Zhang Han-Yue, Song Xian-Jiang, Chen Xiao-Gang, Zhang Zhi-Xu, You Yu-Meng, Tang Yuan-Yuan, Xiong Ren-Gen
Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, People's Republic of China.
Ordered Matter Science Research Center, Nanchang University, Nanchang 330031, People's Republic of China.
J Am Chem Soc. 2020 Mar 11;142(10):4925-4931. doi: 10.1021/jacs.0c00371. Epub 2020 Feb 28.
Topological defects, such as vortices and skyrmions, provide a wealth of splendid possibilities for new nanoscale devices because of their marvelous electronic, magnetic, and mechanical behaviors. Recently, great advances have been made in the study of the ferroelectric vortex in conventional perovskite oxides, such as BaTiO and BiFeO. Despite extensive interest, however, no intriguing ferroelectric vortex structures have yet been found in organic-inorganic hybrid perovskites (OIHPs), which are desirable for their mechanical flexibility, ease of fabrication, and low acoustical impedance. We observed the robust vortex-antivortex topological configurations in a two-dimensional (2D) layered OIHP ferroelectric (4,4-DFPD)PbI (4,4-DFPD is 4,4-difluoropiperidinium). This provides future directions for the study of perovskites and makes it a promising alternative for nanoscale ferroelectric devices in medical, micromechanical, and biomechanical applications.
诸如涡旋和斯格明子等拓扑缺陷，因其奇妙的电学、磁学和力学行为，为新型纳米级器件提供了众多绝佳的可能性。近来，在传统钙钛矿氧化物（如BaTiO和BiFeO）中铁电涡旋的研究方面取得了重大进展。然而，尽管人们兴趣浓厚，但在有机-无机杂化钙钛矿（OIHPs）中尚未发现有趣的铁电涡旋结构，而OIHPs因其机械柔韧性、易于制造和低声阻抗而备受青睐。我们在二维（2D）层状OIHP铁电体（4,4-DFPD）PbI（4,4-DFPD为4,4-二氟哌啶鎓）中观察到了稳健的涡旋-反涡旋拓扑构型。这为钙钛矿的研究提供了未来方向，并使其成为医学、微机械和生物力学应用中纳米级铁电器件的有前途的替代材料。
