Duan Jianing, Li Jingrui, Divitini Giorgio, Cortecchia Daniele, Yuan Fang, You Jiaxue, Liu Shengzhong Frank, Petrozza Annamaria, Wu Zhaoxin, Xi Jun
Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, School of Electronic Science and Engineering & International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an, 710049, China.
Adv Mater. 2024 Jul;36(30):e2403455. doi: 10.1002/adma.202403455. Epub 2024 May 21.
2D perovskites have received great attention recently due to their structural tunability and environmental stability, making them highly promising candidates for various applications by breaking property bottlenecks that affect established materials. However, in 2D perovskites, the complicated interplay between organic spacers and inorganic slabs makes structural analysis challenging to interpret. A deeper understanding of the structure-property relationship in these systems is urgently needed to enable high-performance tunable optoelectronic devices. Herein, this study examines how structural changes, from constant lattice distortion and variable structural evolution, modeled with both static and dynamic structural descriptors, affect macroscopic properties and ultimately device performance. The effect of chemical composition, crystallographic inhomogeneity, and mechanical-stress-induced static structural changes and corresponding electronic band variations is reported. In addition, the structure dynamics are described from the viewpoint of anharmonic vibrations, which impact electron-phonon coupling and the carriers' dynamic processes. Correlated carrier-matter interactions, known as polarons and acting on fine electronic structures, are then discussed. Finally, reliable guidelines to facilitate design to exploit structural features and rationally achieve breakthroughs in 2D perovskite applications are proposed. This review provides a global structural landscape of 2D perovskites, expected to promote the prosperity of these materials in emerging device applications.
二维钙钛矿因其结构可调性和环境稳定性，近年来受到了广泛关注，通过突破影响现有材料的性能瓶颈，使其成为各种应用中极具潜力的候选材料。然而，在二维钙钛矿中，有机间隔层和无机板层之间复杂的相互作用使得结构分析难以解释。迫切需要更深入地了解这些体系中的结构-性能关系，以实现高性能的可调谐光电器件。在此，本研究考察了通过静态和动态结构描述符建模的恒定晶格畸变和可变结构演化所导致的结构变化如何影响宏观性能以及最终的器件性能。报告了化学成分、晶体学不均匀性以及机械应力诱导的静态结构变化和相应的电子能带变化的影响。此外，从非谐振动的角度描述了结构动力学，非谐振动会影响电子-声子耦合和载流子的动态过程。接着讨论了与载流子-物质相互作用相关的极化子，其作用于精细的电子结构。最后，提出了可靠的指导方针，以促进利用结构特征进行设计，并在二维钙钛矿应用中合理实现突破。本综述提供了二维钙钛矿的整体结构概况，有望推动这些材料在新兴器件应用中的繁荣发展。
