Dimensional control of chiral perovskites for high-performance circularly polarized light detection via ligand engineering

Chiral hybrid organic-inorganic perovskites (HOIPs), embedded with chiral organic cations, have emerged as promising materials for optoelectronic devices due to their unique circularly polarized light (CPL) discrimination properties. However, the function of chiral organic ligands, which are the origin of chirality and simultaneously the structural building block in HOIPs, has not been thoroughly explored beyond commercially available amines. Here, we synthesized three phenyl-based chiral organic cations with different substitution positions (ortho, meta and para) of chlorine atom, which influenced hydrogen bonding geometries within the HOIP’s inorganic framework. Notably, controlling molecular interactions resulted in a change in dimensionality and an enhancement in the chiroptical properties of perovskite crystals, exhibiting the exceptional anisotropy factors of up to 1.25 in a self-p…