Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.212
Publication date: 16th December 2024
Coupling chiral organic cations with the inorganic skeleton of perovskites is paving the way for new materials combining the second-order non-linear optical responses granted by the chiral molecules [1] and the modulable absorption and luminescence features settled by the perovskite or perovskite-derivative structures [2,3]. The heightened flexibility of design permitted by the vastity of available chemical constituents allows creating materials where the structural and functional parameters can be engineered, resulting in elevated circular dichroism, tunable photoluminescence, elevated spin selectivity, and more. Within this growing field, a deep understanding of how chemical composition and structural parameters impact on photophysical properties and chirality transfer mechanism is crucial, and parameters such as framework dimensionality, octahedral distortion and hydrogen bond network must be taken into account.
In this perspective, the current presentation will focus on novel hybrid organic inorganic perovskites (HOIPs) and their derivatives, attained through a rational tuning of the components to evaluate its impact on crystal structure and chiroptical properties. The effect of materials dimensionality on the chiral response will be discussed, including examples of 3D HOIPs derivatives which are not common due to the steric constrains of chiral cations. The metal centres impact on octahedra distortion, bandgap and chiroptical features will be examined, reporting results from our group with cations such as SnII and GeII in addition to the well-known PbII. The chiral cations modulation will also be presented, exploring molecules with mixed functionalities, i.e. simultaneously containing amino and hydroxyl groups, synthesized ad hoc to move away from the few commercially available ones. Finally, high-pressure studies unveiling the structural and optical response of chiral HOIPs upon external stimuli will be outlined.
This work has been supported by Fondazione Cariplo, grant n° 2023-1246.
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