Structural Engineering for Chirality-Induced Spin Control in Metal–Halide Perovskites

Metal-halide perovskites, due to their tunable lattice structures and chemical compositions, present a promising platform for manipulating spin-related physical properties, crucial for next-generation spintronic devices. Specifically, the introduction of structural asymmetry through chiral organic and inorganic components in these perovskites leads to intrinsic spin-splitting effects by incorporating chirality directly into their electronic band structure. From a structural engineering perspective, the magnitude of this spin splitting is directly influenced by asymmetric interactions, such as hydrogen bonding and electrostatic forces, which effectively break inversion symmetry at both local and global scales. This review systematically explores the fundamental structure-property relationships in chiral perovskites, focusing on how precise structural engineering enables enhanced spin control. We provide comprehensive insights into rational design strategies, including tailoring chiral ligand setups, optimizing metal-halide framework compositions, adjusting material dimensionality, and fabricating self-assembled superstructures. We then critically discuss how these structural modifications impact key spin-dependent processes, laying the groundwork for practical applications. Finally, we address the critical challenges in material improvement and device-level implementation, paving the way for the realization of efficient, room-temperature chiral perovskite spintronic systems.