Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.384
Publication date: 16th December 2024
Chiral hybrid organic–inorganic metal halides, including low-dimensional perovskites, showing peculiar nonlinear optical and spin-dependent properties, are triggering a huge interest for their potential use in different applicative areas such as chiroptoelectronics and spintronics. In addition, their intrinsic noncentrosymmetric structure may be exploited in ferroelectric and piezoelectric devices. To date, the number of chiral systems is growing very quickly, and among the different structures reported, 2D chiral perovskites represent the vast majority. However, the structural family of chiral metal halides extends well beyond 2D perovskites and includes several 0D and 1D systems as well as 3D and quasi-2D motifs, which have been prepared using the commercially available chiral amines. As for other metal halide perovskites and low-dimensional systems, a wide range of tuning strategies can be put in place to modulate the (chiro)optical properties also going beyond Pb-based materials. In this presentation, we will show the recent progress of our group in the design of novel chiral metal halides making use of: i) chiral cation modulation (also considering ad-hoc synthesized cations); ii) modulation of B-site metal (i.e., Sn. Ge, Bi, Sb, Cu, Ni, Mn); and iii) halide substitution. The range of structural motifs arising by playing with "chemical degrees of freedom" is huge, providing also novel crystal structures not yet observed in current chiral (and achiral) metal halides. This work on the chemical modulation allows to understand which are the parameters mostly affecting the chiroptical properties of chiral metal halides thus paving the way for a rational design of novel materials [1-3].
L.M. acknowledges support from the Italian Ministry of University and Research through the program “Dipartimenti di Eccellenza 2023–2027″, PRIN 2022 Grant No 2022F2K7J5 with the title Two-dimensional chiral hybrid organic–inorganic perovskites for chiroptoelectronics (MIRROR)─CUP B53D23004130006.
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