Pressure driven rotational isomerism in 2D hybrid perovskites

Tingting Yin (), Hejin Yan, Ibrahim Abdelwahab, Yulia Lekina, Xujie Lü, Wenge Yang, Handong Sun, Kai Leng, Yongqing Cai (), Ze Xiang Shen () and Kian Ping Loh ()
Additional contact information
Tingting Yin: Nanyang Technological University
Hejin Yan: University of Macau
Ibrahim Abdelwahab: National University of Singapore
Yulia Lekina: Nanyang Technological University
Xujie Lü: Center for High Pressure Science and Technology Advanced Research, (HPSTAR)
Wenge Yang: Center for High Pressure Science and Technology Advanced Research, (HPSTAR)
Handong Sun: Nanyang Technological University
Kai Leng: The Hong Kong Polytechnic University, Hung Hom
Yongqing Cai: University of Macau
Ze Xiang Shen: Nanyang Technological University
Kian Ping Loh: National University of Singapore

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Multilayers consisting of alternating soft and hard layers offer enhanced toughness compared to all-hard structures. However, shear instability usually exists in physically sputtered multilayers because of deformation incompatibility among hard and soft layers. Here, we demonstrate that 2D hybrid organic-inorganic perovskites (HOIP) provide an interesting platform to study the stress–strain behavior of hard and soft layers undulating with molecular scale periodicity. We investigate the phonon vibrations and photoluminescence properties of Ruddlesden–Popper perovskites (RPPs) under compression using a diamond anvil cell. The organic spacer due to C4 alkyl chain in RPP buffers compressive stress by tilting (n = 1 RPP) or step-wise rotational isomerism (n = 2 RPP) during compression, where n is the number of inorganic layers. By examining the pressure threshold of the elastic recovery regime across n = 1–4 RPPs, we obtained molecular insights into the relationship between structure and deformation resistance in hybrid organic-inorganic perovskites.

Date: 2023
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DOI: 10.1038/s41467-023-36032-y

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