Zhou Lei, Liang Liangliang, Chen Jiaye, Zhou Xin, Liu Lingmei, Xi Shibo, Loh Kian Ping, Han Yu, He Qian, Liu Xiaogang
Department of Chemistry, National University of Singapore, Singapore, 117549, Singapore.
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519802, P. R. China.
Adv Sci (Weinh). 2024 Jan;11(3):e2306398. doi: 10.1002/advs.202306398. Epub 2023 Nov 28.
Precise control of exciton confinement in metal halide perovskites is critical to the development of high-performance, stable optoelectronic devices. A significant hurdle is the swift completion of ionic metathesis reactions, often within seconds, making consistent control challenging. Herein, the introduction of different steric hindrances in a Cs sublattice within CsYb F is reported, which effectively modulates the reaction rate of Cs with lead (Pb ) and halide ions in solution, extending the synthesis time for perovskite nanostructures to tens of minutes. Importantly, the Cs sublattice provides a crystal facet-dependent preference for perovskite growth and thus exciton confinement, allowing the simultaneous occurrence of up to six emission bands of CsPbBr . Moreover, the rigid CsYb F nano template offers high activation energy and enhances the stability of the resulting perovskite nanostructures. This methodology provides a versatile approach to synthesizing functional heterostructures. Its robustness is demonstrated by in-situ growth of perovskite nanostructures on Cs -mediated metal-organic frameworks.
精确控制金属卤化物钙钛矿中的激子限制对于高性能、稳定的光电器件的发展至关重要。一个重大障碍是离子复分解反应通常在几秒钟内迅速完成，这使得一致的控制具有挑战性。在此，报道了在CsYbF的Cs亚晶格中引入不同的空间位阻，这有效地调节了Cs与溶液中的铅（Pb）和卤离子的反应速率，将钙钛矿纳米结构的合成时间延长至数十分钟。重要的是，Cs亚晶格为钙钛矿生长提供了依赖于晶面的偏好，从而实现激子限制，使得CsPbBr能够同时出现多达六个发射带。此外，刚性的CsYbF纳米模板提供了高活化能并增强了所得钙钛矿纳米结构的稳定性。这种方法提供了一种合成功能性异质结构的通用方法。通过在Cs介导的金属有机框架上原位生长钙钛矿纳米结构证明了其稳健性。
