Intercalation-driven ferroelectric-to-ferroelastic conversion in a layered hybrid perovskite crystal

Zhenyue Wu, Shunning Li, Yasmin Mohamed Yousry, Walter P. D. Wong, Xinyun Wang, Teng Ma, Zhefeng Chen, Yan Shao, Weng Heng Liew, Kui Yao, Feng Pan () and Kian Ping Loh ()
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Zhenyue Wu: National University of Singapore
Shunning Li: Peking University Shenzhen Graduate School
Yasmin Mohamed Yousry: A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis
Walter P. D. Wong: National University of Singapore
Xinyun Wang: National University of Singapore
Teng Ma: National University of Singapore
Zhefeng Chen: Peking University Shenzhen Graduate School
Yan Shao: National University of Singapore
Weng Heng Liew: A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis
Kui Yao: A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis
Feng Pan: Peking University Shenzhen Graduate School
Kian Ping Loh: National University of Singapore

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Two-dimensional (2D) organic-inorganic hybrid perovskites have attracted intense interests due to their quantum well structure and tunable excitonic properties. As an alternative to the well-studied divalent metal hybrid perovskite based on Pb2+, Sn2+ and Cu2+, the trivalent metal-based (eg. Sb3+ with ns2 outer-shell electronic configuration) hybrid perovskite with the A3M2X9 formula (A = monovalent cations, M = trivalent metal, X = halide) offer intriguing possibilities for engineering ferroic properties. Here, we synthesized 2D ferroelectric hybrid perovskite (TMA)3Sb2Cl9 with measurable in-plane and out-of-plane polarization. Interestingly, (TMA)3Sb2Cl9 can be intercalated with FeCl4 ions to form a ferroelastic and piezoelectric single crystal, (TMA)4-Fe(iii)Cl4-Sb2Cl9. Density functional theory calculations were carried out to investigate the unusual mechanism of ferroelectric-ferroelastic crossover in these crystals.

Date: 2022
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DOI: 10.1038/s41467-022-30822-6

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