Colloid driven low supersaturation crystallization for atomically thin Bismuth halide perovskite

• Published in: Nature communications 2023-06, Vol.14 (1), p.3764-3764, Article 3764
• Main Authors: Li, Lutao, Yao, Junjie, Zhu, Juntong, Chen, Yuan, Wang, Chen, Zhou, Zhicheng, Zhao, Guoxiang, Zhang, Sihan, Wang, Ruonan, Li, Jiating, Wang, Xiangyi, Lu, Zheng, Xiao, Lingbo, Zhang, Qiang, Zou, Guifu
• Format: Article
• Language: English
• Subjects: 140/125; 140/133; 140/146; 147/143; 147/3; 639/301/357; 639/638/298; Bismuth; Bismuth halides; Calcium Compounds; Chemical bonds; Colloids; Coupling; Crystal growth; Crystallization; Crystals; Energy; Humanities and Social Sciences; Inorganic Chemicals; multidisciplinary; Nonlinear optics; Nucleation; Perovskites; Quantum dots; Science; Science (multidisciplinary); Second harmonic generation; Single crystals; Supersaturation; Surfactants
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-023-39445-x

It is challenging to grow atomically thin non-van der Waals perovskite due to the strong electronic coupling between adjacent layers. Here, we present a colloid-driven low supersaturation crystallization strategy to grow atomically thin Cs 3 Bi 2 Br 9 . The colloid solution drives low-concentration solute in a supersaturation state, contributing to initial heterogeneous nucleation. Simultaneously, the colloids provide a stable precursor source in the low-concentration solute. The surfactant is absorbed in specific crystal nucleation facet resulting in the anisotropic growth of planar dominance. Ionic perovskite Cs 3 Bi 2 Br 9 is readily grown from monolayered to six-layered Cs 3 Bi 2 Br 9 corresponding to thicknesses of 0.7, 1.6, 2.7, 3.6, 4.6 and 5.7 nm. The atomically thin Cs 3 Bi 2 Br 9 presents layer-dependent nonlinear optical performance and stacking-induced second harmonic generation. This work provides a concept for growing atomically thin halide perovskite with non-van der Waal structures and demonstrates potential application for atomically thin single crystals’ growth with strong electronic coupling between adjacent layers. It is challenging to grow atomically thin non-van der Waals perovskites due to strong electronic coupling between adjacent layers. Here authors present the growth of perovskite single crystal nanosheets using a low supersaturation crystallisation strategy.