Publication date: 15th December 2025
The quest for sustainable and non-toxic alternatives to lead-based perovskites has led to growing interest in lead-free chiral metal halides (CMHs) — a class of materials that combine structural chirality with tunable optoelectronic properties. These compounds, including both perovskite and perovskite-inspired materials, often incorporating metals such as bismuth, antimony, or copper, exhibit intrinsic circular dichroism, second-harmonic generation (SHG), and spin-selective charge transport, making them highly attractive for next-generation applications in chiroptoelectronics, nonlinear optics, and spintronics. In this work, we present the synthesis, crystallographic characterization, and photophysical behavior of several new lead-free CMHs, highlighting the role of metal center and chiral organic ligands in dictating crystal symmetry and electronic structure. Optical spectroscopy and polarization-dependent measurements reveal strong chiroptical responses and promising excitonic dynamics at room temperature. Furthermore, we discuss structure–property relationships and design principles aimed at enhancing their stability, light-harvesting efficiency, and spin filtering capabilities.Our findings demonstrate that lead-free CMHs offer a viable and environmentally benign platform for multifunctional materials design, bridging the gap between molecular chirality and solid-state photophysics.
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