Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.192
Publication date: 16th December 2024
By combining the optoelectronic properties of halide perovskites (HPs) with chirality from inserted organic cations, chiral HPs brought new perspectives for chiroptical properties, such as non-linear optics or circularly polarized luminescence (CPL), or spintronic devices such as spin valves or spin-LEDs. Indeed, the emergent field of chiro-spintronics proposes to use chiral molecules as a substitute for ferromagnetic materials thanks to the spin-specific interaction between electrons and chiral molecules, a phenomenon called CISS, “chirality-induced spin selectivity”. Following this strategy, we prepared a series of chiral HPs and revealed both experimentally (mc-AFM) and theoretically (band structure and spin texture calculations) the influence of crystal symmetry elements on the spin polarization ability of this family of molecular materials (Figure a).[1] We also demonstrated the possibility to use such materials as spin valves. More recently, we reported a full series of lead-free chiral double perovskites showing strong structural distortions in the inorganic network.[2] In combination with their lead-based counterparts, such series will ultimately allow us to investigate the fundamental role of the metal ions on the CISS effect. On the other hand, revealing the ability of chiral HPs for chiroptical applications require a proper characterization of the thin film chiroptical responses, in particular circular dichroism (CD), considering the macroscopic interferences (linear dichroism LD, linear birefringence LB) inherent to solid-state samples, leading to the so-called antisymmetric LDLB effect (aLDLB) and symmetric LDLB effect (sLDLB). Since these macroscopic effects can be very strong in highly crystalline metal-halide thin films, an experimental guide to accurately discriminate between both CD, aLDLB and sLDLB was recently reported with the example of 1D chiral lead-halide networks.[3] However, in compounds with large optical anisotropy, such effects can be minimized by controlling the orientation of the polar axis with respect to the light beam propagation (Figure b). This strategy allowed us to characterize artefact-free CPL on both single crystals and thin films of 1D chiral lead-bromides with white-light emission (manuscript under revision).
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