报告题目：Chiral hybrid inorganic-organic perovskites: a promising platform towards chiroptics and spintronics

报 告 人： 龙官奎

　　　　　新加坡南洋理工大学

报告时间：2019年4月26日（星期五）上午9:30

报告地点：必赢电子游戏网站中心校区唐敖庆楼9楼会议室

报告人简介：

2018年2月至今，新加坡南洋理工大学，博士后
2016年9月-2018年2月，加拿大多伦多大学，博士后
2014年11月-2016年8月，天津化学化工协同创新中心，博士后
2009年9月-2014年6月，南开大学，理学博士
2005年9月-2009年6月，兰州大学，理学学士

主要研究方向：手性钙钛矿材料，有机太阳能电池和理论计算

报告简介：

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.

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