Xu Haojie, Guo Wuqian, Liu Yi, Ma Yu, Fan Qingshun, Tang Liwei, Li Wenjing, Ni Huaimin, Luo Junhua, Sun Zhihua
State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P.R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P.R. China.
Angew Chem Int Ed Engl. 2025 May;64(21):e202501238. doi: 10.1002/anie.202501238. Epub 2025 Mar 16.
Manipulating domain structure in ferroelectrics by external stimuli presents a fascinating avenue for new-generation electronic devices. However, multichannel controlling of ferroelectric domains is still a challenge, due to the lack of knowledge on their bistability to diverse physical stimuli. Herein, we have customized a series of perovskite ferroelectrics, (CHNH)(CHNH)PbBr (n = 2-7), of which the Curie temperatures are modulated in a wide temperature range (ΔT = 74 K) by tailoring chain length of organic spacers. Strikingly, the n = 7 member is a room-temperature ferroelectric with bistable characteristics, thus endowing the manipulation of domains via four channels (i.e., thermal, stress, light, and electric fields). Such a non-volatile memory behavior of the stress-switching domain is unprecedented in hybrid perovskite ferroelectrics. This manipulation of domains reveals the unique bistability of its ferroelectric orders, which sheds light on the future advance of customizing electric-ordered materials toward smart device applications.
通过外部刺激来调控铁电体中的畴结构为新一代电子器件提供了一条引人入胜的途径。然而，由于缺乏对铁电畴对多种物理刺激的双稳态的了解，对铁电畴的多通道控制仍然是一个挑战。在此，我们定制了一系列钙钛矿铁电体(CHNH)(CHNH)PbBr (n = 2 - 7)，通过调整有机间隔基的链长，其居里温度在很宽的温度范围内(ΔT = 74 K)得到调控。引人注目的是，n = 7的成员是一种具有双稳态特性的室温铁电体，从而能够通过四个通道(即热、应力、光和电场)对畴进行操控。这种应力切换畴的非易失性存储行为在混合钙钛矿铁电体中是前所未有的。这种对畴的操控揭示了其铁电序独特的双稳态，这为定制用于智能器件应用的电有序材料的未来发展提供了启示。
