Chemical Availability of Bromide Dictates CsPbBr3 Nanocrystal Growth

被引:34
作者
Wen, Je-Ruei [1 ]
Roman, Benjamin J. [1 ]
Ortiz, Freddy A. Rodriguez [1 ]
Villegas, Noel Mireles [1 ]
Porcellino, Nicholas [1 ]
Sheldon, Matthew [1 ,2 ]
机构
[1] Texas A&M Univ, Dept Chem, College Stn, TX 77843 USA
[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA
关键词
CESIUM LEAD HALIDE; PEROVSKITE NANOCRYSTALS; I NANOCRYSTALS; STRUCTURAL TRANSFORMATIONS; COLLOIDAL SYNTHESIS; CSPBX3; X; BR; CI; CL; NUCLEATION;
D O I
10.1021/acs.chemmater.9b03709
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lack of detailed understanding of the growth mechanism of CsPbBr3 nanocrystals has hindered sophisticated morphological and chemical control of this important emerging optoelectronic material. Here, we have elucidated the growth mechanism by slowing the reaction kinetics. When 1-bromohexane is used as an alternative halide source, bromide is slowly released into the reaction mixture, extending the reaction time from similar to 3 s to greater than 20 min. This enables us to monitor the phase evolution of products over the course of reaction, revealing that CsBr is the initial species formed, followed by Cs4PbBr6, and finally CsPbBr3. Furthermore, formation of monodisperse CsBr nanocrystals is demonstrated in a bromide-deficient and lead-abundant solution. The CsBr can be transformed only into CsPbBr3 nanocubes if additional bromide is added. Our results indicate a fundamentally different growth mechanism for CsPbBr3 in comparison with more established semiconductor nanocrystal systems and reveal the critical role of the chemical availability of bromide for the growth reactions.
引用
收藏
页码:8551 / 8557
页数:7
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