCs) have received much attention due to their outstanding optical and electronic properties, but the underlying growth mechanism remains elusive due to their rapid formation process. Here, we report an in situ real-time study of the growth of Cs4PbBr6 NCs under practical synthesis conditions in a custom-made reactor. Through the synchrotron-based small-angle X-ray scattering technique, we find that the formation of Cs4PbBr6 NCs is accomplished in three steps: the fast nucleation process accompanied by self-focusing growth, the subsequent diffusion-limited Ostwald ripening, and the self-assembly of NCs into the face-centered cubic (fcc) superlattices at high temperature and the termination of growth. The simultaneously collected wide-angle X-ray scattering signals further corroborate the three-step growth model. The influence of superlattice formation is also elucidated, which improves the uniformity of the final NCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI