Publication date: 15th May 2025
In hybrid metal halide semiconductors based on the family of halide perovskites, chiroptical properties are typically induced from structural symmetry breaking by incorporating a chiral “A-site” organic cation within the structure. Restricting this to A-sites limits the compositional space. Another route involves highly efficient “remote chirality transfer” where chirality can be imposed on an otherwise achiral hybrid metal halide semiconductor by a proximal chiral molecule that is not interspersed as part of the structure yet leads to large circular dichroism dissymmetry factors (gCD) of up to 10−2. Density functional theory calculations reveal that the transfer of stereochemical information from the chiral proximal molecule to the inorganic framework is mediated by selective interaction with divalent metal cations. Anchoring of the chiral molecule induces a centro-asymmetric distortion, which is discernible four to five inorganic layers into the metal halide lattice, making this strategy very applicable to quantum dot forms with high surface to volume ratio. This concept is broadly applicable to low-dimensional hybrid metal halides with various dimensionalities (0D, 1D and 2D) allowing independent control of the composition and degree of chirality.
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