Title：Chiral hybrid inorganic-organic perovskites: a promising platform towards chiroptics and spintronics

Speaker： Guankui Long Nanyang Technological University, Singapore

Time：April 26, 2019 (Friday) at 9:30 am

Venue： Conference Room on 9th Floor, Tang Aoqing Building, Central Campus

Research interests：Chiral Perovskite Materials，Organic solar cells and theoretical calculations

Abstract：

Hybrid organic-inorganic perovskites exhibit strong spin-orbit coupling, spin-dependent optical selection rules and large Rashba splitting. These characteristics make them promising candidates for spintronic devices with photonic interfaces. Here we report that spin polarization in perovskites can be controlled through chemical design as well as by a magnetic field. We obtain both spin-polarized photon absorption and spin-polarized photoluminescence in reduced-dimensional chiral perovskites through combined strategies of chirality transfer and energy funneling. Recently, we have further demonstrated 3D chiral hybrid organic-inorganic perovskites that implant chirality through introducing the chiral methylammonium cation. Based on structural optimization, phonon spectra, formation energy, and ab initio molecular dynamics simulations, it is found that the chirality of the chiral cations can be successfully transferred to the framework of 3D HOIPs, and the resulting 3D chiral HOIPs are both kinetically and thermodynamically stable. Combining chirality with the impressive optical, electrical, and spintronic properties of 3D perovskites, 3D chiral perovskites is of great interest in the fields of piezoelectricity, pyroelectricity, ferroelectricity, topological quantum engineering, circularly polarized optoelectronics, and spintronics.