Ligand-Driven Chirality in Perovskites for Advanced Optoelectronics

Chiral hybrid organic-inorganic perovskites (HOIPs) are gaining attention as multifunctional materials for circularly polarized light (CPL) detection and emission, spintronic applications, and emerging neuromorphic computing. Their performance hinges on the structural and electronic properties induced by chiral organic cations, which break inversion symmetry and modulate lattice distortion. This review presents a systematic overview of ligand engineering strategies─including aromatic, halogenated, polymerizable, and π-conjugated systems─and examines how ligand geometry, hydrogen bonding, and steric effects impact chiroptical properties. Additionally, we discuss recent advances in device architectures that exploit chiral HOIPs, such as two-photon-responsive photodetectors, spin-filtering interfaces, and CPL-responsive synaptic devices. External modulation of chirality via strain or surface anchoring is also highlighted as a tool for enhancing device performance. This review provides molecular-level design insights to advance the development of high-performance chiral optoelectronic systems.