Citation: Qian-Jun Gu, Run-Zhi Zhang, Rao Ma, Ya-Juan Li, Peng-Peng Gong, Yi Guo, Bo Huang, Ai-Xin Zhu. Large vertical spontaneous polarization and strong second harmonic generation in a layered perovskite ferroelectric[J]. Chinese Chemical Letters, ;2026, 37(12): 111559. doi: 10.1016/j.cclet.2025.111559 shu

Large vertical spontaneous polarization and strong second harmonic generation in a layered perovskite ferroelectric

Yunnan Key Laboratory of Modern Separation Analysis and Substance Transformation, College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, China

huangbo@ynnu.edu.cn

zaxchem@126.com

Received Date: 26 May 2025
Revised Date: 28 June 2025
Accepted Date: 8 July 2025
Available Online: 9 July 2025

Figures(7)

Ferroelectrics are highly desirable for their potential applications in the fields of optoelectronic sensors, energy conversion, and memorizers. The discovery of two-dimensional ferroelectrics with vertical polarization presents an ideal platform to miniaturize the smart devices. Herein, we demonstrate a new two-dimensional organic–inorganic hybrid layered perovskite, (2-F-C₆H₄CH₂CH₂NH₃)₂[CdCl₄], which exhibits a rare flipping and twisting ferroelectric phase transition at near room temperature (295/298 K), accompany by an unusual frequency-dependent dielectric behaviour, strong second harmonic generation intensity (2.75 times of KH₂PO₄), and a large vertical spontaneous polarization (9.45 μC/cm²) with a low coercive electric field (1.07 kV/cm). This work throws light on the exploration of two-dimensional hybrid layered perovskite ferroelectrics for applications in the field of multifunctional devices.
- Organic-inorganic hybrids,
- Layered perovskites,
- Second harmonic generation,
- Ferroelectrics,
- Vertical polarization
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