[3PS-092]
Helical Electron Density and Enhanced Chiroptical Response in 1D Dion–Jacobson Chiral Perovskite Nanowires
발표자박종현 (서울대학교)
연구책임자오준학 (서울대학교)
Abstract
Chiral hybrid organic–inorganic perovskites (HOIPs) have attracted significant attention for their potential in spin resolved optoelectronic applications. Despite growing interest, most chiral HOIPs remain limited to Ruddlesden–Popper (RP) phase structures due to synthetic challenges associated with achieving chirality transfer to the perovskite framework. In this study, we introduce a novel 1D Dion–Jacobson (DJ) phase chiral perovskite using a biphenyl-based chiral diammonium ligand, (R/S)-BPBEA (1,1′-([1,1′-biphenyl]-4,4′-diyl)bis(ethan-1-aminium) iodide). The incorporation of this chiral ligand leads to the formation of a helical arrangement in the [PbI6]4- octahedral chains, forming highly ordered 1D nanowires. Importantly, the helical distortion of the Pb–I framework results in a spatially helical distribution of electron density along the nanowire axis. This structural feature enables efficient chirality transfer from the organic ligand to the inorganic backbone, significantly enhancing the chiroptical response, including circular dichroism. Compared to benzylamine-based chiral perovskites, the resulting DJ-phase system exhibits approximately 10 times stronger CD signals. Furthermore, the corresponding circularly polarized light photodetectors demonstrate high photocurrent dissymmetry factors (gPh) up to ~0.74, highlighting the potential of this design strategy for advanced chiral optoelectronic devices.