Highly Controlled Zigzag Perovskite Nanocrystals Enabled by Dipole‐Induced Self‐Assembly of Nanocubes for Low‐Threshold Amplified Spontaneous Emission and Lasing
Chengxi Zhang, Jiayi Chen, Lyudmila Turyanska, Junhui Wang, Weihua Wang, Lin Wang, Lingmei Kong, Kaifeng Wu, Jisong Yao, Hong‐Bin Yao, Zhiwen Yang, Wanwan Li, Yehonadav Bekenstein, Yue Wang, Guohua Jia, Xuyong Yang
Abstract
Abstract Self‐assembly of nanocrystals into controlled structures while uncompromising their properties is one of the key steps in optoelectronic device fabrication. Herein, zigzag CsPbBr 3 perovskite nanocrystals are demonstrated with a precise number of components with nanocube morphology, these can be successfully obtained through a dipole‐induced self‐assembly process. The addition of a trace amount of deionized water facilitates the transfer from CsPbBr 3 nanocubes to intermediates of CsPb 2 Br 5 and Cs 3 In 2 Br 9 , which then fastly release reaction monomers leading to further homogenous nucleation of CsPbBr 3 nanocubes, followed by the formation of zigzag CsPbBr 3 nanocrystals through a dipole‐induced self‐assembly process. Dipole moment along <110> axis is found to be the driving force for the assembly of nanocubes into zigzag nanocrystals. The zigzag CsPbBr 3 nanocrystals exhibit desirable optical properties comparable to their nanocube counterparts and offer advantages for amplified spontaneous emission and lasing applications with low pump thresholds of 3.1 and 6.02 µJ cm −2 , respectively. This study not only develops a strategy for producing highly controlled zigzag perovskite nanocrystals and provides insights on the dipole‐induced self‐assembly mechanisms, but also opens an avenue for their application in lasing.