发表机构
Monash University; University of Oxford（莫纳什大学; 牛津大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在非极性钙钛矿CsPbBr3中发现层级人字形极性壁网络，由铁弹孪晶壁和反相壁组成，通过原位加热实验揭示了其不同于氧化物钙钛矿的依次形成路径，可能影响载流子输运，为光物理和光电行为提供新见解。
AI 中文摘要
铁性材料中的畴壁可以承载周期性晶体中不存在的纳米尺度功能，为控制半导体器件中的电子输运和极化提供了新的机会。金属卤化物钙钛矿展现出重要的光物理性质；然而，其铁性性质仍不清楚。在此，我们发现了非极性卤化物钙钛矿CsPbBr3中由铁弹孪晶壁和反相壁组成的层级人字形极性壁网络。原子尺度成像揭示，两种类型的壁均包含与周围体晶格相比反转对称性被破坏的纳米尺度区域。原位加热实验表明，这些界面在对称性降低的相变过程中依次形成，揭示了与“传统”氧化物钙钛矿不同的形成路径。这些极性纳米壁及其封闭拓扑结构可能影响载流子输运。这揭示了CsPbBr3中一种先前未被识别的结构基元，为其光物理和光电行为提供了新的见解。
英文摘要
Domain walls in ferroic materials can host nanoscale functionalities absent from the periodic crystal, offering new opportunities to control electronic transport and polarization in semiconductor devices. Metal halide perovskites demonstrate important photophysical properties; however, their ferroic properties remain unclear. Here we discover a hierarchical herringbone network of polar walls within the non-polar halide perovskite CsPbBr3 comprising ferroelastic twin walls and antiphase walls. Atomic-scale imaging reveals that both wall types comprise nanoscale regions whose inversion-symmetry is broken compared to the surrounding bulk lattice. In-situ heating experiments show that these interfaces form sequentially during symmetry-lowering phase transitions, revealing a different formation pathway compared with 'conventional' oxide perovskites. These polar nano-walls, together with their enclosed topology, may impact carrier transport. This reveals a previously unrecognized structural motif in CsPbBr3, providing new insights into their photophysical and optoelectronic behavior.
Comments11 pages, 5 figures
