Lorenzo Malavasi - Energy and Materials Chemistry Group (@malavasigroup.bsky.social)

Happy to share our latest paper where we reported a novel class of chiral hybrid metal halides showing a 3D interconnection and isotropic conductivity coupled to chiroptical properties | ACS Energy Letters @acs.org pubs.acs.org/doi/10.1021/...

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3D Chiral Metal Halide Semiconductors Chiral metal halides are promising materials for nonlinear optics and spin-selective devices. Typically, chirality is introduced via large chiral organic cations, leading to low-dimensional structures and limitations in charge transport. Here, we design a family of chiral metal halides based on the relatively small ditopic R/S-3-aminoquinuclidine (3-AQ) cation, forming an (R/S-3AQ)Pb2Br6 structure closely related to the 3D corner-sharing octahedral network of perovskites. The resulting material exhibits a direct bandgap, isotropic band structure, and fully 3D photoexcitation. Circular dichroism confirms a chiral anisotropy factor consistent with theoretical predictions. Moreover, the material displays a Rashba effect in the conduction band, which is attributed to spin–orbit coupling and the lack of inversion symmetry. Offering rich chemical tunability and efficient 3D charge transport, this new class of chiral semiconductors provides a promising platform for advancing nonlinear optoelectronic and spintronic devices. https://pubs.acs.org/doi/10.1021/acsenergylett.5c00576