准二维钙钛矿中结晶调控与低阈值微纳激光器  

Crystallization Modulation and Low-threshold Micro/Nano Laser in Quasi-two-dimensional Perovskites

作　　者：高华兴 张红旗[1] 李璇[1] GAO Huaxing;ZHANG Hongqi;LI Xuan(China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]中国空间技术研究院,北京100094

出　　处：《材料导报》2024年第12期22-26,共5页Materials Reports

基　　金：吉林省科技发展计划项目(20190601043FG)。

摘　　要：准二维(Q-2D)钙钛矿由于大的激子结合能和量子限域作用,是一种可以应用于光电器件构筑的有前途的材料。然而,Q-2D钙钛矿是具有丰富晶界和界面的多相结构,在能量传递过程中导致非辐射损耗。本工作通过操纵不同n相的结晶动力学过程,实现了Q-2D钙钛矿中更高效的能量传递。通过在Q-2D钙钛矿前驱体中引入钠离子来实现对Q-2D钙钛矿成核和生长过程的操控。研究表明,钠离子的掺入促进高n相的成核,使不同n相在空间上更均匀地分布,寿命的表征证实该操作促进了能量的转移。得益于这种高效的能量传递过程,与普通薄膜体系的光放大阈值(23.3μJ·cm^(-2))相比,掺杂薄膜的光放大阈值降低至14.3μJ·cm^(-2)。该研究提供了一种有效的优化Q-2D钙钛矿光子学性能的新方法,从而进一步拓宽Q-2D钙钛矿的光子学应用范围。Quasi-two-dimensional(Q-2D)perovskite is a promising material that can be applied in novel optoelectronic devices due to its large exciton binding energy and quantum-confined effects.However,Q-2D perovskites exhibit multiphase structures with grain boundaries and interfaces,leading to non-radiative losses during energy transfer.In this work,we achieved a more efficient energy transfer in the Q-2D perovskite by regulating the crystallization kinetic processes in different n-phases.Control of the Q-2D perovskite nucleation and growth process was realized by introducing sodium ions into the Q-2D perovskite precursors.It is found that the incorporation of sodium ions promotes the nucleation of the high n-phase,making the different n-phases more evenly distributed in space,and the characterization of the lifetime confirms that sodium ions doping promotes energy transfer.Thanks to this efficient energy transfer process,the optical amplification threshold of doped films is decreased from 23.3μJ·cm^(-2)to 14.3μJ·cm^(-2).The results provide a new effective method to optimize the photonics properties of Q-2D perovskites,thus further broadening the range of photonics applications of Q-2D perovskites.

关 键 词：准二维钙钛矿 Na+掺杂 结晶调控 能量传递 微纳激光器 

分 类 号：TN201[电子电信—物理电子学]