POS5-0951
Impact of π-Extended Thiophene-Based Ligands with Varying Halogen Substituents on the Chiroptical Properties of Chiral Hybrid Perovskites
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Min Jae Kwon (Hanyang University)
Co-Author(s)
Abstract
Hybrid organic-inorganic perovskites (HOIPs) allow the incorporation of diverse organic components owing to their high structural flexibility. In particular, the use of chiral organic components can induce structural asymmetry in the inorganic framework, leading to distinct chiroptical properties. In this work, a series of π-extended thiophene-based organic ligands with different terminal groups (H, Cl, Br, and I) was synthesized to explore the role of the thiophene π-spacer and investigate the effect of halogen substitution on the chiroptical and optoelectronic properties of chiral HOIPs. Structural analysis showed that larger halogen substituents promoted deeper NH3+ penetration into the inorganic framework and strengthened hydrogen bonding, thereby facilitating chirality transfer from organic to inorganic layer. Notably, the [(S)-TI]2PbI4 film achieved the highest gCD value of 9.4 x 10-3, which surpasses previously reported values for methylbenzylamine (MBA)-based HOIPs. The fabricated photodetectors further demonstrated the applicability of these newly designed chiral ligands by exhibiting low dark current and clear circularly polarized light discrimination. These findings provide valuable insight into how π-extended thiophene-based ligands with varied halogen substituents control chirality transfer and chiroptical behavior in HOIPs.
