Elucidating the origin of chiroptical activity in chiral 2D perovskites through nano-confined growth

Sunihl Ma, Young-Kwang Jung, Jihoon Ahn, Jihoon Kyhm, Jeiwan Tan, Hyungsoo Lee, Gyumin Jang, Chan Uk Lee, Aron Walsh and Jooho Moon ()
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Sunihl Ma: Yonsei University
Young-Kwang Jung: Yonsei University
Jihoon Ahn: Yonsei University
Jihoon Kyhm: Institute of Science and Technology
Jeiwan Tan: Yonsei University
Hyungsoo Lee: Yonsei University
Gyumin Jang: Yonsei University
Chan Uk Lee: Yonsei University
Aron Walsh: Yonsei University
Jooho Moon: Yonsei University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Chiral perovskites are being extensively studied as a promising candidate for spintronic- and polarization-based optoelectronic devices due to their interesting spin-polarization properties. However, the origin of chiroptical activity in chiral perovskites is still unknown, as the chirality transfer mechanism has been rarely explored. Here, through the nano-confined growth of chiral perovskites (MBA2PbI4(1-x)Br4x), we verified that the asymmetric hydrogen-bonding interaction between chiral molecular spacers and the inorganic framework plays a key role in promoting the chiroptical activity of chiral perovskites. Based on this understanding, we observed remarkable asymmetry behavior (absorption dissymmetry of 2.0 × 10−3 and anisotropy factor of photoluminescence of 6.4 × 10−2 for left- and right-handed circularly polarized light) in nanoconfined chiral perovskites even at room temperature. Our findings suggest that electronic interactions between building blocks should be considered when interpreting the chirality transfer phenomena and designing hybrid materials for future spintronic and polarization-based devices.

Date: 2022
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DOI: 10.1038/s41467-022-31017-9

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