The Polymer Society of Korea

Abstract

Chiral perovskites are promising platforms for circularly polarized optical responses and spin-selective charge transport, yet a critical gap remains between crystallographic structure and device-relevant chiroptical performance. Despite numerous reports, a clear structural descriptor that directly links chirality at the atomic scale to optoelectronic functionality has been lacking.
Here, we address this challenge by introducing a one-dimensional Dion–Jacobson (DJ) chiral perovskite crystallizing in the R32 space group, which reveals the structural origin of amplified chirality. The material is constructed using a newly designed chiral diammonium ligand, (R,R)-/(S,S)-([1,1′-biphenyl]-4,4′-diyl)bis(ethan-1-amine) (BPBEA), which integrates two chiral methylbenzylamine motifs within a rigid biphenyl framework. Single-crystal X-ray diffraction combined with 2F_O–F_C electron density Fourier mapping directly visualizes a helical distribution of Pb atoms along the one-dimensional transport direction. This enables the establishment of a quantitative helicity criterion for 1D perovskites, providing a direct structural link to chiroptical strength.
As a result, the material exhibits exceptional chiroptical performance, achieving g_CD values of 0.045 and −0.042, surpassing the 0.01 benchmark and exceeding previously reported chiral perovskites. Moreover, handedness-selective photodetection is demonstrated, with a responsivity of 10.1 mA W^-1, a detectivity of 3.1 X 10¹¹ Jones, and a photocurrent dissymmetry factor (g_ph) of 0.6. These results establish structural helicity as a decisive design parameter for high-performance chiral optoelectronic device.